| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve device capable of, with a simple configuration, separating a main valve element from a main valve seat and keeping the main valve element in a state of being stably separated.SOLUTION: A valve device comprises: a branch passage 8a communicating with a main valve opening-closing chamber 8 and connected to an intake air source 2; negative pressure elimination means 10 for eliminating negative pressure of the main valve opening-closing chamber 8; and hold means 13 provided in the main valve opening-closing chamber 8 and for holding a main valve element 12 separated from a main valve seat 9. When negative pressure is supplied to the main valve opening-closing chamber 8, the main valve element 12 is separated from the main valve seat 9 by a differential pressure between the main valve opening-closing chamber 8, and an input chamber 6 and an output chamber 7, and the hold means 13 holds the main valve element 12. From this state, when the negative pressure elimination means 10 eliminates the negative pressure of the main valve opening-closing chamber 8, the hold means 13 releases the main valve element 12, and the main valve element 12 sits on the main valve seat 9.SELECTED DRAWING: Figure 2 |
