The invention discloses a balanced valve. Two control oil ducts are arranged between the control oil port of a valve body and a chamber at the end part of a valve core; control oil acts on the valve core through the two control oil dusts to realize the reversing of the valve core; a plugging part is matched with the hole of the first oil dust to close the first oil dust; a throttling groove is arranged on the end part, which is matched with the hole, of the plugging part; and the cross sectional area of the throttling groove gradually reduces along the axial direction, so that the through flow passing through the hole is slowly reduced in the process that the matched surface and the hole become closer gradually and then are plugged, thus larger pressure shock can not be generated at the moment of closing the first oil dust. Preferably, a valve core reverse control loop is provided with a hydraulic half bridge composed of a relief valve and a damp, because the pressure and the flow actin a coupling mode, and a signal output by aiming at the flow grain or the pressure gain can be stably transited to a steady-state value. The invention also provided with a crane using the balanced valve.