Richter HVR Series Bellows-Sealed Valves - Manual (Page 10)

Installation and Operating Manual
Series HV, HVR
9520-050-en Revision 01
TM 6128 MPE/Wm Page 10 Edition 04/2005
8 Maintenance
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.
Spare parts are to be ordered with all the details in
acc. with the valve identification.
Only original spare parts may be installed.
The seat is marked with:
The plug is marked with:
8.1 Dismantling
8.1.1 Dismantling plug
Move plug 204 into the open position.
Remove screw fittings 901/1, 936/1 (with DN 100
902/2, 936/1, 920/3).
Pull upper part vertically out of the body 100.
Undo bellows 206 with plug 204 by hand or use a
strap wrench. Right-hand thread.
With the heavy-duty bellows do not remove the
support rings 231 and the support disc 232.
Pull out round cord 522 of the plug 204 with pliers.
Unscrew plug 204 by hand or use a strap wrench.
Right-hand thread.
Check whether the seat is still OK.
If not: replace. See Section 8.2.2.
8.1.2 Replacing packing rings
Only replace packing rings and thrust ring when
necessary.
Dismantling and assembly are described in the
following, once the upper part has already been pulled
out of the body.
DN 15 and DN 20
Remove spring-type slotted pin 939/3.
Unscrew handwheel 210.
Unscrew packing nut 404.
Remove thrust ring 405/1.
Turn spindle 802 with guide 801 and, when thread
is free, pull downwards.
Replace packing rings 402/1.
Insert thrust ring 405/1 and packing nut 404.
Push spindle 802 with guide 801 upwards. Make
sure that the round head rivet 565/1 lies in the
groove of the cover 106. Then screw spindle/guide
into the cover.
Tighten packing nut 404 slightly.
Screw on handwheel 210.
Force in spring-type slotted pin 939/3.
DN 25 - DN 65 (1" - 2")
Force out spring-type slotted pins 939/2.
Unscrew handwheel hub 230 with handwheel 210.
The plain bearings 300/1, 300/2 and the ring
500/1 may fall out of the cover 106.
Undo stuffing box screw fittings 902/1, 920/1,
554/1.
Force out spring-type slotted pin 939/1.
Pull out stem 855 downwards.
Remove ring 500/1 and lower plain bearing 300/2.
Remove packing gland follower 503 and thrust ring
405/1.
Replace packing rings 402/1.
Insert thrust ring 405/1 and packing gland follower
503.
Before pushing up the stem, push plain bearing
300/2 and ring 500/1 over the stem.
Push up stem 855 and force in spring-type slotted
pin 939/1.
Tighten packing gland follower 503 slightly.
Screw handwheel hub 230 with handwheel 210
into the plain bearings.
Push up ring 500/1 and force in spring-type slotted
pins 939/2.