Fluid handling – Processes
Patent
1981-05-08
1984-01-17
Barrett, Lee E.
Fluid handling
Processes
137599, 13762412, 137628, 236 1EB, 236 15BG, 431 12, 431 18, 431 62, 432 12, 432 51, F23N 100
Patent
active
044259301
ABSTRACT:
Apparatus and a method for controlling the flow of a fluid to a fluid-actuated system. The system is controlled by a sensor which senses a variable characteristic of the system, such as the air temperature. The apparatus includes a pair of solenoid valves, one valve being set to deliver a first volume of fluid per unit time and the other valve being set to deliver a second volume of fluid per unit time. The solenoid coil of one of the valves responds to the actuation and de-actuation of the sensor. The second valve has a solenoid coil controlled by a pair of switches. One of the switches is responsive to a first timing signal and the second switch is responsive to a second timing signal. One of the switches allows the second valve to be open for a first time interval during which the first valve is open; thereafter, the second valve is closed. The other switch of said pair causes the second valve to be opened after a second time interval following the end of the first time interval and to remain open so long as the sensor has not been de-actuated. Both valves are closed when the sensor is de-actuated.
REFERENCES:
patent: 2048162 (1936-07-01), Kriechbaum
patent: 2517869 (1950-08-01), Grapp
patent: 2808209 (1957-10-01), Bressler
patent: 3076605 (1963-02-01), Holden
patent: 3167251 (1965-01-01), Kriechbaum
patent: 3486732 (1969-12-01), Freeby et al.
patent: 3612500 (1971-10-01), Gramer et al.
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