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A gas injection valve comprises a valve casing fitted to a gas bottle, a valve pin slidably received in the valve casing, first and second seal rings fitted to the inner peripheral wall of the valve casing, and a fixed-quantity chamber defined between the first and second seal rings for capturing th

A gas injection valve comprises a valve casing fitted to a gas bottle, a valve pin slidably received in the valve casing, first and second seal rings fitted to the inner peripheral wall of the valve casing, and a fixed-quantity chamber defined between the first and second seal rings for capturing therein a fixed amount of gas before injection. The valve pin has a gas passage bore for intercommunicating a first port formed in the upper face of the tip of the valve pin and a second port formed in the outer peripheral wall of the valve pin. The second port is located to open into the substantially cylindrical hollow of the casing above the second seal ring with the valve pin kept in a lifted-up position and to open into the fixed-quantity chamber below the second seal ring during one-step pushing action and two-step pushing action of the valve pin. A first bypass portion is formed in the valve pin for intercommunicating the interior of the gas bottle and the fixed-quantity chamber through a partial space of the substantially cylindrical hollow near the first seal ring in the lifted-up position of the valve pin. A second bypass portion is formed in the valve pin for intercommunicating the interior of the gas bottle and the fixed-quantity chamber through the partial space of the substantially cylindrical hollow near the first seal ring only during the two-step pushing action.

대표청구항 ▼

[What is claimed is:] [1.]a valve casing adapted to be fitted to an opening portion of a gas bottle, said valve casing having a substantially cylindrical valve bore;a valve pin slidably received in the valve bore, said valve pin having a terminal end exposed to an interior of gas bottle so as be exp

[What is claimed is:] [1.]a valve casing adapted to be fitted to an opening portion of a gas bottle, said valve casing having a substantially cylindrical valve bore;a valve pin slidably received in the valve bore, said valve pin having a terminal end exposed to an interior of gas bottle so as be exposed to fluid pressure in the bottle and to be exclusively biased by the fluid pressure toward a closed valve position;first and second seal rings axially spaced along an inner peripheral wall of of the valve bore to respectively provide seals between an inner peripheral wall of the valve bore and an outer peripheral wall of said valve pin, said first seal ring being located closer to an interior of the gas bottle than the second seal ring;a fixed-quantity chamber defined in a portion of the valve bore between said first and second seal rings for retaining therein a fixed amount of gas before injection;a gas passage formed in said valve pin for intercommunicating a first port which is formed in an upper face of a tip of said valve pin with a second port which is formed in the outer peripheral wall of said valve pin and axially spaced apart from the first port by a predetermined distance, the second port of said gas passage being located to open into the valve bore above said second seal ring when said valve pin is in closed valve position and to open into said fixed-quantity chamber below said second seal ring when said valve pin is depressed by a first predetermined amount from the closed valve position against the bias produced bv the fluid pressure, and when depressed by a second predetermined amount which is greater than the first predetermined amount from the closed position;a first bypass portion formed in said valve pin for intercommunicating the interior of the gas bottle and said fixed-quantity chamber through a space in the valve bore proximate said first seal ring only when said valve pin is kept in the closed valve position;a second bypass portion formed in said valve pin for intercommunicating the interior of the gas bottle and said fixed-quantity chamber through the space of the valve bore proximate said first seal ring only when the valve pin is depressed bv the second predetermined amount.