Internal valve
US4312373A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 24, 1980 |
| Grant date | Jan 26, 1982 |
| Priority date | — |
| Expiry date | Mar 24, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/731
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An internal valve for the bottom loading of fuel tanks consists of a differential area piston acting within a chamber which is vented by a pair of pilot valves responsive to fluid level, to provide full open, throttled and closed positions of the valve automatically in response to inlet fluid pressure. Soft closure of the inlet valve which is formed of the piston head and a seat in the valve housing, is provided by metered fluid flow through an orifice between a sized aperture in the piston head and a restrictor sleeve carried on a tank vent actuator bar extending through the aperture and through the valve housing. A lost motion connection between the piston head and actuator bar allows limited relative movement for controlling the metering orifice and combined movement for coincident opening of the tank vent in response either to inlet fluid pressure or manual actuation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.