| 摘要 |
PROBLEM TO BE SOLVED: To smoothly perform valve opening operation with small operation force while simplifying the valve opening operation of a valve body, and to downsize a valve device and facilitate operation as compared with a conventional one.SOLUTION: A valve body 3 installed in a valve box 2 so as to open/close, is provided with a sub channel 15 capable of communicating a primary side channel 1A and a secondary side channel 1B opened/closed by the valve body 3, and a sub valve body 16 opening/closing the sub channel 15. Valve differential means B is provided, which actuates the sub valve body 16 to open and then actuates the valve body 3 to open, in linkage with the valve opening operation of valve opening/closing operation means A opening/closing the valve body 3.SELECTED DRAWING: Figure 3 |
