Fisher EHD series Instruction Manual page 4

EH Valves NPS 8 through 14
June 2017
CAUTION
The valve configuration and construction materials were selected to meet particular pressure, temperature, pressure drop,
and controlled fluid conditions. Because some body/trim material combinations are limited in their pressure drop and
temperature range capabilities, do not apply any other conditions to the valve without first contacting your
office or Local Business Partner.
If hoisting the valve, use a nylon sling to protect the painted surfaces. Carefully position the sling to prevent damage to the
actuator tubing or any accessories. Also, take precautions to prevent personnel from being injured in case the hoist or
rigging slips unexpectedly. Refer to table 4 for valve assembly weights and the appropriate actuator instruction manual for
actuator assembly weights. Be sure to use adequately sized hoists and chains or slings to handle the valve and actuator
assembly.
1. Before installing the valve, inspect it to ensure that the valve body cavity is free of foreign material.
2. Clean out all pipelines to remove scale, welding slag, and other foreign materials before installing the valve.
Note
If installing a valve with small internal flow passages, such as with Whisper Trim III or Cavitrol™ III cages, consider installing an
upstream strainer to prevent the lodging of particles in these passages. This is especially important if the pipeline cannot be
thoroughly cleaned or if the flowing medium is not clean.
3. Install the control valve with the valve body in a horizontal pipeline and the actuator vertical above the valve. Other
orientations may result in shortened trim life and difficulty with field maintenance. Flow through the valve body
must be in the direction indicated by the flow arrow (key 15, figure 12 or 14) on the valve body.
CAUTION
Depending on valve body materials used, post‐weld heat treating might be needed. Post‐weld heat treatment can damage
internal elastomeric, plastic, and metal parts. Shrink‐fit pieces and threaded connections might also loosen. In general, if
post‐weld heat treating is needed, remove all trim parts. Contact your Emerson sales office or Local Business Partner for
additional information.
4. Use accepted piping and welding practices when installing the valve in the line. For flanged valve bodies, use
suitable gaskets between the valve body flanges and pipeline flanges.
5. Install a three‐valve bypass around the control valve if continuous operation is required during maintenance.
6. If the actuator and valve are shipped separately, see the Actuator Mounting procedure.
WARNING
Personal injury could result from packing leakage. Valve packing was tightened prior to shipment; however some
readjustment will be required to meet specific service conditions.
7. If the valve was shipped without packing installed in the packing box, install the packing prior to putting the valve
into service. Refer to instructions given in the Packing Maintenance section of this manual.
4
Instruction Manual
D100392X012
Emerson sales