First of all, the balance of the thermal expansion valve is based on the balance of force. When running the ice water unit, the upper part of the elastic metal diaphragm is affected by the pressure P3 of the working medium in the temperature sensing package, and the pressure of P1 and the spring force P2 are affected by the pressure of the evaporator outlet. Diaphragm under the action of three forces, up or down, so that the valve hole closed or open, used to adjust the evaporator liquid supply. When the amount of fluid into the evaporator is less than the evaporator heat load, while the outlet of the evaporator vapor superheat increases, the pressure is greater than the top diaphragm under pressure, forcing the diaphragm downward bulge through the mandrel compression spring, and the valve pin to open the top, so that the valve hole for Kaida. Fluid volume increase.
        On the contrary when the need for liquid amount is greater than the evaporator heat load, then exit vapor superheat decreases, temperature in the system pressure is reduced, the force force is less than the bottom of the top of the diaphragm, the diaphragm bulge upward, the elongation of the spring, ejector valve on the move and make a small hole off of the evaporator for the liquid volume also be reduced. The expansion of the thermal expansion valve superheat and the effective heat of the composition, the opening of the heat and the spring preload, the effective superheat and the strength of the spring and the valve needle stroke.
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