Expansion Devices

This is one of the Basic Components of the refrigeration system.
The expansion valve is situated in the liquid line between the condenser and the inlet of the evaporator.This is one of the basic components of the refrigeration system which are used to control refrigerant flow.It reduce the pressure & temperature of the refrigerant coming from the condenser as per the requirement of the system. And also helps to regulate the flow( Metering ) of refrigerant as per the load on the Evaporator.

Expansion valves do not directly control the ev​aporation temperature. Instead, they regulate the superheating by adjusting the mass flow of refrigerant into the evaporator, and maintain the pressure difference between the highpressure and low-pressure sides. The evaporation temperature depends on the capacity of the compressor and the characteristics and efficiency of the evaporator.
The term "low side" is used to indicate part of the system that acts under low pressure, in this case evaporator. high side is used to indicate part of the system that works under high pressure, in this case the condenser.

Basically Two types of expansion devices :-
1.Variable Restriction Type.
2. Constant Restriction Type.

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