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| All Patents in class 251/366 | |||||
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| Number | Date | Patentee | Title | Type | |
| 15,030 | Jun. 03, 1856 | H.R. Worthington | Method of attaching stems to conical valves | water valves | |
| 545,414 | Aug. 27, 1895 | J.W. Sargent | Exhaust Valve for Steam Engines | steam engine valves | |
| 4,460,157 | Jul. 17, 1984 | F.V. Marchal | High Pressure Ball Valve | steam engine valves | |