| 摘要 |
PROBLEM TO BE SOLVED: To provide a hot-water plug socket capable of preventing breakage of components even when freezing expanding pressure acts in a plug socket main body 10 by freezing of circulated water, and restarting an apparatus while easily and quickly confirming a freezing state, with respect to the hot-water plug socket composed of a pair of plug socket main bodies 10 respectively connected with a pair of outdoor-side pipes, and a case body 2 comprising connection holes 11, 12 receiving the plug socket main bodies 10, and storing a valve element 4 for opening and closing a circulation flow channel and an energizing means 18 for bringing the valve element 4 into closely contact with a valve seat 14 in the plug socket main bodies 10. SOLUTION: The valve seat 14 is disposed at a depth side end of cylindrical members 13 received in the plug socket main bodies 10 in a state of being air-tightly kept into contact with inner peripheral faces of the plug socket main bodies at their outer peripheries and movable forward and backward, the cylindrical members 13 are projected to an indoor side in being moved forward, and a control member for holding the cylindrical members 13 in a locked state, and returning the same to an initial position, is disposed between the case body 2 and the plug socket main bodies 10. COPYRIGHT: (C)2009,JPO&INPIT
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