Patent ID: 7044442

Claim:
Valve block ( 1 ) for a control device, in particular for a hydrostatic machine, comprising a valve ( 9 ) the valve piston ( 14 ) of which is subjected to the action of a control pressure when in its open position and to the action of a return spring ( 18 ) when in its closed position, the closing force of the return spring ( 15 ) being able to be reduced or increased by means of an actuator ( 16 a ) which can be displaced towards a position which increases the closing force and a position which reduces the closing force, characterised in that the displacing movement of the actuator ( 16 a ) in the direction of movement which increases the closing force of the return spring ( 15 ) is limited by a stop element ( 112 ) in a position in which the closing force of the return spring ( 15 ) reaches its limited maximum value.