| 摘要 |
<p>A rising plug valve seat (10) for insertion into a frusto-conical receiving hole (2) of a rising plug valve body (1) is disclosed. The rising plug valve seat comprises a substantially frusto-conical side wall (11) with two ports (12, 13) therein, one port (12) being arranged to be aligned with an inlet (3) of a frusto-conical receiving hole in a valve body and the other port (13) being arranged to be aligned with an outlet (4) of a frusto-conical receiving hole in a valve body. At least one of the portions (14, 15) of the side wall between the two ports are, in use, more flexible than the portions of the side wall containing the ports. Alternatively or additionally at least one of the portions (14,15) of the side wall between the two ports has, in use, a reduced contact area with a receiving hole of a rising plug valve body. The reduced contact area, may, for example, be provided by a cut-out, recess or flat portion in one or preferably both of the portions of the side wall between the two ports, The flexibility or reduced contact area of at least one, but preferably both of the portions of the side wall between the ports enables the seat to seal to a receiving hole in a valve body and a mating tip (8) to be inserted into the seat more easily as less force is required to distort the shape of the seat.</p> |
