How to Replace the Drain Valve on an Air Compressor

If leaking seals and service bills are distressing your compressor, it's time to face the fix. While air compressors can be as diverse as the individuals that use them, most models share some general characteristics and components. Whether you are inflating your tires or creating empires, eReplacementParts.com provides the parts, procedures and facts you need to fearlessly fix what fails you.

With normal use, condensation can accumulate inside the compressor tank. The drain valve allows you to discharge excessive moisture and depressurize the air tank for servicing. Over time, rust and corrosion may prevent the drain valve from sealing properly and the tank will not hold pressure. Conversely, a drain valve that does not open at all can allow excessive moisture and rust to accumulate within the tank.

Less than impressed with your compressor? Replacing the drain valve could be the solution. This article will show you how to complete the repair in minutes.   THE FACTS | THE FIX | THE FINISH REMOVING THE DRAIN VALVE  [top] !  Depressurize the air tank.

Always depressurize the air tank before servicing your air compressor. To do this, open the drain valve and wait until all of the air (and pressure) has escaped. If you are unable to open the drain valve (due to rust or corrosion), discharge as much air as possible using an air chuck or blower nozzle.

  1. Remove the drain valve.

Tilt the compressor onto its side to expose the drain valve.

Use a wrench to loosen the drain valve.

Remove the drain valve from the tank.

      INSTALLING THE NEW DRAIN VALVE  [top] 2. Install the new drain valve.

Thread the drain valve into the tank. (The new drain valve comes with thread sealant pre-applied; additional thread sealant is not required.)

Use a wrench to secure the drain valve.

  THE FACTS | THE FIX | THE FINISH

A well-maintained air compressor can mean the difference between performance under pressure, and under-pressured performance. But you don't have to empty your pockets to empty your air tank. As you just learned, replacing the drain valve is a repair you can complete quickly and economically. Not only did you refresh compression at a fraction of the cost of replacement; you have inflated your ability to fearlessly face the next fix, regardless of the pressure involved. Find your next fix here.   [top]