Spring loaded plug valve
US4237920A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1979 |
| Grant date | Dec 9, 1980 |
| Priority date | — |
| Expiry date | Jan 29, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/4301
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A valve is provided which includes a poppet enclosed in a plug of plastic material, such as Teflon, and which is biased against a seat by a compression spring so that a positive seal is provided even in the presence of cold flow in the plastic plug. A valve stem engages the poppet, and it serves to pull the poppet and plug away from the seat against the force of the spring when the valve is opened, and to force the poppet and plug against the seat when the valve is closed. The valve is closed by a pressurized fluid, such as air, and is opened by means of a spring when the air pressure is removed. The Teflon plug is provided with a sharp corner which contacts a conical seat creating a seal when the valve is closed. The sharp corner of the plug wipes the seat of the debris as the valve is opened and closed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.