Balanced valve


a valve designed so that pressure-induced forces from the fluid being controlled oppose one another so that resistance to opening and closing the valve is negligible.
Historical Examples

This engine has a balanced valve and automatic cut-off, and is fitted with a reversing-gear for use on the road.
A History of the Growth of the Steam-Engine Robert H. Thurston

The most obvious of these is what is called the balanced valve.
Farm Engines and How to Run Them James H. Stephenson

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