Valve cup for pressure vessel
A valve cup for a pressurised container has an inner face oriented towards the inside of the container, and an outer face. The cup includes a deformable peripheral attachment zone configured to attach the cup to the container, a central opening configured to allow the passage of an outlet shaft of the product, and a bottom wall which surrounds the central opening and comprises a peripheral descending part and a central part. The central part includes a protective zone configured to limit deformation of the central part when the deformable attachment zone of the cup is deformed in order to attach the cup to the container.
1 . A valve cup for a pressure container, having an inner face turned towards an inside of the container, and an outer face, the cup being provided with:
a peripheral deformable attachment area configured for attaching the cup onto the container,
a central opening configured for allowing passage of a product outlet rod, and
a bottom wall which surrounds the central opening and comprises a peripheral descending part and a central part,
wherein the central part is provided with a protection area configured for limiting the deformation of the central part during the deformation of the deformable attachment area of the cup for attaching the cup onto the container,
wherein the bottom wall comprises a turned-up edge forming a rolled edge surrounding the central opening, and
wherein the rolled edge is rolled up a first time in a direction of the outer face of the cup, and a second time in a direction of the inner face of the cup.
2 . The valve cup according to claim 1 , wherein the central part is provided with a planar wall surrounded by the protection area, including the central opening and configured for receiving a valve body on the inner face.
3 . The valve cup according to claim 2 , wherein the bottom wall comprises a turned-up edge forming a rolled edge surrounding the central opening, and wherein the edge forms an angle (B) of between 70° and 110° with respect to the planar wall.
4 . The valve cup according to claim 2 , wherein the protection area comprises a rising and/or descending wall which protrudes from the peripheral descending part, and wherein the planar wall forms an angle (γ) of between 70° and 110° with respect to the rising and/or descending wall.
5 . The valve cup according to claim 1 , wherein the deformable attachment area comprises a deformable descending wall and a bearing edge.
6 . The valve cup according to claim 1 , wherein the protection area comprises a rising and/or descending wall which protrudes from the peripheral descending part.
7 . The valve cup according to claim 6 , wherein a height of the peripheral descending part is greater than a height of the rising and/or descending wall.
8 . The valve cup according to claim 6 , wherein the bottom wall comprises a bend between the peripheral descending part and the rising and/or descending wall.
9 . The valve cup according to claim 6 , wherein the rising and/or descending wall is a rising wall, and in that an angle (α) between the peripheral descending part and the rising wall is less than 90°.
10 . The valve cup according to claim 1 , wherein the peripheral descending part comprises a concave outer face.
11 . The valve cup according to claim 1 , wherein the peripheral descending part comprises a planar frustoconical outer face.
12 . The valve cup according to claim 1 , wherein the deformable attachment area has a height at least three times greater than a height of the peripheral descending part.
13 . The valve cup according to claim 1 , wherein an end of the deformable attachment area is horizontal.
14 . The valve cup according to claim 1 , wherein the deformable attachment area comprises a frustoconical part.
15 . A valve consisting of a cup according to claim 1 , and a valve body with a product outlet rod, the valve body being attached to the inner face of the cup, with the rod passing through the central opening of the cup.
16 . The valve according to claim 15 , wherein the valve body is welded or glued to the inner face of the central part of the bottom wall.
17 . The valve according to claim 15 , wherein the valve body comprises a spring, an obturator and a valve seal.