Tanker roll shut-off vent valve assembly
US6142167A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 1, 1999 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Mar 1, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/7779
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A vent valve assembly with roll over shut-off capability includes a housing, a vent valve that opens to allow vapor to escape from the tank in response to tank vapor pressure greater than a predetermined positive pressure and that opens to allow air or vapor entrance to the tank in response to tank vapor pressure below a predetermined negative pressure. A roll over valve is provided to open and close the fluid flow path between the vent valve and the tank interior, and a rocker arm assembly is rotatably mounted to the housing for positioning the roll over valve in the open position when the tanker is upright and for moving the roll over valve to the closed position when the tanker rolls more than a predetermined angle relative to the upright position. Stored liquid rising above the shut-off valve applies a further force closing the shut-off valve in relation to the head pressure. In one example, the roll over valve is a poppet type mounted below the vent valve assembly, the rocker arm is weighted below the rocker arm pivot, and the rocker arm includes a cam that forces the poppet upward to close in response to tank roll over.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.