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What is the balancing principle of expansion valve?


Sanheng is a professional manufacturer of Expansion Valve,Thermal Expansion Valve,Air Conditioning Expansion Valve.


P1: The pressure generated by the filling medium in the air box head corresponds to the temperature, acting on the top of the diaphragm;

P2: Evaporation pressure (internal balance is the valve outlet pressure, external balance is the evaporator outlet pressure), acting below the diaphragm;

F: Spring force, acting under the diaphragm.

When the temperature of the air box head decreases, P1<P2+F, the valve opening decreases; when the temperature of the air box head increases, P1>P2+F, the valve opening increases; other forces: such as diaphragm stiffness, transmission component friction Resistance, the force of fluid on the valve core, etc. are not considered in the analysis.


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