See the figure in "Repairs" for item numbers.
Fault description
Cause
Remedy
Pressure falls below set level Piston seal (16) dirty
Clean the piston seal (16), see
"Repairs"
Piston seal (16) defective
Replace the piston seal (16), see
"Repairs"
Piston seat in the housing is
dirty
Clean the piston seat, see
"Repairs"
Piston seat in the housing is
defective
Contact ProMinent
Diaphragm (5) dirty
Clean the diaphragm (5), see
"Repairs"
Diaphragm (5) defective
Replace the diaphragm (5), see
"Repairs"
Set pressure cannot be rea‐
ched.
Valve installed wrong way
Turn the valve around, see the
direction arrow.
Pressure increases above
the allowable value
The piston guide (10.2) binds,
e.g. due to dirt
Dismantle the valve and clean -
refer to "Repairs"
The valve is set to too high an
opening pressure
Set the valve to a low opening
pressure
The piston guide (10.2)
clamps due to too high a
media temperature
Lower the media temperature in
accordance with the P-T diagram
Leaking at the level of the
diaphragm (5)
Contact pressure of the diaph‐
ragm tensioner is too low.
Tighten bolts (12). Tightening
torque – see "Repairs"
Leaking from the adjustment
screw (13)
Diaphragm (5) defective
Replace the diaphragm (5), see
"Repairs"
Loud noises when overflo‐
wing
Valve too small
Use a larger valve
Troubleshooting
55