Troubleshooting - Samson 45-6 Mounting And Operating Instructions

5

Troubleshooting

Fault Possible cause
Differential Valve too large for con-
pressure set trol task
point is
Seat and plug untight
exceeded
Operating diaphragm
defective
Control line blocked
Differential Valve too small for con-
pressure set trol task
point is not
Safety device, e.g. pres-
reached
sure limiter, has been
triggered
Insufficient pressure drop
across the plant
Strainer blocked
Wrong installation of
valve
Control loop Valve too large for
hunts control task
Solution
Recalculate the valve sizing flow coefficient,
K , and contact SAMSON.
VS
Remove valve, clean seat and plug. If neces-
sary, replace plug (section 4.1). Otherwise,
return the device to SAMSON for repair.
Replace diaphragm (section 4.2) or return
the device to SAMSON for repair.
Remove control line and clean it.
Check set point range and contact
SAMSON.
Check plant, unlock safety device.
Compare existing differential pressure across
the plant with the plant's drag.
Drain and clean filter of the strainer.
Reinstall the valve in such a way that the
medium flows through the valve in the direc-
tion indicated by the arrow.
Recalculate the valve sizing flow coefficient,
K , and contact SAMSON.
VS
Troubleshooting
9
EB 3226 EN