Dripless valve
US4516702A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Dec 6, 1982 |
| Grant date | May 14, 1985 |
| Priority date | — |
| Expiry date | Dec 6, 2002 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05C5/0225
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A valve for applying a flowable material in which it is desired to provide a sharp cutoff in application of the material includes a valve body with a chamber therein in communication with a source of the material to be applied. A movable piston is positioned within the valve body and there is a passage in the piston opening to the chamber with the passage terminating in an application opening. A movable valve stem is positioned to open and close upon the passage chamber opening to control the flow of material to the passage and application opening. A negative pressure is created at the application opening at or immediately after closure of the valve stem upon the passage chamber opening to thereby provide a sharp cutoff in the application of the material from the opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.