| 摘要 |
In accordance with the present invention, these and other problems in the prior art are addressed by providing a valve which comprises a valve body which includes an passage that extends at least partially therethrough, a valve seat which is formed in the passage, a valve member which is movably positioned in the passage proximate the valve seat, a first sealing element which is supported on the valve member and which in a closed position of the valve engages the valve seat to block fluid flow through the passage, and a protective member which is movable relative to the valve member between a first position in which the protective member substantially covers the first sealing element when the valve is in the open position and a second position in which the protective member is retracted from the first sealing element when the valve is in the closed position.
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