| All Patents in class 137/494 |
Patents 1 -
10
of 11
      |
| Picture | Number | Date | Patentee | Title |
 | 113,517 | Apr. 11, 1871 | B. Holly | Safety Valve |
 | 1,087,906 | Feb. 17, 1914 | C.R. Houghton | Relief-valve |
| | 1,702,550 | Feb. 19, 1929 | F.E. Stevenson | Hydraulic Reducing Valve |
| | 1,806,301 | May 19, 1931 | J.L. Valley | Pressure controlled valve |
| | 2,027,706 | Jan. 14, 1936 | L.L. Schauer, J.H. McKewen | Counterbalance valve |
| | 2,143,229 | Jan. 10, 1939 | P.S. Russel | Control Device |
 | 2,218,930 | Oct. 22, 1940 | N. Cunningham | Automatic draft control |
| | 2,224,377 | Dec. 10, 1940 | G.H. Clark | Refrigerating Apparatus |
| | 2,432,859 | Dec. 16, 1947 | F.Y. Carter | Refrigerant Flow Controlling Means |
| | 2,520,386 | Aug. 29, 1950 | E.J. Dillman | Refrigeration Expansion Valve |
