What does A/V mean on an inner tube package? I've got a bike tire that says "(32-630) 27 X 1 1/4" on it.

I've got also got an innertube that says "700X18/23C -27X1 A/V".  

I'm trying to figure out if the innertube is the right size for the tire.  I gather that my tire has a 27" diameter and a 1 1/4" width.  It seems that the innertube is designed for a tire that's 27" by 1"... which seems like it's not the right size.  But is that correct?  Or will the innertube fit?  And in either case, what does A/V mean in this context?

Many thanks,

D
Schrader valve/Schrader tube
aka &quot;American valve&quot; or &quot;Automotive valve&quot;

The Schrader valve consists of a valve stem into which a valve core is threaded, and is used on virtually all automobile tires and most wider rimmed bicycle tires. The valve core is a poppet valve assisted by a spring.