Reciprocating pump
US4717317A · kind A · utility
7Cited by
11References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1985 |
| Grant date | Jan 5, 1988 |
| Priority date | — |
| Expiry date | Nov 22, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/008
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
The reciprocating pump is provided with a sleeve between the piston and the casing. The sleeve is disposed in spaced relation to define an annular gap both with respect to the piston and with respect to the casing. The sleeve is also biased by a spring into sealing engagement with the end wall of the casing. The end of the sleeve adjacent to the spring provides a permanent connection between the gap between the casing and sleeve and the pressure medium used to drive the piston of the pump so that the same pressure prevails on the inside and outside surfaces of the sleeve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.