Our range of thermal expansion valves (TEVs) from Carel, Alco Controls & Sanhua. These feature a choice of solder or flare connection, and are constructed from various materials including brass, and refrigerants R22, R134A, R404A, R448A, and R449A. These have varying capacities at different evaporating temperatures for each model, roughly ranging from -40° Celsius to 10° Celsius.