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| Number | Title | Issue Date |
| 7004445 | Mechanical override for a valve actuator An apparatus and method for manual operation of an actuator is disclosed. A mechanical override includes a housing coupled to the actuator, a drive ring, and a shaft extending through a bore of the housing. The drive ring rotationally keys to the bore such that the ... | 02/28/2006 |
| 6401747 | Gate valve The present invention is directed to a gate valve which in one embodiment comprises a valve body having an internal flow passage which extends between an inlet port and an outlet port; a pair of seats mounted in respective seat pockets formed in the body ... | 06/11/2002 |
| 4909272 | Gate valve An improved gate valve is described. The valve utilizes a flat gate having a beveled edge which slices across a central passage in the valve housing when the valve closes. A manifold is disposed in the passage to direct a purge stream of fluid across the ... | 03/20/1990 |
| 4393928 | Apparatus for use in rejuvenating oil wells A sub incorporating a check valve is connected into the lower end of a well pipestring. This valve will pass hot steam injected down the pipestring to the formations to loosen up the thick crude oil. The check valve prevents back flow and thus will hold t... | 07/19/1983 |
| 4355784 | Method and apparatus for controlling back pressure A back pressure control choke operates to automatically control and maintain a desired back pressure on the fluid passing through the choke. The choke housing has an inlet channel which intersects with an axial bore, part of which bore constitutes the dis... | 10/26/1982 |
| 4257442 | Choke for controlling the flow of drilling mud This apparatus disclosed in its preferred form is a choke for controlling the flow of drilling mud which is highly abrasive. The abrasive drilling mud is introduced through a lateral port and an elongate, tubular body. In the tubular body, a fluid actuate... | 03/24/1981 |
| 4243067 | Ball type check valve A check valve which has top and bottom flanges and a valve body thereinbetween. The flanges have aligned holes therethrough which serve as an inlet (bottom flange) and an outlet (top flange) for fluid flowing through the valve. A spherical ball is contain... | 01/06/1981 |
| 4190073 | Choke for controlling the flow of drilling mud This apparatus disclosed in its preferred form is a choke for controlling the flow of drilling mud which is highly abrasive. The abrasive drilling mud is introduced through a lateral port and an elongate tubular body. In the tubular body, a fluid actuated... | 02/26/1980 |
