| 摘要 |
<p>A valve comprises a hollow valve seat member having a plurality of openings formed therein and a hollow valve member adapted to be moved under an increased water pressure in a pressure chamber to close the openings in the seat member when water reaches its predetermined level. A manually operating valve member is provided to relieve the water pressure in the pressure chamber, thereby allowing movement of the hollow valve member away from the valve seat member.</p> |
