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| All Patents in class 251/50 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,087,906 | Feb. 17, 1914 | C.R. Houghton | Relief-valve | pressure regulators | |
| 1,795,310 | Mar. 10, 1931 | W.E. Mathews | Compressor Unloader | air compressors | |
| 2,108,979 | Feb. 22, 1938 | D.D. Wile | Valve | flow controls | |
| 2,843,148 | Jul. 15, 1958 | A.W. Rymills | Soft closing nozzle valve | locomotive diesel fuel apparatus | |
| 2,903,234 | Sep. 08, 1959 | H. Steinhauer, V.v. Sundt | Timed Valve with Cam Actuator | metalworking machine mechanisms | |