CLA-VAL 750B-4KG1 Installation Operation & Maintenance

750B-4KG1

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SHALL

THE

SUBJECT

HEREOF

BE

DISCLOSED

IN

ANY

MANNER

TO

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FOR

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EXCEPT

AS

HEREIN

AUTHORIZED,

WITHOUT

PRIOR

WRITTEN

APPROVAL

OF

CLA-VAL

CO.

THIS

DRA'MNG

IS

SUBMITTED

CONFIDENTIALLY

AND

MAY

NOT

BE

USED

IN

THE

MANUFACTURE

OF

ANY

MATERIAL

OR

PRODUCT

OTHER

THAN

SUCH

MATERIALS

AND

PRODUCTS

FURNSHED

TO

CLA-VAL

CO.

WHETHER

OR

NOT

THE

EQUIPMENT

OR

INFORMATION

SHOWN

HEREON

IS

PATENTED

OR

OTHERWISE

PROTECTED,

FULL

TITLE

AND

COPYRIGHTS,

IF

ANY,

IN

AND

TO

THIS

DRAWING

AND/OR

INFORMATION

DELIVERED

OR

SUBMITTED

ARE

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BEACH,

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CATALOG

NO.

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8 I

REV

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TYPE

OF

VALVf.

ANO

MAIN

FEATURES

FIRE

PUMP

RELIEF

VALVE

(UL

AND

FM

LISTED)

OPERATING

DATA

I.

PRESSURE

RELIEF

FEATURE:

DESIGN

DRAW

EK

CHK'D

CH

Af'l/D

BF

PRESSURE

RELIEF

CONTROL

(2)

IS A NORMALLY

CLOSED

CONTROL

THAT

RESPONDS

TO

MAIN

VALVE

INLET

PRESSURE

CHANGES.

AN

INCREASE

IN

07-07-98
07-07-98
07-07-98

INLET

PRESSURE

TENDS

TO

OPEN

CONTROL

(2)

AND A DECREASE

IN

INLET

PRESSURE

TENDS

TO

CLOSE

CONTROL

(2).

THIS

CAUSES

LOADING

CHAMBER

PRESSURE

TO

VARY

AND

THE

MAIN

VALVE

MODULATES

(OPENS

AND

CLOSES)

MAINTAINING A RELATIVELY

CONSTANT

PRESSURE

AT

THE

MAIN

VALVE

INLET.

WHEN

INLET

PRESSURE

IS

LOWER

THAN

THE

SET

POINT

OF

CONTROL

(2),

CONTROL

(2)

CLOSES.

THIS

PRESSURIZES

THE

LOADING

CHAMBER

AND

THE

MAIN

VALVE

CLOSES.

PRESSURE

RELIEF

CONTROL

(2)

ADJUSTMENT:

TURN

THE

ADJUSTING

SCREW

CLOCKWISE

TO

INCREASE

THE

SETTING.

II.

CHECK

VALVE

FEATURE:

WHEN

LOADING

CHAMBER

PRESSURE

IS

HIGHER

THAN

INLET

PRESSURE,

CHECK

VALVE

( 4)

CLOSES.

THIS

MAINTAINS

THE

HIGHER

PRESSURE

IN

THE

MAIN

VALVE

LOADING

CHAMBER

KEEPING

THE

MAIN

VALVE

CLOSED.

Ill.

CHECK

LIST

FOR

PROPER

OPERATION:

( )

SYSTEM

VALVES

OPEN

UPSTREAM

AND

DOWNSTREAM.

( )

AIR

REMOVED

FROM

THE

LOADING

CHAMBER

AND

PILOT

SYSTEM

AT

ALL

HIGH

POINTS.

( )

PERIODIC

CLEANING

OF

STRAINER

(5)

IS

RECOMMENDED.

"THIS

DRAWING

IS

THE

PROPERTY

OF

CLA-VAL

CO.

AND

SAME

AND

COPIES

MADE

THEREOF,

IF

ANY,

SHALL

BE

RETURNED

TO

IT

UPON

DEMAND.

DELIVERY

AND

DISCLOSURE

HEREOF

ARE

SOLELY

UPON

CONDITION

THAT

THE

SAME

SHALL

NOT

BE

USED,

COPIED

OR

REPRODUCED,

NOR

SHALL

THE

SUBJECT

HEREOF

BE

DISCLOSED

IN

ANY

MANNER

TO

ANYONE

FOR

ANY

PURPOSE,

EXCEPT

AS

HEREIN

AUTHORIZED,

WITHOUT

PRIOR

YIRITTEN

APPROVAL

OF

CLA-VAL

CO.

THIS

DRAWING

IS

SUBMITTED

CONFIDENTIALLY

AND

MAY

NOT

BE

USED

IN

THE

MANUFACTURE

OF

ANY

MATERIAL

OR

PRODUCT

OTHER

THAN

SUCH

MATERIALS

AND

PRODUCTS

FURNSHED

TO

CLA-VAL

CO.

WHETHER

OR

NOT

THE

EQUIPMENT

OR

INFORMATION

SHOWN

HEREON

IS

PATENTED

OR

OTHERWISE

PROTECTED,

FULL

TITLE

AND

COPYRIGHTS,

IF

ANY,

IN

AND

TO

THIS

DRAWING

AND/OR

INFORMATION

DELIVERED

OR

SUBMITTED

ARE

FULLY

RESERVED

CLA-VAL

CO."

Roll Seal

®

TM

750B - 4KG1

ROLL SEAL FIRE PUMP RELIEF VALVE

INTRODUCTORY INFORMATION

This manual is primarily intended for use as a manual for the UL listed and FM
approved Roll Seal 750B-4KG1 Fire Pump Relief Valves. Certain sections may contain
information that would be useful for the care installation and maintenance of other
Roll Seal products and Valve sizes. This extra data is intended as additional reference
information for the Roll Seal product line.

The product literature for the Roll Seal 750B - 4KG1 Fire Pump Relief Valve notes the
particular Valve Sizes and configurations that are UL listed or FM approved. Consult
the factory or your nearest sales representative if further clarification is required.

UL listed and FM approved products are identified by the appropriate nameplate on
the Valve. Drawings of the UL & FM nameplates are enclosed for reference.
The UL nameplate drawing number 86060. The FM nameplate drawing number is 94777.
This manual contains information regarding care, installation and maintenance of
the Roll Seal Main Valve (100-42) as well as information about the fully piloted prod­uct (750B-4KG1 Fire Pump Relief Valve). 100-42 is the identifying nomenclature for
the Main Valve. 750B-4KG1 is identifying nomenclature for the fully piloted Fire Pump
Relief Valve Assembly. See Schematic Drawing No. 29868 for clarification of the com­ponent nomenclature and for a description of Valve Operation.

A capacity flow curve for Valve sizes 3" through 10" is included that shows the flow
capacity in the full open valve condition.

Cla-Val recommends that 750B-4KG1 Valves be tested after installation to verify the
Relief pressure set point.

INSTALLATION / OPERATION / MAINTENANCE

Model 100-42 Valve

in Closed Position

Upstream pressure is introduced to the
control chamber (the chamber formed
behind the liner) through the control
piping and restrictor. When the pilot is
closed, full inlet pressure is supplied to
the control chamber, thus balancing the
force developed by inlet pressure act­ing on the upstream face on the liner.
Under these conditions, the liner
remains in the fully closed position.

Since the operating pressure in the
control chamber is greater than the out­let pressure, an additional closing force
is developed across the liner, pressing
the liner against the surrounding slotted
grillwork area and seating surface.

Model 100-42 Valve

in Partially Open Position

As loading pressure is lowered slightly
below inlet pressure, the central portion
of the liner is forced to invert and come
to rest against the tip of the control
chamber cavity. Reducing the loading
pressure further (but still higher than
outlet pressure) causes the liner to
drape over the cone shaped portion of
the control chamber cavity. This action
causes the outer section of the liner to
roll off the seating surface and a portion
of the grillwork to partially open the
valve.

Model 100-42 Valve

in Fully Open Position

The valve is fully opened when loading
pressure is sufficiently reduced to allow
the liner to roll back completely and
expose the full slot area. Restoring
loading pressure reverses the liner
rolling action to return the liner to the
fully closed position.

DESCRIPTION

PRINCIPLE OF OPERATION

PILOT
CONTROL
VALVE

RESTRICTOR

SEATING AREA

CONTROL CHAMBER

INLET

Pilot
Control
Valve

RESTRICTOR

SEATING AREA

CONTROL CHAMBER

INLET

Pilot
Control
Valve

RESTRICTOR

SEATING AREA

CONTROL CHAMBER

INLET

100-42

The Cla-Val Model 100-42 Roll Seal valve
is a hydraulically operated valve used to
control liquid flow by means of a flexible
control element, the liner.

The basic valve consists of only two parts:
a one piece, investment cast body and an
elastomeric liner. The valve body is con­structed with internal ribs and slots forming
a grillwork which surrounds the liner to pro­vide support. A normally closed type valve
is formed by the installed liner which covers
the grillwork and seats against the raised
seating surface in the valve body.

Upstream pressure actuates the valve to
produce valve opening by rolling the liner off
the seating surface and the slotted grillwork.

The valve is actuated by upstream pressure
as the loading pressure (pressure supplied
to the control chamber) is varied by an
external pilot control system.

A typical pilot control system used to oper­ate the Model 100-42 valve consists of a
restriction and a suitable pilot connected to
the valve.

700 Series Roll Seal

SERIES

The Model 100-42 valve in 6" through
12" sizes are constructed with separa­ble "slip-on" style flanges. Furnished
standard in either class 150 or 300
raised face type, the flanges are
removable and interchangeable. The
class 150 flange may be bolted up to
class 125 pipeline flanges and the
class 300 flange may be mated
against a class 250 flange.

Locate pilot system port connections
at the top of valve in pipeline to allow
easy air venting. A line size strainer is
recommended, mounted on the valve
inlet.

The valve should be given a visual inspec­tion before installation to be sure no foreign
materials have collected inside the valve
during shipment or storage.

Pipelines should be flushed out before the
valve is installed in the system. New sys­tems, especially, should be cleaned as con­taminates such as welding beads, scale,
rocks, etc. are commonly contained within
the pipeline.

The valve should be installed in a location
allowing sufficient working space around
the valve to provide easy access for main­tenance and removal for servicing.

For 2", 3", and 4" sizes only. Insert the lower
half pattern of stud bolts through the bolt
holes of the upstream and downstream
pipeline flanges.

For 2" & 3" valves only. The 125 and 150
series flanges use a different number of
bolts than the 250 and 300 series flanges.
Hence, the wafer valve body configuration
is inherently self centering regardless of the
flange used.

Install the valve between the flanges being
sure to include the appropriate flange gas­kets between each end of the valve and the
mating pipe flange.

Note: The valve must be installed with the
flow arrow on side of body pointing to the
downstream piping section. Cla-Val 700
Series valves may be installed in any posi­tion in either vertical or horizontal installa­tions without any effect on valve operation.

Insert the remaining stud bolts and nuts and
tighten evenly using a diagonal cross-over
type pattern.

For the 4'' valve, ANSI pipe flanges use an
8 bolt pattern regardless of pressure rat­ings, although the 250 and 300 series use
larger bolts on a larger bolt circle. The 4"
valve can be centered in the larger 250 and
300 class flanges by rotating the valve body
into full radial contact with the bolt studs
prior to tightening.

INSTALLATION

PROCEDURE

2.

3.

4.

4a.

6.

7.

1.

Gasket

Gasket

Recommended Strainer

Model 100-42 Roll Seal Valve

The Cla-Val Model 100-42 Roll Seal
valve in 2", 3", and 4" sizes are
designed to mount between standard
pipe flanges (ANSI 125, 150, 250, and
300 series) as a wafer type valve. The
outer portion of the valve body is con­structed with fluted (recessed) sec­tions to provide clearance for the class
125 and 150 flange bolt pattern while
the basic outside diameter of the body
centers within the class 250 and 300
flange bolt pattern.

If an inline basket type strainer is to be
included in the installation, insert the strain­er into the upstream pipe, making sure a
gasket is placed between the strainer and
the upstream flange.

4b.

5.

Liner Retainer Removal 2"-12" Sizes

The 2" and 3" liner retainer is secured to the valve with an Allen
screw. Loosen the Allen screw, pull the locking pin back towards
center of retainer, and remove the retainer from valve.

To install, insert the retainer, (do not block inlet feed hole), push
locking pin into position and tighten Allen screw.

The 4"-12" liner retainers are secured with a snap ring. Remove
the snap ring and retainer.

To install, insert retainer and install snap ring into the groove of
valve. Be sure snap ring is completely inserted into groove.

Liner Removal 2"-12" Sizes

The tool used for removal should be free of sharp edges to pre­vent damage to the liner, the valve body seat or control cham­ber surfaces. A motorcycle tire iron or similar tool works well.

1. Insert the tool between the liner and the valve body as
deeply as possible.

2. Using the seat edge as a fulcrum, rock the end of the tool
away from the valve in a manner to pull the liner bead out of the
body. Grasp the liner and remove from the valve body.

Liner Installation 2", 3", 4" Sizes

Thoroughly clean out the interior of the valve body control cham­ber cavity.

Liberally apply glycerine inside the control chamber cavity and
around the seal bead area of the liner.

DO NOT USE ANY HYDROCARBON OR SILICONE BASED
LUBRICANTS ON LINERS AS THESE COMPOUNDS CAN
SEVERELY ATTACK THE LINER MATERIAL.

3. Fold the liner as shown and install into the valve body con­trol chamber as deeply as possible.

4. Continuing to force the liner into the control chamber cavity,
again fold the liner as shown to insert the liner seal bead section
under the valve body seat surface.

5. Work the folded section of the liner into place by pushing
against the folded area to slide the seal bead down the conical
face of the control chamber.

Liner Seating Instructions 2", 3", 4" Sizes

After installing the liner, it must be seated over the manifold ring
in the valve body. The objective of this seating procedure is to
place the inside lip of the liner over the outside lip of the mani­fold ring.

6. 4" valve with liner installed.

7. Pinch, pull and knead the liner 360° around to seat the liner
on the manifold ring.

8. Using a dull tool or hammer handle, pry the outer part of the
liner towards the center to help "seat" the liner.

9. Now push the liner down into the valve, holding your hand
on the depressed liner, seal off the loading port with your finger.

10. Remove your hand from liner and continue holding your fin­ger over the loading port. If liner is seated, it will be held in the
open position as long as your finger is over the loading port.
When you release your finger, the liner will popup. If not seated,
repeat with Step 7.

Install liner retainer into body.

1

3

5

7

9

2

4

6

8

10

Liner Installation
6", 8", 10", 12" sizes

1. Tools required: Bottle of drugstore glycerine,
30" crowbar, double headed plastic hammer
with 14" handle, rubber mallet and large flat
blade screwdriver.

2. Liberally wipe glycerine on the inside of the
valve and on the outer edge of the liner. Fold
liner in half and insert into valve body.

3. Push liner in as far as possible forcing it out side
ways.

4. Place the crowbar at the upper 25% point of the
liner. Take your other hand and push on nose of liner
to bend the liner over the crowbar. The less material
folded over, the easier it will go into the valve. If too
much is folded over, it will be difficult to complete
liner installation.

5. Continue bending liner nose down into the valve.
Use your hands and/or hammer handle to continue
forcing it down into valve. It is important to keep the
"V" of the bend near the 25% point. If it goes over
the center, The liner won't go in, and it will be nec­essary to start over at Step 3.

6. Use the hammer to force the liner down and out into
the valve body.

7. Use the hammer handle for the final insertion.
Sometimes it is helpful to beat on the liner with the
hammer for the final step.

8. To seat the liner on the manifold ring use the ham­mer handle to push down on the liner near bore of
valve inlet and pry handle and liner towards the cen­ter. Continue this prying action for 360° around the
liner for proper seating.

9. To test for liner seating, push down on the center of
liner and close the loading port shut-off cock, or
block it with your hand. When you release your hand
from the liner, it should remain in the down position
until the loading port is opened.

10. If liner appears seated, open loading port cock and
liner should pop-up to the closed position. Repeat
Steps 6-10 if liner is not seated.

When the liner is fully seated, the inside diameter of
the liner will be seated over the outside diameter of
the manifold ring. The manifold ring is a raised circu­lar ridge at the bottom of the open cavity which pro­vides for even distribution of the fluid coming in and
going out the loading port.

Install liner retainer into body.

1

3

5

7

9

2

4

6

8

10

Relief Valve Applications 750
Series Valves

The following instructions are for valves
equipped with a Model CRL Pressure
Relief Pilot Control.
Due to the nature of intended use, the
system being protected with the relief
valve will most likely not be able to fur­nish the pressure source needed to
establish the proper setpoint of the pilot
control. Due to this fact, in most
instances, the relief valve setting proce­dures will either have to be carried out at
other locations or an auxiliary pressure
source will have to be supplied at the
site in order to carry out the following
procedure.
Remove the adjustment cap and
increase tension on the range spring by
means of the adjustment screw (turn
clockwise) until maximum spring load is
attained.
Slowly introduce inlet pressure to the
valve at the desired setpoint value.
Bleed all air.
Gradually decrease tension on the
range spring by means of the adjust­ment screw (turn counterclockwise) until
flow is initiated through the valve.
Reduce system pressure back to normal
value. Tighten the adjustment screw
lock nut and replace the adjustment cap.
The valve is now ready for service.

In most instances, the 700 Series Cla-Val
Control valves will be shipped complete
with a pilot control system mounted on the
Model 100-42 valve. Consult the appropri­ate start up and operation instructions for
the pilot control used before pressurizing
the system.

IT IS IMPORTANT THAT THE PRESSURIZA­TION AND DEPRESSURIZATION OF ALL
INSTALLATIONS BE CARRIED OUT IN A MAN­NER TO PREVENT IMPOSING A REVERSE
PRESSURE CONDITION ON THE CLA-VAL
MODEL 100-42 VALVE. PRESSURIZATION OF
THE SYSTEM SHOULD BE ACCOMPLISHED
BY PRESSURIZING THE INLET SIDE FIRST.

DEPRESSURIZATION OF THE SYS­TEM SHOULD BE ACCOMPLISHED BY
DEPRESSURIZING THE OUTLET SIDE
FIRST. FAILURE TO FOLLOW THIS
PROCEDURE COULD RESULT IN DIS­LODGEMENT AND/OR DESTRUCTION
OF THE RUBBER LINER.

Pressure Reducing
790 Series Valves

The following instructions are for
valves equipped with a Model CRD
Pressure Reducing Pilot Control.
Remove the adjustment cap and back
off adjustment screw setting (turn
counterclockwise) of the CRD
Pressure Reducing Pilot Control to fully
relieve all loading on the range spring.
Slowly open the upstream main line
block valve to pressurize the inlet sec-
tion of the valve.
Bleed any entrapped air from the con­trol chamber of the valve and tubing
sections by loosening fittings at the
highest points. Retighten fittings.
Install gauge on downstream port of
CRD.
Slowly increase tension on the range
spring, by means of the adjustment
screw (turn clockwise) until the desired
downstream pressure is attained. Use
a gauge.
Open the downstream main line block
valve.
If required, reset the pilot adjustment
screw setting to obtain the downstream
pressure desired.
Tighten the adjustment screw lock nut
and replace the adjustment cap.

Back Pressure Control
750 Series Valves

The following instructions are for
valves equipped with a Model CRL
Back Pressure Pilot Control.
Remove the adjustment cap and
increase tension on the range spring,
by means of the adjustment screw
(turn clockwise) until maximum
spring load is attained.
Slowly open the upstream main line
block valve to pressurize the inlet
section of the valve.
Bleed any entrapped air from the
control chamber of the valve and tub­ing sections by loosening fittings at
the highest points. Retighten fittings.
Open the downstream main line
block valve.
Gradually decrease tension on the
range spring by means of the adjust­ment screw (turn counterclockwise)
until upstream pressure decreases to
the desired setpoint.
Tighten the adjustment screw lock
nut and replace the adjustment cap.

PLACING VALVE INTO OPERATION

START-UP INSTRUCTIONS

Vent the upstream section to fully relieve
pressure in the inlet section and control cham­ber of the Model 100-42 valve.
If the valve liner is to be inspected or
replaced, remove the valve from the main line.

The following procedure should be followed
when taking the Model 100-42 valve out of
service.

Close the upstream main line block valve
first. Then close the downstream main line
block valve.
Vent the downstream section to fully relieve
pressure in the outlet section of the valve.

Taking Valve Out of Service

1.

2.

3.

4.

Important Procedure for All Installations:

1.

2.

3.

4.

5.

6.

7.

1.

2.

3.

4.

5.

6.

1.

2.

3.

4.

2 1/2 Pipe Diameters

Min Recomended

Length Spool

2

1

OUTLE

T

Recommended Pipe layout

6" - 12" Flange style 100-42

2 Pipe Coupling (Rubber Gasket Type)
1 100-42 Main Valve, Flange X Flange

2 1/2 PIPE DIAMETERS

MIN RECOMENDED

LENGTH SPOOL

INLET

INLET

OUTLE

T

OUTLE

T

3

4

1

2

Roll Seal

®

™

Roll Seal

®

™

1 COUPLER FOR GROOVED PIPE
2 SPOOL STRAINER ASSEMBLY (WITH CONE)
3 100-42 MAIN VALVE, GROOVE X FLANGE
4 100-42 MAIN VALVE, GROOVE X GROOVE

Recommended Pipe layout

6" - 12" Grooved style 100-42

Item

No.

No.

Req'd

Material

(Standard)

Description

1
2*
3
4
5
6
7
8

Body
Liner
Nameplate
Drive Screw
Liner Retainer
Retaining Ring
Slip-on Flange
Flange Retainer Ring

1
1
1
2
1
1
2
2

316L Stainless Steel "L"
Natural Rubber
Aluminum
18-8 Stainless Steel
316L Stainless Steel
316L Stainless Steel
Steel-Cad. Pl.
Steel-Cad. Pl.

*Recommended Spare Part

4" Wafer Style Valve 2-3" Wafer Style Valve 6"-12" Flanged Valve

6

5

5

1

2

3

4

5

6

4

3

2

8

7

1

When ordering
please specify:

• All nameplate data

• Description

• Part Numbers

• Item Number

• Material

CLA-VAL

Copyright Cla-Val 2014 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

N-100-42 (R-3/2014)

PRESSURE RELIEF CONTROL

CRL5A

MODEL

INSTALLATION / OPERATION / MAINTENANCE

CLA-VAL

Copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

N-CRL5A (R-3/2011)

DESCRIPTION

The CRL5A Pressure Relief Control is a direct-acting, spring-loaded, di­aphragm-type relief valve. It may be used as a self-contained valve or as a
pilot control for Cla-Val valves. It opens and closes within very close pres­sure limits.

INSTALLATION

The CRL5A Pressure Relief Control may be installed in any position.
CRL5A body (7) has one inlet and one outlet ports with two smaller side
ports. Side ports are for control connections or gauge installation. A flow
direction indicator is cast into body. Control pressure sensing is through
small side port in powerunit (6).

OPERATION

The CRL5A Pressure Relief Control is normally held closed by compres­sion spring force above diaphragm, and controlling pressure is applied
under diaphragm. When controlling pressure exceeds spring setting, con­trol disc is lifted off its seat permitting flow through the control. When con­trolling pressure drops below spring setting, spring returns control to
normally closed position.

ADJUSTMENT PROCEDURE

The CRL5A Pressure Relief Control can be adjusted to provide relief set­ting at any pressure within the range found on nameplate. Provision
should be made for pressure gauge at CRL5A sensing point.

Pressure adjustment is made by first loosening jam nut (10) and turning
adjustment screw (9) to vary spring pressure on diaphragm. Turning ad­justment screw clockwise increases pressure required to open control.
Counterclockwise decreases pressure required to open control.

When pressure adjustments are complete tighten jam nut (10) and replace
protective cap (1). If there is a problem of tampering, lock wire holes are
provided in cap and cover. Wire cap to cover and secure with lead seal.

DISASSEMBLY

The CRL5A Pressure Relief Control does not need to be removed from
pipeline for disassembly and service. Make sure that CRL5A system pres­sure is shut down and bleed off before beginning disassembly. If CRL5A is
removed from pipeline for disassembly, be sure to use a soft jawed vise to
hold body (7) during work.
Refer to Parts List Drawing for Item Numbers.

1. Remove cap (1), loosen jam nut (10) and turn adjusting screw (9)
counterclockwise until spring tension is relieved.

2. Remove eight screws (4) holding cover (3), and powerunit (6) to
body (7). Note orientation of powerunit sensing port and cover
relative to control body for correct reassembly. Hold cover (3) and
powerunit together, remove from body (7) and place on suitable work
surface.

3. Remove cover (3) from powerunit (6). Remove spring (12) and two
spring guides (11) from cover (3). Thinner spring guide should be on
spring top.

4. Carefully unthread upper diaphragm washer (15) from stem (19) and
remove. Remove diaphragm (16), lower diaphragm washer (17), and
upper stem O-ring (5).

5. Pull stem (19) with lower disc assembly attached through bottom of
powerunit. .

6. 6. Unscrew and carefully remove large hex disc retainer (21) and
remove disc assembly (23) from bottom of stem. Use soft jaw pliers
or vise to hold stem. The polished surface of stem must not be
scored or scratched, because o-ring leaks will occur.

7. The seat (22) need not be removed unless it is damaged. If removal
is necessary use proper size socket wrench and turn counterclock­wise. NOTE: some models have integral seat in body.

INSPECTION

Inspect all parts for damage, or evidence of cross threading or leaking.
Check all rubber parts for tears, abrasions or other damage. Check all
metal parts for damage, corrosion, or excessive wear.

REPAIR AND REPLACEMENT

Minor nicks and scratches on metal parts may be polished out using water
and 400 grit (or finer) wet or dry sandpaper. CRL5A Repair kit p/n 20666E
consists of all rubber parts should be installed. When ordering replace­ment metal parts or repair kits, be sure to include all nameplate data and to
specify desired item description and item number.
Refer to Parts List for Item Numbers.

REASSEMBLY

In general, reassembly is reverse of disassembly steps. However, follow­ing steps should be followed.

1. Check that all parts are clean and in good condition before reassembly.

2. Before installing O-rings, lubricate them with waterproof grease (Dow
Corning 44 medium grade or equal).

3. Use grease very sparingly and install stem seal O-ring (18) in powerunit
(6).

4. Use soft jaw pliers or vise to hold stem (19) with large bottom end
facing up. Place disc assembly (23) with rubber facing up, on stem
bottom. Thread large hex disc retainer (21) onto stem (19) to hold disc
assembly (23) in place. Tighten large hex disc retainer (21) until snug
and rubber disc (23) remains flat. Do not overtighten.

5. Use grease very sparingly and install upper stem O-ring (5) on stem.
Install stem (19) from below through powerunit. Use a rotating motion
with slight pressure to let stem pass through O-ring without damage.
Do not cut O-ring with stem.

6. With stem (19) all the way up, place lower diaphragm washer (17) on
stem with serrated side up. Place diaphragm (16) on stem, then upper
diaphragm washer (15). Tighten upper diaphragm washer (15) onto
stem (19) until snug.

7. Position powerunit (6) with stem assembly on body (7). Locate
powerunit (6) sensing port as shown on parts list drawing.

8. Continue reassembly in reverse of disassembly steps 1, 2, and 3.

Note: Before 1985, high-pressure design CRL5A controls used different
spring and spring guides that created a pre-load on assembly. During dis­assembly, four regular screws were removed first. Then four longer screws
were used to “push” assembly apart. During reassembly, four longer
screws were used to “pull” assembly together. Then remaining four regular
screws were installed. Now with new spring and spring guides, eight regu­lar screws (4) are used and control does not have pre-load to overcome.

SYMPTOM PROBABLE CAUSE REMEDY

Fails to open. Controlling pressure

too low.

Back off adjusting
screw until valve
opens.

Fails to open with
spring compression
removed.

Mechanical obstruc­tion, corrosion, scale
build-up on stem.

Disassemble, lo­cate,and remove ob­struction, scale.

Leakage from cover
vent hole when con­trolling pressure is ap­plied.

Diaphragm Damage Disassembly replace

damaged di­aphragm.

Fails to close with
spring compressed.

Mechanical obstruc­tion.

Disassemble, locate
and remove ob­struction.

Fails to close. No spring compres-

sion.

Re-set pressure ad­justment.

Loose diaphragm as­sembly.

Tighten upper di­aphragm washer.

CRL5A

PRESSURE RELIEF CONTROL

CLA-VAL

Copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

PL CRL5A (R-3/2011)

PARTS LIST

Item No. Description Qty 15 Washer, Diaphragm, Upper (Threaded Hole) 1

1 Cap 1 16 Diaphragm 1

2 Nameplate 1 17 Washer, Diaphragm, Lower 1

3 Cover 1 18 O-Ring (Stem Seal) 1

4 Screw, Fil HD 8 19 Stem 1

5 O-Ring (Stem, Upper) 1 20 O-Ring (Body) 1

6 Body, Powerunit 1 21 Retainer, Disc (Hex) 1

7 Body 1 22 Seat 1

8 O-Ring (Seat) 1 23 Disc Assembly 1

9 Screw, Adjusting 1 24 Plug, Pipe 2

10 Nut, Jam 1 26 Guide, Spring, Lower (For Low Pressure Design Only) 1

11 Guide, Spring A/R Repair Kit # 20666E includes:

12 Spring 1 (Buna-N®, Diaphragm,Disc Assembly, O-rings)

CRL5A

Range PSI

Approximate Increase for

Each Clockwise Turn of

Adjusting Screw

(Item No. 9)

0 - 75 8.5 PSI

5 - 25 4.0 PSI
20 - 105 13.0 PSI
20 - 200 28.0 PSI

100 - 300 19.0 PSI

Capacity Information

700 Series

MODEL

1
1

However, the above stated relationship only remains valid if the flowing conditions are both turbulent
(non-viscous) and non-cavitating. Fortunately, these conditions are the most common encountered in
liquid flow applications. In those cases where viscous or cavitating

(1)

flow conditions are possible,

consult factory for guidance in selection of valve size.

Example:

Determine the maximum flow rate capability of a 4" Cla-Val Roll Seal valve in fresh water service with
an upstream pressure of 90 psi and downstream pressure of 77 psi. From table, a 4" Cla-Val 700
Series valve has a full open C

v

factor of 128; hence:

Valve Sizing Coefficient - C

v

A very useful expression often used in determining the head loss and/or flow rate capacity of control
valves is the Cvfactor. Commonly referred to as the flow coefficient or valve sizing coefficient, this

empirically determined factor describes the flow capacity of a valve.
The C

v

factor is defined as the number of U.S. gallons per minute of water (at 60°F flowing temperature)

discharged through a flow restriction with a head loss of one psi. In the case of a control valve, the C

v

value is normally stated for the valve in the fully open position. For conditions other than full open, (i.e.
modulating valves), contact Cla-Val Technical Services.

Cla-Val 700 Series Valves - Full Open C

v Factors

Liquid Flow Equation

The basic flow to pressure drop relationship for liquid service is expressed by the formula:

Q = 128 = 128 (3.61) = 462 GPMx

13

or

Q = Flow rate in U.S. gallons per minute (GPM).
C

v

= Valve sizing coefficient.
∆P = Head loss across valve in psi.
G = Specific gravity of liquid at flowing temperature referred to

water (1.0) at standard conditions (60°F).

Where:

(1) Note: For further information on cavitation, see technical data sheet "RS-Cavitation".

Q = C

v

Q = C

v

x

∆P

G

∆P

or

1

G

Valve Size 2" 3" 4" 6" 8" 10" 12"
Cv Factor

48 84 128 451 764 1443 2048

N-RS-Capacity (R-8/00)

Specific Gravity Correction Table

Maximum Continuous Flow (U.S. GPM)

Specific

Gravity

"G"

Correction

Factor 1

G

0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.30 1.40

1.15 1.12 1.08 1.05 1.03 1.00 0.98 0.95 0.93 0.91 0.88 0.85

To obtain flow capacity of a liquid other than water (specific gravity of 1.00), multiply water flow capacity obtained by the
appropriate specific gravity correction factor.

NOTE: The flow rate vs. head loss data presented here is based on a fully open valve condition. The maximum

recommended velocity is 20 ft./sec.

Valve Size

Maximum

Continuous

Flow

2" 3" 4" 6" 8" 10" 12"

224 469 794 1787 3177 4964 7148

3"

4"

10000100010010

1

10

100

2" THRU 12" ROLL SEAL FLOW CURVES

STANDARD VERSION WITH LINER RETAINER

(COVER TO ATMOSPHERE)

FLOW (GPM)

PRESSURE DROP (PSI)

10"8"6"

2"

12"

THREADED 3/8" 18 NPT
(TYP. BOTH ENDS)

A

Restriction Pipe Fitting

X58A

When ordering parts,
please
specify:

• All Nameplate Data

• Description

•Size

Part No. Material "A"

Orifice Dia.

74894-07C Brass 3/32" (.093)

74894-06E 303 SS 1/16" (.062)

74894-05G Brass 1/16" (.062)

74894-04K 303 SS 1/8" (.125)
74894-03B Brass 1/8" (.125)

CLA-VAL

Copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

pl-x58A (R-3/2011)

PARTS LIST

A

2.50

A

2.75

SECTION

AA

3/8 N.P.T.

1.25

1.50

3/8 N.P.T.
BOTH ENDS

6

5

4

1

3

2

8

7

Outlet

Inlet

Flow

1. Cover Screw (8 Required)

2. Cover

*3. Spring

4. Diaphragm Washer
*5. Diaphragm
*6. Disc Retainer Assembly

7. Body Plug (3/8 NPT)

8. Body (Threaded)

ITEM DESCRIPTION

When ordering

parts, please

specify:

• All nameplate data

• Description

• Part Number

• Item Number

• Material

*Recommended Spare Parts

3/8" Check Valve

81-01

PARTS LIST

2

10

7

6

9

11

3
5

1
4

8

3.50

.56

2.56

FLOW

OUTLETINLET

3.12 DIA

ITEM DESCRIPTION

When ordering

parts, please

specify:

• All nameplate data

• Description

• Part Number

• Item Number

• Material

*Recommended Spare Parts

1/2" & 3/4 Check Valve

81-01

CLA-VAL

Copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

PL-81-01 (R-3/2011)

PARTS LIST

1. Body 1

2. Cover 1

*3. Diaphragm 1

4. Guide Disc 1

*5. Disc Retainer Assembly 1

7. Nut Hex 3/8 - 24UNF 28 1

8. Plug Pipe Hex NPT 2

9. Screw, Fil HD 10 32UNF 2 x 2LG 8

10. Spring 1

11. Nameplate 1

1

2

3

4

5

3/8 NPT

Strainer

X43

Standard 60 mesh pilot system strainer for fluid service.

CLA-VAL

Copyright Cla-Val 2012 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©

PL- X43 (R-9/2012)

PARTS LIST

ITEM DESCRIPTION MATERIAL

1

Pipe Plug Steel

2

Strainer Plug Brass

3

Gasket Copper

4

Screen SST

5

Body Brass

No parts available. Rreplacement assembly only.

Size Stock Number

3/8 x 3/8 33450J

CLA-VAL

©

copyright Cla-Val 2011 Printed in USA Specifications subject to change without notice.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

How to Order

Roll Seal

¤

TM

CLA-VAL

How To Order

There are man y v alves and con­trols manufactured by Cla-Val. that
are not listed due to the sheer v ol­ume. For inf ormation not listed,
please contact y our local Cla-V al
representative.

Specify when
ordering

• Model Number

• Adjustment Range
(As Applicable)

• Valve Size

• Optional Features

• Pressure Class

Unless Otherwise
Specified

• X43 “Y” Strainer is
included.

• CK2 Isolation Valves is
included in price on 6" and
larger valve sizes.

Limited Warranty

Automatic valves and controls as man ufactured by Cla-Val are
warranted for one year from date of shipment against man ufac­turing defects in material and workmanship which develop in the
service for which the y are designed, pro vided the products are
installed and used in accordance with all applicab le instr uc­tions and limitations issued b y Cla-Val.

We will repair or replace defective material, free of charge, which
is retur ned to our f actory, tr ansportation charges prepaid, pro­vided that, after inspection, the mater ial is f ound to ha ve been
defective at time of shipment. This warranty is expressly condi­tioned on the purchaser’ s giving Cla-V al immediate wr itten
notice upon discovery of the defect.

Components used b y Cla-Val but man ufactured b y others , are
warranted only to the extent of that man ufacturer’s guarantee.

This warranty shall not apply if the product has been altered or
repaired b y others , and Cla-V al. shall mak e no allo wance or
credit for such repairs or alterations unless authorized in writing
by Cla-Val.

750B-4KG1

Product Identification

Proper Identification

For order ing repair kits , replacement par ts, or f or
inquiries concer ning v alve oper ation it is impor tant to
properly identify Cla-V al products already in ser vice.
Include all nameplate data with y our inquiry. Pertinent
product data includes v alve function, siz e, mater ial,
pressure rating, end details, type of pilot controls used
and control adjustment r anges.

Identification Plate

For product identification, cast in body mar kings are
supplemented b y the identification plate illustr ated on
this page . The plate is mounted in the most pr actical
position. It is extremely important that this identifi-

cation plate is not painted over, removed, or in any
other way rendered illegible.

N-750B-4KG1 P.I.D.

Terms Of Sale

ACCEPTANCE OF ORDERS

All orders are subject to acceptance b y our main office at
Newport Beach, California.

CREDIT TERMS

Credit terms are net thirty (30) days from date of in voice.

PURCHASE ORDER FORMS

Orders submitted on customer’s own purchase order forms will be
accepted only with the e xpress understanding that no statements ,
clauses, or conditions contained in said order f orm will be binding
on the Seller if the y in any way modify the Seller’s own terms and
conditions of sales.

PRODUCT CHANGES

The right is reser ved to make changes in pattern, design or mate­rials when deemed necessary, without prior notice.

PRICES

All pr ices are F .O.B. Newport Beach, Calif ornia, unless e xpressly
stated otherwise on our ac knowledgement of the order. Prices are
subject to change without notice . The prices at which any order is
accepted are subject to adjustment to the Seller’s price in effect at
the time of shipment.Prices do not include sales, excise, municipal,
state or an y other Go vernment tax es. Minimum order charge
$75.00.

RESPONSIBILITY

We will not be responsib le for dela ys resulting from str ikes, acci­dents, negligence of carr iers, or other causes be yond our control.
Also, we will not be liab le for any unauthorized product alter ations
or charges accruing there from.

Disclaimer Of Warranties And
Limitations Of Liability

The foregoing warranty is exclusive and in lieu of all other
warranties and representations, whether expressed,
implied, oral or written, including but not limited to any
implied warranties or merchantability or fitness for a partic­ular purpose. All such other warranties and representations
are hereby cancelled.

Cla-Val shall not be liable for any incidental or consequential
loss, damage or expense arising directly or indirectly from
the use of the product. Cla-V al shall not be liable for any
damages or charges for labor or expense in making repairs
or adjustments to the product. Cla-Val shall not be liable for
any damages or charges sustained in the adaptation or use
of its engineering data and services. No representative of
Cla-Val may change any of the foregoing or assume any
additional liability or responsibility in connection with the
product. The liability of Cla-Val is limited to material replace­ments F.O.B. Newport Beach, California.

Risk

All goods are shipped at the risk of the purchaser after they have been
delivered by us to the carrier. Claims for error, shortages, etc., must be
made upon receipt of goods.

EXPORT SHIPMENTS

Export shipments are subject to an additional charge for export packing.

RETURNED GOODS

1. Customers must obtain written approval from Cla-Val prior to return­ing any material.

2. Cla-Val reserves the right to refuse the return of any products.

3. Products more than six (6) months old cannot be returned for cred­it.

4. Specially produced, non-standard models cannot be returned for
credit.

5. Rubber goods cannot be returned for credit, unless as part of an
unopened repair kit which is less than six months old.

6. Goods authorized for return are subject to a 35% ($75 minimum)
restocking charge and a service charge for inspection, recondition­ing, replacement of rubber parts, retesting and repackaging as
required.

7. Authorized returned goods must be packaged and shipped prepaid to
Cla-Val., 1701 Placentia Avenue, Costa Mesa, California 92627-

4475.

N-750B-4KG1 P.I.D.

P.O. Box 1325 • Newport Beach, CA 92659-0325 • Phone: [phone] • Fax: [phone] • E-mail: [e-mail] • Website cla-val.com

©copyright Cla-Val 2000 Printed in USA Specification subject to change without notice.

CLA-VAL

INSTALLATION / OPERATION / MAINTENANCE

Repair Kits

When ordering, please give complete nameplate data of the valve and/or control being repaired.

MINIMUM ORDER CHARGE APPLIES.

750B-4KG1

N-750B-4KG1 RSRK (R-11/99)

3" 4" 6" 8" 10"

Nitrile
70 Durometer

R2002302E R2002303C R2002304A R2002305H R20012306F

Nitrile
70 Durometer

R940107 R940207 R940307 R940407 R940507

The Cla-Val 700 Series valve repair kit for the 750B-4KG1 is the only recommended spare part. The valve
series is highly reliable due to fewer parts to create problems.

Valve repair kits are recommended over individual liner sales. Kits offer all essentials for easy installation to
include: liner, lubricant, liner retainer hardware, and instructions.

LINER PART NUMBERS:

(FOR UL LISTED 750B-4KG1 VALVE ASSEMBLY

REPAIR KIT PART NUMBERS:

(FOR UL LISTED 750B-4KG1 VALVE ASSEMBLY

Roll Seal

®

™

REPAIR KIT PART NUMBERS:

2" 3" 4" 6" 8" 10" 12"

Natural Rubber
65 Durometer

EPDM
70 Durometer

Nitrile
70 Durometer

Silicone
70 Durometer

Viton
70 Durometer

R2001501A R2001502A R2001503J R2001504G R2001505A R2001506A R2001507K

R2002201J R2002202G R2002203E R2002204C R2002205K R2002206H R2002207F

R2002301G R2002302E R2002303C R2002304A R2002305H R20012306F R2002307D

R2001401F R2001402D R2001403B R2001404K R2001405G R2001406E R2001407C

R2002101A R2002102J R22002103G R2002104E R2002105A R2002106K R2002107H

LINER PART NUMBERS:

2" 3" 4" 6" 8" 10" 12"

Natural Rubber
65 Durometer

EPDM
70 Durometer

Nitrile
70 Durometer

Silicone
70 Durometer

Viton
70 Durometer

R940001 R940101 R940201 R940301 R940401 R940501 R940601

R940006 R940106 R940206 R940306 R940406 R940506 R940606

R940007 R940107 R940207 R940307 R940407 R940507 R940607

R940003 R940103 R940203 R940303 R940403 R940503 R940603

R940005 R940105 R940205 R940305 R940405 R940505 R940605