Emerson CSB400 Instruction Manual

Instruction Manual
Form 5836

June 2014

CSB400 Series

CSB400 Series Commercial / Industrial
Pressure Reducing Regulators

P1426 P1425

Table of Contents

P1424

TYPICAL TYPE CSB403 REGULATOR WITH
INTEGRAL TRUE-MONITOR™ REGULATOR

Figure 1. Typical CSB400 Series Pressure Reducing Regulators

TYPICAL TYPE CSB400 REGULATOR

Introduction

TYPICAL TYPE CSB404 REGULATOR WITH
INTEGRAL TYPE VSX4 SLAM-SHUT MODULE

Introduction ..................................................................... 1

Speci cations .................................................................2

Principle of Operation ..................................................... 8

Installation and Overpressure Protection ..................... 11

Commissioning ............................................................. 15

Adjustment....................................................................15

Shutdown......................................................................17

Maintenance and Inspection.........................................19

Parts Ordering ..............................................................20

Parts List.......................................................................21

www.fisherregulators.com

Scope of the Manual

This Instruction Manual provides installation, maintenance
and parts ordering information for the CSB400 Series
regulators. Instructions and parts lists for other
equipment mentioned in this instruction manual are
found in separate manuals.

D103123X012

CSB400 Series

Specications

The Specications section lists the specications for the CSB400 Series Regulators. The following information is stamped
on the nameplate of CSB400 Series: Type and Class, Maximum Outlet Pressure and Spring Range.

Available Congurations

See Table 1

Regulator Type: Differential Strength (DS)

Accuracy Class: Up to AC5

(depending on Outlet Pressure)

Lock-up Class: Up to SG10

(depending on Outlet Pressure)

Failure Mode: Fail Open (FO)

Body Sizes and End Connection Styles

See Table 5

Integral Strength (IS) Pressure Ratings

(1)

See Table 3

Differential Strength (DS) Pressure Ratings and

Flow and Sizing Coefcients

(1)

See Table 4

Operating Pressure Ranges

(1)

Regulator: See Table 6
Integral True-Monitor™ Module: See Table 7
Slam-Shut Module: See Table 8

Maximum Outlet Pressures

(1)

Emergency: 4.0 bar / 58 psig
To Avoid Internal Parts Damage:

Type CSB450: 1 bar / 14.5 psig above outlet
pressure setting
All other Types: 0.34 bar / 5 psig above outlet
pressure setting

Operating: 3.0 bar / 43.5 psig

Spring Case Vent Connection

1 NPT

Orice Size

17.5 mm / 11/16 inch

Pressure Registration

Internal, External or Dual (Internal and External)

Operating Temperature (TS)

(1)(2)

According to PED Standards:
All Types: -20 to 66°C / -4 to 150°F
Non-PED with standard construction:

Types CSB400/CSB404, CSB420/CSB424:

-20 to 66°C / -4 to 150°F

Types CSB450/CSB454

(3)

:

-30 to 66°C / -20 to 150°F

Non-PED with low temperature construction:

Types CSB400F/CSB404F

(3)

, CSB420F/CB424F

-30 to 66°C / -20 to 150°F

Approximate Weights

With Threaded body
Type CSB400: 4.1 kg / 9 pounds

Type CSB403: 9.1 kg / 20 pounds
Type CSB404: 5.0 kg / 11 pounds

With Flanged Body:

Add 4.1 kg / 9 pounds to threaded weights
listed above

PED Conformity Statement and Information

The CSB400 Product Series is in conformity with the
Pressure Equipment Directive PED 97/23/EC. The
exceptions to this previous statement are the
Types CSB403 and CSB423. Both of these types are

not yet certied to conform with the PED Directive.

Pressure regulator does not require any
supplementary upstream safety accessory for
protection against overpressure compared with
its design pressure PS, when upstream reducing
station is sized for a max downstream incidental
MIPd <= 1.1 PS.

PED Related Information

See Table 2

(3)

:

1. The pressure/temperature limits in this Instruction Manual or any applicable standard limitation should not be exceeded.

2. Standard token relief set values listed in Table 8 are based on -20 to 60°C / -4 to 140°F.

3. Product has passed Emerson Process Management Regulator Technologies, Inc. (Regulator Technologies) testing for lockup, relief start-to-discharge and reseal down to -40°.

2

Table 1. Available Congurations

CSB400 Series

TYPE NUMBER

C S B 4

OPTIONS

PRESSURE CONSTRUCTION AND UPSTREAM MONITOR APPLICATIONS

0 Low Pressure Applications (Outlet Pressure: 17 to 100 mbar / 7 to 40 inches w.c.)

1 Low Pressure, Upstream Monitoring Applications

2 Medium Pressure Applications (Outlet Pressure: 100 to 517 mbar / 40 to 208 inches w.c.)

3 Medium Pressure, Upstream Monitoring Applications

5 High Pressure Applications

OVERPRESSURE PROTECTION

0 Without Overpressure Protection Module

0F Low Temperature Capability, Without Overpressure Protection Module

3 With Integral True-Monitor™ Module

3F Low Temperature Capability, With Integral True-Monitor Module

4 With Type VSX4 Slam-shut Module

4F Low Temperature Capability, With Type VSX4 Slam-shut Module

PRESSURE REGISTRATION

D Dual Registration (Best solution for quick changing loads)

E External Registration

I Internal Registration

RELIEF

N No Relief

T Internal Token Relief

Example: Type number CSB424DT: Type CSB400 regulator constructed for medium pressure applications, with Type VSX4 slam-shut module,
Dual pressure registration and Internal Token relief.

1. Not available with Integral True-Monitor option.

2. Not available with Integral True-Monitor or Token Relief option.

3. Available with External Pressure Registration only.

4. Reference Instruction Manual D103126X012 for information regarding the Type TM600 Integral True-Monitor module.

5. Reference Instruction Manual D103127X012 for information regarding the Type VSX4 Slam-Shut module.

(2)

(Outlet Pressure: 0.50 to 3.0 bar / 7 to 43.5 psig)

(4)

(5)

(1)(3)

(Outlet Pressure: 17 to 100 mbar / 7 to 40 inches w.c.)

(1)(3)

(Outlet Pressure: 100 to 517 mbar / 40 to 208 inches w.c.)

(4)

(5)

WARNING

!

Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion

and/or re causing property damage and

personal injury or death.

Fisher® regulators must be installed,
operated, and maintained in accordance
with federal, state, and local codes,
rules and regulations and
Regulator Technologies instructions.

If the regulator vents gas or a leak
develops in the system, service to the unit
may be required. Failure to correct trouble
could result in a hazardous condition.

Call a gas service person to service the

unit. Only a qualied person must install

or service the regulator.

Description

CSB400 Series regulators are typically installed on
industrial and commercial applications. See Table 1 for

Available Congurations. Low, Medium and High outlet

pressure constructions are available via Types CSB400,
CSB420 and CSB450, respectively, that provide outlet
setpoints ranging from 17 mbar to 3.0 bar / 7 inches w.c.
to 43.5 psig. Also available are upstream monitoring

congurations such as Types CSB410 and CSB430,

which are installed upstream of the primary regulator to
provide overpressure protection.

Types that include an “F” refer to the cold temperature
construction of the base Type number. For example, the
Type CSB404F provides a cold temperature construction

of the Type CSB404. Refer to the Operating Temperature

section found on the following page for additional
information regarding temperature capabilities and refer
to Table 7 for inlet pressure limitations. For types that
include an “F”, refer to the base type number for general
information such as Principles of Operation, Maintenance
instructions, Warnings and Cautionary notes.

3

CSB400 Series

TS

REGULATOR SLAM SHUT SERIAL NO.

TEMP CLASS DOM

PS FLUID GROUP CAT LOC

Std: EN334

TYPE PSD

Pumax Pmax

Matl

Wds

Case

Failure Mode

REGULATOR

DN SEAT BODY
PN MATL

0062

PED mfg: Chartres,

France

REGULATOR SLAM SHUT SERIAL NO.

PATENT
PENDING

0062

SLAM SHUT

Std: EN14382

TS

PS FLUID GROUP CAT LOC

DN SEAT BODY
PN MATL

RELAIS Pu Max

RELAY Max IN

MATL P max
CASE Max OUT

TYPE PSD CLASS

Wdso Wdsu

OP range UP range

PED mfg: Chartres,

France

SLAM-SHUT NAMEPLATE

Figure 2. CSB400 Series Regulator, Slam-shut and Integral True-Monitor™ Nameplates and Labels

TYPE DESCRIPTION PED CATEGORY FLUID GROUP

CSB400, CSB400F, CSB410, CSB420,

CSB420F, CSB430 and CSB450

CSB404, CSB404F, CSB414, CSB424,

CSB424F, CSB434 and CSB454

European EN Reference Standards EN 334, EN 14382

TEMP CLASS DOM

REGULATOR NAMEPLATES

Table 2. PED Information

Base regulator I

Regulator with Slam-Shut Module IV

TYPE PSD

Pumax Pmax

Std: EN334

PATENT PENDING DOM

LOC

MAX EMER

Wds

REGULATOR

PED mfg: Chartres,

France

MAX IN ORIFICE SPG RANGE

OUT OUT

Failure Mode

TYPE NO.

INTEGRAL TRUE-MONITOR NAMEPLATE

Groups 1 and 2 according to PED 97/23/EC, 1st
and 2nd family gas according to EN 437 or other

gases (compressed air, nitrogen).

The gas must be non-corrosive, clean

(ltration on inlet side necessary) and dry.

Matl
Case

SERIAL NO.

RELIEF

MAX OP

Table 3. Integral Strength (IS) Pressure Ratings

MAXIMUM ALLOWABLE PRESSURE

TYPE

MAXIMUM EMERGENCY INLET PRESSURE

CSB400, CSB400F, CSB404 and CSB404F

CSB420, CSB420F, CSB424 and CSB424F

CSB450 and CSB454

CSB410 and CSB414

CSB403, CSB403F, CSB423 and CSB423F

CSB403 and CSB423

1. For the Integral Strength (IS) version, the maximum value of PS and P

P

S

bar psig bar psig

4.0 58 4.0 58

should be similar to the PSD used for the Differential Strength (DS) version.

umax

(1)

/

MAXIMUM OPERATING INLET PRESSURE

P

umax

Table 4. Differential Strength (DS) Pressure Ratings and Flow and Sizing Coefcients

TYPE

CSB400F and CSB404F

CSB403F and CSB423F 6.0 87 10.0 145

CSB403 and CSB423

CSB430 and CSB434

CSB400 and CSB404

CSB420F and CSB424F

CSB420 and CSB424

CSB450 and CSB454

1. If ordered with a PN 16 anged connection, PS rating is a maximum of 16.0 bar / 232 psig. PS rating may be lower than 16.0 bar / 232 psig as indicated by this table.

SPECIFIC MAXIMUM

ALLOWABLE

PRESSURE / MAXIMUM

EMERGENCY OUTLET

PRESSURE

PSD P

bar psig bar psig bar psig mm Inch CgCvC1X

MAXIMUM

OPERATING INLET

PRESSURE

umax

MAXIMUM

EMERGENCY

INLET PRESSURE

6.0 87 12.0 174

P

S

ORIFICE

(1)

SIZE

FLOW

COEFFICIENTS

WIDE OPEN

10.0 145 10.0 145CSB410 and CSB414

4.0 58

17.5 11/16 428 11 43 1.16 0.84 0.90

10.0 145 12.0 174

16.0 232 20.0 290

IEC SIZING

COEFFICIENTS

F

T

D

(1)

F

L

4

Table 5. Body Sizes, Material, End Connections and Pressure Ratings

BODY MATERIAL INLET SIZE, NPS OUTLET SIZE, NPS END CONNECTION

1 1
1-1/4 1-1/4 114 4.5
1-1/2 1-1/2 114 4.5

NPT

2 2 127 5

1 1

1 1-1/4 114 4.5

Ductile Iron

1-1/4 1-1/4 114 4.5

Rp

1-1/2 1-1/2 114 4.5

2 2 127 5

DN 50 / 2 DN 50 / 2

DN 40 / 1-1/2

(1)

DN 40 / 1-1/2

(1)

CL150 FF 254 10

PN 10/16 254 10

PN 16 Slip-On 184 7.24
1 2-1/4 Rp x GAZ 105 4.1
1 1

WCC Steel

1-1/4 1-1/4 114 4.5
1-1/2 1-1/2 114 4.5

1 1

1-1/4 1-1/4 114 4.5

NPT

Rp

1-1/2 1-1/2 114 4.5

1. Uses Rp 1-1/2 x 1-1/2 threaded body with PN 16 slip-on anges.

Table 6. CSB400 Series Primary Regulator Outlet Pressure Ranges

TYPE

CSB400, CSB400F,
CSB403, CSB403F,
CSB404, CSB404F,

CSB410 and CSB414

CSB420, CSB420F,
CSB423, CSB423F,
CSB424, CSB424F,

CSB430 and CSB434

CSB450 and CSB454

OPERATING PRESSURE

RANGES, W

d

mbar Inch w.c. mm Inch mm Inch

17 to 24 6.8 to 9.6 GE30191X012 Pink 2.03 0.080 152 6.00

24 to 35 9.6 to 14 GE43955X012 Orange Stripe 2.19 0.086 110 4.35

35 to 60 14 to 24.1 GE30201X012 Dark Green 3.23 0.127 11 0 4.35

54 to 100 21.7 to 40 GE30202X012 Tan 2.85 0.112 127 5.00

100 to 160 1.45 to 2.3 psig GE35081X012 Purple Stripe 3.86 0.152 124 4.90

138 to 300 2.0 to 4.4 psig GE30192X012 Dark Blue 4.27 0.168 118 4.65

276 to 517 4 to 7.5 psig GE33121X012 Red 4.93 0.194 11 8 4.65

500 mbar to 1 bar 7.3 to 14.5 psig GE30203X012 Light Blue 5.59 0.220 102 4.00

1 to 3 bar 14.5 to 43.5 psig GE30204X012 Light Green 6.73 0.265 100 3.95

PART

NUMBER

CSB400 Series

FACE-TO-FACE DIMENSION BODY PRESSURE RATING

mm Inch bar psig

100 4

100 4

100 4

100 4

SPRING

COLOR

SPRING WIRE

DIAMETER

20.0 290

16.0 232

20.0 290

SPRING FREE LENGTH

Table 7. Primary Regulator and Integral True-Monitor™ Outlet Pressure Ranges

PRIMARY REGULATOR INTEGRAL TRUE-MONITOR

TYPE

CSB403

CB403F

CSB423

CB423F

1. Recommended minimum Integral True-Monitor setpoints shown.

Factory Setpoint Set Pressure Range

mbar psig mbar psig

20 8 in w.c. 17 to 24

and

and

30 12 in w.c. 24 to 35

50 20 in w.c. 35 to 60

138 2 100 to 160 1.45 to 2.3

207 3 138 to 300 2.0 to 4.4

345 5 276 to 517 4 to 7.5 Red GE33121X012

6.8 to

9.6 in w.c.

9.6 to

14 in w.c.

14 to

24 in w.c.

0.78 to

1.45

Color P/N

Pink GE30191X012

Orange

Stripe

Dark

Green

Tan GE30202X012

Purple

Stripe

Dark
Blue

GE43955X012

GE30201X012

GE35081X012

GE30192X012

Factory Token Relief Set

% of

REG. Set

170% 35 14 in w.c.

150% 45 18 in w.c.

140% 70 1

130% 90 1.3 138 2 97 to 200

130% 180 2.6 241 3.5 197 to 255 2.6 to 3.7 Purple GE35081X012

125% 260 3.8 345 5

125% 430 6.25 448 6.5

mbar psig mbar psig mbar psig

No Token Relief 37 15 in w.c. 30 to 52

No Token Relief

No Token Relief

No Token Relief

No Token Relief 172 2.5 97 to 200

No Token Relief 276 4

No Token Relief 414 6

(1)

Factory Setpoint

52 21 in w.c. 45 to 75

70 1 65 to 99

103 1.5 97 to 200

(1)

Spring Range

21 in w.c.

30 in w.c.

40 in w.c.

1.4 to 2.9 Black GE30190X01269 1 54 to 100

248 to 414 3.6 to 6

352 to 517 5.1 to 7.5 Red GE33121X012

Color P/N

12 to

18 to

26 to

Blue GE30189X012

Green GE30196X012

Orange GE30225X012

Dark
Blue

GE30192X012

5

CSB400 Series

Table 8. Regulator and Slam-shut OPSO and UPSO Pressure Ranges

REGULATOR SLAM-SHUT MODULE

TYPE

Set Pressure

Range

Standard

Setpoints

Token Relief

(1)(2)

Set

Available

Token Relief

Range Shown

as a % of
Regulator

Setpoint

Overpressure Shutoff (OPSO) Underpressure Shutoff (UPSO)

Minimum
Required

Difference

between Token

Relief and
OPSO Set

Standard

OPSO Set

(1)

Values

P

Range as a %

of Regulator

dso

OPSO Set

Setpoint

Standard

UPSO Set

(1)

Values

P

Range as a %

of Regulator

dsu

UPSO Set

Setpoint

CSB404,

CSB404F

and

CSB414

CSB424,

CSB424F

and

CSB434

mbar psig mbar psig mbar psig Min

17 to 240.25 to

24 to 350.35 to

35 to 600.51 to

54 to

0.8 to

100

100 to

1.5 to

160

138 to

2.0 to

300

276 to

4.0 to

517

500 to

7.3 to

1000

20 0.29 34 0.49

0.35
21 0.30 36 0.52 45 0.65 11 0.16

27 0.39 41 0.59

30 0.44 45 0.65 57 0.83 15 0.22

0.51

35 0.50 53 0.76 67 0.96 18 0.26

50 0.70 70 1.0

0.87
60 0.87 84 1.2 108 1.57 30 0.44

75 1.10 98 1.4

1.5
100 1.5 130 1.9 170 2.47 50 0.73

150 2.2 195 2.8

2.3
160 2.3 208 3.0 264 3.83 80 1.2

300 4.4 375 5.4 125% 140% 50 0.73 450 6.53 150% 165% 150 2.2 50% 70%

4.4

500 7.3 625 9.1 125% 140% 60 0.87 700 10.2 140% 180% 250 3.6 50% 70%

7.5

1000 14.5 - - - - - - - - - - - - - - - - - - - - - - - - 1320 19.2 112% 140% 500 7.3 50% 70%

14.5

170% 215% 8 0.12

150% 160% 10 0.14

140% 158% 16 0.23

130% 140% 20 0.29

130% 140% 40 0.58

(2)

Max mbar psig mbar psig Min Max mbar psig Min Max

43 0.62

215% 270%

51 0.74

190% 200%

90 1.3

180% 200%

128 1.85

170% 190%

248 3.59

165% 175%

10 0.15

50% 56%

14 0.20

50% 60%

25 0.36

50% 70%

38 0.54

50% 70%

75 1.1

50% 70%

1200 17.4 - - - - - - - - - - - - - - - - - - - - - - - - 1600 23.2 112% 133% 600 8.7

(3)

CSB454

1. Standard factory set shown. Factory set is at the Minimum value of the range indicated. Range indicated is a percentage of Setpoint. Percentage indicated is based on the Set Pressure Range
in which that setpoint resides. If non-standard sets are required, adherence must be made to constraints shown in Table 7, including Token Relief Set Range, OPSO and UPSO set range and
Minimum Required difference between Token Relief and OPSO Set.

2. Minimum Token Relief values apply to -20 to 60°C / -4 to 140°F service temperatures. For service below -20°C / -4°F, add 8 mbar / 0.12 psig to the minimum Token Relief value listed.

3. Token Relief is not available for the Type CSB454.

1000 to

3000

1500 21.6 - - - - - - - - - - - - - - - - - - - - - - - - 1900 27.6 112% 127% 750 10.9

14.5 to

43.5
2000 29.0 - - - - - - - - - - - - - - - - - - - - - - - - 2400 34.8 112% 120% 1000 14.5

3000 43.5 - - - - - - - - - - - - - - - - - - - - - - - - 3400 49.3 112% 113% 1500 21.8

50% 70%

Example: If a non-standard setpoint is needed, see the following example for the proper use of Table 8.
Non-standard setpoint = 140 mbar / 2 psig, using the value presented above, the factory set of the token relief will be

1.3 x 140 = 182 mbar / 2.6 psig. The factory OPSO and UPSO set pressures are 165% and 50% of the non-standard
setpoint, respectively. The resulting settings are: OPSO = 231 mbar / 3.4 psig and UPSO = 70 mbar / 1 psig.

6

205 /

8.09

CSB400 Series

249 /

9.81

SPRING

(1)

REMOVAL

152 /

5.97

A

B

A

A/2

A/2

54 /

2.13

171 /

6.72

275 /

10.81

A

A/2

291 /

11.46

45 /

1.79

A

A/2

151 /

5.95

1 NPT

SCREENED

VENT

208 /

8.18

307 /

12.08

SPRING
REMOVAL

146 /

5.77

SLAM-SHUT

MODULE

TRUE-MONITOR™

MODULE

(2)

A

A/2

GE34270

1. MAXIMUM SPRING REMOVAL CLEARANCE FOR BOTH THE PRIMARY REGULATOR AND INTEGRAL TRUE-MONITOR IS 158 mm / 6.2 inches.

2. MAXIMUM SPRING REMOVAL CLEARANCE FOR THE SLAM SHUT IS 80 mm / 3.1 inches.

Figure 3. CSB400 Series Dimensions

Table 9. CSB400 Series Dimensions

BODY SIZE, NPS

BODY END

CONNECTION STYLE

1

1-1/4 114 4.5

1-1/2 114 4.5

NPT or Rp

2 127 5

DN 50 / 2 CL150 FF or PN 10/16 254 10

1 x 1-1/4 Rp 114 4.5

1 x 2-1/4 Rp x GAZ 105 4.1 20 0.8

DN 40 / 1-1/2 PN 16 Slip-On 184 7.2 97 3.8

FACE-TO-FACE DIAMETER (A) PITOT TUBE (B)

mm Inch mm Inch

100 4

97 3.8

mm / INCH

7

CSB400 Series

REGULATOR
ORIFICE

REGULATOR
DISK

M1143

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

REGULATOR
ADJUSTING SCREW

REGULATOR
CONTROL SPRING

BALANCED PORT
ASSEMBLY

VALVE STEM

LEVER

TOKEN RELIEF SPRING

PUSHER POST

EXTERNAL CONTROL LINE
(SENSE LINE)

Figure 4. Type CSB400DT Dual Registered Regulator Operational Schematic

Additional overpressure protection options include
Types CSB403 and CSB423, which offer True-Monitor™
protection provided by an integral monitor module installed
on the inlet side of the valve body. This Integral True-Monitor
assumes control of the pressure to the downstream
system should the primary regulator fail to regulate. The
Types CSB404, CSB424 and CSB454 are examples of

CSB400 Series congurations that offer a slam-shut module
that shuts off the ow of gas to the downstream system in

the event of outlet pressure rising above or falling below the

predened levels due to a failure.

Optional token relief is available, which acts as a low­capacity internal relief valve to relieve minor overpressure
situations due to nicks or other minor damage to the

orice or disk, or due to thermal expansion of the

downstream system.

Internal, external or dual outlet pressure registration is
available. Constructions with dual or external registration
require an external control line / sense line. For quick
changing loads, dual sense is recommended as it
provides the quickest response time.

Principle of Operation

Type CSB400 Base Regulator Operation

Refer to Figure 4. When downstream demand

decreases, the pressure under the regulator diaphragm
increases. This pressure overcomes the regulator
setting (which is set by the regulator control spring).
Through the action of the pusher post assembly, lever
and valve stem, the valve disk moves closer to the

orice and reduces gas ow. If demand downstream

increases, pressure under the regulator diaphragm
decreases. Spring force pushes the pusher post
assembly downward, the valve disk moves away from

the orice, and the gas ow increases downstream

as the regulator opens in response to the decreased
pressure underneath the regulator diaphragm.

Type numbers with a “T”, for example, Type CSB400IT,
provide a token or low-capacity relief. The Token relief
provides relief from minor overpressure caused by nicks

or dents on the orice or by thermal expansion of gas in

the downstream line. Token relief also provides a token or
signal, in the form of odor, that an overpressure situation
is occurring.

8

CSB400 Series

EXTERNAL CONTROL
LINE (SENSE LINE)

WIDE-OPEN INTEGRAL TRUE-MONITOR REGULATOR PRIMARY REGULATOR

M1145

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

MONITOR
LEVER

MONITOR ADJUSTING SCREW

REGULATOR ORIFICE

MONITOR CONTROL SPRING

MONITOR DISK

MONITOR
VALVE STEM

MONITOR ORIFICE

MONITOR
OPENING SPRING

REGULATOR
ADJUSTING SCREW

BALANCED PORT
ASSEMBLY

REGULATOR
VALVE STEM

REGULATOR
LEVER

REGULATOR
CONTROL SPRING

TOKEN RELIEF
SPRING

PRESSURE RETAINING
PLUG (DO NOT
REMOVE WHILE UNIT
IS PRESSURIZED)

REGULATOR
PUSHER POST

Figure 5. Type CSB403IT Internally Registered Primary Regulator with Externally Registered Integral True-Monitor™ Operational Schematic

OPSO SET SPRING

PROXIMITY
SWITCH PLUG

M1146

INLET PRESSURE

OUTLET PRESSURE

ATMOSPHERIC PRESSURE

OPSO ADJUSTING SCREW

VENT

RESET KNOB

SLAM-SHUT DISK

TYPE VSX4 SLAM-SHUT MODULE PRIMARY REGULATOR

UPSO ADJUSTING SCREW

UPSO SPRING

SENSE BLOCKING
SCREW

SLAM-SHUT
ORIFICE

REGULATOR ORIFICE

VALVE STEM

LEVER

REGULATOR
ADJUSTING SCREW

REGULATOR
CONTROL SPRING

TOKEN RELIEF
SPRING

EXTERNAL CONTROL
LINE (SENSE LINE)

Figure 6. Type CSB404ET Externally Registered Regulator and Slam-shut Operational Schematic

9