Instruction Manual
D102175X012
EZ-C, ET-C, and EWT-C Valves
October 2014
4
CAUTION
When ordered, the valve configuration and construction materials were selected to meet particular pressure, temperature,
pressure drop, and controlled fluid conditions. Since some valve body/trim material combinations are limited in their
pressure drop and temperature ranges, do not apply any other c onditions to the valve without first contacting your
Emerson Process Management sales office.
Before installing the valve, inspect the valve and pipelines for any damage and any foreign material which may cause
product damage.
1. Before installing the valve, inspect the valve and associated equipment for any damage and any foreign material.
2. Make certain the valve body interior is clean, that pipelines are free of foreign material, and that the valve is
orientedsothatpipelineflowisinthesamedirectionasthearrowonthesideofthevalve.
3. Gas Service: The normal method of mounting for gas service is with the actuator vertical above the valve body.
However, the control valve assembly may be installed in any orientation unless limited by seismic criteria. Other
positions may result in uneven valve plug and cage wear that could result in improper operation. For mounting
assistance, consult your Emerson Process Management sales office.
CAUTION
To avoid possible damage to the packing, do not allow the installed actuator angle to be so flat as to allow liquid inside the
bonnet to come in contact with the packing.
Also, if insulation is applied, do not let the insulation run up the extension bonnet. This could cause the packing to freeze
and be damaged.
Liquid Service: The preferred method of m ounting for liquid service is with the actuator vertical above the valve body.
This will allow a vapor layer to form between the liquid and the packing. If there are piping constraints, the actuator
can be angled slightly from vertical. However, in no case should the angle be so flat as to allow liquid inside the bonnet
to come in contact with the packing. For mounting assistance, consult your Emerson Process Management sales
office.
4. If insulation is applied, make sure it is applied only to the body/bonnet joint. Do not let the insulation run up the
extension bonnet.
5. Use accepted piping and welding practices when installing the valve in the line. For flanged valve bodies, use a
suitable gasket between the valve body and pipeline flanges.
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 before shipment; however, the packing
might require some readjustment to meet specific service conditions.
Valves with ENVIRO-SEALt live-loaded packing will not require this initial readjustment. See the Fisher instruction
manual titled ENVIRO-SEAL Packing System for Sliding-Stem Valves 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
near the end of this manual.
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