Check valve

Details Check valve Check valve

F - Mech Eng,Light,Heat,Weapons

16

K

F16K 15/00 (2006.01) B29C 45/17 (2006.01) B29C 45/18 (2006.01) B29C 45/30 (2006.01)

Patent

CA 2072442

IMPROVED CHECK VALVE ABSTRACT OF THE DISCLOSURE A check valve is provided that is especially useful in gas-assisted injection molding wherein pressurized gas is injected into molten plastic material. A tapered or cone-shaped valve member which seats into a correspondingly tapered or cone-shaped valve chamber provides the means by which the valve seals against reverse flow. Any plastic material entering the gas passageway would contact the base end of the tapered or cone-shaped valve member and not any sealing surfaces. By minimizing contact with the sealing surfaces, the useful lifetime of the check valve is significantly increased.

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