Patent ID: 6874523

Claim:
A liquid shut-off valve device provided with a float valve including a float provided in an upper portion of a sealed container, which receives therein a liquid, and moved according to a liquid level position of the liquid supplied into the sealed container, and an open-close valve for closing a discharge path, which discharges a gas in the sealed container, when the float rises to a predetermined position corresponding to the ascent of a liquid level position, the liquid shut-off valve device comprising flowrate throttle means having a pressure receiving portion receiving as an urge flow or pressure of a gas moving to the discharge path from within the sealed container, a recess projecting above the pressure receiving portion to be hollowed downward to be opened to an underside of the pressure receiving portion, and a flowrate throttle path, the flowrate throttle means moving independently of the float, when the pressure receiving portion is urged prior to closing of the float valve, to cause the gas in the sealed container to be discharged to the discharge path through the flowrate throttle path to throttle a flowrate of the gas moving to the discharge path from within the sealed container, and a connection mechanism provided in the recess of the flowrate throttle means to connect the flowrate throttle means to the float movably in a predetermined range.