The Importance of Draining Water from Compressed Air Tanks

Video why should you drain water from compressed air tanks

When operating rotary screw or reciprocating air compressors, it’s crucial to be mindful of the water vapor that is released during the process. This water vapor condenses into a liquid and accumulates at the bottom of the air tank. Failing to drain this water can lead to significant damage to the compressor, resulting in costly repairs or even replacement. In this article, we will explore why draining water from compressed air tanks is essential and how drain valves can help in this process. We will also discuss the different types of drain valves and provide guidance on how to replace them.

Understanding the Drain Valve

The drain valve is a small device typically located at the bottom of an air compressor’s receiver. It opens and closes to facilitate the removal of water from the tank. Additionally, the drain valve assists in draining other components of the compressor, such as filters, air dryers, drip legs, and air or water separators, which may also accumulate moisture.

The Purpose of an Air Compressor Water Drain Valve

When air is compressed, its ability to hold water vapor decreases significantly. This compression process causes water molecules to clump together, resulting in condensation similar to how rain forms in the atmosphere. Drain valves allow excess water vapor to exit the tank and prevent condensation buildup. The accumulation of condensation can lead to corrosion, which can damage the compressor and shorten its lifespan. By removing the excess moisture, you can reduce wear on equipment powered by compressed air systems.

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Different Types of Drain Valves

There are various types of drain valves available, each catering to specific system components. Some common types include:

  • Float-operated: This type of valve allows water to flow into a special housing. When the water level reaches a predetermined point, a float triggers the opening of the drain, allowing the excess water to drain out.
  • Timer-controlled: These valves open and close at pre-set intervals, making them ideal for highly regulated operating environments.
  • Zero-loss: This type of drain valve contains a sensor probe that monitors water accumulation in the tank. Once the water reaches a specified level, the probe sends an electrical signal to a solenoid, causing the drain to open. However, the flow of water stops before any compressed air is released.

How to Use a Drain Valve

The drain valves mentioned above operate automatically, requiring little to no manual intervention. The main challenge lies in choosing a model that is compatible with your equipment and meets your operating requirements. Consider factors such as the availability of an electrical source, operating schedule, and the importance of minimizing compressed air loss during draining.

Steps for Replacing a Drain Valve on an Air Compressor

In the event that your drain valve shows signs of wear, it is important to replace it promptly to ensure proper air compressor function. A leaking drain valve can lead to severe problems in the operation of the compressor. Excessive condensation, rust, or corrosion can prevent the valve from sealing completely, resulting in a loss of pressure. Replacing the valve will help maintain optimal performance and extend its lifespan.

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To replace a drain valve, you will need the following tools:

  • A new valve
  • A hand wrench or socket
  • A brush or cloth to clean the valve threads
  • Safety glasses

The replacement process involves depressurizing the tank, removing the old valve, cleaning the threads, and installing the new valve securely.

Trust Quincy Compressor for All Your Drain Valve Needs

At Quincy Compressor, we understand the critical role that drain valves play in ensuring the performance of your air compressor. With our expertise as a leading compressed air equipment innovator since 1920, we are well-equipped to assist you with any drain valve questions or replacement projects. Contact us today to learn more about our high-quality products and maintenance services.

For more information about drain valves, visit 5 WS

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