| 摘要 |
PCT No. PCT/JP93/01569 Sec. 371 Date Apr. 28, 1995 Sec. 102(e) Date Apr. 28, 1995 PCT Filed Oct. 28, 1993 PCT Pub. No. WO94/10487 PCT Pub. Date May 11, 1994When oil flows from within a seat valve along an oil path in a valve, structure is such that a negative pressure is generated to draw a ball in the direction of the seat valve. That is, the force in the direction of valve closure is actively utilized, the valve does not perform a full stroke in a certain differential pressure range, and increases in a pulsed manner in a minute-stroke state, i.e., in a state where the passage cross-sectional area of the valve is small. Therefore, effective control becomes possible without a large pressure increase.
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