6
MS-CRD-0064
Revision 1 6-00-CP
Bleed
passage
VCR, VCO, Swagelok — TM Swagelok Co.
© 2000 Swagelok Company
Safe Product Selection
When selecting products, the total system design
must be considered to ensure safe, trouble-free
performance. Function, material compatibility,
adequate ratings, proper installation, operation, and
maintenance are the responsibilities of the system
designer and user.
Caution: Do not mix or interchange parts with those
of other manufacturers
Symptom
Possible Causes
Corrective Action
Valve trips during
normal operation
Flow surges higher than expected.
Evaluate a smaller valve.
Evaluate a lower trip range spring option.
Valve trips at
normal flow after
being in service for
some time.
Poppet openings are plugged.
Clean or replace poppet.
Flush or blow down regularly.
Clean on a regular preventive maintenance
schedule.
Valve does not trip
at high flow
Valve is too large.
Evaluate a smaller valve.
Evaluate a lower trip range spring option.
Low system pressure.
System pressure must be greater than
trip pressure.
Evaluate a lower trip range spring option.
Poppet is stuck.
The parts are contaminated. Clean
the parts thoroughly. Replace the damaged
parts.
Service regularly.
The parts are corroded. Replace corroded
parts. Select a compatible material.
Valve does not
reset itself
Bleed passage on
poppet is plugged.
The parts are contaminated. Clean
the parts thoroughly. Replace the
damaged parts.
Service regularly.
The parts are corroded. Replace corroded
parts. Select a compatible material.
Troubleshooting
