Slide valve
US4211255A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 14, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | Dec 14, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86879
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A slide valve has a spool valve element that is moved unidirectionally to a sequence of three positions during its operating cycle. The valve structure and unidirectional motion of the spool provide a precompression of the fluid being handled. The valve structure also permits relief of excess downstream pressure. Preferably hydraulic liquid is used to drive, position, and reset the spool valve. The spool valve itself has a hollow body with one groove on its outside surface and a valve body with a port at one end that is always in communication with the hollow portion of the spool valve. The slide valve is especially designed for and preferably used in a liquid reaction molding system to direct a reagent between a source (e.g. reservoir) and a destination (e.g. a mixing head). When applied to such a reaction molding system each slide valve replaces three conventional ball valves and one check valve and yet provides the additional features of precompression and relief of excess pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.