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| All Patents in class 251/309 | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 91,337 | Jun. 15, 1869 | W.H. Howland | Improvement in steam-engine stop-valves | |
| 215,806 | May 27, 1879 | G.H. Corliss | Exhaust Valve for Steam Engines | ||
 | 2,055,232 | Sep. 22, 1936 | R.C. Anderson, C.L. Hardy | Valve | |