| 摘要 |
PROBLEM TO BE SOLVED: To solve problems wherein an O-ring of a switch valve is expensive because it is especially made, control is complex, and power required to press a valve element is large due to a large pressure receiving area, causing a large burden to women. SOLUTION: This switch valve has a body (1), a valve casing (2) disposed on an axial line (X), a restraint member (3), the valve element (4), a spring (5), and the O-ring (6). A supply passage (7) of the body is provided with a storage chamber (8) and an attachment chamber (9) on the downstream side. The valve casing is located at the storage chamber, a gas passage (10) is communicated with the supply passage, and an opening portion (11) is formed on the downstream side. The restraint member is air-tightly attached to the attachment chamber to restrain the valve casing, and a penetrated flowout passage (12) opens at an edge face of a truncated cone-shaped portion (13) of the restraint member. The valve element has a truncated cone-shaped portion (15), a large column portion (16) on a large-diameter part side engaged with the passage of the valve casing, and a small column portion (17) on a small-diameter part side engaged with the flowout passage of the restraint member. The O-ring in which the small column portion is penetrated is located at the opening portion, deformed by a spring and gas pressure to be brought into pressure contact with outer-periphery surfaces of both-truncated cone-shaped portions by restoring force. COPYRIGHT: (C)2009,JPO&INPIT
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