Azbil FloWing VFR - 4-2: Pneumatic valve positioner (model VFR); 4-2-1: Description

Azbil Corporation Valve Positioner
Model VFR - FloWing Eccentric Rotary type Control Valves 4-3
4-2 : Pneumatic valve positioner (model VFR)
4-2-1 : Description
The valve positioner is mounted on the model VR actuator and has the function of
positioning the valve plug accurately and rapidly to a position corresponding to the
pneumatic signal received from the controller.
The valve positioner consists of the following components:
• Input gauge
• Output gauge
• Bypass cock
• Input bellows
• Flapper-nozzle mechanism
• Pilot relay
• Cam
• Cam follower
• Feedback spring
• Feedback lever
Output gauge
Input gauge
Supply port
Cover
Cover lock
screw
Figure 4-4 Front view
Bypass cock
Feedback lever
Figure 4-5 View when cover removed Figure 4-6 Rear view