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Series
KNA/F, KNAP/F, KNA-D/F, KNAP-D/F,
KNA-S/F, KNAP-S/F
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 connection
screws should be made in line with the operating
requirements.
♦ For tightening torques, see section 1.3.
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" 8"/6" and 8") are
one unit and it is levered out using 2 screwdrivers.
♦ Undo screw connection body end piece 102 / main
body 101.
♦ Remove body end piece 102.
♦ Remove ball/stem unit 201 in closed position.
Make sure that you do not 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 and 9.1.2.
9520-030-en
Revision 19
TM 10477
Edition
05/2022
to ASME
9.2
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.
♦ Mount ball/stem unit 201 in closed position. Make
sure that you do not damage the body lining.
An additional bore in the ball/stem unit, e.g. for
cavity-free, must lie on the p1 side in the closed
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.
9.2.1 Packing bellows
♦ Press thrust ring 405/1 into packing bellows 403.
♦ Install retaining washer 526 (not in 6", 8"/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", 8"/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 Chapter
1.3 and 10.2.
♦ 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", 8"/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 1.3 and 10.3.
♦ Mount bracket 510 with the opening at right angles
to the direction of flow. See sectional drawing in
Chapter 10.3 and 10.7.
♦ Mount coupling 804 and actuator 850. Observe the
actuator position in accordance with the actuator
operating manual.
♦ Observe the ball/stem position in accordance with
the position of the actuator.
Page 12
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