| 摘要 |
<p>PCT No. PCT/SE90/00028 Sec. 371 Date Jul. 16, 1991 Sec. 102(e) Date Jul. 16, 1991 PCT Filed Jan. 15, 1990 PCT Pub. No. WO90/08284 PCT Pub. Date Jul. 26, 1990.A valve arrangement for a pressure fluid, particularly high-pressure oil, has a valve housing (10, 90, 190) with an internal, cylindrical sealing surface (16, 100, 160) which forms a guide for the outer, cylindrical sealing surface (42, 107, 162) of a piston body (18, 106, 138). There is provided a circular groove which accommodates a sealing ring (46, 64, 108, 164). An axially displaceable valve sleeve (30, 70, 122, 156) is disposed coaxially with the two cylindrical sealing surfaces(16, 42, 100, 107, 162, 160) and has a cylindrical valve-sealing surface (40, 74, 124, 158). This valve sleeve is biased by a spring (34, 80, 118, 172) such that one end (36, 82, 126, 174) abuts substantially sealingly a seating (38, 86, 128, 176) at that end of the sealing surface such as to form a closed gap (41, 86, 130, 178) at one end of a channel (32, 73, 132, 145). The valve housing (10, 90, 190) is displaceable axially from a starting position relative to the piston body (18, 106, 138) to an intermediate position in which the sealing ring (46, 64, 108, 164) has been moved from a position on one side of the closed (41, 86, 130, 178) to a position on the other side of the closed gap.</p> |
