Samson 33-1, Mounting And Operating Instructions

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EB 2551-1 EN 8-1
Malfunctions
8 Malfunctions
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Downstream pressure
exceeds the adjusted
set point.
Foreign particles blocking the plug in
the main valve or pilot valve
Î
Contact SAMSON's After-sales Service.
Seat and plug in the main valve or
pilot valve are worn or leak.
Î
Contact SAMSON's After-sales Service.
Control line blocked
Î
Clean the control line and screw fittings.
Downstream pressure
drops below the ad-
justed set point.
Insufficient differential pressure across
the regulator
Î
Observe differential pressure Δp specified in
Table 3-1 in the 'Design and principle of
operation' section.
Regulator installed against the flow
Î
Install the regulator so that the direction of flow
matches the direction indicated by the arrow on
the body.
Insufficient pressure pulses on the
operating diaphragm
Î
Clean the control line and screw fittings.
Defective operating diaphragm
Î
Contact SAMSON's After-sales Service.
Regulator or K
VS
/C
V
coefficient too
small
Î
Check the sizing.
Î
Contact SAMSON's After-sales Service.
Foreign particles blocking the plug in
the main valve or pilot valve
Î
Contact SAMSON's After-sales Service.
Control line blocked
Î
Clean the control line and screw fittings.
Strainer blocked
Î
Clean the strainer upstream of the regulator.
Î
Clean the strainer in the pilot valve.
Downstream pressure
hunts
Regulator or K
VS
/C
V
coefficient too
large
Î
Check the sizing.
Î
Contact SAMSON's After-sales Service.
Slow control response Dirt in the control line
Î
Clean the control line.
Jerky control re -
sponse
Increased friction, e.g. due to foreign
particles between seat and plug in the
main valve or pilot valve
Î
Remove foreign particles.
Î
Contact SAMSON's After-sales Service.
Loud noises High flow velocity, cavitation
Î
Check the sizing.
Î
Install larger regulator, if necessary.
Leakage at the actuator
Damage at the operating diaphragm/
balancing bellows
Î
Contact SAMSON's After-sales Service.