Abstract: A hydraulic valve (3) includes an actuation device (1, 1 a, 1 b) for a control piston (2). The valve (3) is simple, robust, and insensitive to dirt. The is an actuation device (1, 1 a, 1 b) has a flexurally rigid metal plate (5), with an outer region fixed to the housing (4) in a stationary manner. A piezoelectric actuator (6) can bend a central region of the metal plate (5); and a pressure chamber (7) is filled with a pressurized liquid during operation. The pressure chamber (7) is delimited by the housing (4), the metal plate (5), and the control piston (2). The metal plate (5) seals the pressure chamber (7), and the pressure chamber (7) acts on the control piston (2). A surface area AP of the metal plate (5) over the pressure chamber (7) is larger than the cross-sectional area AK of the control piston (2).

Abstract: A method for determining the ferrite phase fraction xa after heating or when cooling a steel strip (2) in a metallurgic system. Also, a device for carrying out the method.

Abstract: A hydraulic valve (3) includes an actuation device (1, la, lb) for a control piston (2). The valve (3) is simple, robust, and insensitive to dirt. The is an actuation device (1, 1a, 1b) has a flexurally rigid metal plate (5), with an outer region fixed to the housing (4) in a stationary manner. A piezoelectric actuator (6) can bend a central region of the metal plate (5); and a pressure chamber (7) is filled with a pressurized liquid during operation. The pressure chamber (7) is delimited by the housing (4), the metal plate (5), and the control piston (2). The metal plate (5) seals the pressure chamber (7), and the pressure chamber (7) acts on the control piston (2). A surface area AP of the metal plate (5) over the pressure chamber (7) is larger than the cross-sectional area AK of the control piston (2).

Abstract: A fire-fighting device includes an extinguishing device arranged on an end region of a cantilever arm and is adjustable in at least one spatial direction. A penetration fixture is adjustable relative to the extinguishing device and has a double-acting pressure cylinder subjectable to pressure by a pressure medium from a hydraulic system via at least one control valve. The cylinder has a tubular continuous piston rod having a penetration tool on a protruding end having a through-hole and a nozzle head. At another end, the piston rod is connected in line with a supply mechanism for an extinguishing medium. Pressure accumulator elements are in fluid communication with a pressure chamber of the pressure cylinder for extending the penetration tool and with a return line for the pressure medium from another pressure chamber for retracting the penetration tool.

Abstract: A method for determining the ferrite phase fraction xa after heating or when cooling a steel strip (2) in a metallurgic system. Also, a device for carrying out the method.

Abstract: A fire-fighting device includes an extinguishing device arranged on an end region of a cantilever arm and is adjustable in at least one spatial direction. A penetration fixture is adjustable relative to the extinguishing device and has a double-acting pressure cylinder subjectable to pressure by a pressure medium from a hydraulic system via at least one control valve. The cylinder has a tubular continuous piston rod having a penetration tool on a protruding end having a through-hole and a nozzle head. At another end, the piston rod is connected in line with a supply mechanism for an extinguishing medium. Pressure accumulator elements are in fluid communication with a pressure chamber of the pressure cylinder for extending the penetration tool and with a return line for the pressure medium from another pressure chamber for retracting the penetration tool.

Abstract: A fire-fighting device includes an extinguishing device arranged on an end region of a cantilever arm and is adjustable in at least one spatial direction. A penetration fixture is adjustable relative to the extinguishing device and has a double-acting pressure cylinder subjectable to pressure by a pressure medium from a hydraulic system via at least one control valve. The cylinder has a tubular continuous piston rod having a penetration tool on a protruding end having a through-hole and a nozzle head. At another end, the piston rod is connected in line with a supply mechanism for an extinguishing medium. Pressure accumulator elements are in fluid communication with a pressure chamber of the pressure cylinder for extending the penetration tool and with a return line for the pressure medium from another pressure chamber for retracting the penetration tool.

Abstract: The invention discloses a device for use in fire-fighting operations and a penetration device of the device for use in firefighting, comprising an extinguishing device (1) arranged on an end region (2) of a cantilever arm (3) of a device for use in fire-fighting operations and adjustable in at least one spatial direction, and a penetration fixture (8) that is adjustable relative to the extinguishing device (1) and has a double-acting pressure cylinder (35) that can be subjected to pressure by a pressure medium from a hydraulic system (34) via at least one control valve, the cylinder having a tubular continuous piston rod (36). The rod has a penetration tool (9) on a protruding end (14) having a through-hole and a nozzle head (15). At another end (38), the piston rod (36) is connected in line with a supply mechanism for an extinguishing medium.