R900937870 2FRE6B-2X/25QK4MV German Rexroth hydraulic speed control valve

Frequently Asked Questions (FAQ)

Q1: What is the key advantage of the 2FRE valve over a standard throttle valve?

A:​ The 2FRE features built-in pressure compensation. This means it maintains a constant flow rate even if the system pressure (load) changes, ensuring consistent actuator speed. A standard throttle valve's flow would vary with pressure.

Q2: What does the "25Q" in the model number indicate?

A:​ 25​ is the rated flow capacity​ (25 L/min). Q​ denotes a progressive flow characteristic, providing finer resolution and easier control at lower flow rates.

Q3: Does this valve allow free flow in the reverse direction?

A:​ No.​ The suffix "M"​ indicates there is no integrated check valve. Flow is controlled from A→B, and flow from B→A is blocked. If bidirectional flow is needed, a different variant (e.g., with suffix "V") must be selected.

Q4: What external equipment is needed to operate this valve?

A:​ This valve requires an external proportional amplifier​ (e.g., Rexroth VT-VRPA1 series). The amplifier provides the 24V DC power to the solenoid and processes the command signal (e.g., 0-10V) and the valve's position feedback.

Q5: How is the flow direction configured?

A:​ Flow is controlled in the direction from port A to port B​ (A→B). The valve's subplate or label will have a marked arrow indicating this direction. It cannot be reversed internally.