R900417545 DR20G5-4X/100YM German Rexroth hydraulic valve stacked pressure reducing valve

Frequently Asked Questions (FAQ) for Rexroth DR 20G5-4X/100YM (R900417545)

Q1: What is the primary function of this valve?

A:​ It is a three-port proportional pressure reducing valve. Its core function is to reduce the high pressure from the main hydraulic system and maintain a stable, adjustable lower working pressure in a secondary circuit, controlled by an electrical signal.

Q2: What does "100YM" in the model number mean?

A:

• 100:​ Indicates the maximum settable secondary reduced pressure​ is 100 bar.

• Y:​ Signifies the valve is actuated by a proportional solenoid.

• M:​ Denotes that this proportional solenoid has an integrated onboard electronics (OBE)​ plug, typically for PWM control signals.

Q3: What is its maximum flow rate?

A:​ Under standard conditions, its nominal flow rate is approximately 250 liters per minute. Actual flow is influenced by the working pressure drop and fluid viscosity. Precise data should be obtained from the flow vs. pressure drop curve in the official datasheet.

Q4: How is it installed in a system?

A:​ It is a sandwich-type valve. It is mounted onto an NG20 sized subplate​ (e.g., Rexroth RE 20 series) conforming to ISO 7368, and can be combined with other sandwich valves or cover plates to form a compact manifold stack.

Q5: What equipment is needed to control this valve?

A:​ A controller capable of providing a Pulse Width Modulation (PWM) signal​ is required, such as a PWM output module on a PLC or a dedicated proportional amplifier. The valve's integrated electronics simplify wiring. The typical supply voltage is 24V DC.

Q6: What are the P, A, B, T, and Y ports on the valve body?

A:

• Port P:​ Pressure supply port (connected to the system pump).

• Ports A, B:​ Controlled pressure outlet ports (connected to the actuator).

• Ports T, Y:​ Tank/return ports (connected to the reservoir).

Q7: In which typical machines or systems is it used?

A:​ It is widely used in hydraulic sub-circuits requiring precise, adjustable pressure control, such as:

• Auxiliary motion control​ on injection molding machines and presses (e.g., ejection, mold adjustment).

• Clamping and locking devices​ on machine tools.

• Tension control systems​ for winders and wire drawing machines.

• Providing a pilot pressure supply​ for other high-flow proportional valves.