Positive-type non-return valve

Details Positive-type non-return valve Positive-type non-return valve

1991-05-13

1992-09-29

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Female mold and charger to supply fluent stock under...

With means between charger and mold to cut off flow of...

425563, 425564, B29C 4523

Patent

active

051512823

ABSTRACT:
A positive-type, non-return valve (10) primarily for use with an injection molding machine utilizes a frame (12) which surrounds a coaxial primary chamber (34). The primary chamber (34) is accessed by several passages. Inlets (30) allow material to be fed to a reduced diameter passage (34) adjacent to said primary chamber (32). Outlet passage (42) connects this reduced diameter passage (34) to outlet ports (40). A piston (60) is dimensioned to fit within said primary chamber (32) and reduced diameter passage (34). In a forward position, the piston (60) allows positive flow of material therethrough. In a rearward position, the piston (60) positively blocks flow of material from the inlet (30) to the outlet passage (42). The piston (60) is forced to its rearward position during the injection step.

REFERENCES:
patent: 3438393 (1969-04-01), Godley, II
patent: 3590439 (1971-07-01), Swanson
patent: 4062479 (1977-12-01), Szabo
patent: 4105147 (1978-08-01), Stubbe
patent: 4512733 (1985-04-01), Eichlseder et al.
patent: 4643665 (1987-02-01), Zieger
patent: 4758389 (1988-07-01), Lampl

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