Proportional pumping system
US4505405A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 24, 1980 |
| Grant date | Mar 19, 1985 |
| Priority date | — |
| Expiry date | Jul 24, 2000 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29B7/7447
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A system for pumping liquid materials with reciprocating pumps driven by hydraulically operated motors, wherein the pressurized hydraulic oil which is used to drive the hydraulic motors is supplied via reciprocating proportioners. The reciprocating proportioners are driven by a reciprocating air motor operated under predetermined air pressure. The system operation is characterized in that, under blocked output pressure conditions, the air motor will inherently stall and thereby limit the pressure of the hydraulic oil acting to drive the hydraulic motors, which therefore limits the pumping pressure applied to the reciprocating pumps, and limits the output pressure of the pumped liquid materials.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.