Hydraulic control system with pressure regulating valve

摘要

The pressure regulating valve (44) is contained in a return pipe (42) connecting a manifold pressure regulating valve (8) to a hydraulic pressure source. The pressure regulating valve has a valve housing recess with top and bottom ends, a first opening (46) connected to an inflow pipe, and a second opening (48) connected to a discharge pipe. The valve housing recess contains a valve slide-piece (50) which selectively opens the second opening. An elastic element pretensions the valve slide piece towards the top end of the valve housing recess. The valve slide piece has a second opening closure and opening piece.