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Troubleshooting
6
Troubleshooting
Fault
Flow rate
exceeds
adjusted set
point
Flow set point
not reached
Control loop
hunts
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
Possible causes
Valve too large for
control task
Seat and plug leak
Operating diaphragm
defective
Control line blocked
Incorrect set point range
selected
Safety device, e.g. pressure
regulator, has been
triggered
Electric actuator extended
Insufficient pressure drop
across the plant
Strainer blocked
Valve installed against
direction of flow
Valve too large for
control task
Solution
Recalculate K
and contact SAMSON.
VS
Remove valve, clean seat and plug. If necessary,
replace plug (section 4.2).
Otherwise, return device for repair.
Replace diaphragm (section 4.3) or return device
for repair.
Remove and clean control line.
Check set point range and contact SAMSON.
Check plant, unlock safety device.
Check control signal from the electric control device.
Compare existing differential pressure in the plant
with the plant's drag.
Min. diff. pressure = special diff. pressure + ( /
Drain and clean filter of the strainer.
Re-install valve such that direction of flow
corresponds to arrow on the body.
Recalculate K
and contact SAMSON.
VS
.
2
V K
)
VS
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