9
KEYSTONE
FIGURE PCS17 KNIFE GATE VALVES
INSTRUCTION, OPERATION AND MAINTENANCE MANUAL
RETRO FITTING BEVEL GEAR OPERATORS
Conversion kits include bevel gear operator
with integral thrust style spindle nut,
conversion mounting plate, appropriate bolts,
and handwheel or drive nut as required.
Existing spindle and yoke posts will be reused.
If spindle or yoke posts require replacement,
contact the factory.
CAUTION
Follow required safety procedure and policies.
Assure line is not pressurized or gate has been
secured to prevent unwanted movement before
disassembly. Use proper lifting and support
techniques when moving valve and or valve
subassemblies.
Tools required
1. Pipe wrench or large crescent wrench
2. Appropriate size open end wrenches or
sockets
Prepare the valve
1. Line should be depressurized or gate
secured prior to disassembly. If valve
is equipped with pin-style lockouts
(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.
Reassembly
1. The conversion kit will be shipped with the
thrust spindle nut installed in the bevel
gear.
2. Place the adapter plate over the 4-Post yoke
legs aligning the holes. (Figure 14)
3. Attach nuts onto 4-post yoke legs securing
the top plate into position.
4. Apply standard bearing grease onto to
exposed spindle thread. (Use material which
meets ASTM 4950 GBLB).
5. Slip the bevel gear over the spindle nut,
engaging the threads. Rotate the handwheel
which will in turn rotate the thrust spindle
nut down the spindle, bringing the bevel
gear into proper position, aligning the bolt
holes.
6. Bolt the bevel gear to the adapter plate.
Do not overstress bolting.
7. Stroke the valve from full open to full closed
making sure all parts are aligned and
working properly. Check bolts for tightness,
the gate and operator assembly should stay
snug with the valve body.
8. If binding or off-center movement of gate is
evident, loosen yoke bolts, stroke gate up
and down a few times, retighten yoke bolts.
Disassembly
1. Using pipe or crescent wrench, remove
handwheel retaining nut from spindle nut.
2. Remove handwheel.
3. Remove (2) or (4) retainer bolts.
4. Pull retainer off
5. Rotate old spindle nut until free from
spindle.
6. Remove nuts from the 4-post yoke legs.
7. Pull existing top plate up and away from
valve.
FIGURE 14
FIGURE 15
Bevel gear actuator
Thrust-style
spindle nut
included
Mount plate
Mount bolts
4-Post Yoke Leg
Spindle
