| 摘要 |
Electrohydraulic servodrive for driving a door, window, etc. comprises a hydraulically controlled open-holding valve (20) arranged in the hydraulic circuit for carrying out an open-holding function. Preferred Features: The valve is a 2/2-way valve (21) in the form of a blockable non-return valve or a sliding valve. The valve has a control piston (22) and a non-return valve (23). |
