Pneumatically shifted reciprocating pump
US5893707A · kind A · utility
Inventors
Key dates
| Filing date | Mar 5, 1997 |
| Grant date | Apr 13, 1999 |
| Priority date | — |
| Expiry date | Mar 5, 2017 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B43/1136
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pneumatically actuated reciprocating fluid pump and spool valve combination is pneumatically shifted by pressurized air that exhausts from a respective pressurized bellows, diaphragm, or piston chamber, as the bellows, etc. nears the end of its pressure stroke (the exhaust stroke of the pumped fluid). This pressurized air exhausts from the bellows chamber via a shift piston and canister mechanism that seals on the face of the shift canister, rather than on its periphery. The pressurized air exhaust from the bellows chamber acts on the end of the valve spool element to shift the spool element to its opposite position, which reverses the application of pneumatic pressure and atmospheric exhaust between the two bellows chambers to actuate the reciprocating pump.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.