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Instruction Manual
D100380X012
If the adjustment is being performed with the three‐way valve assembly out of the line, temporarily bolt the valve
bodies to the tee to compress the liner faces until there is metal‐to‐metal contact between the valve bodies and the
tee.
Check the rotation of the power valve disk per instructions in the Linkage section. If necessary, adjust the linkage
between the actuator and the power valve.
To check the fully closed position of the slave valve disk, use the partial keyway on the slave valve shaft or measure
equal distances between the slave valve face and the top and bottom of the slave valve disk as described in the Linkage
section. Tighten the locknuts on the tandem linkage when adjustment is complete.
Maintenance
Use table 4 to locate and correct possible leakage or mechanical linkage problems with the valve.
WARNING
Avoid personal injury from sudden release of process pressure. Before performing any maintenance operations:
D Do not remove the actuator from the valve while the valve is still pressurized.
D Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
D Disconnect any operating lines providing air pressure, electric power, or a control signal to the actuator. Be sure the
actuator cannot suddenly open or close the valve.
D Use bypass valves or completely shut off the process to isolate the valve from process pressure. Relieve process pressure
on both sides of the valve. Drain the process media from both sides of the valve.
D Vent the power actuator loading pressure and relieve any actuator spring precompression.
D Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
D The valve packing box may contain process fluids that are pressurized, even when the valve has been removed from the
pipeline. Process fluids may spray out under pressure when removing the packing hardware or packing rings, or when
loosening the packing box pipe plug.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
1. Isolate the control valve from the line pressure, release pressure from both sides of the valve body, and drain the
process media from both sides of the valve.
Disassembly
Key numbers locations are shown in figure 7.
1. Loosen all flange studs or bolts. Remove all but the bottom flange studs or bolts.
CAUTION
To avoid damage to the valve disk caused by the disk hitting the mating flange, be certain the disk is closed before
removing the valve from the pipeline.
9500 Valve
February 2019
9
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