Pressure balanced valve stem

Details Pressure balanced valve stem Pressure balanced valve stem

1992-12-14

1994-02-22

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...

2643289, 425566, 425570, B29C 4523

Patent

active

052882250

ABSTRACT:
Apparatus includes a mold cavity and a molten plastic inlet channel for communication with the mold cavity for transmission of molten plastic to the mold cavity. A valve stem is provided with substantially no net resulting forces on the valve stem due to melt pressure acting on the projecting area of its upstream and downstream faces.

REFERENCES:
patent: 3241191 (1966-03-01), Nouel
patent: 3491408 (1970-01-01), Natkins
patent: 4095931 (1978-06-01), Reitan
patent: 4173448 (1979-11-01), Rees et al.
patent: 4330258 (1982-05-01), Gellert
patent: 4786246 (1988-11-01), Gellert

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