Abstract: A proportional hydraulic valve has a valve housing, an actuating device and a valve piston axially movable in a piston chamber of the valve housing. The valve housing has at least one pressure connection and at least one connection port. The valve piston blocks a flow path between the pressure connection and the connection port or releases it proportionally by moving the valve piston proportionally to an actuating force generated by the actuating device between a closed position and an open position. The valve piston has a first and a second spool area with a circumferential recess in the axial direction after the first and before the second spool area. The recess together with the piston chamber forms a pressure chamber and the pressure connection opens into the pressure chamber. A first diameter of the first spool area is larger than a second diameter of the second spool area.

Abstract: A proportional hydraulic valve has a valve housing, an actuating device and a valve piston axially movable in a piston chamber of the valve housing. The valve housing has at least one pressure connection and at least one connection port. The valve piston blocks a flow path between the pressure connection and the connection port or releases it proportionally by moving the valve piston proportionally to an actuating force generated by the actuating device between a closed position and an open position. The valve piston has a first and a second spool area with a circumferential recess in the axial direction after the first and before the second spool area. The recess together with the piston chamber forms a pressure chamber and the pressure connection opens into the pressure chamber. A first diameter of the first spool area is larger than a second diameter of the second spool area.

Abstract: A system and a method for operating a hydraulic driven work machine including a hydraulic travel motor having a variable displacement is provided, wherein a flow of hydraulic fluid generated by a hydraulic pump is provided to the travel motor and wherein a control valve is provided for controlling the flow of hydraulic fluid from the hydraulic pump to the travel motor. The hydraulic pump is provided with a hydraulic control depending on a load signal generated by the travel control valve and the travel motor is provided with an electric control according to a desired driving behavior.

Abstract: A method is provided for actuating a brake light of a hydraulic driven working machine that includes equipment to detect the condition of travel including a travel speed sensor, a gear selector switch, a travel direction switch and a travel pedal pressure sensor. The equipment automatically activates a brake light via a control circuit depending on the selected gear if the machine decelerates without the brake pedal being pushed.

Abstract: A method is provided for actuating a brake light of a hydraulic driven working machine that includes equipment to detect the condition of travel including a travel speed sensor, a gear selector switch, a travel direction switch and a travel pedal pressure sensor. The equipment automatically activates a brake light via a control circuit depending on the selected gear if the machine decelerates without the brake pedal being pushed.

Abstract: A system and a method for operating a hydraulic driven work machine including a hydraulic travel motor having a variable displacement is provided, wherein a flow of hydraulic fluid generated by a hydraulic pump is provided to the travel motor and wherein a control valve is provided for controlling the flow of hydraulic fluid from the hydraulic pump to the travel motor. The hydraulic pump is provided with a hydraulic control depending on a load signal generated by the travel control valve and the travel motor is provided with an electric control according to a desired driving behaviour.

Abstract: In a screw-in multi-way seat valve V comprising a screw-in housing 1, in which at least one sleeve 21 is positioned axially which sleeve 21 forms a valve seat 20, and a valve member 15 provided inside and having a seat surface 31 with a larger outer diameter than the inner diameter of the valve seat 20, the sleeve 21 is axially positioned in the screw-in housing 1 by a threaded connection 23 and at the same time is sealed by a press fit zone 24, the press fit zone 24 forming an anti-rotation protection for the threaded connection 23.

Abstract: In a screw-in multi-way seat valve V comprising a screw-in housing 1, in which at least one sleeve 21 is positioned axially which sleeve 21 forms a valve seat 20, and a valve member 15 provided inside and having a seat surface 31 with a larger outer diameter than the inner diameter of the valve seat 20, the sleeve 21 is axially positioned in the screw-in housing 1 by a threaded connection 23 and at the same time is sealed by a press fit zone 24, the press fit zone 24 forming an anti-rotation protection for the threaded connection 23.

Abstract: To couple two pipes for hot fluids together, a sealing membrane of temperature and corrosion-resistant material is located transversely within a ring-shaped chamber or space surrounding the end portions of the pipes, the sealing membrane being welded to the adjacent wall portions defining the ring chamber, and the at least one and preferably two sealing and support cushions or pillows being placed adjacent the sealing membrane, to permit limited angular and axial movement of the pipe ends with respect to each other while, effectively, preventing substantial torsional excursion. The membrane may be corrugated or stepped, located transversely to the pipes or at an inclination with respect thereto. Two membranes may be used, inclined towards each other (FIG. 3) and multi-pipe units can be coupled by a single membrane (FIGS. 8, 9).

Abstract: To connect two pipes which may carry high-temperature potentially corrosive fluids, for example exhaust gases from an internal combustion engine, while permitting flexing of the pipes with respect to each other in torsion or twist, bending or lateral shift, while maintaining a sealed connection, a ring chamber is formed in the region of the pipe ends, by an overlapping pipe end portion of the like, an external sleeve, or overlapping flange construction, which retains therein a sealing and support pillow of ceramic or metal materials in form of fibers, filaments or the like, felted, matted, woven, knitted and compressed together; a metal sealing foil, for example of aluminum or specialty steel, crinkled or creased and preferably formed with expansion/contraction undulations, is located within the pillow.