R900596339 DR30-5-5X/100Y Rexroth hydraulic valve pressure reducing valve Germany

Frequently Asked Questions (FAQ) for Rexroth DR 30-5-5X/100Y (R900596339)

Q1: What is the main difference between the "100Y" and a "100YM" model?

A:​ The critical difference is the solenoid type and control signal.​ The "Y"​ variant uses a proportional solenoid that requires an external analog amplifier​ to provide a current signal (e.g., 0-20 mA or ±10V). The "YM"​ variant includes On-Board Electronics (OBE)​ and accepts a direct PWM (Pulse Width Modulation) signal, simplifying the wiring.

Q2: What is the NG30 size, and how does it compare to NG20?

A:​ NG30​ is the Nominal Size 30, one standard size larger than NG20. It features larger flow passages and ports, designed for higher flow systems. Compared to an NG20 valve (~250 l/min), an NG30 valve like this one typically handles flows of approximately 400 liters per minute or more, depending on the pressure drop.

Q3: Why is the reduced pressure only 100 bar on this large valve?

A:​ A 100 bar reduced pressure on a high-flow valve is typically used for applications requiring precise control of a high-flow, medium-pressure circuit. Common applications include:

• High-flow pilot supplies​ for very large directional or flow control valves.

• Pressure control in large clamping or tensioning systems​ (e.g., in rolling mills or large presses).

• Circuits where high flow is needed, but the required force is moderate, allowing for smaller, more efficient pumps.

Q4: How do I control this "Y" version valve?

A:​ You will need an external proportional amplifier​ (e.g., a Rexroth VT- or VT-SRCI type amplifier). The amplifier converts a standard command signal (like 0-10V from a PLC) into the required regulated current to drive the solenoid. The valve itself has a simple solenoid coil without built-in control electronics.

Q5: How is it installed? Is the mounting the same as NG20?

A:​ The principle is the same (sandwich mounting), but the interface is larger. It mounts between a NG30-sized subplate​ (e.g., Rexroth RE 30 series) and another NG30 valve or cover plate. The bolt pattern, port sizes, and overall dimensions are all to the NG30 (ISO 7368) standard.

Q6: What is the maximum flow rate?

A:​ The nominal flow is typically around 400 l/min, but the exact value depends on the permissible pressure drop. For system design, it is crucial to consult the official performance curves (Q vs. Δp charts)​ in the datasheet (RE 29075) for the exact model.

Q7: What do the ports P, A, B, and T connect to?

A:

• P (Pressure):​ Connects to the system's main pressure line.

• A, B (Outlet):​ Deliver the controlled, reduced pressure to the actuator (cylinder or motor).

• T (Tank):​ Returns internal leakage and control flow back to the reservoir.

Q8: Can this valve handle a system pressure of 315 bar?

A: Yes.​ The valve body, all fluid ports, and seals are rated for the maximum working pressure of 315 bar. The "100 bar" rating applies only to the maximum pressure it is designed to reduce and control at the A/B outlets.

Q9: Where can I find detailed technical drawings and specifications?

A:​ For integration, you must obtain the official Rexroth documentation. The primary datasheet is RE 29075. Request the specific dimensional drawing and data sheet​ for order code R900596339​ or model DR 30-5-5X/100Y​ from your Rexroth distributor or the official website.