HEAD PRESSURE BIASED CONTROL VALVE

An automatic control for preventing freezing of the evaporator of an air conditioner including a piston type main valve within the compressor inlet. One side of the main valve is exposed to a control pressure in a space connected by a port to compressor inlet. A control valve in this port is operate...

Ausführliche Beschreibung

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Bibliographische Detailangaben
1. Verfasser:	HEIDORN J,US
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING REFRIGERATION MACHINES, PLANTS OR SYSTEMS REFRIGERATION OR COOLING WEAPONS
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Beschreibung
Zusammenfassung:	An automatic control for preventing freezing of the evaporator of an air conditioner including a piston type main valve within the compressor inlet. One side of the main valve is exposed to a control pressure in a space connected by a port to compressor inlet. A control valve in this port is operated by an expandable, evacuated bellows which opens and closes the valve to maintain a substantially constant pressure in the space. A plunger of small cross section is aligned with the control valve and is exposed to the high pressure discharge of the compressor to tend to open the control valve in response to increased discharge pressure. This lowers the control pressure and allows the main valve to open earlier than during lower discharge pressure operation.