Thermal expansion valves are also known as expansion valves. The length of the device ranges from 65-185mm and more, breadth from 56-118mm and more, height from 80-125mm, diameter from 70-126mm, size from ½-4 inch and more. It can be powered by using hydraulic, pneumatic and solenoid sources and has an operating temperature up to -40 to 400 degree celsius. It is commonly used as mechanical device in air-conditioning or refrigeration system for regulating refrigerant material pressures.