| 摘要 |
PCT No. PCT/AU96/00476 Sec. 371 Date Feb. 4, 1998 Sec. 102(e) Date Feb. 4, 1998 PCT Filed Jul. 29, 1996 PCT Pub. No. WO97/06319 PCT Pub. Date Feb. 20, 1997A piston valve wherein a hollow piston type sleeve has a closed lower end surmounted by a sleeve which has a cylindrical outer surface which slides, and seals against a blank inner cylindrical surface portion of an outer body. Ports in the sleeve are moved into an open position of the valve as they traverse from the bank inner cylindrical surface portion towards the port of the outer body.
|
