R900915815 2FRE10-4X/50LBK4M Rexroth hydraulic proportional speed control valve

Frequently Asked Questions (FAQ)

Q1: What is the key difference between the 2FRE10 and smaller 2FRE6 valves?

A:​ The 2FRE10​ is a larger NG10​ size valve designed for higher flow applications​ (rated 50 L/min). It shares the same core technology (pressure compensation, electrical control) as the NG6 version but is physically larger and handles significantly more oil flow. It is typically used to control the speed of larger cylinders or hydraulic motors.

Q2: What does the "50L" in the model number indicate?

A:​ 50​ is the rated flow capacity​ (50 liters per minute). L​ denotes a linear flow characteristic, meaning the flow is directly proportional to the input command signal (e.g., 50% signal ≈ 25 L/min). This provides predictable and repeatable control.

Q3: Does this valve include an integrated check valve for free reverse flow?

A:​ No.​ The suffix "M"​ in the model code indicates that there is no integrated check valve. Flow is controlled from port A to port B, and flow in the reverse direction (B to A) is blocked. If free reverse flow is required, a variant with the suffix "V" must be selected.

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

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

Q5: What is the typical application for a valve of this size (NG10)?

A:​ The 2FRE10-4X/50LBK4M is commonly used in 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.