spool hydraulic directional control valve / direct-operated / 3-way / proportional
STW 0195, STW 0196

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Characteristics

  • Type:

    spool

  • Actuating method:

    direct-operated

  • Ports/positions:

    3-way

  • Other characteristics:

    proportional

  • Flow rate:

    Max.: 65 l/min (17 us gal/min)

    Min.: 10 l/min (3 us gal/min)

  • Operating pressure:

    250 bar (3,626 psi)

Description

Proportional directional valves, direct operated, with pQ functionality
STW 0195, STW 0196

Set-up
The IAC-P valve basically consists of:

Housing (1) with connection surface ‐
Control spool (2) with compression spring (3) ‐
Solenoid and pole tube (4) with central thread ‐
Position transducer (5) ‐
Pressure sensor (6) ‐
Integrated digital control electronics IAC-P (7) with bus connection (X2) and central connector (X1). ‐

Functional description
If solenoids (4) are not operated, spool position A → T (with version "0196-1X/1" additionally B → T) ‐
Functions: ‐
Flow control (Q) •
Pressure control (p) •
Substitutional control p/Q •
The command value presetting can alternatively be specified via an analog interface (X1) or via the field bus interface (X2, X3). ‐
The actual value signals are provided via an analog interface (X1) and can additionally be read out via the field bus (X2, X3). ‐
The controller parameters are set via the field bus (X2, X3). ‐
Separate supply voltage for bus/controller and power part (output stage) for safety reasons ‐

The digital integrated control electronics enables the following error detection (diagnosis):

Cable break of pressure sensor supply line (6) ‐
Undervoltage ‐
Cable break position transducer (5) ‐
Communication error ‐
Watchdog ‐
Cable break of command value inputs