Combination check valve and neutral valve assembly for use in a hydraulic component
US7296594B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 2005 |
| Grant date | Nov 20, 2007 |
| Priority date | — |
| Expiry date | Nov 26, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/87394
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A combination neutral valve and check valve assembly is provided for use in connection with a closed hydraulic circuit and a sump such as in a hydrostatic transmission. A cage and check poppet are mounted in a valve body having an opening between the hydraulic circuit and sump. The check poppet is movable between a first position where it closes the valve opening and a second position where it is disengaged from the opening. A check compression spring is mounted in the cage and biases the poppet to the engaged position. A valve shuttle is located in the check poppet and movable between a first position where it closes a check poppet opening and a second position where it is disengaged from the opening. A neutral valve spring is engaged to the valve shuttle and the check poppet to bias the valve shuttle to the disengaged position.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.