| 摘要 |
A fluid valve ( 10 ) that interrupts the flow of fluid when backpressure ceases. The valve ( 10 ) consists of a valve body ( 20 ) having an inlet ( 22 ), an outlet ( 24 ), a piston chamber ( 32 ), and a backpressure port ( 34 ). The port ( 34 ) is located between the outlet ( 24 ) and the chamber ( 32 ), and a stem bore ( 36 ) is disposed within the valve body ( 20 ) between the chamber ( 32 ), and the inlet ( 22 ) and the outlet ( 24 ). A piston ( 40 ) that includes a restricting stem ( 42 ), is confined within the chamber ( 32 ) and the stem ( 42 ) is positioned within the stem bore ( 36 ). The stem ( 42 ) restricts fluid flow when there is no backpressure, but when backpressure exists the stem ( 42 ) is forced away from the inlet ( 22 ) and the outlet ( 24 ) by the piston ( 40 ) thereby permitting a full flow through the valve ( 10 ). An adjustable compression spring ( 68 ) engages the piston ( 40 ) urging the stem ( 42 ) into the stem bore ( 36 ) when no backpressure exists. The valve ( 10 ) automatically restores full fluid flow when sufficient fluid backpressure is re-established.
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