Abstract: A seated-type valve S provided for the double-acted cylinder Z of an electric disconnector TS, comprises a housing G containing a slider closure element 7 and a separating actuating force generator C1 and a switch-on actuating force generator C2 for the slider closure element 7, respectively. At least the separating actuating force generator C1 is equipped with a piston D1 contained in an interior bore 23 of the slider closure element 7, which piston D1 abuts in the housing G without generating lateral forces for the slider element 7.

Abstract: An electromotor M of a electrohydraulic motor pump aggregate G drives at least one pump stage P, P1, P3. An attached element C is inserted between at least one pressure side port of the pump stage, a return line 13, and at least one consumer port A, B, 5, 6. A multiways control valve 3 is installed between the consumer port and the pressure side port. A pressure limiting valve R1, R2 constructed as a seated valve is installed between the consumer port A, B, 5, 6 and the return line 13. The motor pump aggregate G has an automatic hydraulic pressure relieving device D for relieving the system pressure whenever the electromotor M is switched off.

Abstract: A seated valve comprising a housing and a valve seat, a cylinder bushing for an actuation and a closure element provided in a bore of said housing, said closure element being adjustable in relation to said valve seat by means of the actuator, said closure element being a full sphere having a concentric waist portion the diameter of which being larger than the diameter of said valve seat but smaller than the inner guiding diameter of said cylinder bushing, which guiding diameter of said cylinder bushing being smaller than the diameter of said full sphere, such that said closure element can be inserted into or removed from said cylinder bushing from the out side of said housing.

Abstract: In a hydraulic control device for the direction control of at least one highest hydraulic pressure hydro-motor with working pressures above about 400 bar from a pressure source the hydro-motor is connectable via at least one consumer line and two leakage-free black/white directional seated valves selectively with said pressure source or a return line, within in said consumer line a load holding blocking valve is provided in leakage-free seated valve design and where in-between said pressure source and said return line a 2/2 idling or shunting directional seated valve having a hydraulic actuation is provided which in its blocking position is leakage-free from the pressure source towards said return line and in each switching position is leakage-free between said hydraulic actuation and said return line, and wherein said hydraulic actuation of said idling directional seated valve between said load holding blocking valve and one of said directional seated valves is connected with said consumer line.