Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1994-06-22
1995-11-21
Schwadron, Martin P.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
25112902, 251331, F16K 3102, F16K 31126
Patent
active
054679605
ABSTRACT:
A two-way fluid control valve for use in temperature controlled HVAC systems. The control valve includes an engine coolant inlet and an engine coolant outlet. A diaphragm is located between the inlet and outlet and is movable between a closed position in which it prevents coolant flow through the control valve and an open position in which it allows coolant to flow through the control valve. A pressure chamber above the diaphragm is in fluid connection with the common port of a three-way control solenoid. The inlet is in fluid connection with the normally closed port of the solenoid and the outlet is in fluid connection with the normally open port of the solenoid. In an unenergized position, the pressure chamber is maintained at a lower pressure than the coolant pressure in the outlet, allowing the diaphragm to be forced open by the engine coolant, thus allowing engine coolant to flow through the valve. In an energized mode, the pressure chamber is maintained at the same pressure as the inlet, thus allowing a spring to bias the diaphragm into a closed position in which engine coolant is prevented from flowing through the valve.
REFERENCES:
patent: 2282878 (1942-05-01), Newton
patent: 2412490 (1946-12-01), Biggle
patent: 2899972 (1959-08-01), Matthews
patent: 3263693 (1966-08-01), Ages
patent: 3981478 (1976-09-01), Lundsgart
patent: 5195718 (1993-03-01), May
G. M. Rolling et al., "Air Mix versus Coolant Flow to Control Discharge Air Temperature in Vehicle Heating and Air Conditioning Systems", Publication Unknown, Date Unknown.
Green Charles J.
Morris John M.
GT Development Corporation
Lee Kevin L.
Schwadron Martin P.
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