Richter BVA Series, Installation And Operating Manual

Page: 12 / 30

Series KNA/F, KNAP/F,
KNA-D/F, KNAP-D/F,
Page 12
KNA-S, KNAP-S,
ASME
9520-080-en_USA Revision 15
TM 9549 Edition 07/2016
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 Chapter 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 Chapter 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
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
Chapter 9.1.1 and 9.1.2 .
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. See also Chapter 6.2 .

Mount body end piece 102 . Tighten the body
screws to a tightening torque according to Chap-
ter 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”, 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 Chapter 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 actua-
tor operating manual.

Observe the ball/stem position in accordance with
the position of the actuator.