Instruction Manual
D103360X012
24000CVF/SVF Valves
June 2017
4
2. Use 6.4 mm (1/4 inch) O.D. tubing or equivalent for all air lines. If air line exceeds 8 m (25 ft) in length, 9.5 mm (3/8
inch) tubing is preferred. Air lines must not leak. Air pressure not to exceed 2.5 barg (35 psig).
Disassembly
WARNING
If there is evidence of process fluid under pressure leaking from the joint, retighten the valve body/joint nuts. Return to the
Warning at the beginning of the Maintenance section to ensure proper steps have been taken to isolate the valve and
relieve process pressure.
CAUTION
D When assembling or disassembling the valve, do not turn the valve stem while the plug is touching the valve seat. This
will damage the valve's seating surfaces.
D When adjusting the valve stem, do not grip the stem directly with pliers or a wrench. This will damage the surface of the
stem, and cause damage to the packing in the valve. Instead, counter-tighten the two locknuts (key 27) on the stem
(key 5). This will allow you to turn the stem by turning the locknuts (key 27) with a wrench.
D When placing the valve in a vise, do not clamp the rounded sides of the valve. This will distort the shape of the casting,
and will ruin the valve. Caution must be taken not to damage the serrated flange faces.
D Mount the valve in a vise by clamping one flange below the serrated surface. Caution must be taken not to damage the
serrated flange faces.
Actuator Removal
Access to the internal components of the valve body can be accomplished with the actuator removed. For actuator
maintenance see the following instruction manual (D103352X012
).
Air-to-Close Actuators
1. Disconnect the air supply to the actuator and remove the air tubing.
2. Loosen the drive nut (key 9) and then remove the plug and stem (keys 4 and 5) assembly by holding the actuator
stem still while unthreading the plug and stem assembly clockwise.
3. Remove the stem locknuts (key 27), travel indicator (key 58), and yoke drive nut (key 9).
4. Remove the actuator from the valve.
Air-to-Open Actuators
1. Using flexible tubing, apply sufficient air pressure to the actuator to lift the plug off the seat.
2. Loosen the drive nut (key 9) and then remove the plug and stem (keys 4 and 5) assembly by holding the actuator
stem still while unthreading the plug and stem assembly clockwise.
3. Remove the stem locknuts (key 27), travel indicator (key 58), and yoke drive nut (key 9).
4. Remove the actuator from the valve.
5. Disconnect the air supply to the actuator and remove the air tubing.
Valve Body Disassembly
1. After removing the actuator, remove the hex nuts (key 12), lift bonnet (key 8), and plug and stem
(keys 4 and 5) from the valve body (key 1). A new valve body gasket (key 49) should be installed each time the valve
is disassembled.
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