|
| US4188973 | 6. Dez. 1977 | 19. Febr. 1980 | Anderson, Greenwood & Co. | Check valve |
| US4270569 | 16. Okt. 1978 | 2. Juni 1981 | Christensen Inc. | Valve assembly for the remote control of fluid flow having an automatic time delay |
| US4321945 | 17. Apr. 1980 | 30. März 1982 | Electricite de France (Service National) | Damped fluid pressure relief valve |
| US6209561 | 28. Febr. 2000 | 3. Apr. 2001 | SPM Flow Control, Inc. | Emergency pressure relief valve |
| US6978799 | 22. Okt. 2003 | 27. Dez. 2005 | S.P.M. Flow Control, Inc. | Emergency pressure relief valve with enhanced reset |
