Gas injection valve with two positions of closure
AssigneeSchrader
InventorSandra Lucas
Life of this patent
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Abstract
Charge valve for gas, in particular for carbon dioxide, comprising a seat, drilled with a passage, a shaft movable inside the passage against the compression of a return spring bearing against the seat and an elastomeric seal compressed between the seat and the shaft to close the passage when the shaft is moved into a first closed position, called low-pressure position, wherein a thermoplastic seal comprising a polymer that is deformable but has a hardness higher than that of the elastomeric seal, is added onto the seat or onto the shaft to close the passage when the thermoplastic seal is compressed between the seat and the shaft in a second closed position, called high-pressure position, against an additional compression of the elastomeric seal.
Claims5
Charge valve for gas comprising a seat drilled with a passage, a shaft movable inside the passage against the compression of a return spring bearing against the seat, a first elastomeric seal compressed between the seat and the shaft to close the passage when the shaft is moved into a first closed position, called low-pressure position, a second thermoplastic seal that has a hardness higher than that of the first elastomeric seal, compressed between the seat and the shaft to close the passage when the first thermoplastic seal is still compressed between the seat and the shaft and corresponding to a second closed position, called a high-pressure position, wherein the seat has a recess forming a staged double shoulder, having different diameters, in which the first and second seals, having different hardnesses, are separately lodged.
Dependencies are inferred from the claim text.