Dispensing valve for an aerosol-type container enabling gaseous fluid recharging

A high pressure gas injection valve, comprising:

• 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;
• 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 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, 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;
• and
• 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 in the valve bore proximate said first seal ring only when the valve pin is depressed by the second predetermined amount;
• and
• wherein each of said first and second bypass portions comprises a bypass passage bored in said valve pin to intercommunicate two different points which are axially spaced with respect to each other and which are located on the outer peripheral wall of said valve pin.

A high pressure gas injection valve, comprising:

• a valve casing fitted into an opening portion of a gas bottle, said valve casing having a valve bore;
• a valve pin slidably received in the valve bore;
• first and second seal rings axially spaced with respect to each other along the valve bore wall to respectively provide first and second seals which engage a 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 chamber defined in the valve bore between the first and second seal rings for retaining a fixed amount of high pressure gas prior ejection;
• a gas passage bore formed in said valve pin for intercommunicating a first port formed in an upper face of a tip of said valve pin and a second port 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 bore being located to open into the substantially cylindrical hollow above said second seal ring when said valve pin is depressed from a closed valve position by a first predetermined amount and to open into said fixed-quantity chamber below said second seal ring when the valve pin is depressed from the the closed valve position by a second predetermined amount which is greater than the first predetermined amount;
• a first bypass portion formed in said valve pin for intercommunicating the interior of the gas bottle and said fixed-quantity chamber when said valve pin is depressed by the first predetermined amount;
• a second bypass portion formed in said valve pin for intercommunicating the interior of the gas bottle and said fixed-quantity chamber when the valve pin is depressed by the second predetermined amount;
• and
• a flanged stopper formed at a bottom end of said valve pin and is abuttable with a bottom face of said valve casing to limit upward movement of said valve pin.