| 摘要 |
The three-level or four-level pressure regulation vaive comprises a body(1) in which a central spool slides. This central spool(28) has two shoulders(31,32) to which are applied, on the one hand, a spring(29) engaging the body, and, on the other hand, a small piston(27). The spool shoulder on which the spring acts throttles the feed fluid on its other face between a chamber into which a feed duct opens and a chamber connected with a return-to-mark duct. The end of the other shoulder of the spool on which the small piston acts islocated in an intermediate chamber fed through two parallel ducts, each having its own throttling device.
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