
Instruction Manual
D103355X012
24000 Valve
June 2017
5
4. Remove actuator from valve.
5. Disconnect air supply to actuator and remove air tubing.
Valve Body Disassembly
1. After removing the actuator, unscrew bonnet (key 8), and plug and stem (keys 4 and 5) from valve body (key 1). A
new body gasket (key 49) should be installed each time the valve is disassembled.
2. Loosen packing spring load by removing the packing follower (key 10).
3. Remove the plug and stem assembly by pulling it out through the bottom of the bonnet (key 8) while rotating the
stem (key 5). This will help prevent damage to the packing components.
Note
Handle the parts carefully to avoid damaging the seating and guiding surfaces. Wipe the parts with a clean soft cloth and examine
for signs of wear or damage.
Lapping the Valve Seat
If valve seat leakage becomes excessive, it may be necessary to lap the valve seat.
Lapping is the process of mating the valve plug to the seat ring, with an abrasive to produce a close fit. When valve seat
leakage becomes excessive, lapping becomes necessary. The plug and seat ring seating surfaces should be free of
large scratches or dents and the contact surface of the seats should be as narrow as possible.
1. Use a good quality lapping compound with a mixture that contains 280 to 600 grit. Apply at several spots around
the plug seating surface. Replace the plug (key 4) in the bonnet (key 8).
2. Screw the bonnet (key 8) loosely into the valve body (key 1) to serve as a guide during the lapping operation.
3. Lap the valve by applying a slight pressure on the stem and rotate the stem in short oscillating strokes
approximately 8 to 10 times or until you see an even and complete lap line. The plug should be intermittently lifted
and turned 90 degrees while lapping to keep the plug and seat ring concentric.
4. Clean the valve seat (key 2) and plug (key 4) thoroughly when the lapping is complete, removing all traces of
lapping compound.
Replacing Packing
Refer to the standard and optional packing constructions (figures 3 and 4) to determine the packing that has been
preinstalled in your valve.
1. Disassemble the valve as directed earlier. Remove the locknuts (key 27) and indicator disk (key 58), and turn the
plug stem (key 5) out through the packing box. Remove the packing box and packing. Push out the old packing by
working from the underside of the bonnet (key 8).
2. For Standard Spring Loaded PTFE V-Ring Packing (figure 3): Carefully insert each piece in exact order shown in
figure 3. Tighten the follower (key 10) until it shoulders on the bonnet (key 8). This will compress the packing spring
(key 6) to enable constant stem sealing throughout packing life.
3. For Optional Molded Graphite Ribbon Packing (figure 4): Carefully insert each piece in exact order shown in figure 4.
Hand tighten packing follower
(key 10). Use a wrench to increase tightness by turning the nut an additional 60 degrees.
Actuator and Valve Body Reassembly
Insert a new valve body gasket (key 49) and install bonnet assembly (key 8). Place the actuator yoke over stem (key 5).
While tilting actuator back, drop yoke drive nut (key 9) over stem (key 5). Run lock nuts (key 27), and travel indicator
(key 58) down as far as possible and counter tighten locknuts (key 27) to lock.