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A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the refrigerant that flows out of the evaporator ...
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Thermostatic traps. These remove condensate through the temperature difference of steam vs the liquid phase. The valve is driven through expansion and contraction of an element that is exposed to the heat from steam or condensate. These traps take a temperature drop below the saturation curve to open and remove condensate.
Vapor-compression refrigeration [6] For comparison, a simple stylized diagram of a heat pump's vapor-compression refrigeration cycle: 1) condenser, 2) expansion valve, 3) evaporator, 4) compressor (Note that this diagram is flipped vertically and horizontally compared to the previous one) [7] Temperature–entropy diagram of the vapor-compression cycle.
A small diagram of a refrigeration system with mechanical subcooling and superheating coupled by an internal heat exchanger (IHX) Subcooling is normally used so that when the refrigerant reaches the thermostatic expansion valve, all of it is in its liquid form, thus allowing the valve to work properly.
Wax thermostatic elements transform heat energy into mechanical energy using the thermal expansion of waxes when they melt. This wax motor principle also finds applications besides engine cooling systems, including heating system thermostatic radiator valves , plumbing, industrial, and agriculture .
Pressure drop, electronic valve control, and oil drag, must all be considered. Two staged systems may need to double the pressure handlers installed in the cycle. The diagram displays two different thermal expansion valves (TXV) and two separate stages of gas compression .
A two evaporator single compressor with individual expansion valves for each evaporator after passing through the back pressure valve enters into the compressors and hence there is a significant rise in temperature is observed. This system helps in dropping the pressure from high pressure evaporators with the help of back pressure valves.