Dynamic pressure limitation with safety valve

US4750459A · kind A · utility

Inventor

• Alfred Schmidt · Seevetal, DE

Key dates

• Filing date: Jul 16, 1986
• Grant date: Jun 14, 1988
• Expiry date: Jul 16, 2006

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D9/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A dynamic pressure-limiting device in an engine exhaust brake, wherein the edge surface of a butterfly disc valve in its closed position is bypassed at one point by a poppet valve bore in which is slidably arranged a poppet valve head which is resiliently urged into the closed position by a spring to provide a safety valve which responds with greater reliability when the upper dynamic pressure limit is exceeded, the response being matched to the amount the limit is exceeded, includes a narrow gap between the butterfly valve disc in its closed position and the poppet valve head in its closed position, and the characteristic of the spring rises at a ratio of spring force (N) to spring deflection (mm) of 1.5-2.5:1. Allowance is made in determining the spring characteristic for the suction effect of the flowing gas on the poppet valve head.