U section butterfly valve,   it's a type of resilient seated butterfly valve,is also referred to as “concentric”,"rubber lined" and “rubber seated” butterfly valve,has a rubber (or resilient) seat between the external diameter of the disc and the internal wall of the valve.

The movement of the disc will determine the position of the butterfly valve.The resilient seated butterfly valve wafer type can work as isolating valve if the disc rotates a full 90-degree turn, the valve is completely opened or closed.

Butterfly valve is a quarter-turn valve that rotates 90 degrees to open or close the media flow. It has a circular disc, also known as the butterfly, found at the center of the body that functions as the closing mechanism of the valve. The disc is connected to an actuator or handle through the shaft, which goes through from the disc to the top of the valve body.

Butterfly valve is also used as flow regulalting valve,if the disc does not rotate to a full quarter-turn, it means the valve is partially open,we can regulate the flow of fluids by various openning angle.

(CV/KV chart of resilient seated butterfly valve is available on request)

Secondly,according to the method of installation,U section butterfly valve ,is also a wafer type valve.

the flanges are designed for each alignment and installation for large size valves.for in our company,resilient seated butterfly valves wafer type and lug type are for the diameter DN32 to DN600.for larger sizes,we use U type flange butterfly valves or double flange butterfly valve,which is another serie of products.

you may find the differences for the installation of resilient seated butterfly valve wafer type,U type and double flange type.