8 Trouble-shooting
For all maintenance and repair work please observe the general
safety instructions under Section 7.1.
Problem
Possible cause
Remedial action
Valve makes noises
Unfavourable installation position and
thus unfavourable flow at the valve (e.g.
installed to closely behind the elbow)
Change installation position (cf. Section 4.3)
Valve operating beyond the design limits
Check design and/or operational data; if requi-
red, change resistance in valve by using other
internals.
Valve can not be operated
Foreign particle jammed in the seat area Flush valve; if required, disassemble valve and
remove foreign object
Gear blocked
Dissolving the blockage
Electric actuator not yet connected to
power supply
Connect to power supply
Unfavourable flow at the valve and
obstruction of the movement
Change installation position (cf. Section 4.3)
Leaks in the body seat
Valve not completely closed yet
Close valve completely
Valve sealing damaged or worn
Replace sealing ring
