Patent ID: 7617841
Filing Date: 2009-11-17
Classification: F15B,F16K,G05D,Y10T

Abstract:
1. A hydraulic system including a hydraulic pump, a load, an actuator for moving the load, a control valve fluidly connected to the actuator, at least two branches parallel to each other and fluidly connected between the hydraulic pump and the control valve with each branch including at least one damper, and at least one slide valve arranged in one of the branches, the slide valve comprising: a valve housing having a passage channel with a slide bore extending in a direction transverse to the passage channel; and a slide supported within and longitudinally movable relative to the slide bore between an open position and a blocking position, the slide having a head, a blocking portion defining a blocking position when the blocking portion is aligned with the passage channel, and a pin portion connecting the head to the blocking portion and defining an open position when the pin portion is aligned with the passage channel, wherein the blocking portion divides the slide bore into a chamber, wherein at least one channel is provided that permits fluid communication between the chamber and the passage channel, thereby allowing the chamber to be subjected to the fluid pressure prevailing in the passage channel, wherein, when the pressure in the passage channel exceeds a predetermined fluid pressure, the slide moves to its blocking position.