Contact Us
ABOUT PRODUCTS NEWS DOWNLOAD SEND INQUIRY APPLICATIONS CONTACT US
Pressure Relief Valve Rexroth Interchangeable

Pressure Relief Valve DB 20

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

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PRESSURE-RELIEF-VALVE-DB-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 capability, Rexroth DB 20 compatible
• Specifications: Maximum 35.0 MPa pressure, 500 L/min flow rate, subplate/threaded mounting
• Applications: Hydraulic pressure limitation and control systems

Request B2B Quote

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

Send Product Inquiry → 📥 Download PDF Datasheet
💬 WhatsApp: +86-18217786775
✓
100% Genuine Huade Direct factory authorized supply
✓
ISO 4401 Mounting ISO 4401 / Rexroth interchangeable
✓
Secure Packaging Sealed rust-proof global shipping

Technical Data Sheet

  • Product Overview
  • Features & Applications
  • Technical Parameters

Product Overview

Compared with other similar products, Huade® pressure relief valves are more advanced in technology and more durable in this field. Type DB 20 valves can replace DB 20 offered by Rexroth. The factory is committed to providing customers with high-quality and stable hydraulic pressure valves. It has introduced more than 750 advanced production equipment from all over the world. The factory has passed ISO9001, ISO14001 and OH SAS18001. Huade® hydraulic valves are relatively cheap compared to world-renowned brands. Because of its high quality and low price, Huade Hydraulic has attracted many customers at home and abroad and has won the wide recognition of consumers.

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
  • General
  • Types DB pressure valves are pilot operated pressure relief valves.
  • They are used for the limitation of the control pressure.
  • The pressure relief valves (DB) 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). In type DB...50B/...it flows internally via the control line(13) to tank,or in type DB..50/..Y..externally via the control line (14). 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).
  • structure of DB...50B
  • Symbol of DB...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 DB 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.

Related Products