| 摘要 |
PROBLEM TO BE SOLVED: To provide a check valve which reduces pressure loss in normal operation, shuts down the valve when a contrary wind blows by occurrence of an explosion accident or the like, maintains the closed state so that a back flow of fire and so forth can be blocked, reduces an installation space by reducing the whole size, and cuts costs. SOLUTION: Inside a check valve body 2 formed in the cylindrical state, a mounting shaft 2S is provided crossing an inner passage 2R, and valve plates 5 and 6 constituted in a pair are rotatably supported by this mounting shaft 2S so that the valve plates 5 and 6 are supported by an air flow in the opened state where the inner passage 2R is opened at a normal time, while at generation of a back flow caused by an explosion or the like, the valve plates 5 and 6 are rotated by its pressure to close the inner passage 2R so as to shut down the inner passage 2R. COPYRIGHT: (C)2003,JPO
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