VICTOR Pressure Regulators Troubleshooting instruction

PARTS, SERVICE
& REPAIR BULLETIN

ESS3
ESS4
ESS7
EST4
ESL4
ELC4

Pressure Regulators

Issue Date: March 2011Revision: D Form No.: 0056-1966

INDEX

Section Models

1

2

3

ESS3 & ESS4

Future EDGE Models

ESS7, EST4, ESL4 & ELC4

Page

01

--

15

4

5

Future EDGE Models

Future EDGE Models

- i -

--

--

SECTION 1

SERVICE & REPAIR INSTRUCTIONS

ESS3 & ESS4 Single Stage EDGE™ Series Regulators

 WARNING! 

Apparatus improperly operated, maintained or repaired can be dangerous!

Service and repair of VICTOR apparatus should only be performed by a Qualified Repair
Technician. The term “Qualified Repair Technician” refers to repair personnel capable
of servicing apparatus in strict accordance with all applicable Victor “Parts & Service
Bulletins” and literature. Improper service or repair, or modification of the product,
could result in damage to the product or injury to the operator.

Protect your investment! Some parts and accessories manufactured by others may fit

VICTOR apparatus, but not conform to VICTOR’s exacting standards for quality, fit and

function. For your own protection and the protection of your investment, specify and
use only
level of performance, safety and reliability that you expect from

VICTOR genuine parts and accessories. It’s the only way to guarantee the

VICTOR.

GLOSSARY – COMMONLY USED TERMS

OUTLET PRESSURE: The pressure measured at the Regulator’s outlet port.
INLET PRESSURE: The pressure measured immediately at the Regulator’s entry.
DROP: A change in outlet pressure from a no-flow to flowing condition while the inlet

pressure remains constant.

RISE: An increase in outlet pressure as the inlet pressure decreases.
CREEP: A gradual increase in outlet pressure.

RECOMMENDED TOOLS & SUPPLIES FOR REPAIR PROCEDURES

• Inlet Swivel Assembly Plug

1

/2”, 5/8”, 9/16”, 11/16” and 3/4” Sockets

•

• Socket Wrench

• Torque Wrench

7

•

/16”, 3/4” and 13/16” Open End Wrenches

• 1/8”, 9/64”, 3/16” and 1/4” Hex Keys

• Bench Vise

1

• Repair Tool RT-180 (8” Leverage Bar with

• Oxygen-compatible Teflon® Tape

• Loctite® #222 Threadlocker

• CHRISTO-LUBE® #129 Lubricant.

/4-18 NPT [M] End)

ESS3/ESS4

- 1 -

SECTION 1

(c)

Orientation

Back-Up Ring

Diaphragm

(c)

Bonnet

In Assembly

GUIDE BUSHING

Body

WASHER

Assembly

SCREW

11

THRUST WASHER

12

DRIVE SCREW

13

14

7

6

KNOB DECAL

SCREW

8A

LOCK WASHER

8

WASHER

15

ADJUSTING SPRING

BONNET

7

(a)

BONNET SCREWS

10

2

KNOB

9

VENTED CAP

SPRING BUTTON

SPRING

UPPER SEAT

27D

SEAT

27B

ADJ. SCREW

27J

27H

27I

Vented

27F

DISC

SEAT RET.

CAP NUT

CAP

27E

27C

27K

(b)

Non-Vented

27G

DETAIL A - Relief Valve

BACK-UP RING

4A

DIAPHRAGM ASSM.

4

NOZZLE

O-RING

SEAT ASSM.

19

VALVE SPRING

16

17

18

GLAND

FRICTION DAMPER

SEAT GUIDE

20

21

22

BODY

27A

25

PIPE PLUG

1

BODY

OUTLET

26

(b)

RELIEF VALVE

31

REAR BODY DECAL (GAS I.D.)

23

INELT NUT

27

30

BONNET DECAL (GAS)

(See Detail A)

24

INLET SWIVEL

3

GAUGE GUARD

FILTER

29

H.P. GAUGE

EXPLODED VIEW - ESS3 AND ESS4 MODELS

L.P. GAUGE

28

ESS3/ESS4 SECTION 1

24A

- 2 -

SCREW

5

SCREW

5

ESS3 models use five Screws for Bonnet, ESS4 models use six Screws.
(a)

(b) Pipe Plug replaces Relief Valve on fuel gas models (510, 300, 993).

(c) Used on ESS4 “E” Range (200 PSIG Delivery) models only.

3.23

ESS3 Model

(ESS3-125-540 Shown)

2.18

OUTLET

RELIEF

3.82

ESS4 Model

(ESS4-125-540 Shown)

OUTLET

RELIEF

2.55

5.69

1400-0239

1406-0215

1406-0050

INLET

TABLE 1

TABLE 2

TABLE 2

1406-0220

1400-0246

1406-0006

0750-0201

0750-0203

1407-0282

TABLE 2

0762-0006

0708-0018

1408-0033

0708-0003

5.88

INLET

TABLE 2

TABLE 2

TABLE 3

TABLE 2

TABLE 2

1105-0014

0717-0003 (a)

TABLE 1

TABLE 2

TABLE 1

ESS3 ESS4

Description Part No. Part No. Qty.

Body 0701-0705 0701-0706 12Bonnet 0720-0343 0720-0342 13Gauge Guard 1429-0071 1429-0070 14Diaphragm Assembly 0730-0024 TABLE 1 14ABack-Up Ring --- TABLE 1 15Screw (Gauge Guard) 1400-0248 1400-0239 26Decal, Knob 1415-0788 1415-0791 17Screw 28Washer 19Knob 110Socket Head Cap Screw (b)11Thrust Washer 112Drive Screw 113Guide Bushing Assm. 114Washer, Special 115Adjusting Spring 116Nozzle 117O-Ring (Nozzle Body) 118Seat Assembly 119Valve Spring 120Gland 121Friction Damper 122Bottom Guide 123Inlet Nut 124Inlet Swivel w/Filter 1

1

Ref.

PARTS LIST - ESS3 and ESS4 Model Regulators

No.



ESS3/ESS4 SECTION 1

Lock Washer 1

8A

- 3 -







Inlet Filter 125Pipe Plug 126Outlet Connection 127Relief Valve 128Gauge, Low Pressure 129Gauge, High Pressure 130Decal, Bonnet Gas I.D. 131Decal, Rear Body Gas Info. 1

24A









 Items most commonly required for regulator repair and recommended for stock.

(a) Cylinder models only.

(b) ESS3 uses five (5) screws, ESS4 uses six (6) screws.



All Other ModelsFlow Gauge Models

Decal, Rear

Body Gas Info.

0761-0098

1424=0513

1424=0511

Gas I.D.

Decal, Bonnet

Outlet

26 30 31

Connection

1424=0512

1424=0511

All Other ModelsHydrogen (Vented Relief Valve)

ESS3-FG-580

LP Gas

24

(w/Filter)

Inlet Swivel

--- ---

23

1424=0515

1424=0511

Inlet Nut

18

Seat Assembly

--- --- --- 0736-0002

16

Nozzle

0974-0003 0970-0015 0960-0014 1415-0805 1415-0804

0992-0003 0970-0015 0950-0068 1415-0790 1415-0792

0973-0003 0970-0015 0950-0017 (e) 1415-0799 1415-0798

0972-0015 0972-0009 0960-0014 1415-0807 1415-0806

0985-0030 0985-0058 (d) 0950-0017 (e) 1415-0801 1415-0800

0963-0015 0963-0009 0950-0080 1415-0803 1415-0802

0983-0003 0983-0005 0960-0029 1415-0809 1415-0808

0740-0131

0740-0131

0740-0131

0740-0131

0740-0131

0740-0131

0740-0131

0740-0101

0702-0068

0740-0101

0740-0101

0740-0101

0702-0068

0702-0068

0702-0068

0600-0005 0600-0014 0600-0018

--- --- --- ---

--- --- --- ---

60 200 400 30 60 200 400

0601-0006 0601-0006 0601-0006 0601-0004 0601-0004 0601-0004 0601-0006

0600-0060 0600-0066 0600-0071 0600-0003

0606-0005 0606-0005 0606-0005 --- --- --- ---

LP Gas

ESS3-40-510LP ESS4-40-510LP ESS4-125-510LP

1424=0515

1424=0513

---

9

Adjusting Knob (w/Decal)

0790-0214 0790-0208 0702-0085 0702-0068 0740-0158

0790-0214 0790-0208 0702-0085 0702-0068 0740-0158

0790-0219 0790-0216 0702-0085 0702-0068 0740-0158

0790-0212 0790-0206 0702-0085 0702-0068 0740-0158

LP Gas

All Models

---

---

Pipe Plug

1105-0014

Ref. No. 

---

Acetylene

All Models

GREY

BLACK

BLACK

Acetylene

ESS3-15-510 ESS4-15-510

Description ESS3-FG-320 ESS3-40- ESS4-40- ESS3-125- ESS4-125- ESS3-200- ESS4-200-4Diaphragm Assembly 0730-0024 0730-0063 0730-0024 0730-0063 0730-0063 0730-0024 0730-0024 0730-0063 0730-0024 0730-0063 0730-0024 0730-00684ABack-Up Ring

Ref.

TABLE 1 - Diaphragm, Adjusting Spring & Gauges

No.

1424=0514

--- --- --- --- ---

Adjusting Spring 0761-0107 0761-0089 0761-0060 0761-0093 0761-0098 0761-0060 0761-0060 0761-0093 0761-0080 0761-009828Gauge, Low Pressure (f) 1424=0512 1424=0516

15

1424=0513

Gauge, High Pressure (f) 1424=0513 1424=0511

29

(f) To replace Lens only - Replacement Lens Part No. 1429-0029.

TABLE 2 - Inlet & Outlet, Seat Assembly & Nozzle, Color Coded Items

Gas Inlet Type I.D. Color ESS3 ESS4 ESS3 ESS4 ESS3 ESS4

Oxygen CGA 540 GREEN 0790-0209 0790-0200 0702-0085 0702-0068 0740-0158 0740-0131 0967-0044 0967-0032 0950-0068 1415-0790 1415-0792

Oxygen 992 GREEN 0790-0209 0790-0200 0702-0085 0702-0068 0740-0158

ESS3/ESS4 SECTION 1

YELLOW

Argon/Helium/Nitrogen CGA 580

Air (Industrial) CGA 590

Air (Breathing) CGA 346

Carbon Dioxide CGA 320 (d)

Nitrous Oxide CGA 326 BLUE 0790-0211 0790-0205 0702-0085 0702-0068 0740-0158

Hydrogen & Methane CGA 350 RED 0790-0210 0790-0204 0702-0085 0702-0068 0740-0158

Acetylene CGA 510 RED 0790-0210 0790-0204 0970-0003 0970-0015 0960-0029 1415-0789 1415-0793

Acetylene CGA 300 RED 0790-0210 0790-0204 0968-0003 0968-0005 0960-0029 1415-0789 1415-0793

Acetylene 993 RED 0790-0210 0790-0204 0993-0003 0970-0015 0960-0029 1415-0789 1415-0793

LP Gases CGA 510 ORANGE 0790-0213 0790-0207 0970-0003 0970-0015 0960-0029 1415-0797 1415-0796

TABLE 3 - Relief Valve

(d) CGA 320 inlet requires inlet washer part number 1408-0065.

(e) Flow Gauge (FG) models must use Outlet Connection with orifice - Part No. 0950-0120.

- 4 -

Ref.



Relief Valve Nominal Set Pressure

Description 40 psi Delivery 125 psi Delivery 200 psi Delivery 15 psi Delivery 40 psi Delivery 125 psi Delivery 200 psi Delivery

No.

Pipe Plug

Relief Valve Complete Assembly

27

---

1105-0014

or Pipe Plug

Body

27A

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

---

Seat 0608-0006 0608-0006 0608-0009 0608-0006 0608-0006 0608-0006 0608-0009

Seat Retainer 0609-0006 0609-0006 0609-0006 0609-0003 0609-0003 0609-0003 0609-0006

Upper Seat 0608-0023 0608-0023 0608-0021 0608-0018 0608-0018 0608-0018 0608-0023

Disc 1406-0017 1406-0017 1406-0017 1406-0016 1406-0016 1406-0016 1406-0017

Spring 0610-0016 0610-0016 0610-0014 0610-0004 0610-0005 0610-0008 0610-0013

Cap --- --- --- 0614-0004 0614-0004 0614-0004 0614-0006

Cap (Vented) 0614-0016 0614-0016 0614-0016 --- --- --- ---

Spring Button

Adjusting Screw 1401-0007 1401-0008 1401-0008

Cap Nut 1403-0024 1403-0024 1403-0024

27B

27C

27D

27E

27F

27G

27H

27I

27J

27K



SERVICE & REPAIR PROCEDURES

ESS3 & ESS4 Single Stage EDGE™ Series Regulators

DISASSEMBLY PROCEDURES

Refer to the exploded view for reference numbers [Shown in brackets]

1. Mount the Inlet Swivel Assembly Plug in the Bench Vise and firmly attach the Regulator.

2. Remove the Knob Decal [6], and remove the #10-32 Screw [7], Lock Washer [8A] and
Washer [8] located inside the Knob [9]. The Knob can now be removed.

3. Remove the 5 (for ESS3) or 6 (for ESS4) Socket Head Cap Screws [10]. The Bonnet [2]
can now be removed.

TIP: Be careful when removing the Bonnet, as the Diaphragm Assembly can
sometimes stick to it when disassembling.

4. Remove the Drive Screw [12], Guide Bushing [13], and Thrust Washer [11]. The Guide
Bushing can be separated from the Drive Screw by removing the #10-32 Screw [7] and
Washer [14] installed in the bottom of the Drive Screw.

TIP: Make sure you’ve got the Thrust Washer. If it’s not sitting on top of the Drive
Screw, it may still be up inside the Bonnet.

5. Remove the Adjusting Spring [15], Diaphragm Assembly [4], and Back-Up Ring [4A] (if
so equipped), and then remove the Nozzle [16] from the Body.

6. Remove the Seat Assembly [18], Valve Spring [19], Gland [20], Friction Damper [21]
and Bottom Guide [22] from the Body.

7. Remo ve the Relief Valve or Pipe Plug [27], Outlet Connection [26] and Pipe Plug [25] (if
necessary) from the Body.

8. Screw the Leverage Bar Tool RT-180 into the outlet port of the Body (lightly hand tight),
and use the bar to unscrew the Body off the Inlet Swivel [24].

TIP: Watch the Inlet Swivel while trying to turn the Body. If the Swivel is turning with
the Body, then you need to tighten the Inlet Nut tighter on the Inlet Swivel Assembly
Plug.

9. Holding the Body by hand, or lightly in the Bench Vise (with the top surface of the body
protected from damage), remove the Gauge Guard [3] (held on by two screws [5]) and
then remove the Gauges [28, 29].

TIP: Step 9 can be done before Step 8 if desired, but it’s usually easier to remove the
Gauge Guard and Gauges with the Inlet Swivel Assembly Plug out of the way.

NOTE ON ESS4 MODELS: The lower Gauge Guard Screw cannot be accessed until
the Relief Valve has been removed (if so equipped). Subsequently, the Gauge Guard
(and Gauges) must be installed into the Body prior to installing the Relief Valve.

10. If necessary, disassemble the Relief Valve as shown in DETAIL A.

 CAUTION! Discard the used Nozzle O-Ring, Inlet Filter, Diaphragm Assembly,

Seat Assembly and Friction Damper. Replace them with new parts each time you
assemble a Regulator.

ESS3/ESS4

- 5 -

SECTION 1

All of these recommended components are available together in convenient repair kits for
your ESS3 or ESS4 model Regulator:

Repair Kit Part No. Description

RK-ESS3-HP 0790-0162 ESS3 Repair Kit for Oxygen, Inert Gases, Air, CO

N

O, Hydrogen.

2

,

2

RK-ESS4-HP 0790-0163 ESS4 Repair Kit for Oxygen, Inert Gases, Air, CO2,

N

O, Hydrogen.

2

RK-ESS4-HP200 0790-0164 ESS4 Repair Kit - 200 PSIG Delivery Models Only -

for Oxygen, Inert Gases, Air, CO

, N2O, Hydrogen.

2

RK-ESS3-F 0790-0165 ESS3 Repair Kit for Acetylene, LP Gas.
RK-ESS4-F 0790-0166 ESS4 Repair Kit for Acetylene, LP Gas.

CLEANING PARTS

It is recommended to clean all metal parts for oxygen service, regardless of Regulator Model
being repaired. There are several ways to clean components for oxygen service; the
following standards are recommended reading for more detailed information on methods and
processes:

• CGA G-4.1 “Cleaning Equipment for Oxygen Service”

• ASTM G-93 “Standard Practice for Cleaning Methods and Cleanliness Levels for

Material and Equipment Used in Oxygen-Enriched Environments”

• ASTM G-127 “Standard Guide for the Selection of Cleaning Agents for Oxygen

Systems”

For metal parts, Victor brand suggests using CCI Envirospray Liquid, used per the
manufacturer's instructions, followed by a hot water rinse and thorough drying. Additional
information can be found at

http://www.ccichemical.com.

DO NOT allow non-metal parts to come in contact with cleaning solvents. Cleaning solvents
can cause non-metal parts to swell and/or crack. To clean these parts, use a non-petroleum
based mild soap solution, followed by a thorough rinsing in water. Dry parts completely prior
to reassembling.

ASSEMBLY PROCEDURES

Refer to the exploded view for reference numbers [Shown in brackets]

 IMPORTANT NOTES ABOUT SEALING PIPE THREADS:

• When using Teflon® tape where noted: Apply two to three layers around the

threads, leaving the first thread clean. Insure your Teflon® tape is oxygen­compatible.

• When using Loctite® #222 Threadlocker where noted: Apply two to three drops

to the second and third thread, leaving the first thread clean.

ESS3/ESS4

- 6 -

SECTION 1

1. Wrap the Low and High Pressure Gauges [28, 29] with Teflon® tape.

2. Holding the Body [1] by hand, or lightly in the Bench Vise (with the top surface of the
Body protected from damage), install the Gauges into the Body and torque each to 10 ft­lbs minimum. Then install the Gauge Guard [3] using the two mounting Screws [5],
tightening them until snug (the Gauge Guard firmly held in position).

TIP: If you cannot get a torque wrench on the Gauges, some simple rules will help
insure adequate tightness: When the Gauges are tight, nearly all of the

1

/8-27 NPT
Gauge threads will disappear into the Body. You should only see one to two turns of
complete thread remaining. Additionally, when the Gauge Guard is in position, the
face of each Gauge should be at least
Guard. If the Gauges are closer to the Gauge Guard than that, tighten the Gauges
tighter as needed (one full revolution of the
Gauge closer to the Body by approximately

1

/32” away from the underside of the Gauge

1

/8-27 NPT Gauge thread will move the

1

/32”). Be sure to note the orientation of

the Gauge face – always go tighter to line up Gauge dial artwork.

3. Install the new Filter [24A] into the Inlet Swivel [24], and apply either Teflon® tape or
Loctite® #222 to the Inlet Swivel threads.

4. If not already in place, mount the Inlet Swivel Assembly Plug back in the Bench Vise.
Firmly attach the Inlet Swivel and Inlet Nut [23] onto the Inlet Swivel Assembly Plug.

5. Screw the Body onto the Inlet Swivel, screw the Leverage Bar Tool RT-180 into the outlet
port of the Body (light hand tight), and then use the Leverage Bar to tighten the Body
onto the Inlet Connection. At this point, tighten enough so that the body cannot be turned
by hand without the assistance of the Leverage Bar. Final torque for the Inlet Connection
will occur in upcoming STEP 10.

6. Apply either Teflon® tape or Loctite® #222 to the Pipe Plug [25] threads. Install the Pipe
Plug into the rear Body high pressure port, and torque to 15 ft-lbs.

7. Preassemble the Relief Valve (if so equipped): Assemble (or reassemble) the Relief
Valve [27] as shown in DETAIL A. Use no lubricants or sealants. If your Regulator
model has a Pipe Plug instead of a Relief Valve, or if your Relief Valve is already
assembled and tested, you can skip to STEP 10.

8. To ensure proper Relief Valve performance, perform the following test procedures before
assembling the Relief Valve in the Regulator.

a. Attach the Relief Valve to a 450 PSIG source of oil-free air or dry nitrogen.
b. Slowly pressurize the Relief Valve, increasing to the recommended blow-off pressure

listed below. Note that

VICTOR Relief Valves are stamped with their nominal set

pressure, in case you’re unsure which Relief Valve you have.

Non-Vented Relief Valves:

If the Relief Valve vents before the minimum blow-off pressure is reached, then a
second Disc [27E] may be added.

If it still vents, then the Spring [27F] must be replaced.

Vented Relief Valves:

If the Vented Relief Valve fails to vent within the recommended blow-off pressure,
reset the Adjusting Screw [27J] as necessary and perform this step again. Make
sure you fully bleed off all pressure each time you test for blow-off pressure.

ESS3/ESS4

- 7 -

SECTION 1

Regulator Max.
Delivery Pressure

15 PSIG 30 PSIG 27 to 33 PSIG
40 PSIG 60 PSIG 55 to 66 PSIG
125 PSIG 200 PSIG 180 to 220 PSIG
200 PSIG 400 PSIG 360 to 440 PSIG

9. When all testing is completed, bleed pressure off the Relief Valve. Install the Cap Nut

[27K] on the Vented Relief Valve.

10. Apply either Teflon® tape or Loctite® #222 to the Relief Valve (or Pipe Plug) [27]
threads. Install the Relief Valve (or Pipe Plug) into the Body and torque to 15 ft-lbs.

11. Apply only Loctite® #222 threadlocker to the Outlet Connection [26] threads. Install the
Outlet Connection into the Body and torque to 15 ft-lbs.

12. At this point, thoroughly blow out the Body assembly with pressurized oil-free air or dry
nitrogen to insure it is completely free of chips and debris.

13. Install the Bottom Guide [22] into the Body – it should slip in freely. Note its orientation
when installing – the cupped end with the hex on it should face up.

14. Preassemble the seat components: Push the Friction Damper [21] into the Gland [20],
and then slip the Valve Spring [19], Gland and Friction Damper onto the shaft of the Seat
Assembly [18].

TIP: The Friction Damper should have enough tension to hold the Gland and the
Valve Spring in position on the shaft of the Seat Assembly. If there appears to be no
tension (if the parts just seem to want to fall off), then there may be a problem with
your Friction Damper, or the Friction Damper may not be firmly pushed up in place
inside the Gland.

Then install the preassembled seat components into the Regulator Body – with the
Friction Damper and Gland fitting down into the cup shape of the Bottom Guide.

Mating Relief
Valve (Nominal)

Recommended
Blow-off Pressure

15. Install the new O-Ring [17] onto the Nozzle [16], taking care to guide it carefully over the
Nozzle threads to avoid nicks or tears. DO NOT use lubricant on the O-Ring. Install the
Nozzle/O-Ring into the Regulator Body and torque to 15 ft-lbs. Note that 15 ft-lbs is the
same recommended torque for the Inlet Connection Swivel, so as you torque down the
Nozzle, you’re also finish-tightening the Inlet Swivel to the correct torque value.

TIP: Watch the Inlet Swivel while you torque down the Nozzle. If the Swivel is turning
with the Body, then you need to tighten the Inlet Nut tighter on the Inlet Swivel

Assembly Plug. You want to be sure that the 15 ft-lbs torque is being applied to both
the Nozzle threads and the Inlet Swivel threads.

16. Preassemble the Adjusting Mechanism: Apply CHRISTO-LUBE® #129 Lubricant to
the entire length of the threads of the Drive Screw [12], and screw the Guide Bushing

[13] onto the Drive Screw (by hand) all the way up until it stops (do not over tighten!).

Note that this is a left hand thread. Next, apply only Loctite® #222 to the threads of the
#10-32 Screw [7], and install the Screw and Washer [14] into the Drive Screw –
tightening until snug.

TIP: Make sure you’ve got the Drive Screw oriented correctly – the Screw and
Washer you just installed should be in the end that’s opposite the square flats.

17. Install the Diaphragm Assembly [4], Adjusting Spring [15], preassembled Adjusting
Mechanism and Thrust Washer [11] onto the Regulator Body. Note that the Diaphragm

ESS3/ESS4

- 8 -

SECTION 1

centers itself in a recessed pocket in the top of the Body. Don’t forget the Thrust
Washer! Regulator function will be impaired without it.

18. Install the Bonnet [2] onto the Body. Take care while slipping the Bonnet down over the
internal components – the ribs inside the Bonnet must slide into the scallops of the Guide
Bushing.

TIP: If your Bonnet still has the Gas I.D. decal on it, make sure you get the Bonnet
oriented correctly with the Gas I.D. decal facing front.

19. Install the five (for ESS3) or six (for ESS4) Socket Head Cap Screws [10] into the
Bonnet. Tighten all bolts until snug, then torque each to 12-15 ft-lbs in the sequence
shown in FIGURE 1.

FIGURE 1 - Torque Sequence for Bonnet Screws

20. Apply a small amount of CHRISTO-LUBE® #129 to the top surface of the Bonnet (the
surface around the square of the Drive Screw), then slip the Knob [9] into position – with
the square hole inside the knob mating to the square shaft of the Drive Screw.

21. Install the #10-32 Screw [7], Lock Washer [8A] and Washer [8] to hold the Knob on.
Torque this Screw a minimum of 30 in-lbs.

22. Apply new Knob or Gas I.D. decals [6, 30, 31] as needed to insure the Regulator
maintains clear visual identification.

TIP: If you’re replacing the rear Body Gas I.D. decal, make sure you don’t cover up
the model number stamped on the Body. The Gas I.D. decal should be positioned
right next to the stamping, with the arrow on the decal pointing to the stamped model
number.

23. Disconnect the Regulator from the Inlet Swivel Assembly Plug. The Regulator is now
ready to test.

RECOMMENDED TOOLS AND SUPPLIES FOR TEST PROCEDURES

• Test Gun (quick opening on/off valve) with #52 (.0635”) restricting orifice

• Source of oil-free air or dry nitrogen

ESS3/ESS4

- 9 -

SECTION 1

TEST PROCEDURES

 WARNING! 

For your safety, and the safety of others:

• Always test with oil-free air or dry nitrogen only.

• Always wear eye protection while testing a Regulator.

• Always perform all of the following test procedures after reassembling a Regulator.

1. Adjust the Test Manifold to the proper pressure shown in TABLE 4.

Gas Service Manifold Pressure for Testing

Acetylene & LP Gas 250±20 PSIG
CO2 & N2O 100±100 PSIG
Air, Argon, Hydrogen, Helium, Nitrogen,

Oxygen

TABLE 4 – Edge™ Regulator Test Pressures

2. Attach the Regulator to the Manifold connection or test adapter. Start the nut by hand
(do not force), and tighten securely with a wrench to create a seal.

3. Turn the Regulator Adjusting Knob clockwise two or three times until you feel slight
tension being applied to the Adjusting Spring.

2000±100 PSIG

4. Slowly open and close the Manifold Valve two or three times to remove contamination
that may cause malfunctions. Leave the Manifold Valve closed.

a. If no flow comes through the Regulator, determine the cause – refer to the

TROUBLESHOOTING CHART at the end of this section.

5. Turn the Adjusting Knob counterclockwise until it stops, and attach the Test Gun (with a
#52 restricting orifice) to the outlet of the Regulator.

6. Open the Test Manifold Valve and close the Test Gun.
a. Manifold working pressure will appear on the High Pressure Gauge.
b. If the Low Pressure Gauge begins to show pressure building, turn the Test Manifold

off and refer to the TROUBLESHOOTING CHART.

7. Use the values in the following TABLE 5 for all subsequent tests:

Edge™ Model
ESS3-15-

ESS4-15­ESS3-40-

ESS4-40­ESS3-125-

ESS4-125­ESS3-200-

ESS4-200-

A
Pressure Set
for Leak Test

15 PSIG 5 PSIG 3 PSIG 1 PSIG

40 PSIG 10 PSIG 3 PSIG 1 PSIG

125 PSIG 20 PSIG 4 PSIG 1 PSIG

200 PSIG 50 PSIG 5 PSIG 1 PSIG

Pressure Set for

Creep/Drop Test

B

C

Drop

Allowance

D

Initial Shut-off

Allowance

ESS3/ESS4

TABLE 5 – Edge™ Regulator Test Values

- 10 -

SECTION 1

8. LEAK TEST
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver A PSIG.
b. Close the Manifold Valve and turn the Adjusting Knob one turn counterclockwise.
c. Observe the Low Pressure and High Pressure Gauges for five (5) minutes:

1. If the High Pressure Gauge reading drops, there is a leak in the Cylinder Valve,
Inlet Connection, High Pressure Gauge or the rear plugged high pressure port.

2. If the Low Pressure Gauge reading drops, there is a leak in the downstream
equipment, Low Pressure Gauge, Outlet Connection or Relief Valve port.

3. If the High Pressure Gauge reading drops at the same time the Low Pressure
Gauge reading increases, there is a leak in the Regulator Seat.

d. If any leaks are found, isolate if possible using a liquid leak detector, disassemble and

repair or replace parts as needed, and start the test over again. Refer to
TROUBLESHOOTING CHART for more detailed cause and possible corrective
action information.

9. DROP TEST
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver B PSIG.

b. Open the Test Gun and note the new indicated delivery pressure. Drop (indicated

pressure static minus indicated pressure flowing) must not exceed C PSIG.

10. CREEP TEST / SLOW SHUT-OFF TEST
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver B PSIG.

b. Open and close the Test Gun several times to stabilize the Regulator. Leave the test

gun closed.

c. Observe the Low Pressure Gauge for five (5) minutes:

1. During the first minute, an initial shut-off increase of D PSIG is permissible.

2. During the next 4 minutes, no further increase (creep) is allowed.

11. Close the Manifold Valve and release all pressure from the Regulator by opening the
Test Gun. Turn the Adjusting Knob counterclockwise until it stops.

12. Remove the Test Gun from the Regulator.

13. Remove the Regulator from the Test Manifold. The Regulator is now ready to use.

ESS3/ESS4

- 11 -

SECTION 1

TROUBLESHOOTING

CAUSES POSSIBLE CORRECTIVE ACTIONS

1. No gas flows through the Regulator and the High Pressure Gauge does not
indicate pressure.

a. Inlet or Inlet Filter is plugged. Blow 40-45 PSIG of air through the Filter in

reverse direction of the normal gas flow.

b. Empty Supply Cylinder. Replace the Cylinder.

2. No gas flows through the Regulator and the High Pressure Gauge does indicate
pressure.

a. Damaged Adjusting Mechanism or

missing components.

b. Adjusting Knob not installed

correctly.

c. Outlet Connection plugged. Inspect and clear the Outlet Connection of

d. Broken Adjusting Spring. Replace the Adjusting Spring.
e. Broken Seat Stem. Replace the Seat Assembly.

Check the Drive Screw, Guide Bushing and
Thrust Washer – insure they are installed
correctly and moving freely in the Bonnet.

Make sure the square of the Drive Screw is
properly mated into the square in the
Adjusting Knob.

any debris.

3. Gauges do not indicate pressure but gas flows through the Regulator.

a. Defective Gauge(s). Replace Gauge(s).

4. Regulator does not deliver in its designed delivery pressure range.

a. Incorrect Adjusting Spring used

during repair.

b. Damaged Adjusting Mechanism or

missing components.

5. Regulator hums or clatters while flowing.

a. Missing Friction Damper. Install a Friction Damper.
b. Missing Bottom Guide. Install the Bottom Guide.
c. Flow exceeds Regulator capacity. Reduce flow to below the maximum rating of

d. Restriction upstream of the

Regulator.

Replace with correct Adjusting Spring.

Check the Drive Screw, Guide Bushing and
Thrust Washer – insure they are installed
correctly and moving freely in the Bonnet.

the Regulator.
Inspect system and remove restriction.

ESS3/ESS4

- 12 -

SECTION 1

CAUSES POSSIBLE CORRECTIVE ACTIONS

6. Regulator experiences excessive drop.

a. Friction Damper too tight. Replace the Friction Damper and/or Gland.
b. Wrong size orifice in Test Gun. Insure the correct orifice is installed in the

Test Gun - size #52 (.0635”).
c. Partially plugged Inlet Filter. Clean or replace the Inlet Filter.
d. Incorrect Adjusting Spring used

during repair.

e. Low Cylinder pressure or Manifold

test pressure.

f. Flow exceeds Regulator capacity. Reduce flow to below the maximum rating of

7. Increase in the low pressure gauge reading (creep).

a. Loose Nozzle. Tighten Nozzle to 20 ft-lbs torque.
b. Missing or damaged Nozzle O-Ring. Inspect and install or replace O-Ring as

c. Accumulation of foreign particles on

Seat Assembly or seating surfaces.

Replace with correct Adjusting Spring.

Check Cylinder and Manifold pressure and

adjust/replace as needed.

the Regulator.

necessary.

Clean seating surfaces and/or replace Seat

Assembly.

8. With the cylinder valve closed, the High Pressure Gauge indicator drops, and
there is no immediate increase in pressure indicated on the Low Pressure Gauge.

a. Loose connection – Regulator to

Test Manifold.

b. Loose connection – Inlet Swivel to

Regulator Body.

c. Loose connection – High Pressure

Gauge to Regulator Body.

d. Loose connection – Rear Pipe Plug. Tighten Pipe Plug using 15 ft-lbs torque

e. Leaking Gauge. Replace the Gauge.

9. Low Pressure Gauge indicator slowly drops, and there is no decrease in pressure
on the High Pressure gauge when the Manifold Valve is closed.

a. Test Gun is not attached securely. Tighten the Test Gun.
b. Loose connections at the Regulator

Body – Outlet Connection, L.P.
Gauge or Relief Valve/Plug

c. Loose connection – Bonnet to Body. Tighten Bonnet Screws using 12-15 ft-lbs.

d. Damaged Diaphragm. Replace Diaphragm Assembly.

Insure Regulator is securely tightened to the
Manifold.

Tighten the Swivel using 20 ft-lbs torque.

Tighten the High Pressure Gauge using 10 ft­lbs torque minimum (See STEP 2 of the
Assembly Procedure).

minimum.

Tighten connections using 15 ft-lbs torque
minimum.

Follow the sequence shown in STEP 19
FIGURE 1 of the Assembly Procedure.

ESS3/ESS4

- 13 -

SECTION 1

CAUSES POSSIBLE CORRECTIVE ACTIONS

10. Rapid pressure drop on both High and Low Pressure Gauges.

a. Loose connection – Bonnet to

Body.

b. Loose connection – Regulator to

Test Manifold.

11. Rapid increase in Low Pressure Gauge reading.

a. Damaged or loose Nozzle. Replace and/or tighten the Nozzle to 20 ft-lbs

b. Heavy accumulation of foreign

particles on Seat Assembly or
seating surfaces.

c. Missing or damaged Nozzle O-

Ring.

d. Improper Adjusting Spring (spring

too long).

Tighten Bonnet Screws using 12-15 ft-lbs.
Follow the sequence shown in STEP 19
FIGURE 1 of the Assembly Procedure.

Insure Regulator is securely tightened to the
Manifold.

torque.
Clean seating surfaces and/or replace Seat

Assembly.

Inspect and install or replace O-Ring as
necessary.

Replace Adjusting Spring.

12. Relief Valve opens at a greater or less than marked pressure (outside a pressure
tolerance of ±15% of the marked pressure).

a. Incorrect Spring used. Replace with correct Spring.
b. Relief Valve not set properly. Repeat Relief Valve assembly/test procedure

STEP 8.

ESS3/ESS4

- 14 -

SECTION 1

SECTION 3

SERVICE & REPAIR INSTRUCTIONS

ESS7, EST4, ESL4 & ELC4 Single Stage EDGE™ Series Regulators

 WARNING! 

Apparatus improperly operated, maintained or repaired can be dangerous!

Service and repair of VICTOR apparatus should only be performed by a Qualified Repair
Technician. The term “Qualified Repair Technician” refers to repair personnel capable
of servicing apparatus in strict accordance with all applicable Victor “Parts & Service
Bulletins” and literature. Improper service or repair, or modification of the product,
could result in damage to the product or injury to the operator.

Protect your investment! Some parts and accessories manufactured by others may fit

VICTOR apparatus, but not conform to VICTOR’s exacting standards for quality, fit and

function. For your own protection and the protection of your investment, specify and
use only
level of performance, safety and reliability that you expect from

VICTOR genuine parts and accessories. It’s the only way to guarantee the

VICTOR.

GLOSSARY – COMMONLY USED TERMS

OUTLET PRESSURE: The pressure measured at the Regulator’s outlet port.
INLET PRESSURE: The pressure measured immediately at the Regulator’s entry.
DROP: A change in outlet pressure from a no-flow to flowing condition while the inlet

pressure remains constant.

RISE: An increase in outlet pressure as the inlet pressure decreases.
CREEP: A gradual increase in outlet pressure.

RECOMMENDED TOOLS & SUPPLIES FOR REPAIR PROCEDURES

• Inlet Swivel Assembly Plug

1

•

/2”, 5/8”, 9/16”, 11/16” and 7/8” Sockets and Socket Wrench

• Torque Wrench

9

/16” and 1” Open End Wrenches

•

1

/8”, 3/16” and 1/4” Hex Keys/Drivers

•

• Flat Bottom Punch Set

• Small, Long Shank Screwdriver

• Bench Vise

• Repair Tool RT-180 (8” Leverage Bar with

• Oxygen-compatible Teflon® Tape

• Loctite® #222 Threadlocker

• CHRISTO-LUBE® #129 Lubricant.

1

/4-18 NPT [M] End)

ESS7/EST4/ESL4/ELC4

- 15 -

SECTION 3

L.P. GAUGE

OUTLET

27

FRICTION DAMPER

5

GLAND

6

29

PLUG

20

SEAT GUIDE

4

VALVE SPRING

RELIEF VALVE

28

(See DETAIL A)

7

(a)

RETAINING RING

25

BODY

1

EXPLODED VIEW - ESS7 HIGH-FLOW

H.P. GAUGE

30

INFO DECAL

31

INLET SWIVEL

26

Diaphragm

Assembly

Back-Up Ring

In Assembly

Bonnet

INLET FILTER

Orientation

BACKUP RING

(b)

2A

Body

INLET NUT

24

3

(b)

SEAT ASSM.

21

NOZZLE

9

THRUST WASHER

O-RING

8

WASHER

11

SCREW

10

ADJUSTING SPRING

DIAPHRAGM ASSM.

2

22

200 PSIG DELIVERY ONLY

BONNET

15

14

GUIDE BUSHING

DRIVE SCREW

13

12

WASHER

17

SCREW

BONNET SCREWS

KNOB

23

10

DECAL

19

(a) Pipe Plug replaces Relief Valve on fuel gas models (510, 300, 993).
(b) Used on “E” Range (200 PSIG Delivery) models only.

LOCK WASHER

18

16

CAP NUT

ADJ. SCREW

28J

SPRING BUTTON

28I

Vented

SPRING

28F

UPPER SEAT

28D

SEAT

28B

DETAIL A - Relief Valve

28K

VENTED CAP

28H

CAP

28G

Non-Vented

DISC

28E

SEAT RET.

28C

BODY

28A

(a)

- 16 -

SECTION 3

EXPLODED VIEW - ESL4 / EST4 / ELC4

PLUG

20

EST4

EST4-R

ELC4

BODY

1

L.P. GAUGE

RETAINING RING

INFO DECAL

31

29

25

EST4-R
ELC4

INLET NUT

INLET FILTER

3

EST4
ESL4

INLET SWIVEL

26

24

PLUG

20

O-RING

8

NOZZLE

9

DRIVE SCREW

13

THRUST WASHER

14

DECAL

19

SCREW

10

VALVE SPRING

SEAT ASSM.

21

GUIDE BUSHING

WASHER

17

LOCK WASHER

7

WASHER

11

12

18

FRICTION DAMPER

5

SEAT GUIDE

GLAND

6

OUTLET

SCREW

10

BONNET SCREWS

16

4

EST4

EST4-R

ELC4

27

DIAPHRAGM ASSM.

ADJUSTING SPRING

22

KNOB

23

- 17 -

2

ESL4

ELC4
EST4-R

EST4

PLUG

20

DIAPHRAGM SHIM

INLET FILTER

3

EST4

EST4-R
ESL4

2B

BONNET

15

INLET NUT

24

INLET SWIVEL

26

ELC4

O-RING

2D

DIAPHRAGM ASSM.

(STAINLESS STEEL)

2C

SECTION 3

ESS7

EST4

Model Number

(All Models)

Stamping Location

Model Numbering Scheme

E XX X – XXX – XXX

Inlet Connection:

• CGA 540, 510, 024, etc.

• 250 = 1/4 NPT (F) Inlet/Outlet

• 250A = 1/4 NPT (F) Inlet/Outlet

for Acetylene

• 250F = 1/4 NPT (F) Inlet/Outlet

for H.P. Fuel Gases

• 250X = 1/4 NPT (F) Inlet/Outlet

Delivery

Pressure:

(15, 40, 125, etc.)

for Oxygen

Size:

4 = High Capacity (Large)

7 = Ultra-High Capacity (High Flow)

ESL4

ESL4 ELC4 Qty.

EST4

EST4-R

Part Numbers

1

1

---

--- ---

0736-0002

---

ELC4

E = EDGE Series

0736-0003 1

0730-0096 1

1407-0215 1

(Common Parts)

(Configuration-Specific Parts)

--- --- ---

--- --- ---

--- --- ---

Type:

SS = Single Stage,

Standard Inlet

SL = Line Regulator

ST = Station Regulator

LC = Liquid Cylinder

Regulator

Diaphragm Assm. (Stainless St.)

1 Body 0701-0697 0701-0697 0701-0696 0701-0696 1

2 Diaphragm Assembly 0730-0063 0730-0068 0730-0063

2A Backup Ring

2B Diaphragm Shim

2C

2D Diaphragm O-Ring

Ref.

PARTS LIST - ESS7, EST4, ESL4 and ELC4 Model Regulators

No. Description ESS7 ESS7-200



ESS7/EST4/ESL4/ELC4 SECTION 3

3 Filter 0717-0003 0717-0003 0717-0007 0717-0007 1

4 Seat Guide 10708-0019

5 Friction Damper 11408-0033

6 Gland 10708-0003



7 Valve Spring 10762-0006

8 O-Ring (Nozzle) 11407-0351

9 Nozzle 10702-0088



10 Screw (#10-32) 21400-0239

11 Washer (Special) 11406-0006

12 Guide Bushing 10750-0201

- 18 -

13 Drive Screw 10750-0203

Screw (1/4-20) 61400-0246

14 Thrust Washer 11406-0220

15 Bonnet 10720-0342

16

Washer 11406-0050

Lock Washer 11406-0215

17

19 Decal, Knob 11415-0791

18

21 Seat Assembly 1SEE TABLE 1

20 Pipe Plug A/R1105-0014



22 Adjusting Spring 1SEE TABLE 1

23 Knob 1SEE TABLE 1

Inlet Nut 1SEE TABLE 125Retaining Ring 1SEE TABLE 126Inlet Swivel 1SEE TABLE 1

24





27 Outlet Connection 1SEE TABLE 1

28 Relief Valve 1SEE TABLE 2



Gauge, High Pressure 1SEE TABLE 131Decal, Gas Information 1SEE TABLE 1

29 Gauge, Low Pressure 1SEE TABLE 1

30





 Items most commonly required for regulator repair and recommended for stock.

Part No.

Repair Kit

0790-0169

0790-0169

0790-0167

0790-0167

0790-0168

0790-0168

0790-0168

0790-0168

0790-0168

0790-0171

0790-0171

0790-0170

0790-0170

0790-0170

0790-0170

0790-0171

0790-0171

0790-0170

0790-0170

0790-0171

0790-0171

0790-0170

0790-0170

0790-0171

0790-0171

0790-0170

0790-0171

0790-0170

0790-0172

0790-0172

0790-0172

0790-0172

Cap

Nut

---

---

1403-0024

Decal, Gas

Information

Gauge, High

Pressure (c)

Gauge, Low

Pressure (c)

Outlet

Connection

Inlet

Swivel

Ring

Retaining

Nut

Inlet

Screw

28J 28K

Adjusting

Spring

Button

Cap

Vented

Disc Spring Cap

---

---

1401-0008

---

---

0606-0005

---

---

0614-0016

---

0614-0004

0614-0006

0610-0008

0610-0013

0610-0014

1406-0017

1406-0017

1406-0016

21 22 23 24 25 26 27 29 30 31

Ref. No. 

Knob

(w/Decal)

Spring

Adjusting

Seat

Assembly

Max

Inlet

Knob

Color

RED

BLACK

GREEN

RED

GREEN

RED

GREEN

GREEN

GREEN

GREEN

Hydrogen, Methane,

200 0740-0071 0761-0080 0790-0204 0966-0003 --- 0952-0001 0960-0029 1424=0527 --- 0707-1435

RED

RED

Natural Gas & LP Gas

GREEN

GREEN

200 0740-0071 0761-0098 0790-0204 0966-0003 --- 0952-0001 0960-0029 1424=0528 --- 0707-1435

RED

Hydrogen, Methane,

RED

Natural Gas & LP Gas

BLACK

BLACK

RED

3000 0740-0070 0761-0098 0790-0208 --- --- --- --- 1424=0528 --- 0707-1432

RED

BLACK

Air, Oxygen, CO2,

N2O & Inert Gas

RED

GREEN

BLACK

GREEN

BLACK

Upper

Seat



28 28A 28B 28C 28D 28E 28F 28G 28H 28I

Complete

Ref. No. 

Nominal

Seat

0608-0018

0608-0023

Retainer

0609-0006

0609-0003

0608-0006

0608-0009

Body Seat

0601-0004

0601-0006

Assembly

0600-0014

0600-0018

200

400

Set Pressure

0608-0021

0609-0006

0608-0009

0601-0006

0600-0071

400

(c) To replace Lens only, use Replacement Lens Part No. 1429-0028.

(Sorted by Model/Pressure/Connection)

Edge Model Gas Service

ESS7-15-510 Acetylene RED 350 0740-0071 0761-0089 0790-0204 0970-0003 --- 0970-0005 (e) 0960-0017 1424=0525 1424=0529 0707-1426

ESS7-125-510LP LP Gas ORANGE 350 0740-0071 0761-0098 0790-0207 0970-0003 --- 0970-0005 (e) 0960-0017 1424=0528 1424=0529 0707-1431

ESS7-125-540 Oxygen GREEN 3000 0740-0070 0761-0098 0790-0200 0967-0044 1406-0130 0967-0034 (e) 0950-0024 1424=0528 1424=0532 0707-1424

ESS7-125-580 Inert Gas BLACK 3000 0740-0070 0761-0098 0790-0208 0973-0003 --- 0970-0005 (e) 0950-0024 1424=0528 1424=0532 0707-1428

ESS7-200-346 Air YELLOW 3000 0740-0070 0761-0098 0790-0216 0972-0015 --- 0972-0010 (e) 0950-0024 1424=0529 1424=0532 0707-1429

ESS7-200-350 Hydrogen, Methane 3000 0740-0070 0761-0098 0790-0204 0983-0003 --- 0983-0008 (e) 0960-0017 1424=0529 1424=0532 0707-1430

ESS7-200-540 Oxygen 3000 0740-0070 0761-0098 0790-0200 0967-0044 1406-0130 0967-0034 (e) 0950-0024 1424=0529 1424=0532 0707-1424

ESS7-200-580 Inert Gas 3000 0740-0070 0761-0098 0790-0208 0973-0003 --- 0970-0005 (e) 0950-0024 1424=0529 1424=0532 0707-1428

ESS7-200-992 Oxygen 3000 0740-0070 0761-0098 0790-0200 0992-0003 --- 0970-0005 (e) 0950-0024 1424=0529 1424=0532 0707-1424

EST4-15-025 Acetylene 200 0740-0071 0761-0089 0790-0204 0966-0003 --- 0952-0001 0960-0029 1424=0525 --- 0707-1427

EST4-15-025R Acetylene 200 0740-0071 0761-0089 0790-0204 0966-0003 --- 0952-0000 0960-0029 1424=0525 --- 0707-1427

EST4-40-024 Oxygen 200 0740-0070 0761-0093 0790-0200 0965-0005 --- 0952-0001 0950-0068 1424=0526 --- 0707-1425

EST4-40-024R Oxygen 200 0740-0070 0761-0093 0790-0200 0965-0005 --- 0952-0000 0950-0068 1424=0526 --- 0707-1425

EST4-80-024 Oxygen 200 0740-0070 0761-0080 0790-0200 0965-0005 --- 0952-0001 0950-0068 1424=0527 --- 0707-1425

EST4-80-024R Oxygen 200 0740-0070 0761-0080 0790-0200 0965-0005 --- 0952-0000 0950-0068 1424=0527 --- 0707-1425

EST4-80-025

EST4-80-025R Hyd, Meth, LP Gas 200 0740-0071 0761-0080 0790-0204 0966-0003 --- 0952-0000 0960-0029 1424=0527 --- 0707-1435

EST4-125-024 Oxygen 200 0740-0070 0761-0098 0790-0200 0965-0005 --- 0952-0001 0950-0068 1424=0528 --- 0707-1425

EST4-125-024R Oxygen 200 0740-0070 0761-0098 0790-0200 0965-0005 --- 0952-0000 0950-0068 1424=0528 --- 0707-1425

EST4-125-025

EST4-125-025R Hyd, Meth, LP Gas 200 0740-0071 0761-0098 0790-0204 0966-0003 --- 0952-0000 0960-0029 1424=0528 --- 0707-1435

EST4-125-034 Inert Gas 200 0740-0070 0761-0098 0790-0208 0956-0000 --- 0952-0001 0950-0017 1424=0528 --- 0707-1434

EST4-125-034R Inert Gas 200 0740-0070 0761-0098 0790-0208 0956-0000 --- 0952-0001 0950-0017 1424=0528 --- 0707-1434

ESL4-15-250A Acetylene 350 0740-0071 0761-0089 0790-0204 --- --- --- --- 1424=0525 --- 0707-1426

ESL4-80-250F Hyd, Meth, LP Gas 350 0740-0071 0761-0080 0790-0204 --- --- --- --- 1424=0527 --- 0707-1436

ESL4-125-250X Oxygen 3000 0740-0070 0761-0098 0790-0200 --- --- --- --- 1424=0528 --- 0707-1424

ESL4-125-250F Hyd, Meth, LP Gas 350 0740-0071 0761-0098 0790-0204 --- --- --- --- 1424=0528 --- 0707-1436

ELC4-125-320 Carbon Dioxide GREY 3000 0740-0070 0761-0098 0790-0206 0985-0030 --- 0985-0003 (d) 0950-0017 1424=0528 --- 0707-1433

ELC4-125-540 Oxygen 3000 0740-0070 0761-0098 0790-0200 0967-0044 1406-0130 0967-0005 0950-0068 1424=0528 --- 0707-1424

TABLE 1 - Diaphragm, Adjusting Spring & Gauges

ESS7/EST4/ESL4/ELC4 SECTION 3

- 19 -

ESL4-125-250

ELC4-125-580 Inert Gas 3000 0740-0070 0761-0098 0790-0208 0973-0003 --- 0970-0004 0950-0017 1424=0528 --- 0707-1428

(d) CGA 320 Inlet Connection requires Inlet Seal Washer Part No. 1408-0065.

ELC4-325-580 Inert Gas 3000 0740-0070 0799-0809 0790-0208 0973-0003 --- 0970-0004 0950-0017 1424=0529 --- 0707-1428

(e) Swivels include Filter 0717-0003 pre-installed.

TABLE 2 - Relief Valve

Edge Model

ESS7-125

ESS7-200

(VENTED)

ESS7-200-350

SERVICE & REPAIR PROCEDURES

ESS7, EST4, ESL4 & ELC4 Single Stage EDGE™ Series Regulators

DISASSEMBLY PROCEDURES

Refer to the exploded views for reference numbers [Shown in brackets]

1. Mount the Inlet Swivel Assembly Plug (hereafter called “Inlet Plug”) in the Bench Vise
and firmly attach the Regulator. If you do not have or do not wish to use an Inlet Plug,
you may also clamp the Regulator in the Bench Vise by the hex on the back of the Body.

2. Remove the Knob Decal [19], and remove the #10-32 Screw [10], Lock Washer [18] and
Washer [17] located inside the Knob [23]. The Knob can now be removed.

3. Remove the 6 Socket Head Cap Screws [16]. The Bonnet [15] can now be removed.

TIP: Be careful when removing the Bonnet, as the Diaphragm Assembly can
sometimes stick to it when disassembling.

4. Remove the Drive Screw [13], Guide Bushing [12], and Thrust Washer [14]. The Guide
Bushing can be separated from the Drive Screw by removing the #10-32 Screw [10] and
Washer [11] installed in the bottom of the Drive Screw.

TIP: Make sure you’ve got the Thrust Washer. If it’s not sitting on top of the Drive
Screw, it may still be up inside the Bonnet.

5. Remo ve the Adjusting Spring [22], Diaphragm Assembly [2] (including the Back-Up Ring

[2A] on 200 psig delivery models), or Diaphragm Assembly, Shim & O-Ring [2B, 2C &
2D] on ELC4 models. Then remove the Nozzle [9] from the Body.

6. Remove the Seat Assembly [21], Valve Spring [7], Gland [6], Friction Damper [5] and
Seat Guide [4] from the Body.

TIP: The easiest way to get the Seat Guide out is to simply flip the Body over.

7. Remove the Gauge(s) [29 & 30], Outlet Connection [27] and Relief Valve and/or Pipe
Plugs [20 & 28] (if necessary) from the Body.

8. Screw the Leverage Bar Tool RT-180 into one of the Body ports (lightly hand tight), and
use the bar to unscrew the Body off the Inlet Swivel [26].

TIP: Watch the Inlet Swivel while trying to turn the Body. If the Swivel is turning with
the Body, then you need to tighten the Inlet Nut tighter on the Inlet Swivel Assembly
Plug.

It is also acceptable to use a Wrench and Socket on the hex of the Inlet Swivel, but take
caution not to damage the hex in any way.

9. Remove the Inlet Filter:
EST4, ESL4 and ELC4 models: The Inlet Filter [3] is a mesh screen with a tubular ring

surrounding it. It is installed into the body with the tubular ring flattened to secure it into
the port. Remove the Filter by prying it out, or by pushing it out from the inside of the
Body, with a Screwdriver or Punch.

ESS7 models: The Inlet Filter [3] is a sintered cone shape that is pressed into the end
of the Inlet Swivel [26]. It can be removed by lightly tapping at it from the inside with a
flat bottom Punch.

10. If necessary, disassemble the Relief Valve as shown in Page 1, DETAIL A.

ESS7/EST4/ESL4/ELC4

- 20 -

SECTION 3

 CAUTION! Discard the used Nozzle O-Ring, Inlet Filter, Diaphragm Assembly,

Seat Assembly and Friction Damper. Replace them with new parts each time you
assemble a Regulator.

All of these recommended components are available together in convenient repair kits for
your ESS7, EST4, ESL4 or ELC4 model Regulator. See TABLE 1 on Page 3 for your
specific application.

Repair Kit Part No. Description

RK-ESS7-X 0790-0167 ESS7 Repair Kit for Oxygen, Inert Gases, Air, CO

N

O, Hydrogen.

2

RK-ESS7-X200 0790-0168 ESS7 Repair Kit - 200 PSIG Delivery Models Only -

for Oxygen, Inert Gases, Air, CO
RK-ESS7-F 0790-0169 ESS7 Repair Kit for Acetylene, LP Gas.
RK-STSL-X 0790-0170 EST4/ESL4 Repair Kit for Oxygen, Inert Gases, Air,

CO

, N2O.

2

RK-STSL-F 0790-0171 EST4/ESL4 Repair Kit for Acetylene, LP Gas,

Hydrogen.
RK-ELC4-X 0790-0172 ELC4 Repair Kit for Oxygen, Inert Gases, Air, CO

CLEANING PARTS

, N2O, Hydrogen.

2

,

2

2

It is recommended to clean all metal parts for oxygen service, regardless of Regulator Model
being repaired. There are several ways to clean components for oxygen service; the
following standards are recommended reading for more detailed information on methods and
processes:

• CGA G-4.1 “Cleaning Equipment for Oxygen Service”

• ASTM G-93 “Standard Practice for Cleaning Methods and Cleanliness Levels for

Material and Equipment Used in Oxygen-Enriched Environments”

• ASTM G-127 “Standard Guide for the Selection of Cleaning Agents for Oxygen
Systems”

For metal parts, Victor brand suggests using CCI Envirospray Liquid, used per the
manufacturer's instructions, followed by a hot water rinse and thorough drying. Additional
information can be found at

http://www.ccichemical.com.

DO NOT allow non-metal parts to come in contact with cleaning solvents. Cleaning solvents
can cause non-metal parts to swell and/or crack. To clean these parts, use a non-petroleum
based mild soap solution, followed by a thorough rinsing in water. Dry parts completely prior
to reassembling.

ASSEMBLY PROCEDURES

Refer to the exploded views for reference numbers [Shown in brackets]

 IMPORTANT NOTES ABOUT SEALING PIPE THREADS:

• When using Teflon® tape where noted: Apply two to three layers around the
threads, leaving the first thread clean. Insure your Teflon® tape is oxygen­compatible.

• When using Loctite® #222 Threadlocker where noted: Apply two to three drops
to the second and third thread, leaving the first thread clean.

ESS7/EST4/ESL4/ELC4

- 21 -

SECTION 3

1. Filter Installation:
EST4, ESL4 and ELC4 Models: Install the new Inlet Filter screen [3] into the

appropriate inlet port in the Body. To retain the Inlet Filter in the Body, flatten the Filter’s
tubular ring with a flat bottom Punch.

ESS7 Models: Install the new Filter [3] into the Inlet Swivel [26] by pressing in a Vise.

2. Install the Inlet Nut [24] onto the Inlet Swivel, and apply either Teflon® tape or Loctite®
#222 to the Inlet Swivel threads.

3. If not already in place, mount the Inlet Plug (if one is being used) back in the Bench Vise.
Firmly attach the Inlet Swivel and Inlet Nut onto the Inlet Plug. If not using an Inlet Plug,
simply clamp the Body itself into the Vise using the hex on the back of the Body.

4. Either screw the Body onto the Inlet Swivel using the Leverage Bar Tool RT-180, or
tighten the Inlet Swivel into the Body using a Wrench and Socket, taking care not to
damage the Inlet Swivel hex. Torque the Inlet Swivel 20-25 ft-lbs.

5. Apply either Teflon® tape or Loctite® #222 to the Gauge(s) [29, 30] and any Pipe Plugs

[20], and install into the Body using a minimum of 10 ft-lbs. torque.

6. Preassemble the Relief Valve (if so equipped):
Assemble (or reassemble) the Relief Valve [28] as shown in DETAIL A. Use no

lubricants or sealants. If your Regulator model has a Pipe Plug instead of a Relief Valve,
or if your Relief Valve is already assembled and tested, you can skip to STEP 10.

7. To ensure proper Relief Valve performance, perform the following test procedures before
assembling the Relief Valve in the Regulator.

a. Attach the Relief Valve to a 450 PSIG source of oil-free air or dry nitrogen.
b. Slowly pressurize the Relief Valve, increasing to the recommended blow-off pressure

listed below. Note that
pressure, in case you’re unsure which Relief Valve you have.

Non-Vented Relief Valves:

If the Relief Valve vents before the minimum blow-off pressure is reached, then a
second Disc [28E] may be added.

If it still vents, then the Spring [28F] must be replaced.

Vented Relief Valves:

If the Vented Relief Valve fails to vent within the recommended blow-off pressure,
reset the Adjusting Screw [28J] as necessary and perform this step again. Make
sure you fully bleed off all pressure each time you test for blow-off pressure.

Regulator Max.
Delivery Pressure

15 PSIG 30 PSIG 27 to 33 PSIG
40 PSIG 60 PSIG 55 to 66 PSIG
125 PSIG 200 PSIG 180 to 220 PSIG
200 PSIG 400 PSIG 360 to 440 PSIG

8. When all testing is completed, bleed pressure off the Relief Valve. Install the Cap Nut

[28K] on the Vented Relief Valve.

VICTOR Relief Valves are stamped with their nominal set

Mating Relief
Valve (Nominal)

Recommended
Blow-off Pressure

9. Apply either Teflon® tape or Loctite® #222 to the Relief Valve threads. Install the Relief
Valve into the Body and torque to a minimum of 10 ft-lbs.

ESS7/EST4/ESL4/ELC4

- 22 -

SECTION 3

10. Apply only Loctite® #222 threadlocker to the Outlet Connection [27] threads. Install the
Outlet Connection into the Body and torque to 15 ft-lbs.

11. At this point, thoroughly blow out the Body assembly with pressurized oil-free air or dry
nitrogen to insure it is completely free of chips and debris.

12. Install the Seat Guide [4] into the Body – it should slip in freely. Note its orientation when
installing – the angled end faces down, into the Body.

TIP: Make sure the Seat Guide is installed straight. It should appear flat and level in
the body (not tilted at an angle). To ease installation, use a small Screwdriver or
Punch that can fit through the center hole of the Seat Guide. Slip the Seat Guide
onto the Screwdriver, then, while holding the Seat Guide up on the shank, position
the end of the Screwdriver approximately centered down inside the body (below the
assembly location of the Seat Guide). Then, simply drop the Seat Guide, letting it
slide down the Screwdriver and fall into position.

13. Preassemble the seat components: Push the Friction Damper [5] into the Gland [6],
and then slip the Valve Spring [7], Gland and Friction Damper onto the shaft of the Seat
Assembly [21].

TIP: The Friction Damper should have enough tension to hold the Gland and the
Valve Spring in position on the shaft of the Seat Assembly. If there appears to be no
tension (if the parts just seem to want to fall off), then there may be a problem with
your Friction Damper, or the Friction Damper may not be firmly pushed up in place
inside the Gland.

Then install the preassembled seat components into the Regulator Body – with the
Friction Damper and Gland fitting down into the cup shape of the Seat Guide.

14. Install the new O-Ring [8] onto the Nozzle [9], fitting it in place over the small ridge on the
bottom of the Nozzle. DO NOT use lubricant on the O-Ring. Install the Nozzle/O-Ring
into the Regulator Body and torque to 20 ft-lbs.

15. Preassemble the Adjusting Mechanism: Apply CHRISTO-LUBE® #129 Lubricant to
the entire length of the threads of the Drive Screw [13], and screw the Guide Bushing

[12] onto the Drive Screw (by hand) all the way up until it stops (do not over-tighten!).

Note that this is a left hand thread. Next, apply only Loctite® #222 to the threads of the
#10-32 Screw [10], and install the Screw and Washer [11] into the Drive Screw –
tightening until snug.

TIP: Make sure you’ve got the Drive Screw oriented correctly – the Screw and
Washer you just installed should be in the end that’s opposite the square flats.

16. Diaphragm Assembly:
EST4, ESL4 and ESS7 models: Install the Diaphragm Assembly [2] into the Body.

Note that the Diaphragm centers itself in a recessed pocket in the top of the Body.
ESS7 200 PSIG Delivery models: Install the Diaphragm Assembly [2] into the Body.

Note that the Diaphragm centers itself in a recessed pocket in the top of the Body. Then
install the Backup Ring [2A] over the Diaphragm Assembly. Insure it is oriented as
shown in the Exploded View detail on Page 1.

ELC4 Models: Apply a very light coat of CHRISTO-LUBE® #129 Lubricant to the
Diaphragm O-Ring [2D] and install it into the groove in the top of the Body. Next, place
the Diaphragm Assembly [2C] on top of it. Note that the Diaphragm centers itself in a
recessed pocket in the top of the Body. Lastly, install the Diaphragm Shim [2B] on top of
the Diaphragm Assembly. It sits loosely on top of the Diaphragm Assembly, centered on
the Body.

ESS7/EST4/ESL4/ELC4

- 23 -

SECTION 3

17. Install the Adjusting Spring [22], preassembled Adjusting Mechanism and Thrust Washer

[14] onto the Regulator Body. Don’t forget the Thrust Washer! Regulator function will

be impaired without it.

18. Install the Bonnet [15] onto the Body. Take care while slipping the Bonnet down over the
internal components – the ribs inside the Bonnet must slide into the scallops of the Guide
Bushing.

19. Install the six Socket Head Cap Screws [16] into the Bonnet. Tighten all bolts until snug,
then torque each to 12-15 ft-lbs in the sequence shown in FIGURE 1.

FIGURE 1 - Torque Sequence for Bonnet Screws

20. Apply a small amount of CHRISTO-LUBE® #129 to the top surface of the Bonnet (the
surface around the square of the Drive Screw), then slip the Knob [23] into position – with
the square hole inside the knob mating to the square shaft of the Drive Screw.

21. Install the #10-32 Screw [10], Lock Washer [18] and Washer [17] to hold the Knob on.
Torque this Screw a minimum of 30 in-lbs.

22. Apply new Knob or Gas Information decals [19, 31] as needed to insure the Regulator
maintains clear visual identification.

23. Remove the Regulator from the Inlet Plug or Bench Vise. It is now ready to test.

RECOMMENDED TOOLS AND SUPPLIES FOR TEST PROCEDURES

• Test Gun (quick opening on/off valve) with #52 (.0635”) restricting orifice

• Source of oil-free air or dry nitrogen

ESS7/EST4/ESL4/ELC4

- 24 -

SECTION 3

TEST PROCEDURES

 WARNING! 

For your safety, and the safety of others:

• Always test with oil-free air or dry nitrogen only.

• Always wear eye protection while testing a Regulator.

• Always perform all of the following test procedures after reassembling a Regulator.

1. Adjust the Test Manifold to the proper pressure shown in TABLE 4.

Regulator Model Gas Service Manifold Pressure for Testing
EST4, ESL4, ELC4

ELC4-325-580

ESS7

Acetylene 30±5 PSIG
All Other Gases 200±20 PSIG
Nitrogen 350±20 PSIG
Acetylene & LP Gas 250±20 PSIG
CO2 & N2O 1000±100 PSIG
Air, Argon, Hydrogen,

Helium, Nitrogen, Oxygen

2000±100 PSIG

TABLE 4 – Regulator Test Pressures

2. Attach the Regulator to the Manifold connection or test adapter. Start the nut by hand
(do not force), and tighten securely with a wrench to create a seal.

3. Turn the Regulator Adjusting Knob clockwise two or three times until you feel slight
tension being applied to the Adjusting Spring.

4. Slowly open and close the Manifold Valve two or three times to remove contamination
that may cause malfunctions. Leave the Manifold Valve closed.

a. If no flow comes through the Regulator, determine the cause – refer to the

TROUBLESHOOTING CHART at the end of this section.

5. Turn the Adjusting Knob counterclockwise until it stops, and attach the Test Gun (with a
#52 restricting orifice) to the outlet of the Regulator.

6. Open the Test Manifold Valve and close the Test Gun.
a. Manifold working pressure will appear on the High Pressure Gauge.
b. If the Low Pressure Gauge begins to show pressure building, turn the Test Manifold

off and refer to the TROUBLESHOOTING CHART.

7. Use the values in the following TABLE 5 for all subsequent tests:

Nominal
Delivery
Pressure

15
40
80
125
200
325

A
Pressure Set
for Leak Test

15 PSIG 10 PSIG 4 PSIG 2 PSIG
40 PSIG 10 PSIG 4 PSIG 2 PSIG

80 PSIG 10 PSIG 4 PSIG 2 PSIG
125 PSIG 20 PSIG 5 PSIG 2.5 PSIG
200 PSIG 20 PSIG 5 PSIG 3 PSIG
200 PSIG 20 PSIG 5 PSIG 5 PSIG

Pressure Set for

Creep/Drop Test

B

C

Drop

Allowance

D

Initial Shut-off

Allowance

ESS7/EST4/ESL4/ELC4

TABLE 5 –Regulator Test Values

- 25 -

SECTION 3

8. ESS7 LEAK TEST (When HP/LP Gauges are present):
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver A PSIG.
b. Close the Manifold Valve and turn the Adjusting Knob one turn counterclockwise.
c. Observe the Low Pressure and High Pressure Gauges for five (5) minutes:

1. If the High Pressure Gauge reading drops, there is a leak in the Cylinder Valve,
Inlet Connection, High Pressure Gauge or the rear plugged high pressure port.

2. If the Low Pressure Gauge reading drops, there is a leak in the downstream
equipment, Low Pressure Gauge, Outlet Connection or Relief Valve port.

3. If the High Pressure Gauge reading drops at the same time the Low Pressure
Gauge reading increases, there is a leak in the Regulator Seat.

d. If any leaks are found, isolate if possible using a liquid leak detector, disassemble and

repair or replace parts as needed, and start the test over again. Refer to
TROUBLESHOOTING CHART for more detailed cause and possible corrective
action information.

9. EST4, ESL4, ELC4 LEAK TEST (When only LP Gauge is present):
a. With the Re gulator set at A PSIG, use a liquid leak detector to check for external

leaks around all ports, caps, vents, etc. No visible leaks allowed.

10. DROP TEST
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver B PSIG.

b. Open the Test Gun and note the new indicated delivery pressure. Drop (indicated

pressure static minus indicated pressure flowing) must not exceed C PSIG.

11. CREEP TEST / SLOW SHUT-OFF TEST
a. With the Test Gun closed and the Manifold Valve open, adjust the Regulator to

deliver B PSIG.

b. Open and close the Test Gun several times to stabilize the Regulator. Leave the test

gun closed.

c. Observe the Low Pressure Gauge for five (5) minutes:

1. During the first minute, an initial shut-off increase of D PSIG is permissible.

2. During the next 4 minutes, no further increase (creep) is allowed.

12. Close the Manifold Valve and release all pressure from the Regulator by opening the
Test Gun. Turn the Adjusting Knob counterclockwise until it stops.

13. Remove the Test Gun from the Regulator.

14. Remove the Regulator from the Test Manifold. The Regulator is now ready to use.

ESS7/EST4/ESL4/ELC4

- 26 -

SECTION 3

TROUBLESHOOTING

CAUSES POSSIBLE CORRECTIVE ACTIONS

1. No gas flows through the Regulator and the High Pressure Gauge does not
indicate pressure (or if no High Pressure Gauge is present).

a. Inlet or Inlet Filter is plugged. Blow 40-45 PSIG of air through the Filter in

reverse direction of the normal gas flow.

b. Empty Supply Cylinder. Replace the Cylinder.

2. No gas flows through the Regulator and the High Pressure Gauge does indicate
pressure (or if no High Pressure Gauge is present).

a. Damaged Adjusting Mechanism or

missing components.

b. Adjusting Knob not installed

correctly.

c. Outlet Connection plugged. Inspect and clear the Outlet Connection of

d. Broken Adjusting Spring. Replace the Adjusting Spring.
e. Broken Seat Stem. Replace the Seat Assembly.

Check the Drive Screw, Guide Bushing and
Thrust Washer – insure they are installed
correctly and moving freely in the Bonnet.

Make sure the square of the Drive Screw is
properly mated into the square in the
Adjusting Knob.

any debris.

3. Gauge(s) do not indicate pressure but gas flows through the Regulator.

a. Defective Gauge(s). Replace Gauge(s).

4. Regulator does not deliver in its designed delivery pressure range.

a. Incorrect Adjusting Spring used

during repair.

b. Damaged Adjusting Mechanism or

missing components.

5. Regulator hums or clatters while flowing.

a. Missing Friction Damper. Install a Friction Damper.
b. Missing Bottom Guide. Install the Bottom Guide.
c. Flow exceeds Regulator capacity. Reduce flow to below the maximum rating of

d. Restriction upstream of the

Regulator.

Replace with correct Adjusting Spring.

Check the Drive Screw, Guide Bushing and
Thrust Washer – insure they are installed
correctly and moving freely in the Bonnet.

the Regulator.
Inspect system and remove restriction.

ESS7/EST4/ESL4/ELC4

- 27 -

SECTION 3

CAUSES POSSIBLE CORRECTIVE ACTIONS

6. Regulator experiences excessive drop.

a. Friction Damper too tight. Replace the Friction Damper and/or Gland.
b. Wrong size orifice in Test Gun. Insure the correct orifice is installed in the

Test Gun - size #52 (.0635”).
c. Partially plugged Inlet Filter. Clean or replace the Inlet Filter.
d. Incorrect Adjusting Spring used

during repair.

e. Low Cylinder pressure or Manifold

test pressure.

f. Flow exceeds Regulator capacity. Reduce flow to below the maximum rating of

7. Increase in the Low Pressure Gauge reading (creep).

a. Loose Nozzle. Tighten Nozzle to 20 ft-lbs torque.
b. Missing or damaged Nozzle O-

Ring.

c. Accumulation of foreign particles

on Seat Assembly or seating
surfaces.

Replace with correct Adjusting Spring.

Check Cylinder and Manifold pressure and

adjust/replace as needed.

the Regulator.

Inspect and install or replace O-Ring as

necessary.

Clean seating surfaces and/or replace Seat

Assembly.

8. With the cylinder valve closed, the High Pressure Gauge indicator drops, and
there is no immediate increase in pressure indicated on the Low Pressure
Gauge.

a. Loose connection – Regulator to

Test Manifold.

b. Loose connection – Inlet Swivel to

Regulator Body.

c. Loose connection – High Pressure

Gauge to Regulator Body.

d. Leaking Gauge. Replace the Gauge.

9. Low Pressure Gauge indicator slowly drops, and there is no decrease in
pressure on the High Pressure Gauge when the Manifold Valve is closed.

a. Test Gun is not attached securely. Tighten the Test Gun.
b. Loose connections at the Regulator

Body – Outlet Connection, L.P.
Gauge or Relief Valve/Plugs

c. Loose connection – Bonnet to

Body.

d. Damaged Diaphragm. Replace Diaphragm Assembly.

Insure Regulator is securely tightened to the
Manifold.

Tighten the Swivel using 20 ft-lbs torque.

Tighten the High Pressure Gauge using 10 ft­lbs torque minimum.

Tighten connections using 15 ft-lbs torque
minimum.

Tighten Bonnet Screws using 12-15 ft-lbs.
Follow the sequence shown in STEP 19
FIGURE 1 of the Assembly Procedure.

ESS7/EST4/ESL4/ELC4

- 28 -

SECTION 3

/

/

CAUSES POSSIBLE CORRECTIVE ACTIONS

10. Rapid pressure drop on both High and Low Pressure Gauges.

a. Loose connection – Bonnet to

Body.

b. Loose connection – Regulator to

Test Manifold.

11. Rapid increase in Low Pressure Gauge reading.

a. Damaged or loose Nozzle. Replace and/or tighten the Nozzle to 20 ft-

b. Heavy accumulation of foreign

particles on Seat Assembly or
seating surfaces.

c. Missing or damaged Nozzle O-

Ring.

d. Improper Adjusting Spring (spring

too long).

Tighten Bonnet Screws using 12-15 ft-lbs.
Follow the sequence shown in STEP 19
FIGURE 1 of the Assembly Procedure.

Insure Regulator is securely tightened to the
Manifold.

lbs torque.
Clean seating surfaces and/or replace Seat

Assembly.

Inspect and install or replace O-Ring as
necessary.

Replace Adjusting Spring.

12. Relief Valve opens at a greater or less than marked pressure (outside a
pressure tolerance of ±15% of the marked pressure).

a. Incorrect Spring used. Replace with correct Spring.
b. Relief Valve not set properly. Repeat Relief Valve assembly/test

U.S. Customer Care: 800-426-1888

WOR LD H E ADQUARTE RS: 16052 Swingley Ridge Road, Suite 300 • St. Louis, Missouri 63017 U.S.A

Denton, TX USA
U.S. Cus tomer Care

Ph: (1) 80 0-426-1888
Fax: ( 1) 800-535-0557

Miami,FL USA
Sales Offi ce, Latin Ameri ca

Ph: (1) 954 -727-8371
Fax: [phone]

Form No. 0056-1966
Revision: D

Oakville,Ontario, Canada
CanadaCustomer C are

Ph: (1)905-827-4515
Fax: [phone]

Internati onal Customer Care

Ph: (1)905-827-9777
Fax: [phone]

procedure STEP 6.

FAX

800-535-0557•International Customer Care: 940-381-1212

A Global Cutting& Welding Market Leader

Chorley,UnitedKingdom
Customer Care

Ph: (44) 1257-261755
Fax: [phone]

Milan, Italy
Customer Care

Ph: (39) 0236546801
Fax: [phone]

ASIA/PACIFICEUROPETHE AMERICAS

Cikarang, Indonesia
CustomerCare

Ph: 62 21+8983-0011 /0012
Fax: 62 21+893-6067

Osaka, Japan
Sales Office

Ph: 816-4809-8411
Fax: [phone]

- 29 -

Melbourne, Au stralia
Australia CustomerCare

Ph: 1300-654-674
Fax: 613+ 9474-7391

Internatio nal

Ph: 613+9474-7508
Fax: 613+9474-7488

FAX

www.victorequip.com

Rawang, Malaysia
CustomerCare

Ph: 603+6092-2988
Fax: 603+ 6092-1085

940-483-8178

™

Shanghai, China
SalesOff ice

Ph: 86 21 [phone]
Fax: 86 21+ 3226-095

Singapore
SalesOffice

Ph: 65+ 68 32-8 066
Fax: 65+6763-5812

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5