Multi-stage hydraulic pressure limitation value for operation of equipment, includes valve sleeve displaceable in relation to auxiliary pressure to take up different positions

摘要

Pressure limitation valves operate between a low-pressure region and a proportional control region; as well as a pressure limiting region in which the control pressure is limited to a maximum pressure. To allow switching between pressure stages an axially displaceable valve sleeve (8) surrounding the valve piston (9) has a low-pressure feed (42), a high pressure feed (43) and a control pressure discharge (43), which joins to the high-pressure feed (44), when the pressure is lower than a limiting pressure.