Pressure-reducing valve and a controller for a blow-molding...

Details Pressure-reducing valve and a controller for a blow-molding... Pressure-reducing valve and a controller for a blow-molding...

2007-02-20

2007-02-20

McDowell, Suzanne E. (Department: 1732)

Plastic article or earthenware shaping or treating: apparatus

Control means responsive to or actuated by means sensing or...

Feed control of material en route to shaping area

C425S149000, C425S162000, C425S536000, C264S040500

Reexamination Certificate

active

10377692

ABSTRACT:
The invention is a pressure reducing valve for reducing the pressure supplied to a head tooling hydraulic positioning valve and a controller for bypassing the pressure reducing valve in a blow-molding machine. A pressure-reducing valve and electrical controller are used to regulate the pressure of a cylinder that controls the position of a head tooling pin and die assembly in a blow-molding machine. The invention reduces pressure during all time intervals except during a “parison formation” interval of the cycle. The invention is also a process for regulating the pressure of a cylinder that controls the position of a head tooling pin and die assembly in a blow-molding machine and for bypassing the pressure reducing valve in a blow-molding machine.

REFERENCES:
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patent: 0 767 045 (1997-04-01), None

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