Cla-Val 50-01/650-01 Quick Manual - Manual

Pressure Relief, Pressure Sustaining &
Back Pressure Valve
INTRODUCTION
The Cla-Val 50-01/650-01 is an automatic control valve designed to
maintain constant upstream pressure to close limits. It is a
hydraulically operated, pilot controlled, modulating type valve. It is
used where pressure relief or pressure sustaining functions in a
bypass system are required.
The valve is actuated by inlet line pressure, opening to maintain a
steady line pressure and closing gradually to prevent surges.
When inlet pressure is below the pressure setting CRL pilot control,
the main valve and pilot are closed drip tight. Pressure setting
adjustment is made with single adjusting screw that has a protective
cap to discourage tampering.
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 dis-
charge 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.
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. A Cla-Val X101 Valve
Position Indicator may be installed in the center cover port to pro-
vide a visual indication of the valve stem position during startup
adjustment.
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. If isolation valves (B) are installed in pilot system open these
valves (see schematic).
3. Loosen jam nut on X42N-2 strainer valve assembly and turn
adjusting stem clockwise until it seats. Then turn stem counter-
clockwise 1/4 to 1/2 turn and tighten jam nut for an initial setting.
4. Remove cap on the CRL Pressure Relief Control, loosen jam
nut and turn adjusting screw clockwise until spring is fully com-
pressed. This puts the control in full closed mode and will cause
the main valve to close when system is pressurized.
5. If a downstream block valve is installed, slowly open this valve.
6. Partially open upstream block valve. The main valve should
close.
7. Carefully loosen the plug at top of indicator assembly. If an
indicator (X101) is installed, loosen the bleed valve at top of indi-
cator. Bleed air from cover and tighten plug or bleed valve.
Carefully loosen tubing fittings at highest points and bleed air from
system. Retighten fittings.
8. Open fully the upstream block valve and turn the CRL adjusting
screw slowly counterclockwise until you begin to hear a flow
through the control. The main valve should start to open. If the
pressure is below the required relief setting, refer to the spring
chart and turn the adjusting screw clockwise the number of turns
required for the proper setting. Lock the jam nut and replace
cover. An observation of the pressure relief setting should be made
during usage. The controls can be readjusted as required.
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 IOM
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.
INSTALLATION / OPERATION / MAINTENANCE
50-01/650-01
MODEL
SYMPTOM PROBABLE CAUSE REMEDY
Main valve Inlet pressure below setting of Reset pilot valve. If change
won't open pilot valve in setting is from tampering,
seal cap with wire and
lead seal
Pilot valve stuck closed Mineral Disassemble control and clean
deposit or foreign material between
disc retainer and power unit body
Pilot valve diaphragm ruptured or Disassemble and replace
diaphragm nut loose. Water coming diaphragm Tighten nut
out of the vent hole in cover
Main valve stuck closed Disassemble main valve,
clean
Mineral buildup on stem parts and/or replace damaged
Stem damaged part. Check downstream
and cover CK2 isolation
valves are open
Main valve Inlet pressure above setting of Reset pilot valve
won't close pilot valve
Clogged needle valve or strainer Disassemble and clean
Pilot valve stuck open. Mineral Disassemble and clean
deposit or foreign material under
disc retainer or under diaphragm
assembly
Main valve stuck open. Mineral Disassemble and clean
buildup on stem. Foreign material
between seat and disc assembly
Main valve diaphragm worn Disassemble and replace
Valve leaks Pilot valve disc worn out Disassemble and replace
Continuously Main valve disc worn or small Disassemble and replace
pin hole in main valve diaphragm
Set point too close to inlet pressure
Reset CRL Pilot