CLA-VAL 50B-5KG Owner's manual

The odel 50B-5KG/ 2050B-5KG Pump Suction Control Valve is
designed specifically for Fire Pump Suction Control Service. It
modulates to maintain the pump discharge in relation to the
suction head available, thus assuring that the suction head
pressure does not fall below the pre-set minimum.
INSTALLATI N
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.
N TE: BEF RE THE VALVE IS INSTALLED, PIPE LINES
SH ULD BE FLUSHED F ALL F REIGN 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 dis-similar metals.
PERATI N 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.
CAUTI N: 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 equip- ment. 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-5A then loosen adjusting screw coun-
terclockwise. 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-5A while watching the gauge between the valve and the
pump until you reach the desired set-point. Tighten the jam nut on
the CRL-5A and replace the cap.
D N T USE THE GAUGE PR VIDED N THE VALVE T
SET THE VALVE. IT IS NLY THERE T INDICATE
PRESSURE IN THE C VER.
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. inimum of once
per year.
2. Repair and maintenance procedures of the Hytrol ain Valve
and control components are included in a more detailed Tech
anual. It can be downloaded from 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.
Pump Suction Control Valve
50B-5KG/2050B-5KG
ODEL
INSTALLATI N / PERATI N / MAINTENANCE
SYMPT M PR BABLE CAUSE REMEDY
ain valve
won’t open
Inlet pressure is below setting
of pilot valve.
Reset pilot valve. If
change is from
tampering, seal cap
with wire and lead seal.
Pilot valve is stuck closed:
ineral deposit or foreign
material between disc retainer
and stem guide.
Disassemble control
and clean.
Water is com-
ing out of vent
hole in cover
Pilot valve diaphragm is
ruptured or diaphragm nut is
loose.
Disassemble and
replace diaphragm.
Tighten nut.
ain valve is
stuck closed
ineral build-up on stem.
Stem damaged.
Disassemble main
valve, clean parts
and/or replace
damaged part.
ain valve
won’t close
Inlet pressure is above setting
of pilot valve. Reset pilot valve
Clogged orifice or strainer. Disassemble and
clean.
Pilot valve is stuck open:
Foreign material or mineral
deposit under disc retainer or
diaphragm assembly.
Disassemble and
clean.
ain valve
stuck open
Foreign material or mineral
deposit between seat and disc
assembly.
Disassemble and
clean.
ain valve diaphragm worn
out.
Disassemble and
replace.
Valve leaks
continuously
Pilot valve disc worn out.
ain valve disc worn or
damaged.
Disassemble and
replace.
Set point too close to inlet
pressure. Reset pilot valve.

COVER
PIPE PLUG
COVER BEARING
SPRING
STEM NUT
DIAPHRAGM WASHER
DISC RETAINER
BODY
*SPACER WASHERS
DISC GUIDE
SEAT
PIPE PLUG
STEM
SEAT O-RING
STUD
8" and Larger
*DIAPHRAGM
*DISC
*Repair Parts
Seat Screw
8" and Larger
(Globe or Angle)
PIPE PLUG
HEX NUT
8" and Larger
Cover Bolt
6" and Smaller
FLAT WASHER
FLAT WASHER
For a more detailed Tech Manual, go to www.cla-val.com or
contact a Cla-Val Regional Sales ffice.
CLA-VAL
Copyright Cla-Val 2019 Printed in USA Specifications subject to change without notice.
1701 Placentia Ave •Costa Mesa CA 92627 Phone: [phone] •Fax: [phone] •E-mail: [email protected] •www.cla-val.com
©
N-50B-4KG/2050B-5KG_CRL-60 (R-07/2019)
50B-5KG SCHEMATIC 2. CRL5A PRESSURE RELIEF C NTR L
BASIC C MP NENTS
1 100-06 Hytrol ain Valve
2 CRL5A Pressure Relief Control
3 X44A Strainer & Orifice Assembly
4 CV Flow Control (Opening)
5 X101C Valve Position Indicator
6 CK2 Blow Off Valve
X44A Strainer &
rifice Strainer
X101C
Valve Position Indicator
Hytrol Main Valve
3.
5.
CV Flow Control
4.
* Approximate. Use gauge at valve inlet to set
CRL5A
2.
CRL5A adjustment range (psi)
* Approximate Increase for Each
Clockwise Turn of Adjusting Screw
(Item #9)
0 - 75 8.5 PSI
5 - 55 4.0 PSI
20 - 105 13.0 PSI
20 - 200 28.0 PSI
100 - 300 19.0 PSI
1.
CK2 Blow ff Valve
6.