SANHUA THERMOSTATIC EXPANSION VALVE (RFGB SERIES)

Key Features of Sanhua RFGB Series TXVs

The RFGB series is a reliable, mechanical solution for controlling superheat in small-to-mid capacity refrigeration and air conditioning systems.

• Core Function: Superheat Control: The primary function is to regulate the mass flow of refrigerant into the evaporator precisely to maintain a desired level of superheat at the evaporator outlet, ensuring the compressor is protected from liquid floodback.

• Compact Design with Fixed Orifice: These valves feature a compact, space-saving design with a built-in, fixed orifice. This simplifies installation and ensures a specific capacity.

• Thermostatic Charge Technology: Utilizes cross-charge technology in the power element and thermal bulb, which provides consistent and reliable superheat control across various evaporating temperatures, particularly in medium and low-temperature applications.

• MOP Function Available (Maximum Operating Pressure): Models can be provided with a Maximum Operating Pressure (MOP) charge. This feature limits the maximum evaporating pressure to protect the compressor from excessive discharge temperatures or overloading during startup.

• Configurable Body Shapes: The valve body is available in different configurations to suit various installation requirements:

  • Angle Shape: Typically comes with a fixed, non-adjustable superheat setting (factory set).

  • Straight-Through Shape: Often comes with an adjustable superheat setting, allowing for on-site tuning.

• External Equalizer Option: Available with an external pressure equalization port (e.g., 1/4″ ODF or 6mm ODF), which is used to sense the pressure drop across the evaporator for accurate superheat control, especially necessary for larger evaporators.