Device for dispensing liquid having an improved seal assembly
US7182229B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 2004 |
| Grant date | Feb 27, 2007 |
| Priority date | — |
| Expiry date | Oct 13, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B7/0815
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A device for dispensing a liquid includes a dispenser body having a liquid passage and an air passage. A valve stem is mounted in the dispenser body and reciprocates between an open position allowing liquid flow and a closed position preventing liquid flow. A pre-assembled unitary seal assembly is threadably engaged with the dispenser body and includes a housing having a bore therethrough. The housing includes a first and second seal members positioned within the bore that each form a dynamic seal with the valve stem to prevent air and liquid from leaking out of the air and liquid passages. The housing further includes a static seal between the outside of the housing and the dispenser body. The valve stem may be moved to an open position by pressurized air acting on a piston and moved to the closed position by a spring-return mechanism to selectively dispense the liquid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.