What Is An Orifice Tube? new for 2022

What Is An Orifice Tube?
What Is An Orifice Tube?

What Is An Orifice Tube? Many people don’t know what an orifice tube is, and even those who do may not understand how it works. An orifice tube is a small metal tube that’s inserted into the A/C system. It’s responsible for regulating the flow of refrigerant into the evaporator.
If your car isn’t cooling properly, it may be time to replace your orifice tube. Bring your vehicle to a trusted mechanic and they will be able to replace the orifice tube for you. Keep reading this at amortips.com to obtain useful information about the Orifice Tube.

What Is An Orifice Tube?

What Is An Orifice Tube?
What Is An Orifice Tube?

The orifice tube is a tube that, like the expansion valve, expands refrigerant but cannot regulate flow rate and superheating. An accumulator is always connected to the evaporator outlet with an orifice tube.

What is the purpose of orifice tube?

What is the purpose of orifice tube?
What is the purpose of orifice tube?

The orifice tube is leak-free and valves the amount of refrigerant entering the evaporator to control its temperature. Its diameter also allows for smooth engagement with the evaporator system. Since this part contains no moving parts, vehicles using it must have another method to regulate refrigerant flow.

What are the features and benefits of an Orifice Tube?

What are the features and benefits of an Orifice Tube?
What are the features and benefits of an Orifice Tube?

• Separates the high side from the low side

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• Regulates the flow of refrigerant into the evaporator

• (Creates restriction)

• Refrigerant evaporates when it enters the low-pressure area in the evaporator.

The Purpose of an Orifice Tube in an A/C System

The orifice tube is vital to a car’s A/C system and functions similarly to an expansion valve. The valve helps regulate the flow of refrigerant through the evaporator- which as you know, is the main cooling component of the system. The expansion valve controls this flow by utilizing a modulating rod that opens and closes according to various levels depending on demand for cooling. There is also a sensing bulb within the VALVE  which allows it detect temperature changes within in the evaporator. An orifice tube has no moving parts and is always restricted in the system. The refrigerant flow is regulated by other means, such as cycling the compressor on and off, or utilizing a refrigerant regulating valve within the compressor.

The orifice tube helps to regulate the flow of R-134 refrigerant, which is essential for the A/C to function properly.

When the refrigerant pressure is too high, it freezes onto the evaporator coils, causing them to become excessively cold. This freezing impedes air flow through the coils and eventually causes a failure of the cooling system. When working correctly, the evaporator and refrigerant lines should be chilly to the touch but not frozen. Freezing may be an indication of a problem with the orifice tube, or even too much refrigerant in the system. Many vehicles include a “sight glass” that allows you to inspect the refrigerant stream for air bubbles. A sight glass can assist you in determining whether the problem is within the orifice tube or if it’s due to a lack of refrigerant.

The Purpose of an Orifice Tube in an A/C System
The Purpose of an Orifice Tube in an A/C System

A leaky orifice tube can also cause insufficient refrigerant flow through the evaporator. If this is the case, the amount of refrigerant available to absorb heat from the condenser will be insufficient. When this happens, the A/C won’t operate properly enough to cool down the system. If either the evaporator or refrigerant hose coming from it are warm or hot to the touch, it’s an indication that something isn’t working correctly with the orifice tube. However, there may be a variety of other reasons for this issue.

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The inside diameter of the orifice tube is far less than that of the evaporator, allowing for a greater degree of freedom when it comes to design. When refrigerant enters the evaporator from the orifice tube, it expands. An orifice tube and an expansion valve serve as the division between high and low pressure parts of the A/C system. Because of the small diameter of the passage, an orifice tube is susceptible to clogging from debris within the system. An orifice tube becoming blocked is practically the only way it can fail since it is a very simple component by design.

What happens when an orifice tube is clogged?

What happens when an orifice tube is clogged?
What happens when an orifice tube is clogged?

If the AC evaporator or orifice tube fails, air may enter the vehicle’s air conditioner system unchecked. The evaporator might freeze over, ice to form on the vehicle’s AC vents, or frost to emerge from the vehicle’s AC vents as a result of this.

Where is an orifice tube located?

Where is an orifice tube located?
Where is an orifice tube located?

The orifice tube, also known as the expansion tube, is a key part of any vehicle’s air conditioning. It is located within the system between the condenser and evaporator and has one side that is smaller than the other in order to create more pressure.

Do you have to replace orifice tube?

Do you have to replace orifice tube?
Do you have to replace orifice tube?

If your car’s air conditioner is broken or if it blows warm air, you need to replace the expansion valve, also known as the orifice tube.

F.A.Q What Is An Orifice Tube?

How much does an orifice tube cost?

The average cost to replace an orifice tube according to RepairPal is between $52 and $65 for labor, and  $13 and $15 for parts. These estimates do not include taxes and fees, or your specific vehicle’s location.

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What is the difference between an expansion valve and an orifice tube?

A compressor’s expansion valve is an active device that controls the flow of refrigerant to the evaporator depending on the temperature of the evaporator. An orifice tube is just a fixed nozzle that squirts refrigerant into the evaporator without any feedback.

What does an orifice tube meter?

The orifice meter is a gas and fluid flow rate measuring tool. It consists of an orifice plate, housing, and tube.

What is orifice size?

Nozzle size is essential to pressure regulation in your machine. A small orifice equals more restriction of water, which ultimately means less flow and the potential for an excessive load on the motor.

When should you change the orifice tube?

When another crucial portion of the circuit is changed, the orifice tube must always be replaced (compressor, condenser, evaporator, accumulator). Valeo advice: Before putting in a new orifice tube, flush the A/C loop.

How the AC Orifice Tube Works by Howstuffinmycarworks

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Conclusion:

An orifice tube is a device used in automotive air conditioning systems to meter the amount of refrigerant flowing into the system. The orifice tube is inserted into the high-pressure side of the AC system and measures the pressure drop across it. Based on this measurement, the controller determines how much refrigerant needs to be injected into the low-pressure side of the system to maintain optimal cooling performance. If you’re experiencing problems with your car’s AC system, it may be time for a new orifice tube. Have you ever replaced your orifice tube? Let us know in the comments below!

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