![]() ![]() ![]() When you’re done, simply pull the air fitting off the Schrader valve. Note the threaded valve body that allows it to screw into the valve stem. ![]() On the right is the poppet valve that feeds into your tire or inner tube. On the lefthand side is the plunger that’s visible inside the valve stem. Assuming your compressed air source is greater than the pressure in the tire (typically north of 30+ PSI), the air pressure differential will force air from your air compressor tank, through the Schrader valve, and into the tire. When you insert your air hose fitting into the valve stem to inflate the tire, the fitting uses a tiny pin to press on that plunger to open the poppet valve. (Image/OnAllCylinders) How a Schrader Valve WorksĪ Schrader valve is a poppet valve that’s actuated by a plunger on top of the valve body. See that little guy next to the valve stem? That’s the Schrader valve. But for this article, we’re focusing solely on a Schrader valve’s use on a car or truck tire. Outside of vehicle tires, you’ll find Schrader valves in fuel line plumbing, HVAC systems, and other applications where you need to contain and regulate high pressure fluid. These have a smaller diameter and are better suited to a narrow bicycle tire-you probably won’t see Presta or Dunlop valves in a full size vehicle application. There are two other types of tire inflation valves you may come across too, Presta and Dunlop, specifically when working on bicycle inner tubes. They’re standard on cars, trucks, motorcycles, tractors, and pretty much any vehicle equipped with inflatable rubber tires. You’ll see Schrader valves on tubeless tires-radial and bias ply-along with inner tubes. * The Schrader valve is named after the guy who invented it, but you may sometimes hear it called an “American valve” in some import circles. When properly inflating car or truck tires, even the most diehard gearhead won’t give much thought to the tiny little device working its magic in the valve stem-it’s called a Schrader valve* and it’s been doing its thing for well over a century now. ![]()
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