Sporlan ADRHE-6-0/80 Hot Gas Bypass Valve

1. Basic Information

1. Brand: Sporlan (a professional U.S. refrigeration valve manufacturer)
2. Model: ADRHE-6-0/80
3. Type: External equalizer hot gas bypass valve
4. Connection Spec: 7/8" ODF copper solder connections on both sides; 1/4" external equalizer port at the bottom
5. Adjustable Pressure Range: 0–80 PSIG

2. Core Function & Operating Principle

Function

- Widely applied in refrigerated air dryers, low-temperature cold storage rooms and small refrigeration units to stabilize evaporating pressure. It prevents low-pressure issues including compressor frosting, liquid slugging and overload shutdown protection.
- When system load drops and evaporating pressure falls below the set value, the valve opens automatically. It bypasses high-temperature discharge gas from the compressor to the evaporator inlet to raise pressure and temperature on the low-pressure side.

Operating Logic

1. Full-load normal operation: The valve remains fully closed when evaporating pressure exceeds the set point, with no bypass flow.
2. Low-load operation: Once evaporating pressure drops below the set threshold, the diaphragm pushes the valve plug open to feed hot discharge gas into the low-pressure circuit.
3. Top adjustment knob: Rotate it to change spring preload and adjust the valve opening pressure.

3. Typical Application Scenarios

1. Refrigerated compressed air dryers (most common matching component)
2. Small cold storage & low-temperature display cabinets with reciprocating compressors
3. Mini VRF systems and small air-cooled units for low-load pressure stabilization

4. Structural Features

- Brass valve body with high pressure resistance and corrosion resistance; extended copper tube stubs for easy field brazing installation
- Bottom hex nut external equalizer port to accurately sample real evaporator pressure for superior control precision
- Protective cap on top adjustment screw for on-site opening pressure calibration
- Built-in strainer to block pipeline debris and avoid valve plug sticking

5. Installation & Operation Notes ⚠️

1. Piping layout: Connect one tube to compressor discharge line, the other to evaporator inlet; route the equalizer tube to the evaporator low-pressure side.
2. Brazing protection: Wrap the valve body with wet cloth during welding to avoid high-temperature damage to internal diaphragm components.
3. Pressure adjustment: Turn the adjustment cap clockwise to raise opening pressure; turn counterclockwise to lower opening pressure.
4. Refrigerant compatibility: Compatible with common refrigerants including R22, R404A and R134a; maximum working pressure 400 PSIG.

6. Series Model Differentiation

- ADRS: Internal equalizer hot gas bypass valve
- ADRHE: External equalizer model (the unit shown in the picture), delivers more precise pressure control for circuits with high line resistance
- Digit suffix "6" stands for valve port size; "0/80" refers to the adjustable pressure range of 0 to 80 PSI