| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve device capable of reducing the size of a drive mechanism for a pilot valve element and excelling in responsiveness.SOLUTION: A valve device 1A comprises: a main valve element 4 dividing a valve element space 20 of a housing 2 into a first pressure chamber 32 and a second pressure chamber 24; a seal member 9 separating the first pressure chamber and the second pressure chamber; a first pilot passage 61 having one end directly or indirectly communicating with a primary passage 31, the other end communicating with the second pressure chamber and a first throttle 62; a second pilot passage 63 formed in the main valve element and having a second throttle 64; a pilot valve element 5 opening and closing the second pilot passage; a drive mechanism 7 driving the pilot valve element in a direction of opening the second pilot passage against biasing force of a bias member 55 by energization; and a pin 8 connecting the main valve element and the pilot valve element. The main valve element is configured to be driven in a direction of opening a secondary passage by a differential pressure between the first pressure chamber and the second pressure chamber, and the seal member includes a spiral ring sliding on the housing.SELECTED DRAWING: Figure 1 |
