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In this video, I am going to talk about WHAT IS EXPANSION VALVE? & DIFFERENT TYPES OF EXPANSION VALVES USED IN REFRIGERATION SYSTEM.

WHAT IS EXPANSION VALVE?
Expansion valves are devices which used in refrigeration system for control the flow amount of refrigerant in system and it also removes the pressure from the flowing refrigerant.

There are two functions of Expansion Valve:
1. It control the flow amount of refrigerant which is be flow in the evaporator.
2. it maintain the difference between high pressure line & low pressure line.

For know different types of expansion valve, first we should know what are expansion valves because it is very helpful to understanding WHAT IS EXPANSION VALVE? & DIFFERENT TYPES OF EXPANSION VALVES USED IN REFRIGERATION SYSTEM.

DIFFERENT TYPES OF EXPANSION VALVES USED IN REFRIGERATION SYSTEM.

1. HAND OPERATED/ MANUAL EXPANSION VALVE.
2. AUTOMATIC EXPANSION VALVE.
3. THERMOSTATIC EXPANSION VALVE.
4. FLOAT VALVE-
A. LOW SIDE FLOAT VALVE.
B. HIGH SIDE FLOAT VALVE.
5. ELECTRONIC EXPANSION VALVE.
6. CAPILLARY TUBE.

1. HAND OPERATED/ MANUAL EXPANSION VALVE.
The hand expansion valve is normally used as a supplementary safety valve installed in a bypass line. It is also commonly used to control the flow rate through oil bleeder lines. this type of valve operates by manually.

2. AUTOMATIC EXPANSION VALVE.
Automatic Expansion Valve regulates the flow of refrigerant from the liquid line to the evaporator by using a pressure-actuated diaphragm. It maintains a constant pressure in the evaporator.
The setback is that it is not efficient if the load fluctuates hence this type is not suitable for use in air conditioning as the load fluctuates a lot during its operation.

3. THERMOSTATIC EXPANSION VALVE.
Thermostatic Expansion Valve uses a valve mechanism to control the flow of liquid refrigerant into the evaporator coil. The flow is controlled by the pressure in the evaporator.

This type of metering device is able to operate well when the load fluctuates and hence is suitable for use in air conditioning system. When the evaporator warms, the valve provides a higher flow rate amd when it cools, it reduces the flow rate.

It is also commonly refer to as TXV, TEV or TX valve. There is a sensing bulb which detects the temperature of the coil and is usually located at a higher temperature within the evaporator.

4. FLOAT VALVE-
Float Valve is actuated by a float that is immersed in the liquid refrigerant. Both low-side float and high side-float are used to control the flow of liquid refrigerant.

A. LOW SIDE FLOAT VALVE.
The low-side float helps to maintain a constant level of liquid refrigerant in the evaporator. It opens when there is no liquid in the evap. and closes when there is liquid in the evaporator.

B. HIGH SIDE FLOAT VALVE.
The high-side float is located at the high pressure side of the system and maintain a constant level of refrigerant in the condenser. When the compressor operates, the condensed refrigerant flows to the float chamber and opens the valve.

5. ELECTRONIC EXPANSION VALVE.
The electronic expansion valve (EEV) operates with a much more sophisticated design. EEVs control the flow of refrigerant entering a direct expansion evaporator. They are controlled by an electronic controller and rotate a fraction of a revolution for each signal sent to them by the electronic controller.

6. CAPILLARY TUBE.
Capillary Tube is a tube with small internal diameter and could be coiled for part of its length. It is installed to the suction line. A filter-drier is sometimes fitted before the tube to remove dirt or moisture from the refrigerant.

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