Vertical metering pump having piston biasing elastomeric gasket
US5518377A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 10, 1995 |
| Grant date | May 21, 1996 |
| Priority date | — |
| Expiry date | Aug 10, 2015 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB05B11/1077
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A miniature metering pump of the type possessing a body provided with an inlet opening out into a metering chamber, associated with an inlet valve having a valve member, and with a piston having a plunger provided with an axial nozzle and flared at its bottom end to form a hood receiving a sealing gasket, its internal channel being associated with an outlet valve having a valve member, wherein said outlet valve member forms a portion of a single elastically deformable part that constitutes said gasket, shaped to have a bottom U-shaped ring assembled round the hood of the plunger, and connected at the top on the outside to a substantially cylindrical skirt for sealing and for returning the piston to its rest position, which skirt runs on from an annular flange for providing sealed connection with the body; and on the inside by a folded valve member that is generally conical or mitral-valve shaped, with a narrow top end carrying a cutout surrounded by a lip that opens to provide an outlet orifice.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.