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Home / Products / Hydraulic Components / Hydraulic Parts / SUN DPBB-LAN,DPBB-LBN,DPBB-LDN,DPBB-LEN,DPBB-LWN, Pilot operated pressure relief valve

SUN DPBB-LAN,DPBB-LBN,DPBB-LDN,DPBB-LEN,DPBB-LWN, Pilot operated pressure relief valve

Wechat:+86 188-7629-1732

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  • SUN DPBB Series Pilot Operated Pressure Relief Valves Product Description

  • Overview

  • The  SUN DPBB-LAN, DPBB-LBN, DPBB-LDN, DPBB-LEN, DPBB-LWN form a high-performance family of pilot operated pressure relief valves, expertly engineered by Sun Hydraulics for critical hydraulic pressure management and overpressure protection. Designed as compact cartridge-style components, these valves are tailored to fit industry-standard cavities, delivering uncompromising precision, low hysteresis, and robust durability across low, medium, and high-pressure hydraulic systems. Ideal for industrial machinery, mobile equipment, marine operations, and oil & gas applications, the DPBB series stands out as a reliable solution for engineers and system integrators seeking stable, long-lasting pressure control.
  • Core Features & Model-Specific Benefits

  • Precision Pilot-Operated Regulation TechnologyUnlike direct-acting relief valves, the DPBB series employs a dedicated pilot valve to modulate the main valve piston, enabling ultra-accurate pressure setting with minimal pressure drift (≤3% typical hysteresis). This design ensures a flat pressure-flow curve, maintaining consistent system pressure even under fluctuating flow conditions, which reduces energy waste and extends the service life of downstream hydraulic components. The integrated pilot port also supports remote pressure adjustment, allowing operators to fine-tune settings from a safe distance or integrate with automated PLC control systems for enhanced operational efficiency and safety.
  • Tailored Performance for Diverse Hydraulic Needs

  • DPBB-LAN: Optimized for low-pressure hydraulic circuits, this model features fast response times and reliable pressure limiting, making it ideal for light-duty industrial equipment, auxiliary hydraulic systems, and small-scale machinery.

  • DPBB-LBN: Equipped with a balanced piston structure, it excels in medium-pressure applications, minimizing pressure fluctuations during load changes. It is perfectly suited for construction machinery, material handling equipment, and agricultural machinery.

  • DPBB-LDN: Built to withstand extreme high-pressure environments up to 5000 psi (345 bar), this variant delivers rugged durability for heavy industrial hydraulic presses, mining equipment, and oil & gas wellhead control systems.

  • DPBB-LEN: Engineered for precision-focused low-to-medium pressure systems, it boasts enhanced pressure stability and ultra-low hysteresis, suitable for automated production lines, CNC machines, and precision hydraulic tools.

  • DPBB-LWN: Features an externally drained pilot configuration, eliminating backpressure interference to ensure stable operation in complex multi-circuit hydraulic setups such as marine steering systems, offshore platforms, and heavy-duty industrial equipment.


  • Standard Cavity Compatibility & Hassle-Free InstallationAll valves in the DPBB series are designed to fit the industry-standard T-23A cavity. This cartridge-style design enables drop-in installation and replacement without modifying existing hydraulic manifolds, significantly reducing maintenance time and system downtime. It also lowers integration costs for equipment manufacturers and end-users alike, streamlining both initial setup and future servicing.
  • Rugged Construction for Harsh Operating ConditionsManufactured with high-grade alloy materials and precision machining, these valves resist wear, corrosion, and fatigue. They perform reliably across a wide temperature range (-20°C to +100°C) and can withstand high vibration, dust, and moisture—making them suitable for the most demanding industrial, outdoor, and offshore applications.
  • Technical Specifications

  • Parameter DPBB Series Range
    Maximum Operating Pressure Up to 5000 psi (345 bar)
    Flow Capacity Up to 160 L/min
    Cavity Compatibility Industry-standard T-23A
    Pilot Drain Configuration Internal/External (varies by model)
    Operating Temperature Range -20°C to +100°C
    Typical Hysteresis ≤3%
  • Application Scenarios

  • The SUN DPBB series is a versatile solution for a broad spectrum of hydraulic systems:

  • Construction & Mining: Excavators, loaders, and mining trucks, providing overpressure protection for hydraulic circuits operating in rough terrain and heavy-load conditions.

  • Industrial Manufacturing: Injection molding machines, metal forming equipment, and CNC hydraulic presses, ensuring precision pressure control for consistent production quality.

  • Marine & Offshore: Shipboard steering, winch systems, and offshore platform hydraulic equipment, withstanding saltwater corrosion and harsh marine environments.

  • Agricultural Machinery: Tractors, harvesters, and irrigation systems, delivering reliable pressure regulation in outdoor, high-dust operating conditions.

  • Oil & Gas: Wellhead control panels and pipeline hydraulic systems, ensuring safe and stable operation under high-pressure, corrosive conditions.

  • Why Choose SUN DPBB Series Valves?

  • Sun Hydraulics Quality Assurance: Every valve undergoes rigorous testing to meet global industry standards, backed by decades of expertise in hydraulic component innovation and manufacturing.

  • Cost-Effective Integration: The drop-in cartridge design eliminates the need for custom manifold fabrication, reducing installation and maintenance costs while minimizing system downtime.

  • Versatile Performance Coverage: The full model lineup covers low, medium, and high-pressure applications, eliminating the need to source multiple valve types for diverse hydraulic system requirements.

  • Long-Term Reliability: Corrosion-resistant materials and precision engineering ensure extended service life, even in the most demanding operating environments, lowering total cost of ownership.

  • Order & Technical Support

  • We supply 100% genuine SUN DPBB series valves, paired with professional technical consultation, installation guidance, and after-sales support. Our team of hydraulic experts can help you select the right model for your specific system needs. Contact us today to optimize your hydraulic system’s performance, safety, and efficiency.

More models:

  1. DPBB-KAN,DPBB-KBN,DPBB-KDN,DPBB-KEN,DPBB-KWNDPBB-CAN,DPBB-CBN,DPBB-CDN,DPBB-CEN,DPBB-CWNDPBB-LAV,DPBB-LBV,DPBB-LDV,DPBB-LEV,DPBB-LWVDPBB-KAV,DPBB-KBV,DPBB-KDV,DPBB-KEV,DPBB-KWVDPBB-CAV,DPBB-CBV,DPBB-CDV,DPBB-CEV,DPBB-CWV

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