| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a pilot type on-off valve capable of being more easily and more inexpensively manufactured than the conventional one, and excellent in backflow prevention performance.SOLUTION: A bleed valve element 6 of a pilot type on-off valve V1 is constituted by using a flexible plate-like or sheet-like member, and is attached to a back surface side of a diaphragm valve element D, and a part of the bleed valve element 6 faces a back pressure chamber side opening part 52a of a bleed hole 52, and is brought into contact with or separated from the vicinity of the back pressure chamber side opening part 52a in accordance with pressure in a primary side water flow passage 11 and the bleed hole 52, and thus, the back pressure chamber side opening part 52a is opened and closed.</p> |
