Cartridge Piston Having a Vent Valve
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United States of America Patent
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app pub date -
Oct 12, 2017
filing date -
Oct 21, 2016
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Abstract
A cartridge piston has a venting valve and a valve part that is inserted into a front-side recess of the piston, the recess comprising a through opening and a surrounding annular groove. The valve part consists of a central body passing through said through opening and has a projection coacting with a sealing edge and protruding over the back side of the piston. The valve part also consists of a double-walled wall body located in the annular groove and connected to the central body by a front wall, wherein a venting path passes from the piston front side through an air passage into an interspace of the wall body and a filter path formed between an annular wall of the wall body and an annular wall part of the piston provided between said through opening and said groove, and through an annular gap between said wall part and said central body to said sealing edge.
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