Richter KNARP-S/F Series Control Ball Valves - Manual (Page 12)

Series Series KNAR/F, KNARP/F, KNAR-D/F, KNARP-D/F,
Page 12
KNAR-S/F, KNARP-S/F ASME
9520-082-en Revision 04
TM 7377 Edition 11/2008
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.
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 Dismantling
9.1.1 Ball valve with lever
Remove lever 203.
Take out grounding spring washer 557.
Dismantle packing gland follower 503 and spring
gland follower 502.
The thrust ring 405/1, packing bellows 403 and
retaining washer 526 (not in 6" and 8") are one
unit and it is levered out using 2 screwdrivers.
Undo screw connection body end piece 102 /
main body 100.
Remove body end piece 102.
Remove V-control ball/stem unit 201. Pay
attention so as not to damage the body lining.
Remove seat rings 401.
9.1.2 Packing bellows
Remove retaining washer 526.
Separate thrust ring 405/1 and packing bellows
403 by pushing them apart.
9.1.3 Ball valve with actuator
Undo setscrew 904/4 in the coupling 804 by one
turn.
Undo sleeve nut 512 on the coupling by about 2
turns. Left-hand thread. Observe drawing in
Sections 10.3 and 10.5.
Remove actuator 850 and coupling 804.
Dismantle packing gland follower 503 and spring
gland follower 502.
Remove bracket 510.
Further dismantling is performed as described in
Section 9.1.1.
9.2 Assembly
Prior to assembly all parts are to be cleaned and
the plastic-lined components checked for damage.
Insert seat rings 401 in the main body 101 and
body end piece 102.
Mount and adjust V-control ball/stem unit 201. Pay
attention so as not to damage the body lining.
Notice the direction of flow. See sectional drawing
in Section 10.
An additional bore in the ball/stem unit, e.g. to
ensure it is cavity-free, must lie on the p1 side in
the closed position.
Mount body end piece 102. Tighten the body
screws to a tightening torque according to Section
1.3 in diametrically opposite sequence.
9.2.1 Packing bellows
Press thrust ring 405/1 into packing bellows 403.
Install retaining washer 526 (not in 6" and 8").
Press unit into body end piece 102.
Press in grounding spring washer 557.
9.2.2 Ball valve with lever
Mount lever stop 577, spring gland follower 502 (in
3", 4", 6" and 8" are 2 spring gland followers 502)
and packing gland follower 503. Tighten packing
nuts until there is no gap between packing gland
follower and spring gland follower. See Section
1.2 and 10.
Notice direction of rotation of V-control ball/stem.
Seal any tapped bores still open with plugs.
Mount lever 203.
9.2.3 Ball valve with actuator
Mount spring gland follower 502 (in 3", 4", 6" and
8" are 2 spring gland followers 502) and packing
gland follower 503. Tighten packing nuts until there
is no gap between packing gland follower and
spring gland follower.
See Section 1.2 and 10.
Mount bracket 510 with the opening at right angles
to the direction of flow.
Mount coupling 804 and actuator 850. Notice
direction of rotation of V-control ball/stem unit 201.
Observe the actuator position in accordance with
the actuator operating manual.