Move The Valve Disc To The Closed Position. Observe The Above Warning When Closing The Valve. If A Loading Pressure Is - Fisher 8560 Instruction Manual

8560 Valve
June 2017
1. For Fail‐Open Actuators: It will be necessary to provide a temporary loading pressure to the actuator diaphragm to
move the valve disc to the closed position. Observe the above Warning when closing the valve. If a loading pressure
is required, use caution when working with the valve. If the loading pressure is disconnected, the disc will open
rapidly.
2. With the disc in the closed position, install line flange gaskets, and install the valve between the pipeline flanges.
WARNING
If spiral wound gaskets are to be used with an NPS 3 or 4 CL150 or 300 single flange valve, special spiral wound gaskets
conforming to the dimensions listed in the table 5 MUST be used. Improperly sized gaskets may increase the likelihood of 1)
excessive seat leakage, 2) damage due to contact with valve internals, and 3) external leakage; which may result in personal
injury and/or property damage due to a sudden increase or decrease of pressure within ‐ or release of pressure from ‐ the
pipeline. The special dimension spiral wound gaskets can be obtained from your local spiral wound gasket vendor.
Note
The remaining single flange valve sizes (NPS 6 through 12) and all wafer style valves (NPS 2 through 12) use the standard size spiral
wound gaskets. Only the single flange valves in the sizes and pressures listed in table 5 require special spiral wound gaskets.
Select the appropriate gaskets for the application. Flat sheet, spiral wound (NPS 6 through 12), or other gasket types
made to ASME 16.5 group or a user's standards can be used for 8560 valves depending on the service conditions and
applications.
3. Install the flange studs:
Note
Lubricate line flange studs or bolts before inserting them into flanges. If necessary, provide additional support for the control valve
assembly because of its combined weight.
D Flange studs: Install two or more line flange studs into the line flanges to help hold the valve in position while
centering the valve. Carefully center the valve on the flanges to ensure disc clearance.
Figure 5. Optional Shaft‐to‐Valve Body Bonding Strap Assembly
B2434
8
END PLATE OF ACTUATOR
MOUNTING YOKE
CAP SCREW
(KEY 22)
VIEW A‐A
A
VALVE
A
Instruction Manual
D102013X012