Method and system for controlling a pressurized fluid and valve

Details Method and system for controlling a pressurized fluid and valve Method and system for controlling a pressurized fluid and valve

1993-12-13

1995-08-22

Michalsky, Gerald A.

Fluid handling

Processes

Involving pressure control

137102, 13759615, 13759616, G05B 1150

Patent

active

054430879

ABSTRACT:
A method and system are provided for controlling a pressurized fluid such as nitrogen gas which may be initially stored at a pressure as high as 20,000 psi. The pressurized nitrogen gas may be utilized in high pressure gas systems such as in gas-assisted injection molding systems or low pressure gas systems such as robotic control and actuators. A valve assembly is utilized in the method and system and includes an electric proportioning device such as a pneumatic servovalve and a pair of pneumatic, fluidly-coupled valves which are piloted by the servovalve to regulate the pressure of the pressurized nitrogen gas. In the method and system, the servovalve operates in a closed loop fashion by utilizing feedback from a feedback device such as a pressure transducer. A controller in the closed loop is responsive to a pressure signal from the pressure transducer and a preset reference signal to provide an error control signal to the servovalve.

REFERENCES:
patent: 4117706 (1978-10-01), Lami
patent: 4241750 (1980-12-01), Furuse et al.
patent: 4555766 (1985-11-01), Wright
patent: 4961441 (1990-10-01), Salter
patent: 5020564 (1991-06-01), Thoman et al.
patent: 5114660 (1992-05-01), Hendry
patent: 5142483 (1992-08-01), Basham et al.
patent: 5257640 (1993-11-01), Delajoud

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