Insert the valve stem into the coupling
Choose the plug's orientation in the coupling according to the valve's intended location in the plumbing
The actuator is pre-programmed to the closed position.
- Usually, the servo connector pins should point downstream, and the plug's port-sealing O-ring should face upstream.
- Thus, the port O-ring usually faces away from the servo pins. Exceptions occur when the downstream chamber volume must be minimized.
Align the hole in the valve stem with the hole in the coupling.
Secure them together by driving the spring pin to flush with the coupling.

Install the actuator and plug assembly into the valve body.[edit | edit source]

Check the valve stem for proper lubrication free of dust, fibers or other contamination on the plug and O-rings
Choose the actuator's orientation on the valve body
According to the valve's intended location in the plumbing usually, the servo connector pins should point downstream (in the same direction as the arrow on the side of the valve)

Strictly observe the correct "top/bottom" orientation when inserting the plug into the body.
The top has a hole where the stop pin used to be.
The plug valve must be inserted into the top.
The plug passage in the bottom of the body is not sufficiently chamfered to protect the port O-ring from damage during installation.
Exercise care to avoid shearing the surface of the port O-ring, especially on 1/4 valves.
It may help to "tuck" the last part of the O-ring into its groove as it enters the valve body.
Align the actuator frame with valve body and insert valve stem straight into top of valve body.
Make sure that the frame properly holds onto the valve body.
Secure valve stem with the circlip