Richter PA/S Series Sampling Valves - Manual (Page 11)

Series PA/F, PA/S
Page 11
9510-060-en Revision 02
TM 7165 Edition 06/2008
8 Malfunctions
Flange connection ball valve/pipe is leaking
Retighten the flange screws to a tightening torque
according to Section 1.2. If this does not remedy
the leak, the recommended torques may be ex-
ceeded by 10%.
If this also fails to stop the leak, dismantle and
inspect the ball valve.
Flange connection body/seat or body/cover is
leaking
Retighten body screws. See paragraph "Flange
connection ball valve/pipe is leaking".
Packing leaks
Bellows leaking.
Retighten safety packing and switch off plant as
quickly as possible and isolate pipe section with
valve.
Valve does not close tight
Loosen lock nut under the star knob and close the
valve using the star knob.
9 Maintenance
All repair work is to be performed by qualified
personnel using the appropriate tools. Generally
recognised practice in mechanical engineering is to
be observed.
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 1.2.
Make sure that when working on the
sampling valve it is drained.
See also Section 7.4
9.1 Dismantling PA/F
Undo clip 937/1 and unscrew bottle connection
226.
Undo groove nut 509/1. Star knob 963/1 can
remain screwed in.
Unscrew spring bonnet 513.
Pull pressure spring 952/1 off the stem 855.
Undo setscrew 904/1 in spring bush 514.
Unscrew spring bush 514.
Unscrew hex. nut 920/4 with tooth lock washer
936/2, remove seat 205.
Unscrew hex. nut 920/2 with tooth lock washer
936/1, remove cover 106.
Pull out bellows 206 with stem 855 downwards.
Remove actuation 515 from cover.
If the packing rings have to be replaced:
Unscrew hex. nut 920/1.
Remove packing gland follower 503.
Pull thrust ring 405 out of cover.
Replace packing rings 402/1.
CAUTION: Offset overlapping from ring to ring by
60°- 90°.
Insert thrust ring 405 into cover.
Mount packing gland follower 503 onto stud screws
902/1 and pre-assemble with hex. nut 920/1.
9.2 Dismantling PA/S
Unscrew cap nut 927/1, remove disc 550 and bottle
connection 226.
Undo groove nut 509/1. Star knob 963/1 can
remain screwed in.
Unscrew spring bonnet 513.
Pull pressure spring 952/1 off the stem 855.
Undo setscrew 904/1 in spring bush 514.
Unscrew spring bush 514.
Unscrew hex. nut 920/2, remove cover 106,
remove threaded rod 918/1.
Pull out bellows 206 with stem 855 downwards.
Remove actuation 515 from the cover.
If the packing rings have to be replaced:
Unscrew hex. nut 920/1.
Remove packing gland follower 503.
Pull thrust ring 405 out of cover.
Replace packing rings 402/1.
CAUTION: Offset overlapping from ring to ring by
60°- 90°.
Insert thrust ring 405 into cover.
Mount packing gland follower 503 onto stud screws
902/1 and pre-assemble with hex. nut 920/1.