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| All Patents in class 251/284 | |||||
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| Number | Date | Patentee | Title | Type | |
| 383,226 | May 22, 1888 | A.G. Hohenstein | Automatic pressure-regulator and safety-valve | steam valves | |
| 1,299,452 | Apr. 08, 1919 | R.W. Foster | Blow Off Valve | blow off valves | |
| 2,634,086 | Apr. 07, 1953 | W.E. Johns | Valve with self-contained stem centering device | ||