In an air-cooled compressor, the motor is tightly pressed into the housing, and external air from a condenser or separate fan blows across the compressor body to cool the motor.
Air-Cooled Compressor Overview:
The suction service valve is located at the top left, and the discharge service valve is at the bottom right.
The valve plate holds the reed valves in place, and the head secures the valve plate while separating the suction and discharge vapor.
Compressor Plate and Head:
The plate allows suction vapors to enter the cylinders and directs discharge vapors out.
Larger compressors may have multiple reed valves per cylinder for both suction and discharge.
Suction Service Valve:
Located on the suction side (inlet) of the compressor, this valve opens and closes the gauge port or service port.
It allows for minor repairs, pressure reading, and isolation of the compressor.
Back Seated Position: The valve stem is fully backed out (counterclockwise), closing the gauge port and allowing full flow from the suction line to the compressor. This is the normal operating position.
Service Valve Operations:
Cracked/Mid-Seated Position: The valve stem is turned one full turn (clockwise), opening the gauge port for pressure readings, refrigerant recovery, charging, or evacuation. Turning it three or four turns allows a larger passageway for refrigerant.
Front Seated Position: The valve stem is fully turned in (clockwise), blocking the suction line from the compressor. This isolates the compressor, allowing for tasks like oil addition or compressor efficiency checks.
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