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| Number | Title | Issue Date |
| 5934647 | Metal seal for valve A metal seal for valves, especially disk valves, for use in pipelines through which fluid media flow. The seal ring has at least one, relatively flexible metal or metal composite seal ring which can be mounted to either the housing or the disk of the valv... | 08/10/1999 |
| 5692725 | Valve seal A butterfly valve has a disc which is pivotally mounted inside the passage through the housing and movable between open and closed positions. In its closed position, a seal is established between the valve housing and the disc with a seal ring that has a ... | 12/02/1997 |
| 5377954 | Valve with seal ring having edge-welded laminations Disclosed is a disc valve with a laminated seal ring secured to the housing which forms a leakproof seal with a seating surface on the valve disc. The seal ring is made of two or more metal laminates, the outer peripheral edges of which are cold welded to... | 01/03/1995 |
| 5357997 | Valve with segmented retainer ring A disc valve with a disc that is pivotable between open and closed positions has a metallic seal ring placed against an axially-oriented face formed by the housing and located at the ends of an enlarged conduit portion between the face and one of the ends... | 10/25/1994 |
| 5275374 | Disc valve with protected open disc A shield for the sealing surface of a pivotable disc of a disc valve faces in an upstream direction to protect the sealing surface against wear and tear from a fluid medium streaming through the valve, particularly a hot fluid medium with abrasive particl... | 01/04/1994 |
