8
SPINDLE NUT REPLACEMENT INSTRUCTIONS
It is not necessary, or desired, to remove the
yoke assembly to replace the nut.
Tools required
1. Pipe wrench or large crescent wrench
2. Appropriate size open end wrench for
retainer bolts
CAUTION
Follow required safety procedure and policies.
Use proper lifting and support techniques when
moving valve and or valve subassemblies.
Prepare the valve
1. Line should be depressurized or gate
secured prior to disassembly. If valve
is equipped with pin-style lockouts (see
Figure 16, page 10) gate can be locked in
the open or closed position using the lock
pin. If pin-style lockouts are not present,
the gate must be held in place to prevent
unwanted movement. These preCautions
are necessary to keep the gate from moving
KEYSTONE
FIGURE PCS17 KNIFE GATE VALVES
INSTRUCTION, OPERATION AND MAINTENANCE MANUAL
Disassembly
1. It is not necessary or desired to remove or
loosen the stop nut during disassembly.
Removing or loosening the stop nut will
compromise the seat/stroke adjustment.
2. Using pipe or crescent wrench, remove
handwheel retaining nut from spindle nut.
3. Remove handwheel.
4. Remove (2) or (4) retainer bolts.
5. Pull retainer off.
6. Rotate old spindle nut until free from
spindle.
CYLINDER SUPPORT METHODS FOR
HORIZONTALLY OR OFF-VERTICAL MOUNTING
Cylinders require additional support when
mounted in the other than vertical position.
Failure to do so could lead to premature
failure of cylinder and/or valve. The following
illustrations are suggestions, specific details
will have to be determined by customer so
support best suits surrounding area. It is
important that the cylinder/gate alignment be
maintained during valve operation. Supports
should be designed to maintain alignment and
support bulk of cylinder weight.
Reassembly
1. Apply standard bearing grease onto to
exposed spindle thread. (Use material which
meets ASTM 4950 GBLB).
2. Rotate new spindle nut onto spindle until it
bottoms against top plate.
3. Place retainer over spindle nut, lining up the
bolt holes.
4. Replace retainer bolts and nuts, tighten
completely.
5. Place handwheel over spindle nut, aligning
the hex.
6. Attach new handwheel retainer nut, using
pipe wrench or crescent wrench, tighten
completely.
7. Grease as required using grease fitting.
CAUTION
Tie-rod mounted supports are not recommended
on spring-style cylinder actuators.
Stop nut
Spindle
assembly
Retaining nut
Handwheel
Spindle nut
Retainer
Retainer bolt
FIGURE 13
Installation
A
Appropriate tie-in capable of supporting load.
Turnbuckle for adjustment
Saddle style hanger
Installation
B
Appropriate tie-in capable of supporting load.
Saddle style support
Installation
C
Appropriate tie-in capable of supporting load.
Turnbuckle for adjustment
Alternate head-support,
saddle style preferred
