3-Way Proportional Pressure Reducing Valve 3DREP6C-1X Detailed Introduction
I. Product Overview
The3DREP6C-1Xis a direct-acting three-port proportional pressure-reducing valve manufactured by companies such as Bosch Rexroth or Hengli Hydraulics. It directly drives the valve spool via a proportional solenoid, converting input electrical signals into proportional pressure output signals for continuous system pressure regulation and flow direction control. Its compact design supports subplate mounting and complies with ISO 4401 standards.
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II. Technical Specifications
1. Port Size and Pressure Ratings
• Port Size: 6 mm
• Pressure Ratings: 16 bar, 25 bar, 45 bar (distinguished by model suffixes, e.g.,3DREP6C-2X/16EG24N9K4/Mfor 16 bar)
• Maximum Operating Pressures:
• Port P:
• 20–100 bar (Pressure Rating 16)
• 30–100 bar (Pressure Rating 25)
• 50–100 bar (Pressure Rating 45)
• Port T: 0–30 bar
2. Flow Characteristics
• Maximum Flow Rate: 15 L/min (at Δp = 50 bar)
• Flow Profile: Progressive throttling orifice with proportional pressure-flow relationship.
3. Electrical Parameters
• Control Method: Proportional solenoid drive, supporting voltage input (±10 V) or current input (4–20 mA).
• Power Supply: DC 24 V (rated voltage: 19–35 V).
• Solenoid Coil:
• Cold resistance (20°C): 4.8 Ω
• Hot resistance (max.): 7.2 Ω
• Maximum current: 1.5–2.5 A (model-dependent)
• Duty cycle: 100%
• Maximum coil temperature: 150°C
4. Environmental and Media Compatibility
• Operating Temperature Range:
• Ambient: -20°C to +70°C (standard)
• Fluid: -20°C to +80°C
• Compatible Media: Mineral oils (HL, HLP per DIN 51524); consult supplier for other media.
• Fluid Viscosity: 20–380 mm²/s (preferred: 40–60 mm²/s).
• Contamination Level: NAS 1638 Class 9 or ISO 4406 20/18/15.
5. Construction and Materials
• Seal Material: NBR (Nitrile Butadiene Rubber) or FKM (Viton, for phosphate ester oils).
• Valve Body Material: Cast iron (stainless steel for select models).
• Mounting: Subplate mounting (horizontal preferred).
• Weight: Approx. 2.0–2.2 kg.
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III. Functions and Operation
1. Pressure Regulation
• The valve spool position is controlled by the proportional solenoid’s current, enabling pressure adjustment atPort B.
• Pressure is proportional to current (e.g., when solenoid "a" is energized, the P→B channel opens, and B-port pressure increases with current).
2. Flow Direction Control
• Three-port design (P, A, B, T) allows both pressure regulation and flow switching.
• When solenoids are de-energized, the spool returns to center via springs, connecting A/B to T for fluid return to the tank.
3. Manual Override (Optional)
• Select models (e.g., N9 code) support manual spool movement during solenoid de-energization.
4. Integrated Electronics (OBE)
• Models like3DREPEintegrate control electronics for low-tolerance command/pressure curves.
• Adjustable pressure build/release ramp times via potentiometer.
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IV. Model Code Breakdown
Example:3DREP6C-2X/25EG24N9K4/M
• 3DREP: Direct-acting three-port proportional pressure-reducing valve.
• 6C: 6 mm port size, Series 2X (unchanged mounting dimensions).
• 25: 25 bar pressure rating.
• E: Integrated control electronics (OBE).
• G24: DC 24 V power supply.
• N9: Protected manual override.
• K4: External wiring control with component plug (no socket).
• M: NBR seals.
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V. Applications
1. Metallurgy: Hydraulic system pressure control in blast furnaces and converters.
2. Petrochemical: Pressure regulation in reactors and compressors.
3. Hydraulic Test Benches: Stable test pressure generation.
4. Construction Machinery: Adjustable hydraulic cylinder force in excavators and loaders.
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VI. Advantages
1. High Precision: Linear pressure-current relationship with ≤1% repeatability and ≤5% hysteresis.
2. Fast Response: Sensitivity ≤0.5%, ideal for dynamic pressure control.
3. Flexible Configuration: Supports external or integrated electronics for diverse applications.
4. Easy Maintenance: Modular design with replaceable spools and solenoids.
