Torque and high pressure limiting control for variable displacement pumps
US4381646A · kind A · utility
5Cited by
6References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 12, 1980 |
| Grant date | May 3, 1983 |
| Priority date | — |
| Expiry date | Sep 12, 2000 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B49/08
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
It is common practice to provide the servo-system for a variable displacement pump with a "load-plus" valve to maintain pump discharge pressure above a minimum pressure level and above a load pressure in a fluid actuator connected to the pump in response to the load pressure in the actuator. Systems of this type are normally lacking in a device for ensuring that the prime mover for the pump functions at maximum efficiency. This invention is directed to a pressure and horsepower limiting valve (24) for ensuring such efficiency by modulating a load pressure signal (P.sub.L) communicated to the "load-plus" valve (23).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.