Beer pump workings

Hi,

I've been asked to do an assignment about the workings of a beer pump. I've researched the history of the beer engine, but I think the question was more to do with the workings of a modern lager/bitter type pump. I've tried to see if there are any explanations on the web, but drawn a blank so far. Does anyone know of any websites that offer a simple explanation?

The assignment was half jokingly set, but I would like to do answer reasonably.

Thanks!

Reply to
David
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