Abstract: The invention discloses methods for the production of pressure pipes of a tractive solenoid for a hydraulic valve and pressure pipes that are manufactured using these methods, wherein the pressure pipes are thermally joined.

Abstract: The invention discloses methods for the production of pressure pipes of a tractive solenoid for a hydraulic valve and pressure pipes that are manufactured using these methods, wherein the pressure pipes are thermally joined.

Abstract: An electromagnet (10) for actuating a hydraulic on-off valve (11), has a wet-type configuration and its armature (31) is displaced in a pressure pipe (18) when a volume of oil is switched through a throttling site (35) in such a way that switching speed can be influenced. The electromagnet (10) has a manual emergency actuation device (43) in the pressure pipe (18). If necessary, the actuating bolts (44) of said device can be engaged with a throttle screw (39) by an interlocking connection (45, 42) in order to displace said throttle screw that is arranged in the armature (31). The switching speed of the distributing valve (11) can be easily regulated from the outside when the electromagnets (10) are mounted, without impairing functioning of the manual emergency actuation device.

Abstract: The invention relates to an electromagnet (10) for actuating a hydraulic on-off valve (11), having a wet-type configuration and whose armature (31) is displaced in a pressure pipe (18) when a volume of oil is switched through a throttling site (35) in such a way that switching speed can be influenced. The electromagnet (10) has a manual emergency actuation device (43) in the pressure pipe (18). If necessary, the actuating bolts (44) of said device can be engaged with a throttle screw (39) by means of an interlocking connection (45, 42) in order to displace said throttle screw that is arranged in the armature (31). The switching speed of the distributing valve (11) can be easily regulated from the outside when the electromagnets (10) are mounted, without impairing functioning of the manual emergency actuation device.

Abstract: An electromagnetically actuated directional control valve is proposed, whose control slide (18) can be switched against a restoring spring system (45) into three switching positions (39, 41, 42) by a double-lift magnet (12). The spring system (45) has a strong spring (31) and a counter-acting weak spring (37), which are disposed on both sides of the control slide (18). With a pushing magnet (12), the control slide (18) is solely deflected against the weak spring (37), which is supported on it over the entire lift area. With a pulling magnet (12), a spring plate (32), which centers the center position (39), is pulled way from the control slide (18), which now is displaced by the weak spring (37), against the force of the strong spring (31). The tappet (29), connected with the armature, and the control slide (18) are separate independent components, which only form a frictionally connected operative connection.

Abstract: A hydraulic control system has a three-position valve which in its central position disconnects the high-pressure and low-pressure sides of a pressure source from outlet lines but connects these sides of the source together through a low-pressure valve. Moved to either of its end positions the valve is disconnected from between the sides of the pressure source and the output lines are connected to the high-pressure and low-pressure source sides. A pressure-limiting valve is connected between the sides of the source. In addition, the high-pressure side is connected via pressure-reducing valve and a restriction to a pair of pilot valves which are in turn connected to the low-pressure side. These pilot valves are also connected to opposite chambers of a pilot cylinder that controls the valve body. The pressure-reducing valve between the pilot valves and the high-pressure side maintains a medium-pressure level in the system when the valves move from its central position.