Manual

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
f
ollowing, 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.