Instruction Manual
D101643X012
ENVIRO-SEAL System - Rotary Valves
February 2019
3
Installation
Use these instructions to install ENVIRO‐SEAL packing in valves that have standard packing, or when inspecting or
replacing ENVIRO‐SEAL packing.
If you are changing the packing system material from standard graphite to ENVIRO‐SEAL graphite or ENVIRO‐SEAL
PTFE packing, the packing friction for ENVIRO‐SEAL packing will be lower than it was for the standard packing.
Therefore, no change should be needed in actuator sizing.
If you are changing the packing system material from standard PTFE to ENVIRO‐SEAL graphite or ENVIRO‐SEAL PTFE
packing, the packing friction will increase. Contact your
Emerson sales office
to determine if your existing actuator will
be large enough.
WARNING
Always wear protective gloves, clothing and eyewear when performing any maintenance operations to avoid personal
injury.
To avoid personal injury or property damage resulting from the sudden release of pressure, do not install the valve
assembly where service conditions could exceed the limits given in this manual, the appropriate valve instruction manual,
or the limits on the appropriate name plates. Use pressure relieving devices as required by government or accepted
industry codes and good engineering practices.
Check with your process or safety engineer for any additional measures that must be taken to protect against process
media.
If installing into an existing application, also refer to the WARNING at the beginning of the Removing the Actuator section
in this instruction manual.
Removing the Actuator
WARNING
Avoid personal injury from sudden release of process pressure or uncontrolled movement 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.
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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.
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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.
