Controlled suspension circuit suited for use with flow medium circuit and source of flow medium under pressure connected by pilot-operated direction control valve to operating device

摘要

The suspension circuit is used with a flow medium circuit (10) and with a source of flow medium under pressure, connected by a pilot-operated direction control valve to an operating device with first and second inlet connections and a reservoir. The flow medium circuit has also a source of pilot-flow medium under pressure that is connected operatively by a pilot valve arrangement to the pilot-operated direction control valve. The controlled suspension circuit has: a load reduction valve arrangement with a pilot-operated proportional valve which is located between the first inlet connection and the reservoir plus a relief and refill valve which is located between the first inlet connection of the operating device and the reservoir. The pilot-operated proportional valve is pre-tensioned by a spring into a flow-blocking position and can be controlled movably to a flow release position, furthermore responding to the reception of the pilot flow medium under pressure from the pilot valve arrangement. There is also a pilot-operated non-return valve plus two electrically controlled valves.