How-To Blogs & Videos
What’s That Hiss? Demystifying the Unloader Valve’s Role
If you own an air compressor, you’ve heard it: that sharp psshhh sound the moment the motor shuts off. To the untrained ear, it sounds like a problematic leak. To a pro, it’s the sound of a healthy machine.
That sound is created by the unloader (or bleeder) valve. While it’s one of the smaller components on your compressor, it plays a massive role in ensuring your machine actually starts up the next time you need it.
What is an Unloader Valve?
The unloader valve’s primary
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Feb 3, 2026