Valve for pressurized container
The valve ( 1 ) for pressurized container, includes a valve body ( 10 ) in which are placed a spring ( 20 ), a valve member ( 30 ), and a cup ( 50 ) having an outer face ( 53 ) and an inner face ( 54 ) and being provided with a central opening ( 52 ) through which a product outlet rod ( 31 ) can pass, the valve body ( 10 ) being fixed to the inner face ( 54 ) of the cup ( 50 ), the valve seal ( 40 ) being pressed against the cup while surrounding the central opening ( 52 ), and the valve body ( 10 ) being fixed to the inner face of the cup ( 50 ) by welding.
1. A valve for pressurized container, comprising:
a valve body in which are placed:
a spring,
a valve member, and
a valve seal, as well as
a cup having an outer face and an inner face and being provided with:
a cylindrical well, and
a central opening through which a product outlet rod can pass, the central opening of the cup being provided in a bottom wall of the cylindrical well,
the valve body being fixed to the inner face of the cup by welding,
wherein the valve seal is placed against the bottom wall of the cylindrical well and pressed against the cup while surrounding the central opening,
wherein the valve body comprises a tubular body provided with
a fixing crown by which the valve body is welded to the cup, and
an annular protrusion surrounding the central opening and forming an annular tapered edge bearing sealingly against the valve seal and pressing the valve seal against the cup in a sealed manner,
wherein the fixing crown penetrates in the cylindrical well, the welding being made between the fixing crown introduced into the well and the bottom wall of the well.
2. The valve according to claim 1 , wherein the inner face of the cup is made of a plastic material, and the valve body is also made of a plastic material.
3. The valve according to claim 2 , wherein the inner face of the cup is made of polypropylene or another polyolefin, and the valve body is also made of polypropylene or another polyolefin.
4. The valve according to claim 2 , wherein the cup comprises at least a metallic outer layer and an inner layer in plastic material.
5. The valve according to claim 1 , wherein the cup comprises at least a metallic outer layer and an inner layer in plastic material.
6. The valve according to claim 5 , wherein the metallic outer layer is in aluminum or tin, and the inner layer is in polypropylene or another polyolefin.
7. The valve according to claim 1 , wherein the valve body is welded to the cup by a discontinuous weld.
8. A method for manufacturing the valve according to claim 1 , comprising:
placing the spring in a bottom of the valve body;
mounting the valve seal on a rod of a valve member to form a valve member/seal assembly;
inserting the valve member/seal assembly into the valve body so that a lower end of the valve member bears against the spring;
then bringing the cup and the valve body toward each other until the valve body is in contact with the inner face of the cup;
welding the cup and the valve body.
9. The method of claim 8 , wherein the valve is a male valve, and during positioning of the cup on the valve, a free end of the rod of the valve member is passed through the central opening of the cup before bringing the cup and the valve body toward each other.
10. The method of claim 8 , wherein the cup and the valve body are welded by ultrasonic welding or by spin welding.
11. The valve according to claim 1 , wherein an edge of the central opening is folded upright.
12. The valve according to claim 11 , wherein the edge of the central opening is folded upright on a side of the outer face.
13. The valve according to claim 1 , wherein a peripheral edge of the cup forms a flat ring.