CLA-VAL
CV
Flow Control Cock
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CLA-VAL
Europe
www.cla-val.ch
1
-
CV0001SE
A 11/08
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Installation - Operation - Maintenance
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DESCRIPTION
The CLA-VAL Model CV Flow Control is a simply-
designed, spring-loaded check valve. Rate of flow is full
flow in one direction and restricted in other direction.
Flow is adjustable in the restricted direction. It is
intended for use in conjunction with a pilot control
system on a CLA-VAL Automatic Control Valve.
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OPERATION
The CV Flow Control permits full flow from port A to B,
and restricted flow in the reverse direction. Flow from
port A to B lifts the disc from seat, permitting full flow.
Flow in the reverse direction seats the disc, causing fluid
to pass through the clearance between the stem and the
disc. This clearance can be increased, thereby
increasing the restricted flow, by screwing the stem out,
or counter-clockwise. Turning the stem in, or clockwise
reduces the clearance between the stem and the disc,
thereby reducing the restricted flow.
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INSTALLATION
Install the CV Flow Control as shown in the valve
schematic. All connections must be tight to prevent
leakage.
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MAINTENANCE
DISASSEMBLY
Follow the sequence of the item numbers assigned to
the parts in the cross sectional illustration for
recommended order of disassembly (see page
CV001TT).
INSPECTION
Inspect all threads for damage or evidence of cross-
threading. Check mating surface of seat and valve disc
for excessive scoring or embedded foreign particles.
Check spring for visible distortion, cracks and breaks.
Inspect all parts for damage, corrosion and cleanliness.
CLEANING
After disassembly and inspection, cleaning of the parts
can begin. Water service usually will produce mineral or
lime deposits on metal parts in contact with water. If the
deposit is not removed after cleaning, then a fine grit
(400) wet or dry sandpaper can be used with water.
Rinse parts in water before handling.
Dry with compressed air or a clean, lint-free cloth.
Protect from damage and dust until reassembled.
REPAIR AND REPLACEMENT
Minor nicks and scratches may be polished out using a fine
grade of emery or crocus cloth; replace parts if scratches
cannot be removed. Replace o-ring packing and gasket
each time CV Flow Control is overhauled (see replace
packing in the spare parts liste). Replace all parts which are
defective. Replace any parts which create the slightest
doubt that they will not afford completely satisfactory
operation. Use Inspection steps as a guide.
REASSEMBLY
Reassembly is the reverse of disassembly; no special tools
are required.
TEST PROCEDURE
No testing of the flow Control is required prior to
reassembly to the pilot control system on CLA-VAL Main
Valve.
Summary of Contents for 90-01
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