Azbil Corporation
Model VFR - FloWing Eccentric Rotary type Control Valves iii
General
The model VFR control valve consists of three main sections, namely, a valve body, a
pneumatic actuator, and a valve positioner.
The valve body is of an eccentric rotary type, which features large valve capacity and
high operation stability. It is possible to use this valve for slurry service.
The actuator is a pneumatic and spring type diaphragm motor. The actuator stem
rotates the clamp. The rotational force of the clamp is transmitted to the valve stem
as torque, and the valve plug is securely held in a position corresponding to the
pneumatic signal applied. The actuator has a handwheel for manual control. The
handwheel can be used also as a limiting stopper.
The positioner is a single-action positioner with a pneumatic force balance type
servo mechanism. The cam directly mounted on the valve stem feeds-back the valve
position information to ensure that the valve plug is accurately xed in the position
that corresponds to the applied pneumatic signal.
Actuator
lve body
Air set
Positioner
Composition of model VFR
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