Valve actuating arrangement

摘要

A valve actuating arrangement for ball valves, shut-off slides etc. is described. The actuating arrangement comprises a gas-hydraulic system, in which solenoid valves are connected to a gas pipeline via lines. The electromagnets of the valves are energised or de-energised in order to conduct the gas flowing through the gas pipeline directly to the corresponding cylinder chambers of the valve actuating arrangement or to supply the gas to pressure vessels in order to pressurise a hydraulic flow medium contained in the pressure vessels and to supply this to the corresponding cylinder chambers. As a result, the valve shaft of a valve built into the gas pipeline is driven. A gas pressure detection device is provided in order to energise or de-energise the electromagnets of the solenoid valves and to close the valve when the gas pressure detected by the gas pressure detection device lies below a predetermined gas pressure or when the gas pressure detected falls over a predetermined period of time at a rate which is greater than a predetermined rate.