Pentair KEYSTONE F793 Installation And Maintenance Instructions

KEYSTONE
www.pentair.com/valves
Rotary pneumatic positioner F793
Installation and Maintenance Instructions
Operation
Mounting to Pentair's PremiAir and Keystone's F79U, F79E, F790 and F796 series actuators.
1. For standard direct action operation (increasing signal to open actuator), ensure that the actuator
is in its CLOSED (fully clockwise) position, and that the flats on top of the positioner shaft are at
right angles to the longitudinal axis of the positioner.
For reverse action (increasing signal to close actuator), ensure that the actuator is in its OPEN
(fully anti-clockwise) position and that the flats on top of the positioner shaft are parallel to the
longitudinal axis of the positioner.
2. Fit the positioner to the top face of the actuator, using the correct mounting kit, so that the
longitudinal axis of the positioner is parallel to the actuator cylinder axis.
3. Ensure that the feedback cam in the positioner is correctly fitted with the correct range profile
bearing against the feedback arm roller.
(Positioners are stocked to suit 3-15 psig and direct action).
For direct action, ensure that anti-clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
For reverse operation, ensure that clockwise rotation of the positioner shaft will cause the cam to
compress the spring.
4. Connect the air ports as shown in Fig. 1 for direct action and in Fig. 2 for reverse action.
Feedback Cam
Figure 1 - Direct operation
Feedback Cam
Figure 2 - Reverse operation
Pentair reserves the right to change the contents without notice
Air
Signal supply
(on underside)
To actuator To actuator
open port close port
Air
Signal supply
(on underside)
To actuator To actuator
close port open port
HDLDS-0046-EN-1309
Exhaust
Exhaust