Abstract
The paper contains details of the results of experiments made some time ago on the balancing of a particular form of double-beat throttle valve with the object of elucidating the troubles frequently encountered when using it for the speed control of steam engines. The experiments showed that although apparently in balance, as judged from the design, there was a force tending to close the moving valve of an unexpectedly large amount varying with the size of the valve, the inlet steam pressure, lift from the seating, and the outlet pressure.
The paper further gives the application of the results towards improvement in governing; a formula for obtaining an approximate figure of the out-of-balance force from given working conditions, and a design of valve giving almost perfect balance under all working conditions. Curves and tables in explanation are included.
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