Drive, in particular for operating valves with a fast-action device

摘要

When used on a quick-opening valve, the closing part (28) of the latter, for example, can be moved rapidly into the open position by a preloading spring (72) at the drive. To close the valve, use is made of a self-locking geared motor (88) with a toggle mechanism (54, 62) connected to its output. Provided between the geared motor (88) and the toggle mechanism (54, 62) is a clutch (82, 90) which, to open the valve, decouples the geared motor (88) from the operating spindle (46) which acts on the closing part (28). <IMAGE>