Abstract: Disclosed is a flow blocking valve, a vacuum lifting device have such valve, a vacuum lifting arrangements, and methods for operating the same, the valve including a valve housing part forming a flow duct between a flow inlet arranged at an inlet end of the duct and a flow outlet arranged at an outlet end of the duct, where a seat is arranged at the flow outlet, the valve further including a displaceable valve blocking device arranged to move inside the flow duct, where said blocking device is arranged to block the flow through said valve when being forced against said seat, the valve also including obstruction means being displaceable in a direction substantially transverse in relation to a longitudinal direction of the flow duct, where the obstruction means is arranged to controllably obstruct the passage of the displaceable valve blocking device without completely disabling flow through the flow duct.