Gas sealing valve and valve equipped plastic processing installa

Details Gas sealing valve and valve equipped plastic processing installa Gas sealing valve and valve equipped plastic processing installa

1990-03-28

1992-04-07

Michalsky, Gerald A.

Fluid handling

Systems

Multiple inlet with single outlet

251 33, 251 34, 425563, 425564, 425566, F16K 1100

Patent

active

051018586

ABSTRACT:
The valve needle of a gas sealing valve for plastic processing plants may be controlled by a control valve, which in turn is controlled by a working gas volume in order to prevent formation of internal waviness in injection molded articles even under very high gas pressures and to assure high flexibility in production without refitting delays. During plastic mass injection the valve needle seals tightly. During gas return the valve needle remains open until the gas bubble in the mold cavity is completely emptied.

REFERENCES:
patent: 2480712 (1949-08-01), Carbon
patent: 2836153 (1958-05-01), Dyson
patent: 2940123 (1960-06-01), Beck et al.
patent: 3070126 (1962-12-01), Schneider et al.
patent: 4106887 (1978-08-01), Yasuike et al.
patent: 4781554 (1988-11-01), Hendry
Klamm and Feldmann, Gasinnendruckverfahren beim Spritzgiessen Kunststoffe 78(1988)9, pp. 767-771.

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