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Supermarket refrigerated showcase internally balanced thermal expansion valve
supermarket refrigerated showcase internally balanced thermal expansion valve
internally balanced thermal expansion valve consists of valve body, valve seat, valve needle, regulating rod seat, regulating rod, spring, filter, transmission rod , Temperature sensing bag, capillary tube, air box cover and sensing film. The supermarket refrigerated showcase is filled with a temperature sensing working fluid (freon or other volatile liquids), which is fastened to the return air pipe at the outlet of the evaporator to feel the temperature change of the return air.
Installation position: The valve body is installed at the entrance of the evaporator, and the temperature sensing bulb is installed on the horizontal return pipe of the evaporator, between the outlet of the evaporator and the suction port of the compressor. Working principle of
: The flow of refrigerant is automatically adjusted by sensing the superheat of the refrigerant vapor at the outlet of the evaporator through the temperature sensor to maintain a constant superheat of the evaporator. When the liquid supply of the evaporator is too small, the superheat of the steam at the outlet of the evaporator will increase, and the temperature and pressure of the temperature-sensitive working fluid will increase. The valve core is pushed down through the ejector rod, and the valve opening becomes larger, and the liquid supply Conversely, when the liquid supply is too large, the steam superheat at the outlet of the evaporator becomes smaller, and the valve channel automatically becomes smaller, and the liquid supply decreases accordingly. The water pushes the adjusting rod under the valve to adjust the superheat of the steam. When the system pressure is balanced, the temperature sensing bulb pressure = spring pressure + evaporator inlet pressure. The internally balanced thermal expansion valve is suitable for systems with low evaporator resistance.
Externally balanced thermal expansion valve
Externally balanced thermal expansion valve and internally balanced thermal expansion valve are slightly different in structure. The difference is that the space below the sensing membrane and the outlet of the expansion valve do not communicate with each other, but through a small diameter The balance pipe is connected to the outlet of the evaporator. In other words, the refrigerant pressure at the lower part of the diaphragm of the externally balanced thermal expansion valve is not the evaporation pressure after the valve throttling, but the refrigerant pressure at the outlet of the supermarket refrigerated showcase evaporator.
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