Valve arrangement

US4727902A · kind A · utility

Assignee

• Rheinmetall GmbH · DE

Inventors

• Klaus Unterstein · Goldkronach, DE
• Sigfrid Buchele-Buecher · Osterath, DE

Key dates

• Filing date: Aug 5, 1986
• Grant date: Mar 1, 1988
• Expiry date: Aug 5, 2006

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7929
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pressure relief valve for a hot gas generator is constructed as a valve arrangement which can be subjected to high temperature shocks and abrasion causing gaseous streams. The valve arrangement is constructed so as to have a prolonged operative life despite such operative demands, whereby simultaneously the predetermined pressure resistance for this valve arrangement is precisely maintained. For this purpose the valve arrangement includes a piston of substantially longitudinal cylindrical shape which has hemispherically shaped ends. A coil spring is operatively maintained behind the piston between a pair of end pieces which bias the piston towards a combustion chamber. The valve arrangement includes a valve body in which the piston is slidably moved. The valve body is made of a high temperature molybdenum alloy, whereas the piston, the seat and the end pieces for the coil spring 16 are made of a material having poor heat conduction characteristics, preferably silicon nitride.