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8540 Valve
September 2021
Installing the Valve in the Pipeline
WARNING
The edges of a rotating disk have a shearing effect that may result in personal injury. To help prevent such injury, stay clear
of the disk edges when rotating the disk (key 3, figure 12).
CAUTION
Damage to the disk will occur if any pipe flanges or piping connected to the valve interfere with the disk rotation path. If
the piping flange has a smaller inner diameter than what is specified for schedule 80 piping, measure carefully to be certain
the disk rotates without interference before putting the valve into operation.
CAUTION
Damage to the disk (key 3) sealing surfaces may occur if the disk is not closed when the valve is being installed or removed
from the pipeline. If necessary, use a temporary pressure source on the actuator to retain the disk in the closed position
while installing or removing the valve from the pipeline.
1. For Fail‐Open Actuators: It will be necessary to provide a temporary loading pressure to the actuator diaphragm to
move the valve disk 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 disk will open
rapidly.
2. With the disk in the closed position, install line flange gaskets, and install the valve between the pipeline flanges.
Note
The wafer style valves use the standard size spiral wound gaskets.
Select the appropriate gaskets for the application. Gasket types made to ASME 16.5 group or a user's standards can be
used for 8540 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 disk clearance.
6
Instruction Manual
D104709X012
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