Guangdong Yanhui Hydraulic Co., Ltd. is one of the leading manufacturers and suppliers of Rexroth Proportional Relief Valve in China. We warmly welcome you to wholesale bulk Rexroth Proportional Relief Valve for sale here from our factory. If you have any enquiry about pricelist and quotation, please feel free to email us.
Product Overview
▔▔The Rexroth Proportional Pressure Relief Valve (DBETX / DBEM / DBEE Series) is a high-performance, electro-hydraulically operated valve engineered for precise, stepless hydraulic pressure control in demanding industrial systems. Functioning as a remote control unit or main relief stage, this series dynamically regulates system pressure in proportion to an electrical command signal (current or voltage).
Key Advantages
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- Precision Electro-Proportional Control: Delivers rapid, highly linear pressure adjustment with minimal hysteresis, ensuring stable system pressure under dynamic load fluctuations.
- Robust & Heavy-Duty Design: Built to withstand high-pressure spikes and continuous duty in harsh industrial environments.
- Integrated or External Amplifiers: Compatible with standard Eurocard amplifiers or modern integrated electronics (OBE) for plug-and-play installation.
- High Dynamic Response: Optimized internal poppet/spool geometry minimizes response lag, preventing pressure overshoot in critical machinery.
Technical Specifications
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| Parameter | Specification / Performance Range | Notes / Test Conditions |
| Max. Operating Pressure (Port A, B, P) | Up to 315 bar / 350 bar | Series dependent (e.g., DBET / DBEM) |
| Max. Counter Pressure (Port T) | 100 bar / 160 bar | Must be piped directly to tank for stability |
| Nominal Flow Rate | Up to 400 L/min | Dependent on Nominal Size (NG6 to NG32) |
| Hysteresis | < 1.5% to 2.5% | Measured with integrated or recommended amplifier |
| Repeatability | < 1.0% | Settled operating condition |
| Response Time (0 to 100% Step) | 20 ms - 60 ms | Varies by valve size and control electronics |
| Hydraulic Fluid Temperature Range | -20 deg C to +80 deg C | Standard NBR seals |
| Ambient Temperature Range | -20 deg C to +50 deg C | For integrated electronics models |
| Viscosity Range | 10 to 380 mm2/s | Recommended: 20 to 100 mm2/s |
| Fluid Cleanliness Class | ISO 4406 (C) 20/18/15 | Filtration rating: 10 to 25 micron nominal |
Configuration Options
▔▔- Mechanical Structure: Available in direct-operated types (for low-flow/pilot stage control, e.g., NG6) and pilot-operated types (for high-flow main pressure control, e.g., NG10 to NG32).
- Control & Electronics:
- External Electronics: Driven via standard Rexroth proportional amplifier cards (e.g., VT-VRPA1 series).
- Integrated Electronics (OBE): On-board electronics with standard factory calibration, supporting +/-10V voltage inputs or 4-20mA current signals.
- Feedback & Monitoring: Optional electrical position feedback (LVDT sensor) on the main stage for closed-loop high-dynamic applications.
- Mounting & Interface: ISO 4401 / CETOP standard subplate mounting patterns (Subplate sizes D03, D05, D07, D08, D10).
- Electrical Connection: Heavy-duty 7-pin (6+PE) connector DIN EN 175201-804 or HIRSCHMANN plug DIN 43650.
Key Materials and Components
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- Valve Body: High-density, fine-grain cast iron housing providing structural rigidity under extreme pressure cycles and resistance to mechanical deformation.
- Hardened Valve Spool & Poppet: Premium grade hardened tool steel with precision-ground seating surfaces to prevent internal wear and maintain minimal leakage over millions of cycles.
- Proportional Solenoid Armature: Wet-pin AC/DC proportional solenoids housed in pressure-tight steel tubes, cooled directly by hydraulic fluid for enhanced heat dissipation and extended coil lifespan.
- Sealing Elements: High-grade Fluorocarbon (FKM/Viton) or Nitrile (NBR) seals selected specifically for fluid compatibility, thermal durability, and zero-leakage internal isolation.
Packaging and Transport Protection
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- Individual Unit Protection: Each valve is thoroughly flushed with anti-corrosion oil, drained, and vacuum-sealed in heavy-duty moisture-proof anti-static poly bags.
- Shock Isolation: Encased within custom-molded high-density EPE foam cradles inside individual corrugated cartons to absorb vibration and prevent impact damage during transit.
- Port Protection: High-visibility plastic sealing plugs are pre-installed on all hydraulic ports (P, T, A, B) to prevent dust, moisture, and particle contamination prior to installation.
- Bulk & Export Packaging: Multiple units are packed into robust, ISPM-15 compliant heat-treated wooden crates or reinforced outer cartons, strapped and shrink-wrapped on export pallets for safe international shipping.
Applications
▔▔- Plastic Injection Molding Machines: Precise back-pressure control during the plasticizing cycle and dynamic clamping force regulation during injection to ensure part consistency and prevent flash.
- Metal Stamping & Hydraulic Presses: Smooth pressure profiling during deep drawing and trimming operations, reducing mechanical shock, noise, and frame stress.
- Die Casting Equipment: Rapid response shot-cylinder pressure relief and real-time locking force control under harsh high-temperature working conditions.
- Industrial Test Rigs: Dynamic pressure simulation for component fatigue testing, providing smooth linear ramp-up and step-change pressure profiles.
Related Models
▔▔| Model Code / Part Number | Nominal Size (NG) | Max. Pressure (bar) | Max. Flow (L/min) | Control Configuration |
| DBETX-1X/315G24N9K4M | NG6 / CETOP 3 | 315 | 2.5 | Direct-operated, External Electronics, 24V DC |
| DBETE-2X/315G24K4V | NG6 / CETOP 3 | 315 | 3.5 | Direct-operated, Integrated Electronics (OBE) |
| DBEM 10-5X/315YG24K4M | NG10 / CETOP 5 | 315 | 120 | Pilot-operated, External Electronics |
| DBEME 20-5X/315YG24K4V | NG20 / CETOP 7 | 315 | 250 | Pilot-operated, Integrated Electronics (OBE) |
| DBEM 30-5X/315YG24K4M | NG30 / CETOP 8 | 315 | 400 | Pilot-operated, High Flow Main Relief |
FAQ
▔▔Q1: What fluid cleanliness level is required for reliable operation of proportional relief valves?
Answer: We recommend maintaining oil cleanliness at ISO 4406 Class 20/18/15 or better. Installing a high-efficiency 10 to 16 micron pressure or return filter prevents pilot orifice clogging and extends valve service life.
Q2: Can an integrated electronics (OBE) model replace an external amplifier card model?
Answer: Physically yes, provided the mounting pattern (CETOP/ISO) matches. However, the electrical wiring must be modified. Standard models require remote driver cards, whereas OBE models require direct 24V DC power supply and a standard control signal (+/-10V or 4-20mA).
Q3: What should be kept in mind during mounting and installation?
Answer: Ensure the subplate surface has a flatness tolerance of 0.01mm per 100mm and a surface roughness of Ra 0.8. Tank line (T port) backpressure should be kept as low and stable as possible to avoid pressure offset errors.
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Product Overview
▔▔The Rexroth DBEP Proportional Pressure Relief Valve is a specialized components designed by Bosch Rexroth to handle this exact task. It acts as an adjustable safety barrier and regulator within a hydraulic circuit, ensuring that pressure levels never exceed safe boundaries while allowing for real-time electronic adjustments.
Key Advantages
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Dynamic Electronic Control: Eliminates manual adjustments, allowing operators or automated controllers to adjust system pressure seamlessly via electrical currents.
Compact Footprint: Built on the standardized Nominal Size 6 (NG6) interface, it packs a high power density into a compact, space-saving layout.
Excellent Reliability: Features Rexroth's field-proven cavity and spool designs that ensure smooth performance, minimal friction, and a long operational lifespan.
Dual-Solenoid Capability: Available in configurations with up to two solenoids (Version "C"), enabling bidirectional or multi-stage pressure staging depending on circuit design.
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Technical Specifications
▔▔| Parameter Category | Technical Metric | Value / Range |
| Mechanical | Nominal Size | NG6 (Size 6) |
| Component Series | 1X | |
| Installation Position | Optional (Vertical or Horizontal) | |
| Weight (Single Solenoid: Version A/B) | Approx. 1.6 kg | |
| Weight (Dual Solenoid: Version C) | Approx. 2.6 kg | |
| Hydraulic | Max. Operating Pressure (Port P) | 50 to 100 bar |
| Max. Allowable Flow Rate | Up to 8 L/min (Version "C" with orifice) | |
| Viscosity Range of Fluid | 2.8 to 380 mm²/s | |
| Fluid Temperature Range | –20°C to +80°C | |
| Performance | Hysteresis | ≤ 3% of maximum value |
| Repeatability | ≤ 1% of maximum value | |
| Response Sensitivity | ≤ 1% | |
| Electrical | Supply Voltage Type | 24 V DC |
| Nominal Current per Solenoid | 700 mA | |
| Solenoid Coil Resistance (Cold at 20°C) | 19.5 Ω | |
| Enclosure Protection Rating | IP 65 (with properly mounted plug) |
Applications
▔▔| Industrial Sector | Typical Application Role | Practical Function |
| Machine Tool Manufacturing | Clamping & Fixturing Circuits | Modulates the hydraulic force used to hold raw metal parts in place during CNC milling operations without warping the material. |
| Plastic Injection Molding | Pilot Control Circuits | Governs the responsive pilot stages of larger hydraulic valves, ensuring smooth mold closing cycles. |
| Industrial Automation | Small Hydraulic Power Units (Packaged Systems) | Serves as a compact electronic pressure adjustment node for material handling conveyors, lifters, and sorting mechanisms. |
| Testing & Calibration Rigs | Automated Pressure Simulation | Simulates real-world variable pressure resistance loads when testing newly manufactured hydraulic pumps or cylinders. |
FAQ
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Q1: What is the primary difference between a standard manual relief valve and the Rexroth DBEP?
A: A manual relief valve uses a mechanical spring that must be compressed by hand using a knob or an Allen wrench to set a static maximum limit. The Rexroth DBEP uses an electrical proportional solenoid. This allows a computer controller or a PLC system to dynamically change the relief pressure setting on the fly by varying the electrical current sent to the valve.
Q2: What happens to the valve if the electrical power fails unexpectedly?
A: The Rexroth DBEP is designed with a spring-assisted rest position. If electrical power or the command signal drops to zero, the solenoids de-energize completely. The internal mechanism defaults back to its lowest pressure state, opening a free passage to the return tank (Port T). This drops the system pressure to a minimal standby level, preventing high-pressure hazards during power losses.
Contact Us
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