Replacement rexroth Hydraulic Proportional Valve

Replacement rexroth Hydraulic Proportional Valve

4 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 3 year year

Product details

1.1 Verify Original Valve Model and Specifications

• Model Identification: Obtain the model number from the valve nameplate or technical documentation (e.g.,4WRPEH6C3B40L-2X/M/24).

• Key Parameters:

• Rated Pressure(e.g., 350 bar)

• Maximum Flow Rate(e.g., 40 L/min)

• Control Method(electro-hydraulic proportional, PWM signal, etc.)

• Port Sizes(e.g., G1/2, M22×1.5)

• Electrical Interface(e.g., DIN 43650 plug, M12 connector)

1.2 Select a Replacement Valve

• Direct Replacement: Choose the same Rexroth series model (e.g., a newer version of4WRPEH6C3B40L-2X/M/24).

• Cross-Series Replacement: If the original model is discontinued, match a functionally equivalent model:

• Original:4WRPEH(with integrated electronics) → Replacement:4WRPEH(new version) or4WRDEH(with digital electronics).

• For higher precision, upgrade to4WRPH(high-performance proportional valve).

• Third-Party Compatible Valves: Some brands (e.g., Parker, Moog) offer Rexroth-compatible valves. Confirm electrical protocols (e.g., CANopen, PWM) and mechanical dimensions match.

1.3 Verify Compatibility

• Mechanical Fit: Check installation dimensions, thread interfaces, and port locations against the original system.

• Electrical Compatibility: Ensure control signal type (voltage/current control, PWM frequency) and feedback signals (if any) align with the controller.

• Performance Matching: Confirm the replacement valve’s flow-pressure curve and response time meet system requirements.

2. Technical Parameter Comparison Example

【表格】

Parameter Original Valve (4WRPEH6C3B40L-2X/M/24) Replacement Valve (4WRDEH6C3B40L-2X/M/24)

Rated Pressure 350 bar 350 bar

Max Flow Rate 40 L/min 40 L/min

Control Method Current control (0–2A) Current control (0–2A)

Feedback Type None Optional position feedback (LVDT)

Electrical Interface DIN 43650 M12 connector

Response Time ≤50 ms ≤40 ms

3. Installation and Commissioning Guidelines

3.1 Mechanical Installation

• Clean the System: Flush hydraulic lines thoroughly before replacement to prevent contaminants from entering the new valve.

• Align Ports: Ensure the new valve’s P, T, A, and B ports match the original system piping.

• Torque Specifications: Tighten bolts to Rexroth standards (e.g., M6 bolts: 10–12 Nm).

3.2 Electrical Connection

• Signal Matching: If the original valve uses voltage control (0–10V), the replacement must support the same range. For current control (4–20mA), adjust the controller output.

• Shielding: Ground shielded signal cables over long distances to avoid electromagnetic interference.

3.3 Commissioning Steps

1. Zero Calibration: Set the proportional valve’s zero position (spool position at no signal) via the controller.

2. Gain Adjustment: Gradually increase the input signal while observing system response. Tune the controller’s PID parameters.

3. Functional Testing: Run the system to verify stable pressure/flow with no oscillation or sticking.

4. Common Issues and Solutions

4.1 Valve Does Not Actuate

• Causes: No electrical signal, solenoid failure, or stuck spool.

• Solutions: Check signal wiring, measure solenoid resistance (typically 8–15Ω), and clean the spool.

4.2 Slow Response

• Causes: Low signal frequency, high oil viscosity, or internal leakage.

• Solutions: Increase PWM frequency (e.g., from 200Hz to 500Hz), use lower-viscosity oil, and inspect spool seals.

4.3 Excessive Heat

• Causes: Continuous high-pressure/low-flow operation or excessive valve port pressure drop.

• Solutions: Optimize system design (e.g., add a pressure-reducing valve) or select a pressure-compensated proportional valve.

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 Audited supplier

3 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump, hydraulic valve , hydraulic winch , hydraulic system

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