Orifice for pressure type flow rate control unit and process for manufacturing orifice
US6158679A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Jun 16, 1999 |
| Grant date | Dec 12, 2000 |
| Priority date | — |
| Expiry date | Jun 16, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D7/0186
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An orifice for a pressure-type flow rate controller, which can be produced by a simple method at a low cost, that provides a linearity--between the pressure P1 on the upstream side of the orifice and the flow rate--over a wide range of the pressure ratio P2/P1 of the pressure P2 on the downstream side of the orifice to the upstream pressure P1 and that permits adjustment with ease of flow characteristics among a plurality of orifices. The orifice comprises an inlet taper 1 in the shape of a bugle and a short narrowed straight section 2 adjoining the inlet taper 1, both formed by cutting one opening end of a preliminary hole 6 made in an orifice plate D, and further comprises a short inner taper 3 and an enlarged straight section 4 connecting with the taper 3 which are formed by enlarging the preliminary hole 6 at the other opening end, the short inner taper 3 adjoining the narrowed straight section 2 on one side and neighboring the enlarged straight section 4 on the other side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.