| 摘要 |
1. A valve having a body (11) with a shoulder (14) between two cylindrical bores (12, 13) having a vertical axis, the wider being above the narrower, said shoulder forming a seat for a closure member (42), which has a hole (48) providing communication between the two bores (12, 13) and slides in opposition to a spring (53) to a first abutment (32) to uncover an exit port (20) in the wider bore (12), characterized by an obturator (54) covering the hole (48) by the influence of gravity, and free to traverse the bore (12) to a second abutment through a vertical distance less than that between the first abutment (32) and the top (43) of the closure member (42).
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