Needle nozzle having a valve

Details Needle nozzle having a valve Needle nozzle having a valve

1977-03-03

1979-01-30

Marbert, James B.

Fluid sprinkling, spraying, and diffusing

Fluid pressure responsive discharge modifier* or flow...

Fuel injector or burner

B05B 130

Patent

active

041368290

ABSTRACT:
An injection nozzle for injection moulding purposes has a nozzle body with a feed passage opening which is normally closed by a needle valve. The injected resin, under high pressure, forces the needle valve to retract and open the nozzle. The improvement is a piston on the needle valve acted on by spring means to urge the needle valve to closed position, the needle valve having a valve element which, when the needle valve is fully opened, seals off the cylinder in which the piston moves, thereby to prevent entry of injection material into the cylinder. The cylinder may optionally have a charge of gas under high pressure in it, or a material which produces such a charge under the operating conditions of the nozzle.

REFERENCES:
patent: 1891340 (1932-12-01), Ammirandoli et al.
patent: 3295169 (1967-01-01), Moslo
patent: 4010903 (1977-03-01), Sakuri et al.

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