Today in 1911, US Patent 1011147 A was issued, an invention of Samuel E Bennett, for his beer keg “Valve.” There’s no Abstract, although in the description it includes these claims:

This invention relates to valves and more particularly to an air valve of that character used in beer drawing apparatus, and the invention has for its primary object to provide a valve of this character consisting of an attaching body adapted for connection to the beer keg and to an air hose or pipe, and a valve carrying casing removably engaged in said body.

A further object of the invention is to provide improved means for mounting the valve member, whereby, in the event that foreign particles of matter should find their way between the valve member and its seat, said valve member and its case may be easily removed without liability of losing the valve member, and such foreign matter removed.

A further object of the invention is to provide an air valve of this character of extremely simple construction, and one which is highly efficient and durable in use.