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
