Any type of refrigeration metering device creates a pressure drop in the refrigerant and with a pressure drop of the refrigerant a temperature drop also occurs. The EX4-EXare stepper motor driven valves that are optimized for the control of liquid or gaseous mass flow in refrigeration systems. Multifunction capability as expansion valve , hot gas bypass, suction gas throttling, head pressure, liquid line actuator and other applications systems.
A basic refrigeration cycle consists of four major elements: a compressor , a condenser , a metering device and an evaporator. The thermal expansion valve (TEV or TXV), as shown in picture below, it’s used for refrigerant flow control and operates at varying pressures resulting from varying temperatures.
The thermostatic expansion valve (TXV) is a precision device designed to regulate the rate at which liquid refrigerant flows into the evaporator. This controlled flow is necessary to prevent the return of liquid refrigerant to the compressor. The TXV separates the high pressure and low-pressure sides of a refrigeration or air conditioning system. Beside the capillary tube, the thermostatic expansion valve is used widely in the refrigeration and air conditioning systems.
