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| Number | Title | Issue Date |
| 4776365 | Non-turbulent shut-off valve A non-turbulent fluid shut-off valve with a shrouded movable valve member outside the flow stream when in its open position.... | 10/11/1988 |
| 4736766 | Flow shut-off valve A fluid shut-off valve and a strainer assembly mounted in the same body with the strainer easily removable when the valve is in its closed position.... | 04/12/1988 |
| 4645179 | Gate valve seal system This invention relates to an improved gate valve having floating seal elements which are back-relieving and reversible for long-term permanent sealing under varied pressure conditions. The sealing elements are mounted in unrestrained relation in juxtapose... | 02/24/1987 |
| 4432387 | Rotating disc gate valve A rotating disc gate valve for controlling fluid flow in a flow line comprising a valve body having a flow passageway and a cavity transverse to the flow passageway to receive a flow control assembly. The flow control assembly includes first and second va... | 02/21/1984 |
| 4376448 | Let-down valve The valve passes incoming pressurized fluid through a pair of orifices arranged in opposite side walls of a hollow tubular plug to form two fluid jets which impinge upon one another in the plug interior prior to exiting. The orifices are elongated and sel... | 03/15/1983 |
| 4304254 | Dust trap valve with removeable double-life door and valve seat member A dust valve for the discharge line of a dust collection system includes a removable closet with two wear surfaces and a coacting removable valve door with two wear surfaces mounted within the valve body. Once the coacting wear surfaces on the closet and ... | 12/08/1981 |
| 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 |
| 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 |
