CLA-VAL 50B-5KG Installation Operation & Maintenance

MODEL
The Model 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.
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.
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 dis-similar metals.
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 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.
DO NOT USE THE GAUGE PROVIDED ON THE VALVE TO
SET THE VALVE. IT IS ONLY THERE TO INDICATE
PRESSURE IN THE COVER.
50B-5KG/2050B-5KG
INSTALLATION / OPERATION / MAINTENANCE
Pump Suction Control 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 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
Main valve
won't open
Water is com-
ing out of vent
hole in cover
Main valve is
stuck closed
Main valve
won't close
Main valve
stuck open
Valve leaks
continuously
PROBABLE CAUSE
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.
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.
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.
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.