Fluid handling – Processes – Involving pressure control
Patent
1978-04-12
1979-10-02
Cohan, Alan
Fluid handling
Processes
Involving pressure control
137 84, 137 85, 13762411, G05D 1600
Patent
active
041694856
ABSTRACT:
A system having a vacuum source, a pressure source and a pressure operated control device. A pneumatically operated control unit is provided for increasing a pressure signal from the pressure source to the device as the value of the pressure of the pressure source increases from a first value to a second value and for thereafter decreasing the pressure signal from the pressure source to the device as the value of the pressure of the pressure source further increases from the second value thereof to a third value thereof, the control unit producing the signal in substantially the same manner but at different values for different levels of vacuum at the vacuum source thereof. The control unit can include a temperature responsive valve for substantially linearly changing the magnitude of the signal to the device in relation to a certain temperature range.
REFERENCES:
patent: 3819113 (1974-06-01), Puster
patent: 4022237 (1977-05-01), Wertheimer
patent: 4099539 (1978-07-01), Brakebill
Cohan Alan
Robertshaw Controls Company
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