Flow responsive pressure regulating unloader
US5694966A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1995 |
| Grant date | Dec 9, 1997 |
| Priority date | — |
| Expiry date | Jun 29, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/8733
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A flow responsive pressure regulating unloader suitable for use between a positive displacement fluid pump and a fluid consuming device connected to the pump. The unloader includes a housing having an inlet port connected to an outlet port, and a by-pass port. A fluid pressure regulating valve is connected between the inlet port and the by-pass port to limit the maximum fluid pressure at the inlet port. A flow responsive valve also is connected between the inlet port and the by-pass port. Fluid flow from the inlet port to the outlet port creates a pressure drop across an orifice. The pressure differential is applied across a piston to close the flow responsive valve. When flow from the outlet ceases, the pressures across the piston become equal and the fluid pressure on the flow responsive valve opens the valve to divert fluid to the by-pass port.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.