| 摘要 |
PCT No. PCT/AU96/00263 Sec. 371 Date Jan. 21, 1998 Sec. 102(e) Date Jan. 21, 1998 PCT Filed May 3, 1996 PCT Pub. No. WO96/35067 PCT Pub. Date Nov. 7, 1996A valve device comprising a first fluid port, a second fluid port, a valve seat and a valve member having a control chamber is formed at least in part by the valve member. A first passageway communicates between the control chamber and a first port and a second passageway communicates between the control chamber and a second port. A control valve is associated with at least one of the passageways to permit fluid flow therethrough and to urge the valve member into one of a seated or lifted position. A spring-biased restrictor is disposed within at least one of the fluid passageways to clean and prevent clogging of the fluid passageway.
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