Richter KNA-D/F Series, Installation And Operating Manual

Page: 13 / 32

Series KNA/F, KNAP/F, KNA-D/F, KNAP-D/F,
Page 13
KNA-S/F, KNAP-S/F
to ASME
9520-030-en Revision 19
TM 10477 Edition 05/2022
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 .
♦
Take out grounding spring washer 557 .
♦
The thrust ring 405/1 , packing bellows 403 and
retaining washer 526
(not in 6" and 8“/6“) 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
Chapter 9.3.1 .
9.3.4 Stem
♦
Dismantling as described in section 9.3.1 to 9.3.2 .
♦
Undo screw connection body end piece 102 / main
body 101 .
♦
Remove body end piece 102 .
♦
Remove ball 200 and stem 202 in closed position.
Make sure that you do not damage the body lining.
♦
Swivel ball 200 from stem 202 .
9.4 Assembly
♦
Prior to assembly all parts are to be cleaned and
the plastic-lined parts 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"/6" 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 greased
housing screws cross over with a tightening torque
according to
section 1.3 .
9.4.1 Packing bellows
♦
Press thrust ring 405/1 into packing bellows 403 .
♦
Install retaining washer 526 (not in 6" and 8/6").
♦
Press unit into main body 101 .
♦
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“/6“ they are 2 spring gland follow-
ers) and packing gland follower 503 . Tighten
packing nuts until there is no gap between packing
gland follower and spring gland follower. See
Section 1.3 and 10.4 .
♦
Seal any tapped bores still open with plugs.
♦
Mount lever 203 .