Pressure setting device

Details Pressure setting device Pressure setting device

1978-11-27

1980-12-30

Goldberg, Gerald

Fluid handling

Self-proportioning or correlating systems

Self-proportioning flow systems

137102, G05D 1620

Patent

active

042417503

ABSTRACT:
In a device in which a positive or negative pneumatic pressure source is coupled with a controlled system through a first electromagnetic valve and the controlled system is coupled with a negative or positive pneumatic pressure source through a second electromagnetic valve or opened therethrough to the air, and which is adapted so that the first and second electromagnetic valves are controlled to open or close to thereby set an air pressure in the controlled system, a deviation between the pressure of the controlled system and the set pressure is detected and the detected deviation signal is converted by a pulse converter into a pulse of the duty ratio or frequency corresponding to the deviation, by which pulse the first and second electromagnetic valves are controlled to open or close.

REFERENCES:
patent: 3858598 (1975-01-01), Carman
patent: 3874407 (1975-04-01), Griswold

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