Thermal expansion valve

The thermal expansion valve features a compact body constructed of brass or stainless steel with a polished finish and multiple ports. A thermal bulb senses the superheat of the refrigerant gas at the evaporator outlet, converting this temperature change into internal pressure, which then balances with the spring force and evaporation pressure.
1.The internal balance of the three forces—the temperature sensor, the spring, and the evaporation pressure—enables linear adjustment of the valve opening with load changes, maintaining the system at the optimal operating point.
2.The externally balanced H-type valve body eliminates external components such as the thermal bulb and capillary tube, resulting in a more compact design and improved vibration resistance.
3.Adjusting the spring preload allows for static superheat adjustment from 0–8°C, adapting to different system requirements.
The thermal expansion valve is a key component in refrigeration systems for automatic flow control and maintaining optimal superheat. Its compact design, compatibility with a variety of refrigerants, adjustable superheat, and reliable sealing performance make it a promising option for widespread application in commercial air conditioning, cold storage, industrial cooling, and automotive air conditioning. Correct selection, standardized installation and commissioning, and regular maintenance can maximize the control efficiency of the valve body and improve the energy efficiency and reliability of the overall refrigeration system.