Plunger or floating piston pump
US4572056A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 8, 1984 |
| Grant date | Feb 25, 1986 |
| Priority date | — |
| Expiry date | Nov 8, 2004 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/162
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The present invention relates to a plunger or floating piston pump which is particularly adapted for use as a small-size metering pump in performing chemical analyses. In a pump head casing there is disposed a plunger guide bushing made of a ceramic material in which a plunger made of sapphire is slidably guided permanently with extreme accuracy in relation to the bore in an annular seal, said annular seal itself cooperating with said plunger in such a way that there is no clearance between the plunger and said plunger guide bushing. In a modification of the invention, said displacement chamber is formed in a pump head liner which is mounted in said pump head casing. The pump head liner is made of a chemically inert material, preferably of a ceramic material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.