Pilot device for a safety valve

US6386228B1 · kind B1 · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Hermann-Josef Conrads · Herzogenaurach, DE
• Erwin Laurer
• Jurgen Model · Erlangen, DE

Key dates

• Filing date: Dec 4, 2000
• Grant date: May 14, 2002
• Expiry date: Feb 12, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7769
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A control device includes a pressure-displacement transducer for triggering a control part for activating a safety valve of a pressure vessel. A space in the pressure-displacement transducer can be connected to a blow-off tank through a drainage line. A first embodiment includes a switchover valve device which is associated with the drainage line and connects the space to a take-off line instead of to the blow-off tank when the pressure in the blow-off tank is above a limiting pressure. A second embodiment includes a hydraulic compensating system which exerts a first force on the pressure-displacement transducer, from a pressure in the blow-off tank. That force counteracts a second force produced in the space by that pressure and in particular compensates for that force.