Check valve for a fluid-assisted plastic injection molding appar

Details Check valve for a fluid-assisted plastic injection molding appar Check valve for a fluid-assisted plastic injection molding appar

1991-07-01

1992-09-22

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

264572, 425562, 425563, 425564, B29C 4523

Patent

active

051495465

ABSTRACT:
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 mechanism 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.

REFERENCES:
patent: 4171941 (1979-10-01), Yotsutsuji et al.
patent: 4740150 (1988-04-01), Sayer
patent: 4855094 (1989-08-01), Hendry
patent: 4905901 (1990-03-01), Johnson
patent: 4942006 (1990-07-01), Loren

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