Refrigeration – Automatic control – Preventing – removing or handling atmospheric condensate
Patent
1975-02-12
1976-05-04
Wayner, William E.
Refrigeration
Automatic control
Preventing, removing or handling atmospheric condensate
62196, 251 45, 236 86, F25D 2100, F16K 3112
Patent
active
039539849
ABSTRACT:
A refrigerant control valve for air conditioning systems of the hot gas bypass type including a bypass passage between the compressor outlet and the evaporator inlet through which refrigerant flow is regulated by a pressure operated valve member one side of which is exposed to compressor outlet pressure and the other side of which is exposed to refrigerant pressure in a control chamber. The control chamber is connected by a bleed passage to the compressor inlet and a Schrader-type bleed valve therein to allow the discharge of refrigerant from the control chamber when open so that an opening pressure differential is established across the valve when the bleed valve is open. A sensor-actuator for the bleed valve is supported near the evaporator outlet in the refrigerant flow therefrom and includes a housing with a rigid wall and a movable wall which encloses an interior space filled with water. The movable wall is supported adjacent to the bleed valve so that when freezing temperatures are sensed, ice formation proceeds to move the movable wall against the bleed valve and open it which reduces the pressure of the control chamber and opens the bypass valve.
REFERENCES:
patent: 917443 (1909-04-01), Jahn
patent: 925812 (1909-06-01), Jahn
patent: 3338517 (1967-08-01), Katchka et al.
patent: 3580500 (1971-05-01), Quinn
patent: 3808830 (1974-05-01), Atkinson et al.
patent: 3834175 (1974-09-01), Jones et al.
General Motors Corporation
MacLean, Jr. K. H.
Wayner William E.
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