how check valve works
Air compressor Check Valves are actually pretty simple parts. Although they can take many shapes and forms, the principle is mostly the same.
Inside the air compressor check valve, you will find a disc or ball (ball mostly on smaller check-valves) and spring that pushes down on the disc or ball.
When air flow in the 'allowed direction', it pushes against the disc or ball. Since the spring is not very strong, the compressed air will move the disc or ball open. Result: the air can flow through the check valve.
Now, when the air tries to flow from the opposite direction, it pushes against the disc or ball from the same side as the spring does. The spring and the compressed air work together! They push the disc/ball into its seating and no air can pass by it.
In fact, the higher the pressure, the harder it pushes the disc or ball into its seating, and the less likely it is that there will be any air leakage.
Sometimes air compressor Check Valves leak air at lower pressure and stop leaking air at higher pressure. While this may seem strange, it is easily understood when you know the inner workings of theCheck Valve!
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