Fluid-switchable flow rate control system
US6314992A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Apr 24, 2000 |
| Grant date | Nov 13, 2001 |
| Priority date | — |
| Expiry date | Apr 24, 2020 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7761
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A fluid-switchable flow rate control system that permits free changing of the full scale flow rate and which can control a plurality of kinds of fluids with high precision. The fluid-switchable flow rate control system controls the flow rate of fluid with the pressure P.sub.1 on the upstream side of the orifice member held about twice or more higher than the downstream pressure P.sub.2, the fluid-switchable flow rate control system comprising an orifice member 8 replaceable with another to provide a suitable orifice diameter according to the kind of fluid and the flow rate range, a control valve 2 provided on the upstream side thereof, a pressure detector 6 provided between the control valve 2 and the orifice member 8, a flow rate calculation circuit 14 where from the pressure P.sub.1 detected by the pressure detector, the flow rate Qc is calculated with the equation Qc=KP.sub.1 (K=constant), a flow rate-setting circuit 16 for outputting flow rate setting signal Qe, a flow rate conversion circuit 18 for multiplying the calculated flow rate signal Qc by the flow rate conversion rate k into switch-over calculated flow rate signal Qf (Qf=kQc) to change the full scale flow rate, and a …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.