CLA-VAL 50B-4KG1, 2050B-4KG1, CRL-60 Installation, Operation And Maintanance

INSTALLATION / OPERATION / MAINTENANCE

MODEL

50B-4KG1/2050B-4KG1

The Cla-Val Model 50B-4KG1 Globe /2050B-4KG1 Angle
Pressure Relief Valve is designed specifically to automatically
relieve excess pressure in fire protection pumping systems. Pilot
controlled, it maintains constant system pressure at the pump dis­charge within very close limits as demands change.
The Fire Pump Pressure Relief Valve shall modulate to relieve
excess pressure in a fire protection system. It shall maintain con­stant pressure in the system regardless of demand changes. It
shall be pilot controlled and back pressure shall not affect its set
point. It shall be actuated by line pressure through a pilot control
system and open fast in order to maintain steady system pressure
as system demand decreases. It shall close gradually to control
surges and shall re-seat drip-tight within 5% of its pressure setting.

INSTALLATION

1. Allow sufficient room around the valve assembly to make

adjustments and for servicing.

2. lt is recommended that gate or block valves be installed to
facilitate isolating valve for preventative maintenance. When used
as a surge control or pressure relief valve where valve outlet dis­charge is to atmosphere, then a gate or block valve is needed at
valve inlet. When used as a back pressure sustaining control
valve where valve outlet is connected to pressurized downstream
system, then gate or block valves are needed at valve inlet and
outlet.

NOTE: BEFORE THE VALVE IS INSTALLED, PIPE LINES
SHOULD BE FLUSHED OF ALL FOREIGN MATTER.

3. Place valve in line with flow through valve in direction indicated

on inlet plate or flow arrows. Check all fittings and hardware for
proper makeup and verify that no apparent damage is evident.

4. Cla-Val Valves operate with maximum efficiency when mounted
in horizontal piping with the cover UP; however, other positions are
acceptable. Due to size and weight of cover and internal components
on six inch and larger valves, installation with the cover up is
advisable. This makes periodic inspection of internal parts readily
accessible.

5. Caution must be taken in the installation of this valve to insure that

galvanic and/or electrolytic action does not take place. The proper use
of dielectric fittings and gaskets are required in all systems using dis­similar metals.

Pressure Relief Valve

MAINTENANCE

1. Cla-Val Valves and Controls require no lubrication or packing

and a minimum of maintenance. However, a periodic inspection
schedule should be established to determine how the fluid is
affecting the efficiency of the valve assembly. Minimum of once
per year.

2. Repair and maintenance procedures of the Hytrol Main Valve
and control components are included in a more detailed Tech
Manual. It can be downloaded from our web site (www.cla-val.com)
or obtained by contacting a Cla-Val Regional Sales Office.

3. When ordering parts always refer to the catalog number
and stock number on the valve nameplate.

SYMPTOM PROBABLE CAUSE REMEDY

Reset pilot valve. If
change is from tam­pering, seal cap with
wire and lead seal.

Disassemble control
and clean.

Disassemble and
replace diaphragm.
Tighten nut.

Main valve
won’t open

Water is com­ing out of vent
hole in cover

Inlet pressure is below set­ting of pilot valve.

Pilot valve is stuck closed:
Mineral deposit or foreign
material between disc retain­er and stem guide.

Pilot valve diaphragm is rup­tured or diaphragm nut is
loose.

OPERATION AND START-UP

1. Prior to pressurizing the valve assembly make sure the nec-

essary gauges to measure pressure in the system, are installed
as required by the system engineer.
CAUTION: During start-up and test a large volume of water
may be discharged downstream. Check that the downstream
venting is adequate to prevent damage to personnel and equip­ment. All pilot adjustments should be made slowly in small
increments. If the main valve closes too rapidly it may cause
surging in upstream piping.

2. Remove cap from CRL-60 then loosen adjusting screw coun­terclockwise. This will allow the valve to open at low pressure
relieving the full flow of the fire pump. Bleed all air from the valve
at this time by carefully loosening the cover plug and tube fittings
at the high points. Slowly turn the adjusting screw clockwise on
the CRL-60 while watching the gauge between the valve and the
pump until you reach the desired set-point. Tighten the jam nut on
the CRL-60 and replace the cap. DO NOT USE THE GAUGE
PROVIDED ON THE VALVE TO SET THE VALVE. IT IS ONLY
THERE TO INDICATE PRESSURE IN THE COVER.

Main valve is
stuck closed

Main valve
won’t close

Main valve
stuck open

Valve leaks
continuously

Mineral build-up on stem.
Stem damaged.

Inlet pressure is above set­ting of pilot valve.

Clogged orifice or strainer.

Pilot valve is stuck open:
Foreign material or mineral
deposit under disc retainer or
diaphragm assembly.

Foreign material or mineral
deposit between seat and
disc assembly.
Main valve diaphragm worn
out.

Pilot valve disc worn out.
Main valve disc worn or dam­aged.

Set point too close to inlet
pressure.

Disassemble main
valve, clean parts
and/or replace
damaged part.

Reset pilot valve

Disassemble and
clean.

Disassemble and
clean.

Disassemble and
clean.

Disassemble and
replace.

Disassemble and
replace.

Reset pilot valve.

50B-4KG1 SCHEMATIC

G

4

3

2. CRL-60 PILOT VALVE

2

SCREW, ADJUSTING

CAP

GUIDE, SPRING CRL

SPRING, CRL

COVER, CRL

NUT,
HEX JAM

BALL

5

INLET OUTLET

6

BASIC COMPONENTS

1 100-06 Hytrol (Main Valve)
2 CRL-60 Pressure Relief Pilot Valve
3 X44A Strainer & Orifice Strainer
4 81-01 Check Valve
5 Pressure Gauge
6 X46A Flow Clean Strainer

1. HYTROL MAIN VALVE

COVER

Cover Bolt

6" and Smaller

FLAT WASHER

*

DIAPHRAGM

SPRING

1

PIPE PLU

COVER BEARING

STEM NUT

DIAPHRAGM WASHER

HEX NUT

8" and Larger

FLAT WASHER

PIPE PLUG

GUIDE, SPRING CRL

O-RING

O-RING

STEM ASSEMBLY, CRL-60

BODY, CRL-60

3X 1/2-14 NPT OR

3X 3/4 -14 NPT

CRL-60 (100 - 300 psi) configuration shown

CRL-60 adjustment

range (psi)

0 - 75 Red 8.5

20 - 105 Silver 12.0

20 - 200 Green 28

100 - 300 Yellow 18

* Approximate. Use gauge at valve inlet to set

CRL-60 Pilot Valve

2.

Spring Color psi change per turn*

X44A Strainer &

3.

NUT, STEM, CRL

BELLEVILLE WASHER

SCREW, FIL HD 10-32

WASHER, DIAPHRAGM

DIAPHRAGM

DIAPHRAGM
WASHER (LOWER)

GUIDE STEM, CRL-60

O-RING

PIPE PLUG

Orifice Strainer

DISC RETAINER

*

SPACER WASHERS

*

DISC

DISC GUIDE

STEM

Seat Screw

8" and Larger

SEAT O-RING

PIPE PLUG

*

Repair Parts

STUD

8" and Larger

BODY

(Globe

or

Angle)

CLA-VAL

SEAT

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

©

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

81-01 Check Valve

4.

Pressure Gauge

X46A Flow Clean

5.

6.

For a more detailed Tech Manual, go to www.cla-val.com or

contact a Cla-Val Regional Sales Office.

N-50B4KG1/2050B4KG1_CRL-60 (R-06/2014)

Strainer