4WRZ4WRZ / 4WRZE / 4WRH / 4WRHE / 4WRE / 4WRA Series
Proportional Directional Valves
Proportional directional valves, pilot-operated (4WRZ, 4WRH) and direct-acting (4WRE, 4WRA). Sizes 10, 16, 25 and 32, rated flow 50–800 l/min at ΔP=10 bar per edge, working pressure up to 35 MPa. Versions with electrical spool-position feedback (LVDT) — 4WRZE / 4WRHE / 4WRE — deliver ±1.5% linearity and ≤0.3% hysteresis. Integrated on-board electronics (OBE) or external amplifier. Used in servo-hydraulic test rigs, synchronous multi-cylinder drives, precise press positioning, rolling-mill stand control.
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