INTRODUCTION
The Cla-Val 40-01/640-01 is an automatic valve designed to limit
the maximum flow rate regardless of changing line pressure.
It is hydraulically operated, pilot-controlled, diaphragm type
globe or angle valve. The pilot control is actuated by the
differential pressure produced across an orifice plate restriction
installed downstream of the valve. Accurate control is insured as
very small changes in the controlling differential produce
immediate corrective action of the main valve. Rate of flow is
adjustable by varying the spring loading on the pilot control.
INSTALLATION
1. Allow sufficient room around the valve to make adjustments
and for disassembly.
2. It is recommended that either gate or block valves be installed
on both ends of the Cla-Val Valve to facilitate isolating the valve
for preventive maintenance.
NOTE: BEFORE THE VALVE IS INSTALLED, PIPE LINES
SHOULD BE FLUSHED OF ALL CHIPS, SCALE, AND FOREIGN
MATTER.
3. Place valve in line with flow through the valve in the direction
indicated on the inlet plate or by flow arrows. Check all fittings
and hardware for proper makeup and that no apparent damage
is evident. Be sure main valve cover nuts/bolts are tight.
Pressure in some applications can be very high, be thorough in
checking and inspecting for proper installation and makeup.
4. For best control, it is recommended that the orifice plate
restriction be installed 1 to 5 pipe diameters downstream of the
main valve. The flow arrows should be pointing to the down-
stream side of the system.
5. A sensing line, supplied by other than Cla-Val, must be
connected between the orifice plate holder (4) and the
Differential Control (3). See dotted lines on schematic drawing.
6. Cla-Val Valves operate with maximum efficiency when mount-
ed in horizontal piping with the cover UP: however, other posi-
tions are acceptable. Due to size and weight of cover and inter-
nal components of six inch and larger valves, installation with the
cover up is advisable. This makes periodic inspection of internal
parts readily accessible.
OPERATING AND START-UP
1. Prior to pressurizing the valve assembly make sure the
necessary 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 provide visual indication of the valve diaphragm assembly
position during startup.
CAUTION: During startup and test procedures a large volume of
water may be discharged downstream. Check that the down-
stream venting is adequate to prevent damage to personnel and
equipment. All adjustments in pressure should be made slowly.
If the main valve closes too fast it may cause surging in
upstream piping.
2. With the downstream block valve closed, slowly open
upstream block valve. If isolation valves (B) are installed in the
pilot system, open these valves.(see schematic)
3. Carefully loosen the plug at top of cover assembly. If an
indicator (X101) is installed, loosen the bleed valve at top of
indicator. Bleed air from cover and tighten plug or bleed valve.
4. Carefully loosen tubing fittings at highest points and bleed air
from system. Retighten fittings.
NOTE: Be sure the sensing line, (dotted line shown on schemat-
ic) which connects the orifice plate holder (4) to the CDHS-18
Control (3) is installed. The 40-01/640-01 Rate of Flow Control
Valve will not function unless this sensing line is installed. Be sure
to bleed air from this sensing line at the CDHS-18 Control fitting.
5. Slowly open downstream block valve and adjust the CDHS-18
Control for required flow rate. Turn the adjustment screw clock-
wise to increase flow rate and counterclockwise to decrease flow
rate. The adjustment screw should be turned slowly. A good pro-
cedure is to make one adjustment turn with a pause to let the
system stabilize.
MAINTENANCE AND INSPECTION
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
handled is affecting the operation 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.
40-01/640-01
Rate of Flow Control Valve
MODEL
INSTALLATION / OPERATION / MAINTENANCE
SYMPTOM POSSIBLE CAUSE
Orifice plate assembly and/or
orifice sensing line clogged
Remove line and
clean orifice port
Clean or replace line
Readjust control
Adjustment below desired
set point
Control line shutoff valve to
cover or main outlet closed
Open shutoff valve
Adjustment above desired set
point
Readjust control
Pilot control diaphragm nut
loose or diaphragm leaks
(damaged)
Disassemble tighten
nut or replace
diaphragm
Clogged restriction assembly Remove and clean
or replace
Control line shutoff valve from
inlet to restriction closed
Open shutoff valve
and readjust
CV Flow control closed or
clogged
Disassembled and
clean
Pilot control disc worn or
nicked
Remove disc retainer
assembly and replace
Pilot valve stuck closed
Mineral deposits or foreign
matter under disc retainer
assembly
Remove plug and disc
retainer assembly
clean or replace
Main valve stuck closed
Mineral buildup on stem
Stem damaged
Diaphragm leaks
Disassemble main
valve clean parts
and/or replace
damaged parts
SOLUTIONS
Main valve
won’t open
Main valve
won’t close
Distributed By: M&M Control Service, Inc.
http://www.mmcontrol.com/claval-index.php
800-876-0036 847-356-0566
