DBDS6 DBDS10 Direct Operated Relief Valve | Rexroth Series Replacement

Genlu Hydraulic proudly introduces our DBDS Series (DBDS6 / DBDS10 / DBDH6 / DBDH10) industrial-grade, high-pressure direct-operated pressure relief valves. Positioned as primary safety elements and overload protection valves inside modern fluid circuits, this valve line is widely deployed across medium-to-high pressure industrial power packs, CNC metal-cutting machines, automated hydraulic clamping fixtures, and mobile machinery pilot sub-circuits. This series delivers a precision-manufactured, drop-in replacement for the industry-standard DBD series (specifically Size 6 and Size 10, 3X and 1X series) pioneered by Rexroth. We specialize in cross-referencing and supplying the entire structural mounting matrix, featuring the DBDS6P10/315, DBDS6P10/200, and DBDS10P12/50 variants in standard cartridge, subplate (Type G), and threaded inline (Type P) configurations.

Inside heavy-duty hydraulic architectures, a direct-operated relief valve provides rapid pressure limiting to absorb volatile surge spikes and isolate sensitive components from terminal destruction. Genlu’s DBDS series conforms strictly to international industrial installation matrices. We guarantee 100% Drop-in Interchangeability across standard cartridge cavities, metric/inch port connections, poppet-to-seat seating geometries, and calibrated damping orifice configurations. Prior to facility clearance, every relief valve assembly undergoes 100% full-pressure cracking stability tracing, high-frequency step-response pressure impulse auditing, and zero-standby ultra-low internal slippage checks, ensuring immediate opening behavior and reliable seating without risk of mechanical binding.

Technical Specifications

• Product Line: DBDS/DBDH Series Industrial High-Pressure Direct-Operated Pressure Relief Valve (Safety Valve)

• Core Covered Designation Matrix:

  • DBDS6P10/315 (Size 6, screw adjustment, threaded inline execution, 315 bar maximum setting rating, 3X design series)

  • DBDS6P10/200 (Size 6, screw adjustment, threaded inline execution, 200 bar maximum setting rating, 3X design series)

  • DBDS10P12/50 (Size 10, screw adjustment, threaded inline execution, 50 bar maximum setting rating, 1X design series)

• Nominal Valve Sizes (Sizes): Size 6 (NG6) and Size 10 (NG10)

• Maximum Permissible Delivery Volumetric Flow Limits:

  • DBDS6 Configurations: Up to 50 $L/min$ (13.2 GPM)

  • DBDS10 Configurations: Up to 120 $L/min$ (31.7 GPM)

• Calibrated Maximum Pressure Stages:

  • 50 bar Rating (Alphanumeric Code: /50)

  • 100 bar Rating (Alphanumeric Code: /100)

  • 200 bar Rating (Alphanumeric Code: /200)

  • 315 bar Rating (Alphanumeric Code: /315)

  • Heavy-Duty Max Operational limit up to 400 bar (Alphanumeric Code: /400)

• Adjuster Mechanism Class Options:

  • DBDS Category: Internal hex set-screw fitted with a removable metal protection cap

  • DBDH Category: Ergonomic composite handwheel / rotary knob configuration

• Allowable Fluid Temperature Envelope: -30°C to +80°C

• Average Unit Mass Weight: Approx. 0.4 kg (Cartridge insert element) up to 2.5 kg (Complete inline threaded block assembly)

Key Technical Advantages:

• Ultra-Fast Millisecond Dynamic Response to Clip Surge Spikes: The direct-operated poppet reacts without the hydraulic fluid delay inherent in pilot-operated relief options. When a system hits an abrupt mechanical stop, the poppet compresses the heavy-duty spring within 10 milliseconds to vent excess flow, safely smoothing pressure spikes before they can stress pumps or digital pressure transmitters.

• Vacuum-Hardened Stainless Poppets for Leak-Free Reseating: The core poppet and matching seat are forged from high-tensile spring/stainless steel hardened to HRC 58-62 via vacuum heat treatment. Precision mating surfaces are fine-ground to ensure a gas-tight seal. At normal operating pressures, internal bypass leakage is practically zero, preventing cylinder drift and avoiding wasted thermal energy.

• Acoustically Dampened Internals for Quiet, High-Velocity Venting: The internal fluid channels feature a flow-optimized, widened casting design developed through finite element fluid analysis. This configuration smooths out high-velocity fluid jets to reduce aeration and suppress noise-inducing cavitation. Paired with a precision damping land on the poppet tail, it effectively prevents high-frequency chattering or spring resonance.

• Modular Multi-Configuration Adaptation for Flexible Integration: The DBDS series offers versatile mounting flexibility. The same self-contained cartridge insert can be threaded into a custom manifold block as a standalone thermal relief valve, or paired with a standard threaded sub-block for inline piping, or mounted on standard subplates to help reduce parts inventory.

Application Areas:

• Automated Machinery & Hydraulic Workholding: Secondary pressure regulation and over-pressure backup safety protection for high-precision CNC machining fixtures.

• Compact & Modular Industrial Hydraulic Power Units (HPUs): Main relief protection for automotive workshop lifts, compact recycling balers, and logistical liftgate networks.

• Pilot Circuit Isolation in Heavy Construction Equipment: Dedicated safety regulation and pressure limiting on auxiliary pilot control manifolds within high-flow excavator or crane networks.

Expert Maintenance Tips:

• Strictly Align the Inflow and Outflow Port Routing: When plumbing an inline threaded (Type P) DBDS6 or DBDS10 valve, carefully verify the cast labels for the P (Pressure port) and T (Tank return port) on the housing. Reversing these lines directs high-pressure fluid into the spring chamber, disrupting the force balance and causing the valve to chatter violently or remain stuck open at low pressures.

• Operate Exclusively Within the Specified Spring Pressure Stage: Each DBDS code designates a precise maximum pressure capability (e.g., /50 denotes 50 bar, /315 denotes 315 bar). If the valve is a /200 variant, never attempt to crank the adjustment bolt past its stop to achieve 300 bar. Forcing the adjustment bolt too far down will bind the spring coils into a solid rod, disabling the relief function and risking severe pump damage or line ruptures.

• Maintain Fine Fluid Filtration to Prevent Damping Hole Clogging: The internal poppet design relies on a small, integrated damping orifice to suppress hydraulic oscillations. If fluid contamination or micro-shavings bypass system filters, they can settle in the close-tolerance sliding surfaces or block the orifice. This blockage can lock the valve in a partially open position, leading to erratic pressure readings or a total loss of system pressure.