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Pressure Relief Valve Rexroth Interchangeable

Pressure Relief Valve DB3U

MANUFACTURER Genuine Huade Hydraulic
STANDARDS ISO 4401 / DIN 24340
AVAILABILITY Factory Direct Stock
Pressure Relief Valve DB3U
TECHNICAL REPLACEMENT NOTICE

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PRESSURE-RELIEF-VALVE-DB3U equivalents. Dimensions, mounting interfaces, and technical parameters are identical. Designed for cost reduction in industrial and mobile hydraulic systems.

• Product features: Pilot operated, solenoid switching, subplate/threaded mounting, Rexroth-compatible design
• Specifications: Size 8-30, flow up to 600 L/min, operating pressure up to 31.5 MPa
• Applications: Operating pressure limitation in industrial hydraulic systems

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💬 WhatsApp: +86-18217786775
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100% Genuine Huade Direct factory authorized supply
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ISO 4401 Mounting ISO 4401 / Rexroth interchangeable
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Secure Packaging Sealed rust-proof global shipping

Technical Data Sheet

  • Product Overview
  • Features & Applications
  • Technical Parameters

Product Overview

Huade Hydraulic pays more attention to the practicality of its products. Pressure relief valve DB3U are competitive with well-know products with good quality and lower price. Huade Hydraulic has introduced cutting-edge technology from Rexroth due to two long-term cooperation with Rexroth. As a leading brand in China's hydraulic industry, Huade® pressure relief valves win wide market recognition and user trust. All branches of the enterprise have passed ISO9001, ISO14001 and OH SAS18001. Huade® leading products have received the CCS (China Classification Society) certificate and widely used in the marine industry.

Mineral oil (for NBR seal)or phosphate ester(for FPM seal)

Key Features

  • Subplate mounting
  • Threaded connection
  • Installation in manifolds
  • 3 adjustment elements:
  • Rotary knob
  • Screw with internal hexagon and protective cap
  • Rotary knob with scale
  • Solenoid operated control via mounted directional valve

Industrial Applications

  • Pressure relief valve DB3U are used for the limitation of the operating pressure.
  • Types DB3U pressure valves are pilot operated pressure relief valves. They may be switched over to different (2 or 3 pressure stage) by solenoids actuated.
  • The pressure relief valves consist mainly of the main valve. 4/3,4/1-Directional control valve (Type WE5...) and three pilot valves.
  • In the de-energized condition the pressure in port A is set by pilot valve(7).
  • The pressure present in port A acts on the main spool (1). At the same time pressure is applied via the control lines (12) and (4), which are fitted with orifices (2) and (3), on the spring loaded side of the main spool (1) and at the poppet(6) in the pilot control valve (7). If the pressure in   port A exceeds the value set at the spring (8), the poppet
  • (6) opens against the spring (8).
  • The signal for this comes internally via the control lines (12) and (4) from port A. The pressure fluid on the spring loaded side of the main spool(1) now flows via the control line (3), poppet (6) into the spring chamber(9). In type DB3U...30/..., it flows internally via the control line (10) to tank, or in type DB3U..30/..Y.., externally via the port Y. Due to the orifices (2) and (3) a pressure drop occurs at the main spool(1), the connection from port A to port B is open. Now the pressure fluid flows from port A to port B while maintaining the valve set operating pressure.
  • When solenoid “a” is energized:  The pressure in port A is set by pilot valve II.
  • When solenoid “b” is energized:  The pressure in port A is set by pilot valve I.
  • The setting pressure of pilot valve(7) should be higher than the setting pressure of the pilot I and II.
  • Type DB2U
  • Type DB2U pressure valves consist mainly of a directional control valve (Type WE5...) and three pilot valves, the function of this valve is basically the same as the valve type DB3U.
  • structure of Pressure Relief Valve DB3U
  • Symbols

Technical Parameters

Mechanical ratings and operating limits for the Pressure Relief Valve DB3U:

Parameter / Dimension Name Value / Rating Specification
Size - 8 - 10 - 15 - 20 - 25 30
Flow(L/min) - Threaded connection - 100 - 200 - 400 600
Flow(L/min) - Subplate mounting - - - 200 - 400 600
Operating pressure (MPa) - ports A,B,X.up to31.5 ports A,B,X.up to31.5
Back pressure (port Y) (MPa) - up to 31.5 up to 31.5
Min. Setting pressure (MPa) - see operating curves see operating curves
Max. Setting pressure (MPa) - up to10 or 31.5 up to10 or 31.5
Pressure fluid - Mineral oil (for NBR seal)or phosphate ester(for FPM seal) Mineral oil (for NBR seal)or phosphate ester(for FPM seal)
Viscosity range (mm ²/s) - 10 to 800 10 to 800
Temperature range(℃) - -30 to +80 -30 to +80
Size of directional valve - see directional valve 4WE5 see directional valve 4WE5

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