Hydraulic auxiliary valve device adapted to be connected to a hydraulic main valve on a work vehicle, which work vehicle comprises a hydraulic system including a pump and a tank, the auxiliary valve device comprising: - a first motor port connection and a second motor port connection arranged to be connected to a first motor port and a second motor port, respectively, on a double acting hydraulic motor, in particular a double acting hydraulic cylinder, - an inlet connection adapted to be connected to a hydraulic system on the work vehicle, which inlet connection comprises a pump input port connection, for connection to the pump of the hydraulic system, and a tank input port connection for connection to the tank of the hydraulic system; - an outlet connection adapted to be connected to the main valve, which outlet connection comprises a pump connection output port for connection to a pump input port on the main valve, and a tank connection output port, for connection to a tank input port on the main valve; - a pump lead-through, which connects the pump input port connection of the auxiliary valve device to the pump connection output port; - a tank lead-through, which connects the tank input port connection of the auxiliary valve device to the tank connection output port; and - a control valve provided with two open positions, which control valve in the first open position connects the pump input port connection to the first motor port connection and the tank input port connection to the second motor port connection, and in the second open position connects the pump input port connection to the second motor port connection and the tank input port connection to the first motor port connection, characterized in that the pump lead-through consists of a first nipple and the tank lead-through consists of a second nipple, each of the nipples having two ends, which constitute the connection ports (2A, 2B; 3A, 3B) of the respective lead-throughs, wherein the nipples between their ends comprise openings (2C and 3C) arranged for connection to the control valve to connect the pump input port connection and the tank input port connection to the motor port connections (4A, 4B) of the auxiliary valve device. - a first motor port connection and a second motor port connection arranged to be connected to a first motor port and a second motor port, respectively, on a double acting hydraulic motor, in particular a double acting hydraulic cylinder, - an inlet connection adapted to be connected to a hydraulic system on the work vehicle, which inlet connection comprises a pump input port connection, for connection to the pump of the hydraulic system, and a tank input port connection for connection to the tank of the hydraulic system; - an outlet connection adapted to be connected to the main valve, which outlet connection comprises a pump connection output port for connection to a pump input port on the main valve, and a tank connection output port, for connection to a tank input port on the main valve; - a pump lead-through, which connects the pump input port connection of the auxiliary valve device to the pump connection output port; - a tank lead-through, which connects the tank input port connection of the auxiliary valve device to the tank connection output port; and - a control valve provided with two open positions, which control valve in the first open position connects the pump input port connection to the first motor port connection and the tank input port connection to the second motor port connection, and in the second open position connects the pump input port connection to the second motor port connection and the tank input port connection to the first motor port connection,