N-49-01 (R-11/01)
4. Carefully loosen the pipe plug at top of cover assembly. If a
Valve Position Indicator is installed, loosen the vent plug at top
of Indicator. Bleed air from cover and retighten plug.
5. Carefully loosen tube fittings at highest points and bleed air
from system. Retighten fittings.
NOTE:
Be sure the sensing line (dotted line shown on schematic),
which connects the orifice plate to the CDHS-18 and the CRA
Control, is installed. This sensing line is supplied by the contractor
or others. The 49-01 system will not function unless this sensing
line is installed. The line should be routed without any high
spots above the control connections. Be sure to bleed air from
line at the control fittings.
6. Turn the CRA Control adjusting screw clockwise until spring
is fully compressed. DO NOT FORCE. This puts the control in
a full open mode.
7. Slowly open downstream block valve and adjust the CDHS-18
Control, turning the adjusting screw slowly counterclockwise
until the main valve closes. Adjust for rate of flow by turning
adjusting screw slowly clockwise.
8. Reduce flow rate to a value below the setting of CDHS-18
Control by closing downstream block valve or other means,
then turn the adjustment screw on the CRA Control counter-
clockwise until the main valve begins to close. Adjust for outlet
pressure requirements.
9. Check operation of controls by changing flow and pressure in
the piping system.
10. If opening and closing speed controls (Cla-Val CV) are
installed on the valve assembly, fine tune the opening and closing
speed of the main valve while performing step 9.
11. The rate of flow and pressure reducing feature is outlined in
Cla-Val engineering drawing 76573 included in this manual.
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 handled
is affecting the efficiency of the valve assembly.
2. Repair and adjustment procedures of the main valve and
control components are included in separate sections of the
manual. Accessory components are listed for reference.
3. Refer to the Service Suggestions Chart to identify operation
symptoms.
SERVICE SUGGESTIONS
SYMPTOM
Main valve
won't open.
Main valve
won't close.
PROBABLE CAUSE
Controls not adjusted properly.
Orifice port and/or orifice
sensing line clogged.
Control line shutoff cock to
cover, main valve outlet,
and/or orifice sensing line
closed.
Either of the pilot valves stuck
closed. Mineral deposits or
foreign matter under disc
retainer assembly.
Main valve stuck closed.
Mineral buildup on stem. Stem
damaged.
Controls not adjusted properly.
CRA and/or CDHS-18 Control
has foreign matter or mineral
buildup on yoke assembly.
CDHS-18 Control has foreign
matter or mineral buildup
above diaphragm.
Diaphragm of either control
leaks or stuck. Diaphragm
nut loose.
Clogged restriction assembly.
Clogged Flow Clean Strainer.
Control line shutoff cock from
inlet to restrictor closed.
CV Flow Control closed or
clogged.
Pilot control (CRA or
CDHS-18) disc worn or
nicked. Fails to seat.
REMEDY
Readjust controls.
Remove line and clean
orifice port. Clean or
replace line.
Open shutoff cock.
Remove plug and disc
retainer assembly. Clean
or replace.
Disassemble valve, clean
parts and/or replace dam-
aged parts.
Readjust controls.
Disassemble and clean
parts.
Disassemble and clean
parts.
Disassemble and clean
parts.
Remove and clean.
Remove and clean or
replace.
Open shutoff cock.
Readjust or disassemble
and clean.
Remove disc retainer
assembly and replace.
Distributed By: M&M Control Service, INC.
Phone: 800-876-0036 Fax: 847-356-0747 Email: [email protected]
Distributed By: M&M Control Service, Inc.
http://www.mmcontrol.com/claval-index.php
800-876-0036 847-356-0566
