Gate valve with improved secondary body to bushing seals
US4741509A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 19, 1987 |
| Grant date | May 3, 1988 |
| Priority date | — |
| Expiry date | Feb 19, 2007 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K3/0236
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The gate valve includes a body having a valve member or gate chamber, passages communicating through the body into the chamber, a recess in the body surrounding the opening of each passage into the chamber, a bushing positioned in each of the recesses, a gate positioned within the chamber, means for moving the gate within the chamber between positions communicating flow between the passages and closing flow between the passages, inner and outer unidirectional seals positioned between the surface of each of the recesses facing the gate and the opposing surface of the bushing in the recess, each of the seals include a U-shaped lip sealing element and a U-shaped spring positioned within the lip sealing element and urging the legs of the element apart into sealing engagement between the bushing and the body, the inner seal, which is positioned closest to the passage has the open end of its sealing element facing the passage and the outer seal, which is farther from the passage than the inner seal, has the open end of its sealing facing away from the passage, each of the seals being positioned within a recess in one of the bushing and the body which has a depth less than the height of t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.