Balanced Slide Valve
The balanced slide valve was invented by the Scottish engineer Alexander Allan. It was not much used in the UK but, at one time, had great popularity in the USA. It gave some of the advantages of a piston valve to a slide valve by relieving the pressure on the back of the valve, thus reducing friction and wear.
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Famous quotes containing the words balanced and/or slide:
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—Thomas Aquinas (c. 1225–1274)
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