Instruction Manual
D104138X012
D2T FloPro Valve
June 2017
6
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.
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Always wear protective gloves, clothing, and eyewear when performing any maintenance operations to avoid personal
injury.
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Disconnect any operating lines providing air pressure or a control signal to the actuator. Be sure the actuator cannot
suddenly open or close the valve.
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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.
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Use lock‐out procedures to be sure that the above measures stay in effect while you work on the equipment.
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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.
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Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Valve Trim Maintenance
Note
The following maintenance procedures apply to both air‐to‐open and air‐to‐close actuator configurations, except for steps 2 and 8
as noted.
Key numbers are referenced in figures 6 and 7.
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.
2.
For air‐to‐open actuator action only,
apply pressure to the actuator to fully stroke it open. This will raise the plug off
its seat so that the valve stem serrations are visible inside the flow adjuster window (see figure 3). Loosen the socket
head screws (key 29) and lower the flow adjuster (key 14 and 15) to its lowest position on the valve stem. Retighten
the socket head screws (key 29) to 3 N
S
m (26 lbf
S
in). Relieve pressure to the actuator, shut off all pressure lines to
the actuator, and disconnect. Use lockout procedures to be sure that the above measures stay in effect while you
work on the equipment.
CAUTION
The preceding step is intended to prevent damage to the valve plug (key 3) and seat ring (key 5) during the removal of the
bonnet and actuator.
3. Unscrew the bonnet from the valve body.