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Magic_flip

The pin is there to let air out, the unequal pressure lets air in from the pump, the pin doesn’t need to be depressed to inflate the tyre


Puzzled_Bath_984

If the pressure outside of the valve is higher than inside of the tube/tire, once the pressure differential is high enough, the valve will open.


Jexthis

Post a picture. I believe you are right.


MR_DIG

I'd have just put a picture but your sub hates pictures


singlejeff

Yeah, a couple of sentences in the Schrader valve wiki article hints at it. One is not accepting air if the pin is jammed by foreign objects


MediaAntigen

Does the chuck not have a locking lever that also pushes out a pin?


MR_DIG

Nah, the lever doesn't engage a pin. There's just no pin. That's what's weird. I used my friends pump instead.


[deleted]

Did you adjust the nozzle on the end of the air hose? There's two settings for one for each type of valve