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The invention is directed to a valve for a compressed gas cylinder, comprising: a valve body with an inlet, an outlet and a passage connecting the inlet with the outlet; a shut-off device of the passage with an actuating pin extending in the passage; a check-valve between the shut-off device and the

The invention is directed to a valve for a compressed gas cylinder, comprising: a valve body with an inlet, an outlet and a passage connecting the inlet with the outlet; a shut-off device of the passage with an actuating pin extending in the passage; a check-valve between the shut-off device and the inlet, the check valve comprising a seat and a movable closing member initially held at a position distant from the seat by contact with a guiding surface and movable past the position by the pin so as to cooperate with the seat and prevent a refilling flow of gas from the outlet to the inlet. The guiding surface is on a tubular portion fixed to the valve body and comprising at least one radial aperture so as to allow the refilling flow of gas to by-pass the closing member when in the distant position.

대표청구항 ▼

1. A valve for a compressed gas cylinder, said valve comprising: a valve body with an inlet, an outlet and a passage connecting the inlet with the outlet; anda shut-off device of the passage including an actuating pin extending in the passage, a movable shut-off closing member, a shut-off seat in th

1. A valve for a compressed gas cylinder, said valve comprising: a valve body with an inlet, an outlet and a passage connecting the inlet with the outlet; anda shut-off device of the passage including an actuating pin extending in the passage, a movable shut-off closing member, a shut-off seat in the passage and a spring urging the closing member towards the shut-off seat in a direction of service gas flow from the inlet to the outlet, wherein the pin is screwed to the movable shut-off closing member. 2. The valve according to claim 1, wherein the shut-off seat is formed by a toroid elastomer gasket housed in an annular recess in the valve body, the pin extending through and being in contact with the gasket. 3. The valve according to claim 2, wherein a main direction of a cross-sectional profile of the annular recess in the body forms with a longitudinal axis an angle α comprised between 20° and 70° and is directed to the outlet. 4. The valve of claim 3, wherein the angle α is comprised between 30° and 60°. 5. The valve according to claim 3, wherein the annular recess is formed in a bevelled section of a cavity forming the gas passage. 6. The valve according to claim 1 wherein the movable shut-off closing member comprises a sleeve with a front end contacting the shut-off seat. 7. The valve according to claim 6, wherein the pin traverses the sleeve and is rigidly fixed thereto. 8. The valve according to claim 7, wherein the pin comprises a shoulder abutting an internal shoulder in the sleeve. 9. The valve according to claim 7, wherein the pin comprises an annular slot housing a gasket in contact with an internal surface of the sleeve. 10. The valve according to claim 6, wherein the pin comprises an axial central bore extending from an open end forming the outlet to an intermediate position, and at least one transversal aperture connecting the bore with a chamber between the sleeve and the pin. 11. The valve according to claim 1, wherein the sleeve comprises an external shoulder designed for abutting an internal shoulder in the passage when the movable shut-off closing member contacts and deforms the shut-off seat beyond a predetermined stroke. 12. The valve according to claim 1 further comprising a check-valve between the shut-off device and the inlet, the check valve comprising a seat and a movable closing member initially held at a position distant from the seat by contact with a guiding surface and movable past the position by the pin so as to cooperate with the seat and prevent a refilling flow of gas from the outlet to the inlet. 13. The valve according to claim 12, wherein the guiding surface is on a tubular portion attached to the valve body and comprises at least one radial aperture so as to allow the refilling flow of gas to by-pass the closing member when in the distant position. 14. The valve according to claim 13, wherein the tubular portion is on a plug comprising the check valve seat and the inlet, the plug being screwed on the valve body. 15. The valve according to claim 14, wherein the passage comprises an axially elongated cavity that is closed at one end by the plug, the cavity being larger than the tubular portion so as to form an annular chamber around a portion for feeding the radial aperture(s). 16. The valve according to claim 12, wherein the check valve closing member is held in the position distant from the check valve seat by friction with the guiding surface. 17. The valve according to claim 16, wherein the guiding surface is cylindrical at the position where the check valve closing member is distant from the check valve seat. 18. The valve according to claim 12, wherein the check valve closing member has a bevelled front face directed to the check valve seat and a cylindrical end face opposed to the front face. 19. The valve according to claim 18, wherein the check valve comprises a spring slip on the cylindrical end face of the check valve closing member and abutting the shut-off device. 20. The valve according to claim 12, wherein the check valve and the shut-off device are configured so that the shut-off device opens and the check valve movable closing member keeps held in its initial distant position when the pin is moved on a partial stroke and the shut-off device opens further and the check valve movable closing member is pushed beyond and freed from its distant position when the pin is moved on a full stroke.