Pumping unit for a well pump
US4198820A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 1978 |
| Grant date | Apr 22, 1980 |
| Priority date | — |
| Expiry date | Aug 21, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S417/904
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pumping unit for a well pump has a surface main cylinder with a main piston reciprocable therein, the piston having a connection to a standard well pump. In a flow cylinder of a relatively large diameter, a flow piston reciprocates within and divides the flow cylinder into a first flow chamber and a second flow chamber. The first flow chamber is in communication with the main cylinder. Air under pressure substantially to counterbalance the load on the well pump connection is supplied to the second flow chamber. There is a drive cylinder divided into a first drive chamber and a second drive chamber by a drive piston connected to but substantially smaller in diameter than the flow piston. A source of liquid under relatively high pressure and a sink for liquid under relatively low pressure are joined through a reversing valve to the opposite ends of the drive cylinder through ducts controlled by a reversing valve connecting the opposite drive chambers alternately between the pressure source and the pressure sink. In one of the ducts is a throttling valve movable between a restricted flow position and an unrestricted flow position, the valve being moved in response to the position of…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.