| 摘要 |
The present invention provides a valve assembly comprising a first passageway including a first port, a second port defining a restrictive orifice, a third port, and a first valve seat defining a first orifice, a second passageway extending from the third port and including a minimum cross-sectional area defined by a minimum orifice, and also including a second valve seat defining a second orifice, a first piston sealingly disposed in the first passageway between (i) the first port and (ii) the second and the third ports, and configured to seal the first orifice, and a second piston disposed in the second passageway between the third port and the second valve seat, and configured to seal the second orifice, wherein the minimum cross-sectional area of the minimum orifice is larger than the cross-sectional area of the restrictive orifice, and wherein the second orifice is characterized by a smaller cross-sectional area than that of the first orifice. The present invention further provides a vessel for containing pressurized gas comprising a nozzle, and a valve assembly comprising a first passageway including a first port, a second port defining a restrictive orifice, a third port, and a first valve seat defining a first orifice, a second passageway extending from the third port and including a minimum cross-sectional area defined by a minimum orifice, and also including a second valve seat defining a second orifice, a first piston sealingly disposed in the first passageway between (i) the first port and (ii) the second and the third ports, and configured to seal the first orifice, and a second piston disposed in the second passageway between the third port and the second valve seat, and configured to seal the second orifice, wherein the minimum cross-sectional area of the minimum orifice is larger than the cross-sectional area of the restrictive orifice, and wherein the second orifice is characterized by a smaller cross-sectional area than that of the first orifice.
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