| 摘要 |
PURPOSE:To operate two switchovers by one driving means by providing a signal-passage which leads out the pressure of the first valve downstream chamber into a pressure-receiving chamber which actuates a diaphragm valve abutting the second valve seat. CONSTITUTION:As for the first passage 2, when a valve body 14 of the first valve seat 5 is opened by a driving means 13, the fluid led in through the first inflow passage 4 flows into the first outflow passage 7 via the first valve seat 5 and the first valve downstream chamber 6. As for the second channel passage 3, on the other hand, the pressure of the first valve downstream chamber 6 is led into a pressure-receiving chamber 18 via a signal-passage 12, thereby acting upon a diaphragm valve 16, causing the second valve seat 9 to be closed. Next, when a valve body 14 of the first valve seat 5 is closed by the driving means 13, the flow of the first chamber passage 2 is stopped and the pressure in the first valve downstream chamber 6 is lowered. As a result, the diaphragm valve 16 is pushed to open by the fluid pressure in the second inflow passage 8, and maintained in the opened state.
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