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point spring is tensioned sufficiently to
keep the lower diaphragm plate in place
in the body and to prevent it from
moving freely.
11. If applicable, insert the set point
spring (8) into the valve body.
12. Align the bottom section of the valve
body to fit the control line connections.
Thread the screws (14) evenly into the
valve body (8 Nm).
5
Troubleshooting
Fault
Possible causes
Differential
Valve too large for
pressure
control task
exceeds
Seat and plug untight
adjusted set
point
Operating diaphragm
defective
Control line blocked
Differential
Valve too small for
pressure set
control task
point not
Safety device, e.g. pres-
reached
sure limiter, has
been triggered
Insufficient pressure
drop across the plant
Strainer blocked
Valve installed against
direction of flow
Control loop
Valve too large for
hunts
control task
13.
For Type 45-2, screw on the control
line.
14.
Install the regulator in the pipeline.
Mount the external control line. Ad-
just the differential pressure set point
as described in section 3.2.
Recommended action
Recalculate K
and contact SAMSON.
VS
Remove valve, clean seat and plug. If neces-
sary, replace plug (section 4.1).
Otherwise, return device for repair.
Replace diaphragm (section 4.2) or return de-
vice for repair.
Remove and clean control line.
Check set point range and contact SAMSON.
Check plant, unlock safety device.
Compare existing differential pressure in the
plant with the plant's drag.
Drain and clean filter of the strainer.
Re-install valve such that direction of flow cor-
responds to arrow on the body.
Recalculate K
and contact SAMSON.
VS
Troubleshooting
9
EB 3124 EN
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