CLA-VAL
100-01
Installation - Operation - Maintenance
NGE - GE - AE
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CLA-VAL
Europe
www.cla-val.ch
4
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HYT001SE
C 11/08
All trouble shooting is possible without removing the valve from the line or removing the cover. It is highly recommended to
permanently install a Model X101 Valve Position Indicator and three gauges in unused HYTROL inlet, outlet and cover
connections.
SYMPTOM PROBABLE
CAUSE
REMEDY
Closed isolation valves in control system, or in
main line.
Open Isolation valves.
Lack of cover chamber pressure.
Check upstream pressure, pilot system, strainer,
tubing, valves, or needle valves for obstruction.
Diaphragm damaged. (See Diaphragm Check)
Replace diaphragm.
Diaphragm assembly inoperative.
Corrosion or excessive scale build-up on valve
stem. (See Freedom of Movement Check)
Clean and polish stem. Inspect and replace any
damaged or badly eroded part.
Mechanical obstruction. Object lodged in valve.
(See Freedom of Movement Check)
Remove obstruction.
Worn disc. (See Tight Sealing Check)
Replace disc.
Fails to close
Badly scored seat. (See Tight Sealing Check)
Replace seat.
Closed upstream and/or downstream isolation
valves in main line.
Open isolation valves.
Insufficient line pressure.
Check upstream pressure. (Minimum 5 psi flowing
line pressure differential.)
Diaphragm assembly inoperative.
Corrosion or excessive build-up on valve stem.
(See Freedom of Movement Check)
Clean and polish stem. Inspect and replace any
damaged or badly eroded part.
Fails to open
Diaphragm damaged. (For valves in "reverse
flow" only)
Replace diaphragm.
After checking out probable causes and remedies, the following three checks can be used to diagnose the nature of
the problem before maintenance is started. They must be done in the order shown.
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MAINTENANCE
PREVENTATIVE MAINTENANCE
The CLA-VAL Model 100-01 HYTROL Valve requires no lubrication or packing and a minimum of maintenance. However, a
periodic inspection schedule should be established to determine how the operating conditions of the system are affecting the
valve. The effect of these actions must be determined by inspection.
DISASSEMBLY
Inspection or maintenance can be accomplished without removing the valve from the line. Repair kits with new diaphragm
and disc are recommended to be on hand before work begins.
: Maintenance personnel can be injured and equipment damaged if disassembly is attempted with pressure in the
valve.
SEE CAUTION!.
1. Close upstream and downstream isolation valves
and independent operating pressure when used
to shut off all
pressure to the valve.
2. Loosen tube fittings in the pilot system to remove pressure from valve body and cover chamber. After pressure has been
released from the valve, use care to remove the controls and tubing. Note and sketch position of tubing and controls for
re-assembly. The schematic in front of the Technical Manual can be used as a guide when reassembling pilot system.
3. Remove cover nuts and remove cover. If the valve has been in service for any length of time, chances are the cover will
have to be loosened by driving upward along the edge of the cover with a
dull
cold chisel.
Summary of Contents for 90-01
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