Piloted freeze throttling valve

Details Piloted freeze throttling valve Piloted freeze throttling valve

1974-11-25

1976-06-15

O'Dea, William F.

Refrigeration

Automatic control

Refrigeration producer

62224, 1374893, F25B 4104

Patent

active

039628841

ABSTRACT:
A piloted refrigerant valve for an air conditioning system to control refrigerant pressure within an evaporator to prevent frost accumulation on its exterior surfaces. The valve includes a disc-shaped hollow thermal sensor filled with water which solidifies and expands upon sensing the freezing temperature to cause a pilot valve to block a bleed port and thereby increase the fluid pressure above a reciprocally mounted piston valve. The pressure force produced on the piston valve moves it to a closed position to block refrigerant flow and resultantly to increase refrigerant pressure and temperature in the evaporator. After an initial start-up period of operation, the sensor maintains a position which locates the reciprocal piston valve so as to produce a substantially constant non-freezing temperature of refrigerant in the evaporator.

REFERENCES:
patent: 3452929 (1969-07-01), Douglas
patent: 3614966 (1971-10-01), Orth
patent: 3791578 (1974-02-01), Brand et al.
patent: 3798921 (1974-03-01), Scherer et al.
patent: 3808830 (1974-05-01), Atkinson et al.

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