Control device for hydraulic piston/cylinder unit

A control device for a hydraulic work cylinder, comprising a housing having an inlet and an outlet, and a valve seat;

• a shut-off valve having a valve body cooperating with said valve seat of said housing and having a further valve seat, said valve body having an obtuse-angled cone which passes into a fine-control cone, and a transition provided between said cones and being rounded;
• a pilot valve member arranged in said valve body and cooperating with said further valve seat of said valve body under the action of a spring force, said housing and said valve body forming therebetween a pressure chamber so that said valve body under the action of a pressure in said pressure chamber is pressed against said valve seat of said housing, said pilot valve member having a valve member part and a plurality of pilot portions arranged in series;
• two throttles arranged in series so that said pressure chamber communicates with said inlet of said housing through said throttles and said pilot valve member is located between said throttles, said pilot valve member being arranged so that pressure forces acting on said pilot valve member are compensated, said pressure chamber being connected with said outlet of said housing through said pilot valve member and a passage which opens by said pilot valve member.