Hydraulic vehicle parking platform hoist control - has return, volume control and circumventing return valves preceding safety valve

摘要

A hydraulic cylinder, driving a vertically movable platform, has a pipe fracture safety valve blocking it, if a set lowering speed is exceeded. It is used on a mechanism for parking motor vehicles. Between this valve and the pressure supply there is a valve assembly comprising a releasable return valve controlled by a throttle return valve; together with a volume control valve to regulate flow from this during lowering; and a parallel circumventing return valve, for unthrottled hoisting. All these are located in a common valve block. This permits undisturbed operation in the presence of a sensitive safety valve, with straightforward assembly.