1
7
3
21
11
20
5
9
17
18
22
23
13
4
6
12
10
2
19
14
15
8
18
16
7
6
10
2
9
15
5
8
14
4
11
1
3
10
15
12
13
13
Keystone
Figure 952 KniFe gate valves
NPS 2 - 24 DiSaSSembly iNStructioNS
© 2012 Pentair inc. all rights reserved.
removal, disassembly and inspection instructions.
Rising spindle valves
• Ensure all parts are clean and free of foreign
material, particularly the chest area between
the gland and valve bore.
• For optimum leak-free service, gate faces
and edges must be smooth, and free of
galling or burring. Repair or replace if
excessively worn or damaged.
• Seating faces in valve bore must be smooth
and undamaged otherwise leakage is likely
to occur. Replace if necessary.
• Check gland sealing faces on top of
valve body. they should be smooth and
undamaged. Repair if necessary.
• Check threads on spindles and bolts -
repair/ replace if necessary.
• Replace lock nuts if threads are stripped
or weakened. These are used as protection
against vibration.
• Check and replace gate guides (13) if necessary.
note:
NPS 2 - 8 F952 valve illustrated
note:
NPS 10 - 24 F952 valve illustrated
www.pentair.com/valves
pplBe-0004-Us 14/07
Removal and disassemBly
1. ensure pipeline is not pressurized and that
any hazardous medium is drained away.
2. Large valves need a chain block or crane to
assist. If large, heavy cylinders are fitted, they
can be removed first if felt necessary:
• Disconnect actuator air lines and power
supplies etc.
• Support actuator, disconnect actuator rod
from valve gate, undo bridge bolts or hold
down bolts, remove actuator from valve.
3. Support valve body and remove all flange
bolts.
4. Remove valve and gaskets from the pipeline.
For nps 2-8 valves
• Loosen gland box nuts (10) to end of pillar
(9) threads. Remove clevis fastener (15).
Remove both bridge nuts (13).
• Remove handwheel (or actuator assembly.
Unscrew both pillars (9) and remove.
For nps 10-24 valves
• Remove gland box nuts (10) and washers
(11, 12). Remove clevis fasteners (19, 20).
• Remove upright bolts (14) and washers (15)
at valve body (1). Remove pillar nut (23) and
washer (22).
5. Withdraw gland box (3) and gate (2) assembly.
6. Remove gate guides (13) from valve body (1).
