Valve for controlling pressure and flow
US5495963A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 24, 1994 |
| Grant date | Mar 5, 1996 |
| Priority date | — |
| Expiry date | Jan 24, 2014 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16K47/12
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A variable restrictor valve for use in an intermittent dispensing system having a recirculation loop. The restrictor valve establishes a more linear relationship between the amount of adjustment made thereto and the resulting pressure drop over the restrictor valve in the recirculation loop. A first embodiment of the restrictor valve changes the length of the flow path created by a helical groove to thereby adjust the flow resistance through the valve. A second embodiment uses a valve member in the form of a perforated cylindrical tube which is adjustable to present a varying number of perforations as the inlet to the tube and thereby allow adjustment of the flow resistance. A third embodiment utilizes a helical spring as a valve member in which adjustable spacing between the coils of the spring provides adjustability of the flow rate through the spring.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.