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Pressure control valves

The present invention relates to a pressure control valve, in particular for electrohydraulic brake systems, including a valve member arranged in a valve housing and a sensor element for determining the fluid pressure that prevails in the valve housing. The fluid pressure in the valve housing is indirectly determined by the sensor element by way of the deformation of the valve housing.

FIG. 1 shows a simplified view of a pressure control valve which is arranged in a block-shaped valve-accommodating member and is especially suited for use in electrohydraulic brake systems. The pressure control valve accommodates in a valve housing a valve member which is adapted to close or open the pressure fluid channels disposed in the valve accommodating member by way of the electromagnetic actuation of a valve coil.

Further, a sensor element is arranged above the valve coil on the outside of the dome-shaped valve sleeve area. Sensor element is used to determine the fluid pressure which prevails in the Pressure control valves. According to the present invention, the fluid pressure in the valve housing is indirectly sensed by the sensor element by way of the measurement of the deformation of the valve housing. As regards the design of the sensor element , it becomes apparent from FIG. 1 that a wire strain gauge is fitted to the dome-shaped portion of the valve housing and, in conjunction with a gauge ring and reference ring that will be illustrated in the following in FIG. 2 , forms a measuring element which, by way of exciter ring , senses a signal representative of the deformation of the valve housing in the event of hydraulic pressure variation and transforms it into a pressure signal by way of an appropriate sensing, and evaluating circuit.

According to FIG. 1 , the signal-receiving and exciter assembly is mounted directly on a cover which also accommodates the controlling and/or regulating electronics that is required for the operation of the pressure control valve. Electronics is connected electrically and also mechanically by way of the electric contacts of the valve coil. Valve coil, the controlling and/or regulating electronics , and the signal-receiving and exciter assembly are thus combined to form a prefabricated assembly in the cover. Cover is seated on the valve-accommodating member that carries the pressure control valve . It can be seen in the drawing of FIG. 1 that the sensor element is isolated by an air gap from the signal-receiving and exciter assembly so that a non-contact signal transmission occurs between a measuring element, that is integrated in the sensor element and fitted to the pressure control valve , and the signal-receiving and exciter assembly in which the sensor signal characterizing the valve housing Pressure relief valves deformation is transformed into a pressure signal. Therefore, it is proposed for the operation of the sensor element that the signal-receiving and exciter assembly causes induction of an electric voltage in a receiving circuit integrated in the sensor element , the said voltage permitting the operation of the measuring element associated with the sensor element .

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• Direct operated spool valve

• Solenoid operated directional spool valve

• Electro-hydraulic operation valves

• Hydraulic directional control valve

• Manually directional valves

• Manually operational valve

• Solenoid operated directional poppet valve

• Pressure control valves

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