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| All Patents in class 251/318 | |||||
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| Number | Date | Patentee | Title | Type | |
| 54,153 | Apr. 24, 1866 | J.L. Hewes | Improvement in cut-off valves | steam engine valve gear | |
| 933,698 | Sep. 07, 1909 | G.L. Crook | Valve | internal combustion engine valves | |
| 1,111,391 | Sep. 22, 1914 | S.L. Kneass | Valve | gas and liquid valves | |
| 2,090,232 | Aug. 17, 1937 | F. Ritz | Injection Nozzle | diesel engines | |