Emerson Bettis Nuclear Series, Operation And Maintenance Manual

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June 2014
Installation and Operation Manual
VA065043 Rev. E
3
Section 3: Installation
Installation
Section 3: Installation
1. Since there are many valve and actuator combinations, it is not practical to
include detailed instructions for each type. Mountings are designed to be
as simple as possible to keep guesswork out of installation. Actuators are
shipped from the factory with the travel stops adjusted for approximately
ninety degree rotation. Generally, it is necessary to make slight stop
adjustments once the actuator is installed on the valve. Refer to the valve
manufacturer's recommendations for specific requirements. When the valve
has internal stops, the actuator should be adjusted at the same points.
NOTE:
The actual "stopping" should be done by the actuator. If the valve does not have
internal stops, adjust the actuator to the full-open position. Using this as a reference
point, rotate the valve closed and adjust to the valve manufacturer's specifications for
total rotation
.
2. Good instrument practices are also recommended. Clean, dry air or gas is
essential for long-service life and satisfactory operation. It should be noted
that new air lines often have scale and other debris in them. This debris can
damage control valves, solenoids, seals, and others.