Valve for an adsorption heat pump, having - a first channel, a second channel, a third channel, - a first valve unit, which opens and closes the first channel and comprises a first valve body and a first valve seat, - a second valve unit, which opens and closes the second channel and comprises a second valve body and a second valve seat, - a spring element, which is arranged pre-tensioned between the first valve body and the second valve body and subjects the first valve body to a closing force in the direction of the first valve seat and the second valve body to a closing force in the direction of the second valve seat, - having an actuating drive, which has a control rod, which engages through the first valve body and the second valve body, - having a first driver element and a second driver element, which in each case are held on the control rod and are arranged in such a manner that the two valve bodies (90, 100) and the spring element are arranged between the two driver elements (110, 111), - wherein the valve has a closed position, in which the first valve unit and the second valve unit are closed, - wherein the valve has a first open position, in which the first valve unit is completely open, - wherein the valve has a second open position, in which the second valve unit is completely open, and - wherein the valve has at least one intermediate position, in which one of the two valve units (88, 98) is partially open, characterised in that - the valve is designed in such a manner that the actuating drive can hold the valve in the closed position, in the open positions (72, 74) and in the at least one intermediate position without power - that the actuating drive has a stepping motor and a gear unit, wherein the stepping motor and the gear unit are designed in such a manner that an electroless holding torque is sufficient in order to hold the valve in the positions (70, 72, 74, 75), - that a valve opening characteristic curve of the valve units (88, 98), which describes a flow coefficient dependent on an adjustment path, is not linear, and - that the valve opening characteristic curve has at least one flattened region. - a first channel, a second channel, a third channel, - a first valve unit, which opens and closes the first channel and comprises a first valve body and a first valve seat, - a second valve unit, which opens and closes the second channel and comprises a second valve body and a second valve seat, - a spring element, which is arranged pre-tensioned between the first valve body and the second valve body and subjects the first valve body to a closing force in the direction of the first valve seat and the second valve body to a closing force in the direction of the second valve seat, - having an actuating drive, which has a control rod, which engages through the first valve body and the second valve body, - having a first driver element and a second driver element, which in each case are held on the control rod and are arranged in such a manner that the two valve bodies (90, 100) and the spring element are arranged between the two driver elements (110, 111), - wherein the valve has a closed position, in which the first valve unit and the second valve unit are closed, - wherein the valve has a first open position, in which the first valve unit is completely open, - wherein the valve has a second open position, in which the second valve unit is completely open, and - wherein the valve has at least one intermediate position, in which one of the two valve units (88, 98) is partially open, - the valve is designed in such a manner that the actuating drive can hold the valve in the closed position, in the open positions (72, 74) and in the at least one intermediate position without power - that the actuating drive has a stepping motor and a gear unit, wherein the stepping motor and the gear unit are designed in such a manner that an electroless holding torque is sufficient in order to hold the valve in the positions (70, 72, 74, 75), - that a valve opening characteristic curve of the valve units (88, 98), which describes a flow coefficient dependent on an adjustment path, is not linear, and - that the valve opening characteristic curve has at least one flattened region.