West`s Double beat Valve-what did it look like?

Time to delve into some engineering-with a few images that did not reach the pages of The Last Great Engineer. Images that I hope will add to the descriptions within the book. This picture refers to Patent No 8103, reproduced on page 55 of the book.
   

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West and Harvey`s double beat valve

West and Harvey’s valve for raising water and other liquids-Patent No 8103

This valve is a self acting double beat valve. Beats are what Cornish engines called the valve seats. It was a relatively simple design, and one that quickly became adopted by waterworks all over Britain. I have shown this drawing to my engineering colleagues who have stated that it is now called a balanced valve.

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