Ball valve having a magnetic seat sealing device
US6672563B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 21, 2001 |
| Grant date | Jan 6, 2004 |
| Priority date | — |
| Expiry date | Jul 4, 2022 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K31/08
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A ball valve having a magnetic seat sealing device comprises a valve body, a valve seat, a valve ball, a valve stem and a valve bonnet, wherein the valve seat is disposed within a valve body cavity of the valve body, the valve ball being rotatably disposed on the valve seat, the valve bonnet engaging the valve body to confine the valve body cavity, the valve stem passing through the valve bonnet and drivingly engaging the valve ball; and being characterized by comprising a magnetic seat sealing device that employs a magnetic mechanism to control the metal valve seat, so that when the ball valve is in a closed condition, the magnetic mechanism exerts a magnetic force to the metal valve seat to further tighten and seal the valve seat against the valve ball; and when the ball valve is in an open condition, the magnetic force is released to allow the metal valve seat to return its original position; whereby the metal ball valve can be operated by a low operative torque and maintaining superior sealing effect.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.