| 摘要 |
A valve has an elongated body open-ended, with a bore with a center line extending from one end of the body to the other. The bore is interrupted by a fluid tight partition, on both sides of which, ports extend through the wall of the body. An elliptical seat is formed on the outer surface of the body between the ports, the seat or channel being diagonal as viewed in side elevation with respect to the bore center line. A sleeve is rotatably mounted on the body. The sleeve has a smoothly cylindrical bore extending from am inlet end to a diagonal, radially outwardly extending annular shelf, between the first cylindrical bore and a second bore that is radially larger than the first bore. Channel-defining ribs extend parallel to the center line, from the shelf to a point short of the outlet end of the sleeve. The ribs have a radially inner face formed on the same radius as or slightly larger radius than the first bore. A seal in the elliptical seat in the closed position of the valve is in uniform engagement with the smooth cylindrical first bore throughout its perimeter, and in its open position is at least in part in engagement with the radially inner surfaces of the ribs, whereby in the open position, liquid flowing through the ports on one side of the body partition can flow in the channels defined by the ribs to the outlet ports, hence through the valve, but in the closed position, the engagement of the seal with the uniformly smooth, uninterrupted first bore prevents liquid from flowing past the seal.
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