Hydraulic oil well pumping apparatus
US8678082B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 7, 2012 |
| Grant date | Mar 25, 2014 |
| Priority date | — |
| Expiry date | Aug 7, 2032 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S417/904
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pumping arrangement employs a compensating type hydraulic pump, a directional valving arrangement and a proportioning valving arrangement. When the directional valve is energized, oil is directed to the rod end of the hydraulic cylinder. The rod or piston part of the hydraulic cylinder will then elevate until a first limit switch is actuated which then will de-energize the directional valve and send a current signal to the proportional valve. This current signal to the proportional valve forces it to open to a point at which the cylinder rod would extend at the desired velocity until it reaches a second limit switch. The current signal to the proportional valve is then decreased, creating a choking arrangement that forces the cylinder rod to decelerate. Upon reaching the third limit switch, the signal is removed from the proportional valve so that it closes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.