Valve arrangement and control method

US11359650B2 · kind B2 · utility

Assignee

• Aventics GmbH · DE

Inventor

• Stefan Tadje · Hannöver, DE

Key dates

• Filing date: Oct 3, 2018
• Grant date: Jun 14, 2022
• Expiry date: Jul 29, 2039

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/8855
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

For the purpose of providing a valve arrangement for controlling pneumatic drives with protection against a sudden automatic change in the initial switching position without an input signal in the event of a fault in a resetting device of a pilot stage and, for this situation, effective fault identification by purely pneumatic means, said valve arrangement comprises a first and a second working connection (1; 2), which can be connected to a drive, and a first and a second electropneumatically pilot-controlled directional valve, in which valve arrangement one or both directional valves is or are arranged upstream of the working connections (1; 2) for the purpose of influencing and venting said working connections, wherein the pilot stages of both directional valves are of automatically resetting design and the second directional valve is designed for alternately assuming an inoperative position and a switching position and the pilot stage of the first directional valve has an external control connection (8; 8′) which can be influenced by means of the second directional valve in its switching position and can be vented by means of said second directional valve in its inoperative posi…