Instruction Manual

Instruction Manual
D103221X012
D3 FloPro Valve
February 2014
5
3. Retighten the socket head screws (key 15) to 3 NSm(26lbfSin).
Maintenance
Refer to figures 7 and 8.
Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and maintenance depends on the severity of the service conditions.
WARNING
Avoid personal injury from sudden release of process pressur e or bursting of parts. 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.
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.
D Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
Valve Plug and Seat Ring Maintenance
Trim Disassembly
Spring-to-Close (Air-to-Open)
Key numbers are referenced in figure 7.
1. Isolatethecontrolvalvefromthelinepressure,releasepressure from both sides of the valve body (key 1), and drain
the process media from both sides of the valve.
CAUTION
The following steps are intended to prevent damage to the valve plug (key 3) and seat ring (key 2) during the removal of
the bonnet and actuator.
2. Pressurize the actuator to a maximum of 2.41 bar (35 psi) to stroke the valve to mid travel. This will raise the valve
plug (key 3) off its seat and expose all of the serrations on the valve stem (key 16).
3. Loosen the hex socket head cap screws (key 15) and lower the flow adjuster (keys 13 and 14) to its lowest position
on the valve stem.