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Installation position and operating principle of commercial refrigeration externally balanced thermal expansion valve
author: supermarket refrigerated showcase category: commercial refrigeration Views: 520Time: 2016-08-22
Installation position and operating principle of commercial refrigeration externally balanced thermal expansion valve
When the resistance of the evaporator is large, the evaporator inlet pressure is much greater than the evaporator outlet pressure. The internally balanced thermal expansion valve requires greater valve opening pressure than the externally balanced thermal expansion valve, which increases the degree of superheat and affects the heat transfer effect of the evaporator. Therefore, the externally balanced thermal expansion valve is suitable for systems with large evaporator resistance (when the pressure drop of the refrigerant from the outlet of the expansion valve to the outlet of the evaporator, the corresponding evaporating temperature decreases by more than 3°C).
commercial refrigeration thermal expansion valve adjustment method: when the evaporator superheat is too large or small, and the superheat needs to be adjusted, it can be adjusted through the thermal expansion valve static superheat adjustment rod, which is essentially through the twisting of the adjustment rod To adjust the spring pressure, and then adjust the static superheat. When adjusting the degree of superheat, first remove the protective cap and twist the adjusting rod to adjust the refrigerant flow rate. When the adjusting rod rotates clockwise, the flow of refrigerant will decrease, and the superheat of the evaporator will increase, and vice versa. Only by ensuring that the degree of superheat is within a proper range, can the refrigeration system reach the maximum cooling capacity without causing a wet stroke.
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