Patent ID: 8181666

Claim:
A switch valve, having an enclosure, a connection opening, a first on-off opening and a second on-off opening, the connection opening and the first and second on-off openings being for respective communication with an interior and an exterior of the enclosure, the switch valve being made switchable between a first state, in which a gas is able to pass through the interior of the enclosure between the first on-off opening and the connection opening, with the second on-off opening closed, and a second state, in which the gas is able to pass through the interior of the enclosure between the second on-off opening and the connection opening, with the first on-off opening closed, the switch value comprising: a first vessel and a second vessel, disposed inside the enclosure, and a first tubular blocking portion and a second tubular blocking portion, disposed inside the enclosure, which is able to be inserted into and pulled away respectively from the first and second vessels, wherein the melted low-melting-point metal is disposed in the first and second vessels, wherein the first vessel is designed to be able to move up and down inside the enclosure, wherein when the first vessel is located at a lower part inside the enclosure, the first blocking portion is pulled away from the first vessel, and the second blocking portion is inserted into the second vessel to contact the melted low-melting-point metal, so that the second on-off opening is blocked by the second blocking portion, thereby it becoming the first state, and wherein when the first vessel is located at an upper part inside the enclosure, the first blocking portion is inserted into the first vessel to contact the melted low-melting-point metal, so that the first on-off opening is blocked by the first blocking portion, and the second blocking portion is pulled away from the second vessel, thereby becoming the second state.