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Ibrisimbegovic, Esad

Bisig, Roland

Esad Ibrisimbegovic

Roland Bisig

A control device () for a hydraulic elevator drive () with a first and second control valve () for controlling the volume flow of a working fluid wherein the flow is detected () and compared () with a reference value () and a pilot () with a first and second pilot valve () to control the first and second control valve in which the pilot has an actuator () and a coupler () that can activate and decouple each pilot valve. A hydraulic drive system () for an elevator having the control device and a method for retrofitting such a drive system. The control device is simple in design and operation and provides for cost advantages and an increased reliability. The hydraulic drive system with the control device permits an overall improvement in the starting quality of an elevator by automatic compensation of drive-side and output-side interference variables and load-induced fluctuations in the working fluid pressure.

Control device for a hydraulic elevator drive

A valve provided for the blocking or controlled establishment of a volume flow of a working fluid in a flow path of a technical device that transmits and/or stores energy, in particular in a control device for a hydraulic drive, an associated method of manufacture of the valve, and an apparatus with the valve. The valve includes first, second, and third valve openings, a moveable shut-off body moveable between an open-position and a close-position, a guide which guides the shut-off body between the open-position and the close position, and a retainer which exerts a retaining force on the shut-off body in the close-position. The guide has three guide parts. The first and third guide parts enclose the shut-off body and the second guide part includes a plurality of pins in a parallel orientation to the direction of movement of the shut-off body.

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Steinhausen, Switzerland

Esad Ibrisimbegovic