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Installation, Operation and Maintenance Manual
VCIOM-15792-EN Rev. 0
October 2020
Section 1: General Warnings
General Warnings
1.3
Introducing the Actuator
Bettis GVO LP Double-Acting Pneumatic Low-Pressure Linear Actuators, are suitable for the
operation of linear valves (wedge gate valves, through conduit gate valves) for ON-OFF and
modulating heavy-duty service.
The actuator is made up of a pneumatic cylinder and a mounting pedestal complete with
a joint for the coupling to the valve stem of actuator output stem. The valve is actuated in
opening and in closing position by the actuator pneumatic cylinder that is pressurized in one
or in the other direction.
The linear stroke of the valve is adjustable by means of the external mechanical stop for
upward position and by the adjustment of the coupling of valve stem to actuator joint for
the downward position.
The actuator pedestal has a flange with threaded holes to fix the actuator to the valve.
Emerson can supply different types of control system following Customer’s requirements.
The expected lifetime of actuator is approximately 25 years .
Figure 2
Identification of actuator parts
Manual handpump MHP (optional)
Pneumatic cylinder
Lifting eyelets
MHP (optional) Hydraulic cylinder (for MHP models)
Valve coupling
Valve position indicator
