TXV INDUSTRIES INC
or thermostatic expansion valve (often abbreviated as TEV · TXV · or TX valve ) · this is the cycle that makes air conditioning · or air cooling · possible. A basic refrigeration cycle consists of four major elements: a compressor · a condenser · air conditioning occurs. The cycle starts when refrigerant enters the compressor in a low-pressure · moderate-temperature · usually ambient air. In order to produce a cooling effect from the higher pressure liquid · the flow of refrigerant entering the evaporator is restricted by the expansion valve · reducing the pressure and allowing isenthalpic expansion back into the vapor phase to take place · and as the temperature drops this force will decrease · and thus a significant portion toward the end is not providing cooling. Therefore · by regulating the superheat to a small value · typically only a few °C · the heat transfer of the evaporator will be near optimal · without excess liquid refrigerant being returned to the compressor. [ · 1 ] · In order to provide an appropriate superheat
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91; 1 ] In order to provide an appropriate superheat, a spring force is often applied in the direction that would close the valve, meaning that the valve will close when the bulb is at a lower temperature than the refrigerant is evaporating at. Spring-type valves may be fixed, or adjustable, although other methods to ensure a superheat also exist, such as the sensing bulb having a different vapor composition to the rest of the system. Some thermal expansion valves are also specifically desig
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