Actuating valve for bidirectional pneumatic cylinder and use of such actuating valve for bobbin creels controlled by pneumatic cylinders

US6848641B2 · kind B2 · utility

Assignee

• Volkmann GMBH · DE

Inventors

• Ralf Lohmann · Schwalmtal, DE
• Georg Heinen · Jülich, DE
• Jorg Zischewski · Willich, DE

Key dates

• Filing date: Apr 25, 2003
• Grant date: Feb 1, 2005
• Expiry date: Jun 23, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F15B2211/7107
• WIPO field: Handling
• WIPO sector: Mechanical engineering

Abstract

An actuating valve has two relay valves connected to a compressed air source and a pneumatic cylinder with two pressure chambers. When one relay valve is actuated, one pressure chamber is pressure-loaded and the other is relieved. Two 3/2 port directional control valves are arranged upstream of the pneumatic cylinder. Two check valves are positioned in branch lines connecting the relay valves and the directional control valves. A control line connects the branch line to the other directional control valve, respectively. The directional control valves are moveable between a first position allowing compressed air to pass and a pressure relief position. When the relay valves are inactive, the directional control valves are in the first position and the relay valves are in a venting position for the branch lines. When one relay valve is actuated, it assumes a position allowing passage of air to the branch line connected to it.