Hansen 20-1186, Rate Metering Valve For Auto-Purger

The metering valve meters condensed liquid refrigerant from the high-pressure float switch chamber of the purger into the low-pressure liquid-return line. The refrigerant is filtered through a small flanged strainer prior to the metering valve, which removes any particles that might block the orifice.An indication of proper operation of the metering valve is a frosted liquid feed line from the metering valve to the low-pressure liquid-return line. If the line is not frosted when the purger is in COLLECTING AIR/WATER mode, then the flow of refrigerant through the line may be blocked due to dirt in the metering valve or strainer.