Richter RSS/F Series Bellows-Sealed Control Valves - Manual (Page 14)

Series RSS/F
Page 14
9260-060-en Revision 03
TM 7168 Edition 06/2008
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.
The maintenance staff can decide whether the
valve is dismantled from the pipe or not for main-
tenance work. In both cases Section 7.3 is to be
observed.
It is also up to the maintenance staff to decide
whether the actuator or other accessories are
dismantled for the maintenance work.
Section 9.4 is to be observed for re-assembly of
the actuator.
To prevent leaks, a regular check of the connecti-
on screws should be made in line with the opera-
ting requirements.
For torques see Section 1.3.
9.1 Setting the travel stop
Fig. 1
To ensure the valve closes tight, a distance between
the travel stop 508 and cover 106 must be observed:
DN 15 – 50 (½“.– 2“)
: 0,5 mm
DN 65 – 100 (2½“ – 4“) : 1,0 mm
If these distances are not correct, the travel stop
must be reset:
Close valve.
Remove protection bellows 687.
Move travel stop 508 to the correct distance.
Tighten lock nut 920/2.
9.2 Maintenance of the upper
section
This mainly involves the following work:
Replacing the plug 204.
Replacing the bellows 206.
Inspecting the metal parts of the upper section and
replacing them if necessary.
The entire dismantling and assembly procedure is
described below. If only partial assembly is required,
this can be derived from the text.
9.2.1 Dismantling
Move plug 204 into open position if the actuator
850 is mounted.
Remove cover nuts and screws 901/1, 1x936/1,
1x936/2 and 920/2 (DN 100 902/2, 1x936/1,
1x936/2, 920/2 and 920/3).
Pull cover 106 vertically out of the body 100.
Remove protective bellows 687, travel stop 508
and packing nut 404.
Remove valve stem 800 with bellows 206 and plug
204 below.
Clamp valve stem 800 in a vice with protective
jaws.
Pull round cord 522 out of the plug 204 with a pair
of pliers.
Unscrew plug 204 by hand or with a strap wrench.
Right-hand thread.
Unscrew bellows 206 by hand or with a strap
wrench. Right-hand thread.
With the heavy-duty bellows 206 the support rings
231 and support disc 232 cannot be removed.
Only remove packing rings 402/1 and thrust ring
405 if necessary.
Only remove guide rings 302 if necessary. Use a
sharp tool, e.g. scribing iron or screwdriver.
With DN 80 and DN 100 (3“ and 4“):
only remove guide 801 if necessary. Press in the
direction of the stuffing box using a press.
Check to see whether the seat 205 is still ok.
If not: replace. See Section 9.3.