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Hydraulic Valve

Hydraulic Valve

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LVDT Drive Motor Drive Position Sense Pressure Sense Signal Isolator CAN Transceiver LVDT Drive & Analog Supply LDO/SVS Motor Supply Drive Valve Controller & Conditioner (DSP) Temp Sensor

Design Considerations

Hydraulic Valve

A hydraulic valve directs the flow of a liquid medium, usually oil, from its input ports to its output ports. The direction of the oil flow is determined by the position of a spool, which is driven by a linear force motor:

The core subsystems include:

  • Power Conversion
    - provides galvanic isolation between valve power, external fieldbus, and auxiliary 24V supplies. It also provides regulated supply voltages to the individual functional blocks.

  • Fieldbus Interface & Control
    - provides galvanic isolation between the system controller and the fieldbus signals. The system controller translates the incoming data from the fieldbus into valve commands for the DSP. It also translates the valve data from the DSP to Fieldbus signals.

  • Valve Control
    - performs spool positioning, and pressure & temperature measurement. It also indicates alarm conditions.

The valve controller receives a position-command from the fieldbus via the system controller and drives the linear force motor until the output signal of the position sensor (LVDT=Linear Variable Differential Transformer) equals the input value of the position command. At the same time, pressure and temperature are monitored. An alarm condition is indicated, if one of these sensors exceeds a pre-determined safety-value.

Application Notes

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