Proportioning pump
US5170912A · kind A · utility
Inventor
Key dates
| Filing date | Sep 7, 1990 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Sep 7, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB67D1/105
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A proportioning pump has a first piston and cylinder, a second piston and cylinder, a shaft connecting the first and second pistons, a spring for biasing the first and second pistons in a first position, a shuttle valve for controlling flow through the first cylinder, and two check valves for controlling flow through the second cylinder. The proportioning pump is used to dispense a predetermined ratio of two fluids. A pressurized first fluid fills the first cylinder and forces the first piston to move to a second position. The motion of the first piston is communicated to the second piston via the shaft. Movement of the second piston draws the second fluid through a check valve into the second cylinder. When both the first and second cylinders are full the shuttle valve closes the inlet to the first cylinder and opens the outlet. The spring then urges the first and second pistons back to their first positions, thus forcing the two fluids from their respective cylinders. The two check valves prevent reverse flow through the second cylinder. The ratio of the volume of the two fluids being pumped can be varied by changing the second cylinder and piston. An accumulator is used to provi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.