Solvent pumping system for chromatography with switching-valve
US5637208A · kind A · utility
Inventor
Key dates
| Filing date | Jun 24, 1994 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Jun 24, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86163
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A pumping system for continuously delivering fluid at a selected flow rate to a receiving system. The system includes at least a first and a second pumping unit, each of the individual units comprises a syringe and a valve. The syringe comprises a piston and a piston actuator, cylinder, and pressure sensor. The valve comprises a positively-actuated zero switching volume valve and valve actuator. The first and second pumping units are in fluid communication with one another and are capable of independent actuation. The individual valves are arranged to isolate either the first syringe or the second syringe, respectively, from the receiving system while at least one of the syringes remains in fluid communication with the receiving system whereby system pressure can be continuously monitored and the selected system flow rate maintained. A controller receives inputs from the first and second pressure sensors and activates in response to the inputs the first and second syringes individually, and also activates the first and second valves individually such that when fluid communication is established between the isolated syringe and the receiving system substantially no system flow error…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.