I. Product Overview
TheDBEE6-1Xis apilot-operated proportional relief valvemanufactured by Bosch Rexroth, a high-precision pressure control component in industrial hydraulics. Its core function is to continuously regulate system pressure via electrical signals (0-10V or 4-20mA), enablingproportional pressure control. It is suitable for dynamic pressure adjustment applications such as hydraulic test benches, injection molding machines, and construction machinery.
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II. Technical Specifications
• Nominal Size: NG6 (6mm port diameter)
• Device Series: 1X (standardized mounting and connection dimensions compliant with ISO 4401-03-02-0-94)
• Maximum Operating Pressure:
• P port (inlet): 315 bar
• T port (return): 250 bar
• Maximum Flow Rate: 40 L/min
• Power Supply Voltage: 24V DC (G24)
• Solenoid Type:
• Maximum current: 0.8A or 2.5A (distinguished by suffixes like-8NZ4Mor-25NZ4M)
• Seal Material: NBR (nitrile butadiene rubber), compatible with mineral oils (HL/HLP per DIN 51524)
• Electrical Connector: DIN 43650-AM2 standard plug (Z4)
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III. Core Functions and Features
1. Proportional Control:
• Linearly adjusts valve opening via input electrical signals (voltage or current) for continuous pressure regulation.
• Solenoid current is proportional to pressure: higher current = higher system pressure.
2. Pilot-Operated Design:
• The main valve spool is controlled by a pilot valve, utilizing system pressure as driving force for stable regulation under high pressure and large flow.
• Reduces spring load in the pilot valve, enabling lighter pressure adjustment but slightly slower response compared to direct-acting valves.
3. Safety Protection:
• In case of electronic control unit failure (e.g., coil current exceeds rated Imax), the valve mechanically limits system pressure to a safe level.
4. Mounting and Compatibility:
• Subplate mounting design with ISO 4401-compliant mounting holes for direct replacement of equivalent valves.
• Supports external electronic control units (ordered separately) with ramp functions (smooth pressure transitions) and valve tuning capabilities.
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IV. Applications
1. Hydraulic System Pressure Control:
• Limits maximum system pressure to prevent overload damage.
• Enables precise control in dynamic pressure adjustment scenarios (e.g., pressure testing, load simulation).
2. Industrial Automation Equipment:
• Injection molding machines: Controls injection pressure for optimized molding quality.
• Construction machinery: Adjusts hydraulic cylinder output force for varying operating conditions.
3. Agricultural and Environmental Equipment:
• Variable-rate spraying systems: Regulates pressure to control spray flow for precise pesticide/fertilizer application (e.g., DBEE6-1X/50 used in PWM intermittent spraying systems with flow control error <±4%).
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V. Selection and Ordering Guide
• Model Naming Convention:
DBEE6 - 1X / [Pressure Rating]G24 - [Current]NZ4M
• Example:DBEE6-1X/315G24-25NZ4M
• 315: Maximum pressure 315 bar
• 25: Solenoid maximum current 2.5A
• Optional Accessories:
• External electronic control units (plugs, modules, Eurocard inserts supporting 0-10V or 4-20mA signals).
• Mounting subplates (ordered separately per ISO 4401 standards).
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VI. Maintenance and Precautions
1. Regular Inspections:
• Clean valve ports and filters to prevent debris from jamming the spool.
• Check electrical connector sealing to avoid moisture or dust ingress.
2. Operating Limits:
• Avoid prolonged full-load operation to prevent coil overheating.
• Ensure stable power supply to avoid control signal interference.
3. Troubleshooting:
• Unstable pressure: Check for pilot valve blockage or solenoid coil damage.
• Inability to adjust pressure: Verify electronic control unit signal output.
