Butterfly Valve Seats

butterfly valve
(Butterfly Valves) A valve consisting of a cylindrical body with a rotating vane to control flow. Tight Shutoff is obtained by an elastomer body liner into which the vane seats.
A valve consisting of a pair of semicircular plates that are attached to a spindle across a pipe and hinged to allow flow only one way
A valve consisting of a disk rotating on an axis across the diameter of a pipe to regulate the flow, as in the throttles of many engines
a valve in a carburetor that consists of a disc that turns and acts as a throttle
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off.

seats
A thing made or used for sitting on, such as a chair or stool
The roughly horizontal part of a chair, on which one's weight rests directly
seating: an area that includes places where several people can sit; "there is seating for 40 students in this classroom"
(seat) a space reserved for sitting (as in a theater or on a train or airplane); "he booked their seats in advance"; "he sat in someone else's place"
(seat) show to a seat; assign a seat for; "The host seated me next to Mrs. Smith"
A sitting place for a passenger in a vehicle or for a member of an audience