Fluid flow regulator
US5099875A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1991 |
| Grant date | Mar 31, 1992 |
| Priority date | — |
| Expiry date | Feb 6, 2011 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7792
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A flow limiter for use in association with a control valve for minimizing flow losses in an actuator control system to provide unrestricted control over the flow up to the desired maximum flow quantity value. A cylindrical sleeve is mounted within a housing and a piston is slidably contained within the sleeve to establish a variable chamber between the front wall of the piston and the back wall of the sleeve. A series of circumferentially spaced metering ports are contained in the variable chamber which are opened and closed by the piston. A control orifice is formed in the front wall of the piston and a biasing spring is arranged to act on the piston outside the flow path of the fluid to normally hold the piston in a home position wherein the metering ports are fully opened. The spring allows the piston to move toward a second position when the pressure over the orifice reaches a predetermined value, thus closing the metering ports to maintain the flow at a desired flow. The size of the control orifice to minimize the pressure drop over the orifice when the flow is below the desired maximum value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.