Valve block with valve arrangement

Abstract

The invention relates to a valve block having a plurality of control valve discs forming a first group part and a second group part. The inflow pressure for the control valve disks of the first group of parts is limited in this case via a common pressure limiting valve. The pressure limiting valve is arranged in such a way that the corresponding load pressure tapped off via the control valve disk does not exceed a defined value. In contrast, no limitation of the inflow pressure of the control valve disks of the second group of parts is provided.

Description

technical field

[0001] The invention is based on a valve arrangement and a valve block according to the preamble of claim 1 . Background technique

[0002] Such hydraulic valve arrangements or control systems are known from the prior art and have so-called "load sensing" control valves with a control piston for direction control and speed control. A metering flap is formed in the control piston. In this case, the respective control valve is associated with a pressure balance, which keeps the pressure drop over the respective metering flap and the volume flow constant, independent of the load. For this, the pressure upstream and downstream of the metering flap is measured and reported to the pressure balance. In the normally open neutral position, the piston of the pressure balance is prestressed by a spring which exerts an ideally constant force. In addition to the spring, the load pressure tapped downstream of the metering flap acts in the opening direction of the piston...

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