Gate valve structure
US4486003A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 6, 1984 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Jan 6, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/0236
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An expanding gate valve with a valve seat structure which comprises a pair of "floating" seat rings (60) loosely received in annular seat pockets (52) surrounding the flow passage through the valve and each having an axial dimension which exceeds the depth of the seat pocket. The front face (61) of each seat ring is disposed adjacent the gate assembly (24, 26) and is provided with an annular groove (63) and an annular resilient sealing element (64) therein adapted to form a ring of sealing contact area about the flow passage (14) when the gate assembly is expanded thereagainst. The rear face (66) of the seat ring (60) is provided with an annular groove (63') and a second annular resilient sealing element (64'). The two annular sealing elements are coaxial and the inner diameter of the front sealing element (64) exceeds that of the rear sealing element (64') so that the front sealing element is a greater radial distance from the flow passage (14) than is the rear sealing element. When the gate assembly is expanded against the seat rings (60), the annular area of the front of the seat ring exposed to flowline pressure exceeds the annular area of the rear of the seat ring exposed to f…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.