6
Troubleshooting
7
Customer inquiries
Should you have any inquiries, please submit
the following details:
4
Type and nominal size of the valve
4
Threaded or flanged connection
4
Model number
4
Upstream and downstream pressures
4
Flow rate in m³/h
4
Has a strainer been installed?
4
Installation drawing
10
EB 3135-1 EN
Troubleshooting
Fault
Possible causes
Solution
Flow rate
exceeds
adjusted set
point
Valve too large for
control task
Recalculate K
VS
and contact SAMSON.
Seat and plug leak
Remove valve, clean seat and plug. If necessary,
replace plug (section 4.2).
Otherwise, return device for repair.
Operating diaphragm
defective
Replace diaphragm (section 4.3) or return device
for repair.
Control line blocked
Remove and clean control line.
Flow set point
not reached
Incorrect set point range
selected
Check set point range and contact SAMSON.
Safety device, e.g. pressure
regulator, has been
triggered
Check plant, unlock safety device.
Electric actuator extended
Check control signal from the electric control device.
Insufficient pressure drop
across the plant
Compare existing differential pressure in the plant
with the plant’s drag.
Min. diff. pressure = special diff. pr ( /
)
.
V K
VS
2
Strainer blocked
Drain and clean filter of the strainer.
Valve installed against
direction of flow
Re-install valve such that direction of flow
corresponds to arrow on the body.
Control loop
hunts
Valve too large for
control task
Recalculate K
VS
and contact SAMSON.
