Positive-type non-return valve and method of using valve

Details Positive-type non-return valve and method of using valve Positive-type non-return valve and method of using valve

1991-12-11

1993-11-02

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

425563, 425564, B29C 4520

Patent

active

052581586

ABSTRACT:
A positive-type, non-return valve (10) primarily for use with an injection molding machine utilizes a frame (12) which surrounds a first bore (34) and a second bore (32). The second bore (32) is accessed by inlets (30). Outlet passages (40) are located downstream of said inlet (30) and connect second bore (32) with an accumulation area (6). A piston (60) is dimensioned to slidably fit within the first bore (34) and extend into the second bore (32). In a downstream position, the piston (60) allows positive flow of material from the inlet (30) to the outlet (40). In an upstream position, the piston (60) positively blocks flow of material from the inlet (30) to the outlet (40). The piston (60) can be forced to its upstream position at the beginning of the injection step or can be preclosed by maintaining back pressure on the screw (2) prior to injection.

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), Zeiger
patent: 5044926 (1991-09-01), Dinerman et al.
patent: 5112212 (1992-05-01), Akselrud et al.
patent: 5143733 (1992-09-01), Von Buren et al.
patent: 5151282 (1992-02-01), Dray

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