Table of Contents
Advertisement
Instruction Manual
D101554X012
Maintenance
Valve parts are subject to normal wear and must be inspected and replaced as necessary. The frequency of inspection
and replacement depends upon the severity of service conditions.
Key numbers in this procedure are shown in figures 24, 25, and 26, unless otherwise noted.
WARNING
The Vee‐ball closes with a shearing, cutting motion, which could result in personal injury. To avoid injury, keep hands,
tools, and other objects away from the Vee‐ball while stroking the valve.
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 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
from 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 Always wear protective gloves, clothing, and eyewear when performing any maintenance operations.
D The valve packing area 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.
Packing Maintenance
Key numbers in this procedure are shown in figures 24, 25, and 26, unless otherwise noted. A detailed view of the
packing is also shown in figure 5.
If the valve is equipped with the ENVIRO‐SEAL Packing System, refer to:
D the separate ENVIRO‐SEAL Packing System for Rotary Valves instruction manual (D101643X012) for maintenance
instructions, and
D the Parts List section of this manual for retrofit kits, parts kits, and individual parts.
If the packing is relatively new and tight on the drive shaft (key 6), and if tightening the packing follower nuts does not
stop leakage, it is possible that the drive shaft is worn or nicked so that a seal cannot be made. If the leakage comes
from the outside diameter of the packing, it is possible that the leakage is caused by nicks or scratches on the packing
box wall. Inspect the drive shaft and packing box wall for nicks or scratches while performing the following procedure.
Replacing Packing
When using this procedure, it is recommended that the actuator not be removed from the valve while the valve is still
in the pipeline or between flanges. Valve/actuator adjustments must be made with the valve out of the pipeline. Refer
to the Determining Closed Position portion of the Actuator Mounting section.
Vee-Ball Valves
June 2017
9
Hide quick links:
Advertisement
Table of Contents
