Pump with spring loaded valve
US4486152A · kind A · utility
10Cited by
11References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1980 |
| Grant date | Dec 4, 1984 |
| Priority date | — |
| Expiry date | Nov 21, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B7/0073
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A hydraulic pump having spring loaded valves utilizes a spring providing a constant spring force and a spring providing a varying spring force. The varying spring force depending upon the position of the pump piston. The pump suction valve opens after a variable delay relative to the beginning of the piston suction phase when the pressure prevailing in the pump's dead chamber falls below a predetermined value. Abrupt decompression to the dead chamber is therefore avoided resulting in reduced energy consumption and noise level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.