Instruction Manual
D104016X012
8590 Valve
June 2017
9
Figure 5. Optional Shaft‐to‐Valve Body Bonding Strap Assembly
33
34
Valves with ENVIRO‐SEAL packing systems will not require this initial re‐adjustment. See ENVIRO‐SEAL Packing System
for Rotary Valves Instruction Manual
(D101643X012)
for packing instructions. If you wish to convert your present
packing arrangement to ENVIRO‐SEAL packing, refer to the retrofit kits listed in the parts kit sub‐section on page 21 of
this manual.
Maintenance
Valve body parts are subject to normal wear and must be inspected regularly and replaced as necessary. The frequency
of inspection and replacement depends upon the severity of service conditions. Instructions are given in this section
for: replacing trim components, changing disk rotation or valve action, and mounting and adjusting the actuator.
As used in these instructions, actuator refers to power actuators (such as pneumatic diaphragm, piston actuators, and
rack and pinion actuators).
WARNING
Avoid personal injury and property damage from sudden release of process pressure 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.
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 spring precompression.
D
Use lock‐out procedures to be sure 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 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.
