R900915814 2FRE16-4X/160LBK4M Rexroth Germany Proportional Hydraulic Valve

Frequently Asked Questions (FAQ)

Q1: What is the key difference between this 2FRE16-4X/160LBK4M and the 2FRE16-4X/100LBK4M?

A:​ The primary difference is the rated flow capacity. This model is rated for 160 L/min, making it suitable for applications requiring higher flow rates than the 100 L/min version. It shares the same NG16 size, pressure rating (315 bar), and core features (pressure compensation, linear characteristic).

Q2: Does this valve allow free flow in the reverse direction?

A:​ Yes.​ The "B"​ suffix in the model code indicates an integrated check valve. This allows oil to flow freely from port B to port A​ (reverse flow), reducing pressure drop and heat generation during the return stroke of a cylinder. Flow control (metering) only occurs from A→B.

Q3: What external equipment is needed to operate this valve?

A:​ This valve requires an external proportional amplifier​ (e.g., Rexroth VT-VRPA1-151-1X or VT-MRPA1 series). The valve itself contains the solenoid and position sensor; the amplifier provides 24V DC power, processes the command signal (e.g., 0-10V), and closes the position control loop for precise spool positioning.

Q4: What is the minimum pressure drop required for stable operation?

A:​ A minimum pressure differential of approximately 6 to 10 bar​ across the valve (inlet to outlet) is typically required for the pressure compensator to function correctly and maintain stable, accurate flow control.

Q5: In which applications is this high-flow valve commonly used?

A:​ The 2FRE16-4X/160LBK4M is designed for heavy-duty industrial machinery requiring precise, high-flow speed control, such as:

• Large Presses:​ Controlling the approach and pressing speed.

• Injection Molding Machines:​ Metering the injection unit speed.

• Steel & Foundry Equipment:​ Regulating the movement of large actuators.

• Test Rigs:​ Providing variable flow to large cylinders.