Pressure regulating chemical injector valve
US5427151A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 18, 1994 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | May 18, 2014 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87643
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A chemical injector valve connected to a source of water under pressure harnesses the venturi effect to entrain liquid chemicals into a water stream and employs a variable size pressure chamber to ensure that the flow rate and quantity of chemicals entrained remains constant even when the pressure of water entering the valve varies widely. An increase in incoming water pressure causes expansion of the variable size pressure chamber and a decrease in incoming water pressure causes contraction of the variable size pressure chamber. A slidably mounted piston is biased toward the variable size pressure chamber so that the size of the pressure chamber does not increase unless the accumulation of water in the chamber exceeds the bias acting on the piston. When the bias is exceeded, a shank of the piston moves toward a piston stop and the flow of water into the valve is throttled. When the bias is not exceeded, the shank of the piston moves away from the piston stop, the size of the pressure chamber is decreased, and the flow rate of water into the pressure chamber is increased. An entrainment chamber of fixed size is in open fluid communication with the variable size pressure chamber and…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.