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Pressure Relief Valve Rexroth Interchangeable

Pressure Relief Valve DBW 20

MANUFACTURER Genuine Huade Hydraulic
STANDARDS ISO 4401 / DIN 24340
AVAILABILITY Factory Direct Stock
Pressure Relief Valve DBW 20
Pressure Relief Valve DBW 20 - Image 2
Pressure Relief Valve DBW 20 - Image 3
Pressure Relief Valve DBW 20 - Image 4
TECHNICAL REPLACEMENT NOTICE

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PRESSURE-RELIEF-VALVE-DBW-20 equivalents. Dimensions, mounting interfaces, and technical parameters are identical. Designed for cost reduction in industrial and mobile hydraulic systems.

• Product features: Pilot operated design, solenoid unloading, Rexroth-compatible performance
• Specifications: DBW 20 series, up to 35 MPa pressure, 500 L/min flow rate
• Applications: Hydraulic pressure control and system protection

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Submit your target quantity and technical questions. Our hydraulic engineering team will provide a factory-direct quote and lead time estimate within 24 hours.

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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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Technical Data Sheet

  • Product Overview
  • Features & Applications
  • Technical Parameters

Product Overview

Huade Hydraulic often provides hydraulic valves with similar quality to first-line brands but at more affordable prices. Pressure relief valve DBW 20 can match Rexroth in terms of performance and parameters. The reason is that Huade Hydraulic has introduced cutting-edge technology from Rexroth due to two long-term cooperation with Rexroth. As a manufacturer with considerable strength in the field of hydraulic transmission and control, Huade Hydraulic pays more attention to the practicality of its pressure valves and is favored by the market. All branches of the enterprise have passed ISO9001, ISO14001 and OH SAS18001. Huade® is a famous national brand China due to reliable quality and stable performance of its products.

Technical data for the directional valves

Maximum operating pressure at ports A.B. X (MPa)

flow dependent (see characteristic curves )

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

Key Features

  • Subplate mounting
  • Porting pattern to DIN 24 340, form E,ISO 6264 and CETOP - RP 121H
  • Pipe connection
  • Insert connection
  • Three adjustment elements:
  • Rotary knob
  • Hex. head screw with protective cap
  • Lockable rotary knob with scale
  • Solenoid operated unloading via built-in directional spool valve

Industrial Applications

  • The main function of pressure relief valves DBW 20 is to limit and solenoid actuate unloading of the control pressure.
  • General
  • Pilot operated pressure relief valves DBW consist mainly of the main valve (1) with main spool assembly (3) and pilot operated valve (2) with pressure adjustment element.
  • Pressure relief valve type DB
  • The pressure present in port A acts on the main spool (3). At the same time pressure is applied via the control lines (6) and (7), which are fitted with orifices (4) and (5), on the spring loaded side of the main spool (3) and at the ball (8) in the pilot control valve (2). If the pressure in port A exceeds the valve set at the spring (9), the ball (8) opens against the spring (9).
  • The signal for this comes internally via the control lines (10) and (6) from port A. The pressure fluid on the spring loaded side of the main spool(3) now flows via the control line (7), orifice bore (11) and ball (8) into the spring chamber(12). Due to the orifices (4) and (5) a pressure drop occurs at the main spool (3), the connection from port A to port B is open. Now the pressure fluid flows from port A to port B whilst maintaining the set operating pressure.
  • The pressure relief valve may be unloaded or switched over to a different pressure (second pressure stage) via port "X” (15).
  • Pressure relief valve type DBW
  • The function of this valve is basically same as the valve type DB
  • The unloading at the main spool(3),however,is achieved by actuating the built-in directional valve(16).
  • structure of DBW...50B
  • Symbol of DBW...50B
  • The fluid must be filtered. Minimum filter fineness is 20 ㎛.
  • The tank must be sealing up and an air filter must be installed on air entrance.
  • Products without subplate when leaving factory, if need them, please ordering specially.
  • Valve fixing screws must be high intensity level (class 10.9). Please select and use,them according to the parameter listed in the sample book.
  • Roughness of surface linked with the valve is required surface roughness is 0.8.
  • Surface finish of mating piece is required to 0.01/100mm.

Technical Parameters

Mechanical ratings and operating limits for the Pressure Relief Valve DBW 20:

Parameter / Dimension Name Value / Rating Specification
General General
Installation - optional optional
Weight - - DB10 - DB15 - DB20 - DB25 DB30
Weight - Subplate mounting - DB (Kg) - 2.6 - - - 3.5 4.4
Weight - Subplate mounting - DBW (Kg) - 3.8 - - - 4.7 5.6
Weight - Subplate mounting - DBC (Kg) - 1.2 (type DBW add 1.2Kg 1.2 (type DBW add 1.2Kg
Weight - Subplate mounting - DBC10 or 30 (Kg) - 1.5 (DBWC10 or 30add 1.2Kg) 1.5 (DBWC10 or 30add 1.2Kg)
Weight - Threaded connection - DB..G. (Kg) - 5.3 - 5.2 - 5.1 - 5.0 4.8
Weight - Threaded connection - DBW..G. (Kg) - 6.5 - 6.4 - 6.3 - 6.2 6.0
Technical data for the directional valves - see WE6.../... see WE6.../...
Hydraulic technical data Hydraulic technical data
Maximum operating pressure at ports A.B. X (MPa) - up to 35.0 up to 35.0
Maximum back pressure at port Y - DB (MPa) - up to 31.5 up to 31.5
Maximum back pressure at port Y - DBW.6A.(standard solenoids) (MPa) - AC(DC)10.0 AC(DC)16.0 AC(DC)10.0 AC(DC)16.0
Maximum back pressure at port Y - DBW.6B.(high-power solenoids) (MPa) - AC(DC) 16.0 AC(DC) 16.0
Settable pressure - Minimum (MPa) - flow dependent (see characteristic curves ) flow dependent (see characteristic curves )
Settable pressure - Maximum (MPa) - Maximum5.0, 10.0, 20.0, 31.5, 35.0 Maximum5.0, 10.0, 20.0, 31.5, 35.0
Maximum flow - - DB10 - DB15 - DB20 - DB25 DB30
Maximum flow - Subplate mounting (L/min) - 250 - - - 500 650
Maximum flow - Threaded connections (L/min) - 250 - 500 650
Pressure fluid - Mineral oil (for NBR seal)or phosphate ester(for FPM seal) Mineral oil (for NBR seal)or phosphate ester(for FPM seal)
Pressure fluid temperature range(℃) - -30 to +80 -30 to +80
Viscosity range  (mm ²/s) - 10 to 800 10 to 800
Degree of contamination - NAS 1638 class 9. NAS 1638 class 9.

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