Replaceable valve shaft sealing system
US7971854B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 23, 2008 |
| Grant date | Jul 5, 2011 |
| Priority date | — |
| Expiry date | Mar 10, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K43/00
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A replaceable valve shaft sealing system is disclosed that enables the operator to greatly reduce the maintenance needs of valves where rotational movement of a shaft, that is connected to the actual metering apparatus of the valve, actuates the opening or closing of the valve thereby regulating fluid flow. The design of the shaft enables the user to replace the valve stem and associated sealing rings or to re-lubricate the shaft, while the valve is connected to the line, by simply removing the packing nut. There are no-preloaded sealing devices that require re-construction. Prior art designs use O-rings to prevent the seepage of fluid into the valve body and though the rotating shaft, but the disclosed shaft prevents contamination of the lubrication into the fluid flow and eliminates any of the axial loads that can cause O-rings to fail using the prior art designs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.