Control apparatus for the low pressure evaporator of a refrigera

Details Control apparatus for the low pressure evaporator of a refrigera Control apparatus for the low pressure evaporator of a refrigera

1980-03-31

1981-09-29

Wayner, William E.

Refrigeration

Automatic control

Refrigeration producer

137413, 236 80G, F25B 4104

Patent

active

042915449

ABSTRACT:
The invention relates to control apparatus for feeding liquified refrigerant to the evaporator of a refrigeration system. A main valve controlled by a differential pressure type servo-element controls the flow of refrigerant to the evaporator. A float type pilot valve has a nozzle and closure member controlled by a float which has a liquid level identical to liquid level in the evaporator. A pilot conduit which extends between the main valve and the pilot valve has first and second throttle units arranged in series. The first throttle unit controls a flow of liquid refrigerant through the pilot conduit to control the main valve. The second throttle unit controls a flow of refrigerant through the pilot conduit which is at least partially in vapor form. This arrangement with two throttle units allows control over a broader proportional range for the settings of the float in the pilot valve.

REFERENCES:
patent: 2266069 (1941-12-01), Phillips
patent: 2664916 (1954-01-01), Conley
patent: 3401605 (1968-09-01), Born

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