Primetals Technologies Austria Gmbh

Rosenbauer International Ag

Josef Mikota

Johann Wieser

Bernd Linzer

Axel Rimnac

Rainer Burger

Robert Linsbod

Gudrun Mikota

Stefan Josef Wagner

Rudolf Aichinger

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

Piezoelectrically actuated quick-action hydraulic valve

A method for determining the ferrite phase fraction xafter heating or when cooling a steel strip () in a metallurgic system. Also, a device for carrying out the method. A method by which the ferrite phase fraction in the steel strip () can be determined online, quickly and easily, includes measuring a width wand a temperature Tof the steel strip (), wherein the steel strip () comprises a ferrite phase fraction xduring the measurements; heating or cooling the steel strip (); when heating the steel strip () a phase conversion at least in part occurs, a&#x2192;y from the ferrite state a into the austenitic state y and when cooling the steel strip a phase conversion at least in part occurs, from the austenitic state y into the ferrite state a; measuring of a width w and a temperature T of steel strip () converted at least in part; determining the ferrite phase fraction of the formula (I), wherein Tis a reference temperature and aand aare the linear heat expansion coefficients of ferrite and austenite.

Determining the ferrite phase fraction after heating or cooling of a steel strip

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.

Device for use in fire-fighting operations

Growing community of inventors

Gallneukirchen, Austria

Josef Mikota