Rexroth Proportional Directional Valve with Threaded Installation 280 bar Pressure and ISO 4401 Mounting Interface

These valves are used in various industrial hydraulic systems requiring precise control, such as:

• Plastic injection molding machines
• Presses and bending machines
• Mobile equipment
• Industrial automation systems where proportional control of speed and direction is needed

Common problems and their potential causes include:

• Valve does not shift or responds slowly: Check solenoid coil for burnout or open circuit; check power supply voltage; check for contamination causing the spool to stick
• Internal Leakage: Worn spool or seals, or contamination causing improper sealing
• Valve sticking: Often due to inadequate fluid cleanliness, insufficient lubrication, or internal damage
• Excessive noise: Can be caused by excessive vibration, voltage fluctuations, or issues with the solenoid
• No function despite signal: Check the amplifier (for 4WRA), wiring, and connections between the control unit and the valve

• Regularly check the solenoid coils and valve spool for wear
• Maintain fluid cleanliness to prevent contamination, which is a primary cause of valve failure. Ensure the filtration system is functioning properly
• Periodically inspect electrical connections and seals