Azbil FloWing VFR - Chapter 3: Actuator; 3-1: Description

Azbil Corporation Actuator
Model VFR - FloWing Eccentric Rotary type Control Valves 3-1
Chapter 3 : Actuator
3-1 : Description
The model VR Actuator is a pneumatic and spring type diaphragm motor designed
specically for rotary type control valves. It holds the valve plug in a position where
the pneumatic force and pneumatic force are mutually balanced.
For proportional control a dedicated posiitoner has been incorporated.
Valve position can be manually adjusted using the handwheel. As the handwheel
is rotated counterclockwise*, the actuator stem moves downward. (The open/close
directions are indicated on the direction indicator plate on the handwheel.)
Figure 3-1 Structure of the actuator
No. Parts name No. Parts name
1 Diaphragm clamping-nut 12 Turnbuckle
2 Diaphragm case (Top) 13 Fork
3 Diaphragm 14 Clamp
4 Stopper 15 Roller
5 Rod end bearing 16 Bearing cover
6 Piston 17 Pointer
7 Case 18 Cam
8 Actuator stem 19 Scale
9 Spring 20 Intermediate bracket
10 Spring compression nut 21 Bracket
11 Locknut