High-pressure to low-pressure changeover valve for a positive displacement pump
US10514027B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 2014 |
| Grant date | Dec 24, 2019 |
| Priority date | — |
| Expiry date | Sep 9, 2036 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/16
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A positive displacement pump includes two fluid flow paths, two center sections with a common fluid valve, a changeover valve, and three fluid displacement members. Each center section contains a diaphragm shaft, and the two sections are separated by the third diaphragm. In low-pressure mode the pump operates as a typical positive displacement pump with pumping fluid supplied to one center section and the changeover valve allowing the fluid to freely circulate within the second center section. In high-pressure mode, the changeover valve is switched and the changeover valve allows the common fluid valve to supply pumping fluid to both center sections to drive the fluid displacement members therein, which generates a higher outlet fluid pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.