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Click on the individual part below to learn how it functions with in your vehicle's A/C System.

compressors, evaporators, condensers, accumulators, orifice tubes, expansion valves, weld-on-barbs, splicer barbs, engine cooling fan, hoses and belts, receiver/dryers

Manufacturer & Supplier of Auto
AUTO AIR AND ELECTRIC OF TAMPA EXPANSION VALVES
Auto Air & Electric of Tampa sells a complete inventory of New & Remanufactured parts. We are a manufacturer and distributor of automobile air conditioning parts and provide automobile air conditioning service and repair. We order supplies directly from the after market manufacturers, if we don't have what you need in stock, we can make it for you.

 

 

The expansion valve's place in the system is at the evaporator inlet. Like any other valve, its job is to control flow; in this case, the amount of refrigerant entering the evaporator. Since system operating conditions vary (sometimes high cooling demand, sometimes low cooling demand) it is necessary to be able to adjust the amount of refrigerant entering the evaporator. For any given operating condition, if we were to to allow too much refrigerant to enter the evaporator, it would get too cold, and the moisture collected on it could freeze. This would not allow the hot interior air to pass through its fins, and the refrigerant flowing inside the evaporator would not be able to absorb the head from the air. This would eventually bring cooling to a halt. If we were to allow too little refrigerant to enter the heat, which would also result in inadequate, or no cooling. This process of varying refrigerant flow based on system cooling demand is referred to as "metering" the refrigerant into the evaporator.

So how does the expansion valve know how much refrigerant to meter into the evaporator, and how does it do it? First the "how it does it," and its quite simple. Expansion valves contain a movable rod which travels up and down inside the valve. As the rod moves up and down, it can open and close the passage inside the valve that serves as the flow path for the refrigerant. The valve does not have to be fully opened or fully closed at any given time. Its position can vary, or modulate, between the fully opened and fully closed positions. Because of this, it can very accurately meter the precise amount of refrigerant needed to meet any given cooling demand.

This internal passage inside the TXV is much smaller than that of the refrigerant flow pipe that delivers the refrigerant to it. Because of this, as the refrigerant flows through this passage, its pressure drops, and it becomes a low pressure liquid. So as you can see, the expansion valve also serves as a "dividing line" between the high and low pressure sections of the system.

Now the "how does it know how much" part. This is based on evaporator temperature. The warmer the evaporator is, the more refrigerant flow needed, and vice-versa. The expansion valve has a temperature sensing device called a sensing bulb. The sensing bulb measures the temperature of the evaporator and sends a signal to the movable rod inside the expansion valve. This signal corresponds to the amount of refrigerant needed, the rod moves to the propper position, and the correct amount of refrigerant enters the evaporator.

An expansion valve could somewhat be likened to the thermostat in an engine cooling system:

- The thermostat controls the flow of coolant from the engine to the radiator based on cooling system temperature.

- The exapnsion valve controls the flow of refrigerant entering the evaporator based on evaporator temperature, or A/C sytem load/cooling demand.

 


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