Installing The Valve - Fisher A11 Instruction Manual

A11 Valve
E0179 / IL
D In certain services (process fluids with high
concentrations of entrained solids, abrasive slurries,
or polymerizing media), valve performance will be
enhanced by installing the valve with the shaft
horizontal to the pipeline.
D Valves supplied for unidirectional shutoff should
be installed with the high pressure at the back
(waterway side) of the disc. A flow tag with an arrow
is provided for proper installation.
The High Performance Butterfly Valve is designed to
allow flow in either direction when in the open
position. When in the closed position, high pressure
should be applied to a specific side of the disc to
provide best performance and optimal service life.
D Valves supplied for bidirectional shutoff, such
as soft or Phoenix III, under normal operating
conditions can (at different times) experience
pressure in both directions; the highest of the two
pressures should be exerted on the preferred side of
the disc. If the two pressures are equal, then the one
lasting the longest period of time should be applied
to the preferred side. A flow tag with an arrow is
provided for proper installation.
If you have questions about proper valve orientation
in a specific application, contact your Emerson
Process Management sales office.

Installing the Valve

WARNING
Always wear protective gloves,
clothing, and eyewear when
performing any installation 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 limits on the
appropriate nameplates, or the
6
Figure 2. View of Stud Bolts
matching pipe flange rating. 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 Maintenance
section in this instruction manual.
When ordered, the valve configuration
and construction materials were
selected to meet particular pressure,
temperature, pressure drop, and
controlled fluid conditions.
Responsibility for the safety of
process media and compatibility of
valve materials with process media
rests solely with the purchaser and
end-user. Since some valve/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 Emerson Process
Management sales office.
For Wafer Style Valves:
1. See figure 3. Install the lower flange bolts first to
form a cradle for the valve.
2. Properly orient the valve according to the specific
application. Be sure the valve is placed in the line so
the flow properly enters the valve. Then, install the
valve and the gaskets between the flanges into the
cradle formed by the flange bolts.
3. Install the remaining flange bolts, making sure
that the gaskets are centered on the gasket sealing
surfaces of the flange and valve body.
4. Tighten the flange bolts in an alternating
criss-cross fashion to a torque value of one-fourth of
CAUTION