| 摘要 |
A valve system, for controlling the dispensing, in use, of a fluid. The valve system comprises first and second valve members which define a cavity therebetween. The first valve member has a closed position and an open position and provides a seal between an inlet of the valve system and the cavity while in the closed position and allows passage of fluid from the inlet to the cavity while in the open position. The second valve member has a closed position and an open position and provides a seal between the cavity and an outlet of the valve system while in the closed position and allows passage of the fluid from the cavity to the outlet while in the open position. Hence the valve members control the passage of fluid through the valve system. The valve system further comprises means for controlling venting of the cavity dependant upon the relative values of the valve system inlet and outlet pressures.
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