Richter MVMP/F Series Diaphragm Valves with Actuator - Manual (Page 11)

Series MV/F, MVM/F, MVP/F, MVMP/F
Page 11
9510-050-en Revision 02
TM 7669 Edition 10/2009
9 Maintenance
All repair work is to be performed by qualified
personnel using the appropriate tools.
For the arrangement, designation and item
numbers of all parts of the valve, see Section
10.
Spare parts are to be ordered with all the details
in acc. with the valve identification.
Only original spare parts may be installed.
To prevent leaks, a regular check of the
connection screws should be made in line with
the operating requirements.
For torques see Section 1.3.
9.1 Replacing the diaphragm
9.1.1 Dismantling diaphragm valve with
handwheel
The plant must be depressurised and
drained! The valve can remain installed
during the maintenance work.
Undo hex. nuts 920/1 of the bonnet 112 and
remove. The handwheel can remain installed for
replacing the diaphragm.
Remove bonnet 112.
Unscrew stem 855 off the bonnet.
Unscrew the compressor 211 out of the
diaphragm / diaphragm support 212 out of the
tube nut 569.
Remove diaphragm / diaphragm support 212.
9.1.2 Dismantling diaphragm valve with
actuator
Compact actuator: Observe separate instructions.
Dismantling column-style/bracket-style actuator:
Remove actuator 850 and coupling 804.
Remove bracket 510 or yoke 516 with protective
bellows 687/1 and travel stop.
The entire actuator with bonnet can also be
removed to replace the diaphragm.
For further dismantling, proceed as described in
Section 9.1.1.
9.1.3 Assembly
Prior to assembly all parts are to be cleaned and
the plastic-lined components be checked for
damage.
The entire valve is always assembled in the
open position.
9.1.4 Assembly diaphragm valve with
handwheel
Screw diaphragm/diaphragm support 212
into the tube nut 569 in the compressor 211
up to the stop and turn into the correct posi-
tion.
Turn the stem 855 into the bonnet 112.
Connect compressor 211 with stem 855.
Push compressor guide onto the stem from
the side.
Screw stem 855 in the open position right up
to the travel stop.
Mount bonnet 112 onto the body and bolt
together. For tightening torques, see Section
1.3.
Leak test with handwheel. Turn nut until up
against the bonnet.
9.1.5 Assembly diaphragm valve with
actuator
Compact actuator: Observe separate instructions.
Dismantling column-style/bracket-style actuator:
For assembly of bracket 510 or yoke 516,
see drawing in Section 10.
Option
Mount travel stop 508 with protective bellows
687/1.
Mount coupling 804 and actuator 850. Ob-
serve securing position, see operating in-
structions for the actuator.
For further assembly, proceed as described
in Section 9.1.4.
9.1.6 Diaphragm valve with safety
stuffing box
A modified bonnet is used when installing a safety
stuffing box.
Insert 2 packing rings 402/1 offset against
each other.
Insert thrust ring 405/1.
Screw on packing nut 404. Only tighten
further in the event of a leak.
In order to ensure leak monitoring, Richter
recommends the combination of the safety stuffing
box with a warning connection.
If only the safety stuffing box is present, do not
tighten it so that any leak becomes visible.
Otherwise the valve may be destroyed by an
unnoticed internal leak.