Century Dictionary and Cyclopedia
- n. A balancing-ring; a metal ring placed on the back of a slide-valve, or in the casing of a steam-chest, to keep the steam-pressure from acting over an area on the back of the valve equal to the area of the exhaust-port. This so relieves the valve of pressure that it is practically balanced. The ring is usually placed in a recess and kept tight by placing springs behind it.
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