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Malfunctions
Malfunction
Differential pressure
set point not reached
Loud noises
Note
Contact SAMSON's After-sales Service for malfunctions not listed in the table.
8-2
Possible reasons
Regulator installed against the flow
Plant differential pressure Δp too low
Regulator or K
/C
coefficient too
VS
V
small
Safety device, e.g. pressure limiter, has
been triggered
Incorrect set point range selected
Foreign particles blocking the plug
Insufficient pressure pulses on the
operating diaphragm
Strainer blocked
Defective operating diaphragm
High flow velocity, cavitation
Recommended action
Î Install the regulator so that the direction of flow
matches the direction indicated by the arrow on
the body.
Î Compare differential pressure in the plant with
the plant's drag.
Plant differential pressure
∆p
= ∆p
min
restriction
Î Check the sizing.
Î Change K
/C
coefficient, if necessary or
VS
V
install a different sized regulator.
Î Contact SAMSON's After-sales Service.
Î Check plant. If necessary, unlock safety device.
Î Check set point range
Î Contact SAMSON's After-sales Service.
Î Remove foreign particles.
Î Replace damaged parts.
Î Contact SAMSON's After-sales Service.
Î Clean the control line, needle valve and screw
fittings.
Î Clean the strainer.
Î Replace damaged diaphragm.
Î Check the sizing.
Î Install larger regulator, if necessary.
.
+ (V/K
)²
VS
EB 3124 EN
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