MEDENUS R 100 User Manual

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© 11.2023
9.2 Safety Shut-Off Valve
Description of the error Possible cause Elimination
No internal tightness in
closed position
Actuator dirty or damaged
Check valve seat and valve plate (seal) for damage and
dirt
Pressure compensation valve (internal
bypass) in the actuator dirty or sealing
elements damaged
Check O-rings in the pressure compensation valve or at
the SSV spindle and replace them, if necessary
SSV cannot be opened No pressure compensation at actuator
Pressure compensation by opening the bypass ball valve
(item 5.28)
SSV cannot be engaged
Difference between response pressure and
operating pressure or between upper and
lower response pressure is too small
Correct response pressure settings consider required
re-engagement differential (see RS 250 / 251 product
overview)
Only in case of underpressure switching:
Diaphragm in the control device defective
or incorrectly installed
Check diaphragm and replace it, if necessary
Pressure at the measuring point too high
or low (only with underpressure switching)
Lower or increase pressure at measuring point to
operating value (GPR setpoint value)
Sluggishness of the trigger mechanism
due to dirt / wear
Service switching device and replace if worn-out
mechanically
Permissible
response pressure
group is exceeded
Irregularities in response
behavior
Difference between response pressure and
operating pressure or between upper and
lower response pressure is too small
Correct response pressure settings consider required
re-engagement differential (see RS 250 / 251 product
overview) *
Diaphragm in the control device incorrectly
installed
Check diaphragm for irregular tension
Sluggishness of the trigger mechanism
due to dirt / wear
Service switching device and replace if worn-out
mechanically
Gas escapes through
breather line
Diaphragm clamping has become loose
Diaphragm is damaged or has been
mounted incorrectly
O-ring sealing (item 35) dirty or damaged
Check diaphragm for fastening, damage, and correct fit
Check O-ring and replace it, if necessary
SSV frequently shuts off
Stopcock upstream of SRV is closed Open stopcock
SSV set too low or SRV set too high Check SSV and SRV settings
*) The pressure differences between GPR, SSV and system SRV must consider the response and closing pressure groups as
well as the re-engagement differentials of the devices in order to avoid any unintended SSV switching.
Note

MEDENUS R 100 Specifications

General

Brand	MEDENUS
Model	R 100
Category	Controller
Language	English