A metering valve has a closing member and a valve seat. The closing member is movable between a closed position on the valve seat sealing a material outlet, and an open position raised above the valve seat leaving the outlet clear. An actuating element rigidly connected to the closing member is arranged between first and second piezo-actuators at a distance from the first piezo-actuator in the closed position less than the maximum length change of the first piezo-actuator, or lies loosely thereon and at a distance from the second piezo-actuator longer than the maximum length change of the first piezo-actuator. The actuating element in the open position is arranged at a distance from the second piezo-actuator less than the maximum length change of the second piezo-actuator, or lies loosely thereon and at a distance from the first piezo-actuator greater than the maximum length change of the second piezo-actuator.