Patent Model - Improvement in Safety-Valves

Maker and role
Dexter Chamberlain, Patentee
Production date
Dec 24 1872
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Object detail

20 x 17 x 2 1/4" (50.8 x 43.2 x 5.7cm)
"The nature of my invention relates to improvements on valves constructed in such a manner that the valve will rise gradually as the pressure on the valve increases; ...secondly, my invention relates to a suitable arrangement whereby the valve may be occasionally rotated around its axis, for the purpose of preventing the clogging up of the valve on its seat, occasioned by the deposition of salts, dirt or minerals thereon, which is of frequent occurrence on many of the river-steamers, as well as the ocean steam-boats, where such a feed-water is used for the boilers." (Patent Number 134,126)
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