Bypass valve used to control the movement and blocking of the actuator in both directions, performing controlled lowering of the load, which does not slip under its own weight, as the valve prevents cavitation of the actuator. It is not subject to pressure feedback and is therefore ideal for use where normal balancing valves do not function properly for load control. It allows the pressure set by the system to be used to operate multiple actuators in series. Flange connections allow the valve to be mounted directly on the actuator.