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| All Patents in class 251/187 | |||||
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| Picture | Number | Date | Patentee | Title | |
| 8,303X | Jul. 10, 1834 | J. Kirkpatrick | Self-balance steam valves | ||
| 15,400 | Jul. 22, 1856 | H.R. Worthington | Relieving steam slide-valves from pressure | ||
 | 27,381 | Mar. 06, 1860 | J.T. Plass | Slide-valve for steam-engines | |
 | 181,334 | Aug. 22, 1876 | L.H. Hall | Improvement in balanced valves | |
| RE9,303 | Jul. 20, 1880 | J.F. Allen | Balanced valve | ||
| 382,674 | May 08, 1888 | D.A. Woodbury | Adjusting Relief-Plate Wedges of Slide Valves | ||
| 396,737 | Jan. 29, 1889 | C.M. Farrar | Balanced Valve | ||