Fluid power valve device
US4846216A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 5, 1988 |
| Grant date | Jul 11, 1989 |
| Priority date | — |
| Expiry date | Jul 5, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7905
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid power control valve apparatus is disclosed and is characterized by combining desirable features of both a spool type valve element and a poppet type valve element. A spool element is provided with one end adapted to be seated in a poppet valve seat provided in the bore in which the spool is slideably mounted. The poppet seat is located in the bore between two flow ports. The poppet end of the spool engages and becomes fully seated only after the spool has passed a bore position closing one of the ports to operative flow and operates to seal the bore from the conventional leakage flow associated with spool elements. Also disclosed is a method of manufacturing such an apparatus in a two piece assembly to greatly simplify manufacture of a precise poppet seat within the spool bore.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.