| 摘要 |
An electrically-operable fluid pressure control device (10) in which the valve elements are magnetically susceptible discs (51, 52) operable by pot-coil electromagnets (63, 64) to close or not close at separate or simultaneous times respective ports (41, 44). When not closing these ports the discs can close other ports (42, 43) but not both at one time by the opposition of a link member (7) which is also effective to aid the unseating of one disc from the respective port of 42 and 43 when the other disc approaches. The speed and reliability of operation are obtained from this construction by relatively simple and non-critical manufacture. The fluid can be gas or liquid e.g. water/hydraulic oil as no close-tolerance sliding surfaces exist. |
