초록 ▼

A refrigerating system of the type used in supermarkets for refrigerating foods merchandised in refrigerated display cases, utilizes a control valve sensitive to pressures in a surge receiver and the liquid line. The valve opens whenever the receiver pressure drops below that of the liquid line more

A refrigerating system of the type used in supermarkets for refrigerating foods merchandised in refrigerated display cases, utilizes a control valve sensitive to pressures in a surge receiver and the liquid line. The valve opens whenever the receiver pressure drops below that of the liquid line more than a predetermined amount, to force hot gas from the compressor discharge line into the receiver. An elevation of the receiver pressure results, until the predetermined pressure differential between the liquid line and the receiver is re-established.

대표청구항 ▼

In a refrigeration system including a compressor, a condenser, a surge receiver, an evaporator, a discharge line extending from the compressor to the condenser, a liquid line extending from the condenser to the evaporator, a connecting line between the liquid line and the receiver, a return line ext

In a refrigeration system including a compressor, a condenser, a surge receiver, an evaporator, a discharge line extending from the compressor to the condenser, a liquid line extending from the condenser to the evaporator, a connecting line between the liquid line and the receiver, a return line extending from the evaporator to the compressor, an inlet pressure regulating valve in the liquid line adapted to establish and maintain pressures in the liquid and discharge lines at pre-selected, different operating levels, and a receiver pressure control line connected between the compressor discharge line and the receiver, the improvement comprising a differential pressure regulating valve that controls communication between the discharge line and the receiver through the receiver pressure control line, and that is sensitive to the pressure differential between the liquid line and the receiver to establish and maintain the receiver pressure at a value which is a function of said pressure differential, said differential pressure regulating valve being mounted in the receiver pressure line to control flow therethrough.