Installation; Maintenance - Fisher Design ED series Instruction Manual

Installation

WARNING
Personal injury or equipment damage
caused by sudden release of pressure
may result if the valve assembly is
installed where service conditions could
exceed the limits given in table 1 or on
the appropriate nameplates. To avoid
such injury or damage, provide a relief
valve for over-pressure protection as
required by government or accepted
industry codes and good engineering
practices.
CAUTION
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions. Since some
body/trim material combinations are
limited in their pressure drop and
temperature ranges, do not apply any
other conditions to the valve without
first contacting your Fisher sales office.
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 oriented so that pipeline flow is in the same
direction as the arrow on the side of the valve.
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 Fisher sales office.
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.
Design ED & EAD Class 125-600
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 Fisher sales
office for additional information.
5. With a leak-off bonnet construction, remove the
pipe plugs (keys 14 and 16, figure 18) 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.
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-SEAL live-loaded packing or
HIGH-SEALt live-loaded packing will not require this
initial re-adjustment. 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 Kit sub-section
near the end of this manual.

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.
Note
WARNING
3