Richter KNAP-S/F Series Ball Valves (ASME) - Manual (Page 13)

Series KNA/F, KNAP/F, KNA-D/F, KNAP-D/F,
Page 13
KNA-S, KNAP-S, ASME
9520-080-en_USA Revision 10
TM 8361 Edition 10/2011
9.3 Dismantling ball valve with
ball and stem
It is possible with a ball valve with ball and stem to
replace the seat rings and ball without dismantling
the entire ball valve.
It is equally possible to remove the packing gland
follower, spring gland follower and packing insert?
without dismantling the body.
The entire ball valve must merely be taken apart to
remove the stem.
For sectional drawings, see Section 10.
9.3.1 Ball and seat rings
Move ball 200 into the 'closed' position.
Undo body nuts and bolts.
Remove body end piece 102.
Remove ball 200 from the main body 101 by
swivelling it.
Remove seat rings 401 from the main body 101
and body end piece 102 and replace.
9.3.2 Packing bellows
Remove lever 203.
Dismantle packing gland follower 503 and spring
gland follower 502.
Remove grounding spring washer 557.
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.
Remove retaining washer 526.
Separate thrust ring 405/1 and packing bellows
403 by pushing them apart.
9.3.3 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 9.3.1.
9.4 Assembly ball valve with ball
and stem
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.
Insert stem 202 from inside into the main body
101. In the case of 6" and 8" with an additional
disc 550/1.
Move stem 202 into the 'closed' position.
Swivel ball 200 into the stem 202. Any pressure-
relief or drain bore must lie on the p1 side in the
"off" position. See also Section 6.2.
Mount body end piece 102. Tighten the body
screws to a tightening torque according to Section
1.2 in diametrically opposite sequence.
9.4.1 Packing bellows
Press thrust ring 405/1 into packing bellows 403.
Install retaining washer 526 526 (not in 6" and
8/6").
Press unit into body end piece 102.
Press in grounding spring washer 557.
9.4.2 Ball valve with lever
Mount lever stop 577, spring gland follower 502 (in
3", 4", 6" and 8” they 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.
Seal any tapped bores still open with plugs.
Mount lever 203.
9.4.3 Ball valve with actuator
Mount spring gland follower 502 (in 3", 4", 6" and
8“ they are 2 spring gland followers 502) 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.
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 and stem position in accordance
with the position of the actuator.