If you own an air compressor, you know how important it is to maintain it properly. One of the most critical components of an air compressor is the pressure switch. It controls the operation of the compressor by turning it on and off at specific pressure levels. Understanding the parts of an air compressor pressure switch can help you troubleshoot and repair it in case of a problem. In this article, we will take a closer look at the parts of an air compressor pressure switch and how they function.
The Basic Parts of an Air Compressor Pressure Switch
An air compressor pressure switch consists of several parts that work together to regulate the pressure in the compressor. Here are the basic parts:
1. Pressure Sensing Element
The pressure sensing element is the part of the switch that measures the pressure in the compressor. It is usually a diaphragm or a bellows that expands or contracts depending on the pressure in the system. When the pressure reaches a certain threshold, the sensing element triggers the switch to turn on or off.
2. Electrical Contacts
The electrical contacts are the part of the switch that turns the compressor on and off. They are usually made of metal and come into contact with each other when the switch is triggered. When the contacts are closed, electricity flows to the motor, which turns the compressor on. When the contacts are open, the electricity stops flowing, and the compressor turns off.
3. Adjustment Screws
The adjustment screws are used to set the pressure levels at which the switch turns on and off. They are usually located on the top or side of the switch and can be adjusted using a screwdriver. Turning the screws clockwise increases the pressure levels, while turning them counterclockwise decreases them.
How an Air Compressor Pressure Switch Works
Now that we know the basic parts of an air compressor pressure switch let's take a closer look at how they work together to regulate the pressure in the system. Here is a step-by-step guide:
Step 1: The Compressor Turns On
When the pressure in the compressor drops below the set point, the pressure sensing element contracts, and the electrical contacts close. This allows electricity to flow to the motor, which turns the compressor on. The compressor starts to pump air into the tank, and the pressure starts to rise.
Step 2: The Compressor Reaches the Cut-Out Pressure
As the pressure in the compressor rises, the pressure sensing element expands, and the electrical contacts open. This stops the flow of electricity to the motor, and the compressor turns off. The pressure in the system is now at the cut-out pressure, which is the maximum pressure that the switch is set to allow.
Step 3: The Compressor Turns On Again
As air is used from the tank, the pressure drops below the cut-out pressure. The pressure sensing element contracts again, and the electrical contacts close, allowing electricity to flow to the motor. The compressor turns on, and the cycle starts again.
Troubleshooting an Air Compressor Pressure Switch
If your air compressor is not working correctly, the pressure switch could be the problem. Here are some common issues with pressure switches and how to troubleshoot them:
1. The Compressor Will Not Turn On
If the compressor will not turn on, check the electrical contacts for damage or wear. If they are dirty or corroded, clean them with a wire brush. If they are damaged, replace the pressure switch. Also, check the power supply to the switch to ensure that it is supplying electricity.
2. The Compressor Runs Continuously
If the compressor runs continuously, check the pressure sensing element for damage or wear. If it is damaged, replace the switch. Also, check the adjustment screws to ensure that they are set correctly. If they are set too high, the compressor will run continuously.
Conclusion
An air compressor pressure switch is a critical component of your air compressor. Understanding the parts of the switch and how they function can help you troubleshoot and repair it in case of a problem. Remember to maintain your air compressor regularly to ensure that it operates correctly and lasts for a long time.
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