Maintenance - Emerson Fisher ET Instruction Manual

ET Valve
November 2017
3. The control valve assembly may be installed in any orientation unless limited by seismic criteria. However, the
normal method is with the actuator vertical above the valve. Other positions may result in uneven valve plug and
cage wear, and improper operation. With some valves, the actuator may also need to be supported when it is not
vertical. For more information, consult your
4. Use accepted piping and welding practices when installing the valve in the line. For flanged valves, use a suitable
gasket between the valve and pipeline flanges.
CAUTION
Depending on valve body materials used, post weld heat treating may be required. If so, damage to internal elastomeric
and plastic parts, as well as internal metal parts is possible. Shrink‐fit pieces and threaded connections may also loosen. In
general, if post weld heat treating is to be performed, all trim parts should be removed. Contact your Emerson sales office
or Local Business Partner for additional information.
5. With a leak‐off bonnet construction, remove the pipe plugs (keys 14 and 16, figure 14) to hook up the leak‐off
piping. If continuous operation is required during inspection or maintenance, install a three‐valve bypass around
the control valve assembly.
6. If the actuator and valve are shipped separately, refer to the actuator mounting procedure in the appropriate
actuator instruction manual.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however, the packing
might require some readjustment to meet specific service conditions. Check with your process or safety engineer for any
additional measures that must be taken to protect against process media.
Valves with ENVIRO‐SEAL live‐loaded packing or HIGH‐SEAL live‐loaded packing will not require this initial
readjustment. See the Fisher instruction manuals, ENVIRO‐SEAL Packing System for Sliding‐Stem Valves or HIGH‐SEAL
Live‐Loaded Packing System (as appropriate), 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 Kits section.

Maintenance

Valve parts are subject to normal wear and must be inspected and replaced as necessary. Inspection and maintenance
frequency depends on the severity of service conditions. This section includes instructions for packing lubrication,
packing maintenance, trim maintenance, and ENVIRO‐SEAL bellows seal bonnet replacement. All maintenance
operations may be performed with the valve in the line.
WARNING
Avoid personal injury or 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 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.
4
Emerson sales office or Local Business Partner.
Instruction Manual
D100398X012