Samson 33-7, Mounting And Operating Instructions

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EB 2551-2 EN 8-1
Malfunctions
8 Malfunctions
8.1 Troubleshooting
Malfunction Possible reasons Recommended action
Upstream 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.
Insufficient differential pressure across the
regulator
Î
Observe differential pressure Δp specified in
Table 3-1 in the 'Design and principle of
operation' section.
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.
Control line blocked
Î
Clean the control line and screw fittings.
Upstream pressure
drops below the
adjusted set point.
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.
Seat and plug in the main valve or pilot
valve are worn or leak.
Î
Contact SAMSON's After-sales Service.
Insufficient pressure pulses on the operat -
ing diaphragm
Î
Clean the control line and screw fittings.
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.
Upstream pressure
fluctuates
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
response
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.