Butterfly valve seat
US4623121A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 7, 1985 |
| Grant date | Nov 18, 1986 |
| Priority date | — |
| Expiry date | Aug 7, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K1/2266
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An annular valve seat is fitted in a rotary fluid control valve of the butterfly type. The seat consists of a radially outer tail portion, a radilly intermediate metal support portion in the shape of an S and a radially inner metal seal portion having a metal sealing surface in the form of an annular semi-torus. The seal portion includes structure for retaining an elastomeric sealing insert. The valve seat is inserted in a groove between the valve body and an insert, with a small space existing between the axial sides of the groove and the axial sides of the S-shaped intermediate portion. The intermediate portion accordingly permits limited flexure in response to pressure stresses on the valve seat, but the flexure is limited by contact with the walls of the groove. The metal and elastomeric sealing surfaces provide leak-free sealing with an extending life.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.