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check valves on air pumps?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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check valves on air pumps?

Unread postAuthor: urgle the danish cow » Sun Nov 13, 2011 11:58 am

i discovered that my local store carries many check valves and i am inspired to make an air pump for the ones i buy always break.
i understand the way the pump plunger works but how does the check valve open under higher pressures? does the plunger have to poke it open or does it have to get extremely close?
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Unread postAuthor: Gun Freak » Sun Nov 13, 2011 12:42 pm

The air pressure generated on the stroke opens it; once the pressure equalizes, the spring closes it.
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