Backflow-preventing valves for injection-molding machines

Details Backflow-preventing valves for injection-molding machines Backflow-preventing valves for injection-molding machines

1988-09-26

1990-08-28

Chambers, A. Michael

Valves and valve actuation

Valve

Materials

251356, 425559, F16K 5100

Patent

active

049519204

ABSTRACT:
A backflow-preventing valve for use in a screw head of a screw injection-molding machine which has an annular shape and comprises a ceramic member is disclosed and a metallic member. At least a surface portion of a backflow-preventing valve which is brought into contact with a material to be injected and a screw groove or a valve seat is constituted by a ceramic material.

REFERENCES:
patent: 4235418 (1980-11-01), Natalizia
patent: 4349044 (1982-09-01), Schirmer
patent: 4477242 (1984-10-01), Eichlseder et al.
patent: 4529169 (1985-07-01), Johns et al.
patent: 4722679 (1988-02-01), Farrell
patent: 4732364 (1988-03-01), Seger et al.
patent: 4763876 (1988-08-01), Oda et al.

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