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| Number | Title | Issue Date |
| 7204474 | High-pressure plug valve A plug valve has a valve body, a cage fitted within the valve body and a rotatable plug housed within a cylindrical cavity in the cage, for controlling fluid flow through the valve. The cage has first and second opposed flat side surfaces, each side surface has a po... | 04/17/2007 |
| 5464035 | Gate-type, side-ported, line blind valve A walled body, has apertures formed in front and rear walls thereof in which resilient seats are set. The latter sealingly engage a plate-type gate, centrally apertured for alignment with the seats, to define a portway through which to convey pipeline med... | 11/07/1995 |
| 5247960 | Replacement valve seat device with expandable ring A replacement valve seat device for insertion in a recess of a valve where a valve seat has been removed includes a first ring which provides a valve seat and a cooperating second ring of memory metal which is expandable upon being heated above its transi... | 09/28/1993 |
| 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 |
| 4765361 | Ported gate valve A gate valve formed with spaced parallel housing plates having axially aligned apertures which constitute a housing therebetween. Elastomeric sleeves line the apertures of the housing plates to provide an annular space between the sleeves. An elongated ga... | 08/23/1988 |
| 4744386 | Modular hydraulic actuator A surface safety valve hydraulic actuator of modular construction. The actuator includes separately installable, removable, and interchangeable wirecutting and non-wirecutting spring modules, used with the same hydraulic cylinder and bonnet. The bonnet is... | 05/17/1988 |
| 4541453 | High temperature slide valve A slide valve for use in a high temperature gas line is described. The valve is constructed to allow field assembly and disassembly for ease of service, and has insulating means and gas purge means for maintaining the exterior of the valve housing at a lo... | 09/17/1985 |
| 4474205 | Sliding blade apparatus for closing conduits A conduit closure apparatus comprising a main frame adapted for connection to a conduit in a position generally in registry with the conduit, a movable blade slidably mounted in the frame, means for moving the blade back and forth between an open position... | 10/02/1984 |
| 4378817 | Slide valve assembly A slide valve for high temperature, high pressure use provides for easy access to internal components for replacement or repair, and also provides for easy and secure adjustment of the valve components from the exterior of the valve even while the valve i... | 04/05/1983 |
| 4316483 | Valve having wear-prone parts removable through bonnet area A valve is disclosed in which the wear-prone parts comprised of the valve, guides and valve seat are readily and easily removed through the bonnet area. The guides are maintained in position in the valve body by engagement with a stop and by securing the ... | 02/23/1982 |
| 4307747 | Dust trap with removable valve seat A dust trap for bag houses and the like which is provided with an internal removable valve seat to facilitate replacement of the valve seat or regrinding of the valve surface. The valve seat and dust trap have complimentary supporting parts to support the... | 12/29/1981 |
