Rexroth Directional Control Valves

Rexroth hydraulic valve with electrical position feedback
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Description:

The Rexroth directional control valves with electrical position feedback and integrated electronics (OBE) are high‑performance servo/proportional valves designed for precise, closed‑loop control of hydraulic actuators. By continuously comparing the commanded signal with the actual spool position (via built‑in transducers), these valves deliver accurate control over position, flow rate, velocity or pressure. With robust construction, responsive dynamics, and safety‑oriented fail‑safe behaviour when unpowered, they are ideal for demanding industrial, automation and mobile‑hydraulic applications.

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Advantages of the Rexroth directional control valves

  • High-precision closed-loop control: Thanks to built-in electrical feedback and integrated electronics, spool position is continuously monitored — delivering accurate and repeatable control over flow, velocity, force or position.

  • Fast response & stability: Servo-quality spool and sleeve, along with optimized control electronics, enable high response sensitivity, low hysteresis, and minimal drift — crucial for dynamic industrial or automation applications.

  • Safety & fail‑safe behavior: On power‑off or signal loss, the valve automatically returns spool to a safe central (or defined offset) position, preventing unintended actuator movement.

  • Flexible integration and standard mounting: Subplate mounting per ISO 4401 and standard interfaces simplify integration with hydraulic systems.

  • Versatile application range: Suitable for a variety of uses — from small-scale direct-operated valves (low flow) to large pilot-operated valves (high flow), covering hydraulic force, velocity, position, and pressure control across many industries.

  • Reliable and robust design: Manufactured to servo-quality standards with integrated electronics, ensuring stable operation, durability and long service intervals under demanding conditions.

Parameter Specification / Details
Valve Type / Series Servo / Proportional Directional Valves with Electrical Position Feedback (e.g. 4WRPEH, 4WREE / 4WRLE, 4WRVE)
Manufacturer Bosch Rexroth
Operating Principle Direct‑operated or pilot‑operated directional spool valve, with integrated electronics (OBE) and position transducer feedback
Operating Pressure (Ports P, A, B) Up to 315–350 bar (depending on size and series)
Port Pattern / Mounting Subplate mounting conforming to ISO 4401 standard porting pattern
Nominal Flow Range Typical flow rates vary — e.g.: direct‑operated small valves: ≈ 2…40 l/min (size 6) at Δp = 70 bar. For larger / pilot‑operated valves: flows up to several hundreds l/min depending on valve size/size class.
Control / Feedback Integrated electronics (OBE) compare command value with actual spool position; spool adjusted by solenoid vs. spring to correct deviations. Fail‑safe spool return when deactivated.
Signal Interface (typical) Analog input — e.g. ±10 V differential amplifier (interface A1), or 4–20 mA (interface F1) depending on variant.
Hysteresis / Sensitivity / Precision Very low hysteresis; high response sensitivity; temperature drift and zero‑point deviations tightly controlled. E.g. for some pilot‑operated valves: hysteresis < 0.1%; response sensitivity < 0.05%
Fail‑Safe Behaviour When electronics/power is off or signal lost — spool returns to safe center (or defined safe offset) position via spring mechanism.
Typical Applications Hydraulic systems requiring precise control: position control, velocity control, pressure/force control, automation, test benches, mobile hydraulics, industrial machinery.
Mounting / Installation Subplate mounting according to ISO 4401; valve body / spool in “servo quality”; can be used in any installation orientation (depending on model).
Electrical Supply Nominal 24 V DC (often), duty cycle 100 %, with required fuse protection.