Valve seat structure
US4320890A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1981 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Feb 20, 2001 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/186
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve seat structure for an expanding type gate valve (20). A valve seat (64) is received in each annular seat recess (62) formed around the upstream and downstream flow passages (24, 26) and opening to the valve chamber (22) wherein a gate assembly (32) is movable between open and closed positions. An annular face seal (82) is mounted within an annular groove (70) in the front seat face (66) of each valve seat (64). A substantial portion of the bottom (76) of the annular groove (70) comprises a frusto-conical bottom portion (80) which forms a wedging surface with a cone angle in the range of approximately 30.degree. to 60.degree. and disposed substantially coaxial with the groove sides and the flow passages. The rear seal face (86) of the face seal (82) has a frusto-conical rear portion (94) that conforms to the frusto-conical bottom portion (80). The annular groove (70) is wider than the thickness of the face seal (82 ) so that the face seal loosely fits within the annular groove. The front seal face (84) extends beyond the front seat face (66) a distance in the range between approximately 0.0051 cm and 0.0381 cm when loosely seated in the annular groove. When the gate assembly…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.