Valve assembly for hydraulic excavator, has control chamber that is connected with output channels by throttle such that slider is moved in opening direction by pressure in control chamber

摘要

The valve assembly (10) has input channel (21) and output channels (22,23) which are interconnected by a orifice (40) that is adjusted by movable slider (41). The slider is biased by a spring (42) in closing direction. A control chamber (11) is provided with movable piston (50) and connected to throttle (60). The piston is acted in direction of an end position in which the volume of control chamber is minimal, by pressure in inlet channel. The control chamber is connected with output channels by throttle such that slider is moved in opening direction by pressure in control chamber.