Safety valve

US6591856B1 · kind B1 · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Uwe Meinig · Bad Saulgau, DE
• Jorg Bittner · Hemsbach, DE

Key dates

• Filing date: Oct 31, 2001
• Grant date: Jul 15, 2003
• Expiry date: Oct 31, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/86324
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A safety valve, such as for a refueling vent line between the tank filler neck and the active charcoal container in a motor vehicle. The safety valve is inserted into the refueling vent line being configured as a float valve. When fuel penetrates into the refueling vent line, and thereby into the safety valve, the outlet of the safety valve is closed by the float. The safety valve is provided with an anti-pollution pipe-end opening onto the environment and closed at normal pressure by a closure operated by a diaphragm. At an elevated pressure in the safety valve, the diaphragm effects an opening of the closure at the anti-pollution pipe-end.