Fluid-powered submersible sampling pump
US4295801A · kind A · utility
Inventor
Key dates
| Filing date | Jul 31, 1979 |
| Grant date | Oct 20, 1981 |
| Priority date | — |
| Expiry date | Jul 31, 1999 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B47/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A small diameter fluid-driven pump for subterranean fluid sampling, and including an elongated cylindrical body formed by a centrally disposed control valve block assembly and a pair of hollow motor piston chambers on opposite sides of the valve block and joined thereto. Within the centrally disposed control valve block assembly in axial alignment with the motor pistons are a spool pilot valve and a spool fluid distribution valve. The spool pilot valve is constructed to obviate stalling during its reciprocation under the impress of a power fluid directed thereto, and it functions to control the shifting of the distribution valve to which it is internally connected within the valve block assembly. The spool pilot valve includes a valve housing defining a large central piston chamber, a relatively small bore extending axially inwardly from one end of the valve housing, and into communication with the large central piston chamber, and a larger bore of smaller diameter than the central piston chamber extending axially into the opposite end of the valve housing into communication with the central piston chamber. A small piston is slidably positioned in the relatively small bore, a large…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.