Drip irrigation system
US4190206A · kind A · utility
16Cited by
3References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1978 |
| Grant date | Feb 26, 1980 |
| Priority date | — |
| Expiry date | Jun 30, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02A40/22
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A drip irrigation system which includes a flow control valve having an inlet opening which constricts in response to pressure increases to provide a uniform flow despite pressure variations. The inlet opening of the valve has a rectangularly cross-sectioned central section and end sections which are non-rectangular, such as triangular or semi-circular, in cross section. During normal flow conditions the rectangular central section of the inlet opening is pressed closed and irrigation liquid flows at a constant rate through the two end sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.