Pneumatic controller

Details Pneumatic controller Pneumatic controller

1993-03-19

1994-05-10

Tapolcai, William E.

Automatic temperature and humidity regulation

Ventilator type

Pneumatically actuated

137 85, 236 82, 255 29, F24F 706

Patent

active

053101111

ABSTRACT:
A pneumatic controller configured to regulate the opening and closing of a controlled device in response to a measured variable, such as temperature. The pneumatic controller includes a sensor providing an output proportional to the measured variable as well as a gas supply inlet and a gas outlet. A pneumatic relay is disposed between the inlet and the outlet for regulating the pressure of gas passing through the inlet to the outlet to the controlled device. A pneumatic actuator system is connected to the relay and regulates the relay via cooperation between an inflatable bladder and a pneumatic pilot circuit in the relay. The pneumatic actuator system includes a first electric microvalve which selectively permits passage of a gas into the inflatable bladder and a second electric microvalve which selectively permits passage of a gas out of the inflatable bladder in response to a digital controller connected to the sensor.

REFERENCES:
patent: 2490420 (1949-12-01), Davis
patent: 3300174 (1967-01-01), Urban et al.
patent: 3602241 (1971-08-01), Puster
patent: 3809314 (1974-05-01), Eugelke et al.
patent: 3810578 (1974-05-01), Matthews
patent: 4042173 (1977-08-01), Boyer et al.
patent: 5114070 (1992-05-01), Lilya et al.
patent: 5158230 (1992-10-01), Curran

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