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Electronic expansion valve (EXV)

The electronic expansion valve (EXV) is a control valve driven by a shape memory element (FGL) for use in A/C systems for the chemical refrigerants R134a and R1234yf. This valve is increasingly used in battery cooling of electric or hybdride vehicles. In addition, the valve can also be used as a shut-off valve.

• Drive of the electronic expansion valve is based on a wire made of a shape memory element.
• Application in vehicle air conditioning systems with multiple evaporators in front, rear or roof air conditioning systems in combination with fixed or variable-stroke compressors, where the refrigerant current to the individual air conditioners is to be completely shut off.
• Further use in electric and hybrid vehicles whose batteries are cooled by the vehicle air conditioning system.
• Control via LIN bus.
• No valve hysteresis due to position sensor integrated in the drive
• Different flow characteristics possible by adjusting the valve needle geometry.
• Cartridge version for direct installation in chiller connections
• Valve connections in 0° and 90° versions possible.
• Valve housing available in 2Port and 4Port versions
• Sealing principles: Radial-O-ring or slim-line-seal-washer
• Cooling capacity: up to 3.5ton (11kW)
• Function NC (normally closed)
• Very light weight
• No switching noise
• Control range from 1% to 100% of opening stroke
• Bi-directional flow possible