Failure
Remedy
V a l v e c l o s e d a n d p r e s s u r e i n u p p e r h o u s i n g
Valve leaks
Replace seat seal (2)
Check line pressure (max. 10bar)
Leakage from the leakage bore
Check tightening torque of safety nut.
in the yoke area
Replace shaft with bellow unit
(3)
.
Leakages between housing and yoke flange
Replace o-rings
(4)
.
A c t u a t o r
Air escapes at the actuator rod
Replace o-ring
(2)
at the upper side
of the actuator.
Actuator does not work
(air escapes permanently from the venting plug)
Replace the complete actuator.
Valve position indication
No feedback
Carry out fine adjustment.
15
12.
Trouble Shooting
13.
Spare parts Lists
(see annex)
The reference numbers of the spare parts for the different valve
designs and sizes are included in the attached spare parts
drawings with corresponding lists.
Please indicate the following data to place an order for spare parts:
-
number of parts required
-
reference number
-
designation.
UK
DELTA MF4-UK0.qxd / 12.2004
Membrane Valve with Bellow Unit
DELTA MF4
Operating Manual rev. 0
