What Is an Air Compressor Check Valve and How Does It Work?

Air compressors provide force for pneumatic tools and also power some types of industrial machinery. Without a properly functioning air compressor check valve, tools and equipment may not work as efficiently as they should. So, what is an air compressor check valve, and how does it work?

What Is an Air Compressor Check Valve?

The air compressor check valve is a small yet crucial component that plays a pivotal role in the functioning of an air compressor. Usually located in the tank’s inlet, the check valve’s primary function is to allow airflow in only one direction. This means that it lets the compressed air enter the tank while preventing the backflow of air and maintaining tank pressure.

Why Do Air Compressors Have Check Valves?

Air compressors have check valves because they maintain tank pressure, ensuring that pneumatic tools receive the necessary force to function effectively. Check valves also prevent the backflow of air, which could cause damage to the compressor pump or other components. Finally, check valves provide a safety barrier by eliminating potential hazards due to pressure buildup in the system.

The Perils of a Failing Check Valve

If an air compressor check valve fails, it can create several problems, including:

• Loss of air pressure: A failed check valve allows compressed air to leak back through the pump, making it difficult to maintain tank pressure. This impacts the efficiency of pneumatic tools.
• Excess strain on the motor: With a failing check valve, the motor needs to work harder to maintain tank pressure. This increased workload wastes energy and accelerates wear and tear.
• Difficulty in starting the compressor: A check valve failure may cause pressure to build in the pump head, making it challenging to start the motor.

Addressing a Faulty Check Valve: Maintenance and Replacement

Regular air compressor check valve maintenance is necessary to prevent failure and extend its life span. However, if the valve still fails, you must replace it. To avoid expensive repairs and ensure your air compressor is working properly, inspect the check valve regularly: Periodic inspection allows you to identify any debris or dust accumulated in the valve, which can cause blockages and malfunction.

You should also clean the check valve on a regular schedule according to the compressor manufacturer’s recommendation. Remove any dirt or debris present in the valve with a wire brush and the recommended cleaning solution.

The most common symptom of a faulty check valve is air leaking from the pump head or through the pressure switch bleeder valve after the unit shuts off. One will typically hear a constant air leak from the small bleeder valve attached to the pressure switch, which is attached to the check valve (or pump head) via a 1/4" air line.

If you encounter persistent issues despite cleaning the valve, it may be time to replace it. Make sure you choose a compatible check valve for your air compressor and follow the manufacturer’s instructions during the replacement process.

Understanding what an air compressor check valve is and how it works is crucial for DIYers using pneumatic tools. It’s essential to give this key component the attention it requires—including regular inspection, cleaning, and timely replacement. By ensuring the proper functioning of your air compressor check valve, you can enhance your equipment’s performance and lifespan.