To provide a check valve capable of spontaneously circulating fluid of a required pressure at the time of opening the valve.
A flow-in side flow path and a flow-out side flow path are partitioned by a valve seat part projecting from an inner periphery of a sleeve with a hollow part as a fluid flow path, and a water stop valve energized toward the valve seat part with a spring is arranged to the flow-out side flow path. A first seal part on a flow-in side and a second seal part on a flow-out side are provided between the water stop valve and the valve seat part. The first seal part is provided at a peripheral edge of a central hole of the valve seat part communicated with the flow-in side flow path and on an tip side outer face of the water stop valve, and the second seal part is provided between the outer periphery of the water stop valve and the outer peripheral side inner face of the valve seat part. A two-step opening/closing mechanism is provided, such that At the time of flowing the fluid, after the first seal part is opened, the second seal part is then opened, and that the time of stopping the water, after the first seal part is closed, the second part is closed.
KOTANI AKISHI
OKAMOTO HEITA
| JPS422161Y1 | ||||
| JPS56108060U | 1981-08-21 | |||
| JP2007032701A | 2007-02-08 | |||
| JP2000506249A | 2000-05-23 | |||
| JP2007130570A | 2007-05-31 | |||
| JP3127795Y |
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