Richter KNAP-S/F Series Ball Valves (ASME) - Manual (Page 12)

Series KNA/F, KNAP/F, KNA-D/F, KNAP-D/F,
Page 12
KNA-S, KNAP-S, ASME
9520-080-en_USA Revision 10
TM 8361 Edition 10/2011
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 connec-
tion screws should be made in line with the oper-
ating requirements.
For torques see Section 1.2.
9.1 Dismantling ball valve with
ball/stem unit
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 ball/stem unit 201 in closed position. 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
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 with ball/stem unit
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 ball/stem unit 201 in closed position. Pay
attention so as not to damage the body lining.
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
1.2 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 main body 101.
Press in grounding spring washer 557.
9.2.2 Ball valve with lever
Mount lever stop 577, spring gland follower 502 (at
3", 4", 6" and 8" are 2 spring gland followers) and
packing gland follower 503. Tighten packing nuts
until there is no gap between packing gland fol-
lower and spring gland follower. See Section 1.2
and 10
Seal any tapped bores still open with plugs.
Mount lever 203.
9.2.3 Ball valve with actuator
Mount spring gland follower 502 (at 3", 4", 6" and
8" are 2 spring gland followers) 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. Observe
the actuator position in accordance with the actua-
tor operating manual.
Observe the ball/stem position in accordance with
the position of the actuator.