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

Pressure Reducing Valve DR 20

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

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PRESSURE-REDUCING-VALVE-DR-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, Rexroth technology integration, multiple mounting options

• Specifications: DR 20 series, inlet pressure up to 31.5 MPa, outlet pressure up to 31.5 MPa

• Applications: Engineering machinery, water conservancy, machine tools, petroleum and petrochemicals

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 →
💬 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

Type DR 20 pressure reducing valve is used to control the pressure. By introducing Rexroth's advanced technology and the most advanced manufacturing equipment from all over the world, Huade® pressure reducing valves are of good quality and low price. Huade is a well-known Chinese national brand, and its products are widely used in many fields such as engineering machinery, water conservancy, machine tools, petroleum and petrochemicals, etc.

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

Maximum permissible degree of contamination of the fluid to NAS 1638.class 9

Characteristic Curves (measured at v=41mm2/s and t=50℃ )

Key Features

  • Subplate mounting
  • For threaded connections
  • For manifold mounting
  • 4 adjustment elements:
  • Rotary knob
  • Sleeve with hexagon and protective cap,
  • Lockable rotary knob with scale
  • Rotary knob with scale
  • 4 pressure settings optional check valve(only for valve for subplate mounting)

Industrial Applications

  • Pilot pressure reducing valve DR 20 is to reducing the pressure in the system.
  • Pressure valves type DR 20 are pilot operated pressure reducing valves, which are controlled from the secondary circuit. They basically consist of main valve (1) with main spool insert(3) and pilot valve (2) with pressure adjustment element.
  • At rest, the valves are open, fluid can freely pass from port B to port A via the main spool insert (3).
  • Pressure present in port A acts upon the bottom side of the main spool. At the same time there is pressure acting on the ball(6) in the pilot valve (2) via the orifice (4) on the spring loaded side of the main piston (3) and via the port(5). Same it is acting on the ball (6) via the orifice (7), control line (8), check valve(9) and orifice (10). According to setting of spring(11), pressure builds up in front of the ball (6), in port (5) and in spring chamber(12), holding the control piston (13) in the
  • open position. Fluid can freely flow from port B to port A via main spool insert (3), until the pressure in port A exceeds the value set at spring (11) and opens the ball (6).The control
  • piston (13) moves to closing position.
  • The desired reduced pressure is achieved, when a balance between the pressure in port A and the pressure set at spring (11) is reached. Pilot oil drain from spring chamber(14) to tank takes place externally via control line (15).
  • Free return flow from port A to B can be achieved by installing an optional check valve (16).
  • A pressure gauge connection (17) allows the reduced pressure in port A to be monitored.
  • structure of subplate mounting type DR 20...50B
  • Symbols of  DR ...50B

Technical Parameters

Mechanical ratings and operating limits for the Pressure Reducing Valve DR 20:

Parameter / Dimension Name Value / Rating Specification
Inlet pressure, port B (MPa) - up to 31.5 up to 31.5
Outlet pressure, port A (MPa) - up to 5.0, 10.0, 20.0, 31.5 up to 5.0, 10.0, 20.0, 31.5
Back pressure, port Y (MPa) - up to 31.5 up to 31.5
Max.flow (Subplate mounting) (L/min) - DR10 - DR20 DR20
Max.flow (Subplate mounting) (L/min) - 150 - 300 300
Max. flow (Threaded connections) (L/min) - DR10 - DR15 - DR20 DR25
Max. flow (Threaded connections) (L/min) - 150 - 300 400
Fluid - Mineral oil(for NBR seal) or phosphate ester(for FPM seal) Mineral oil(for NBR seal) or phosphate ester(for FPM seal)
Fluid temperature range(℃) - -30 up to +80 -30 up to +80
Viscosity range(mm ²/s) - 10 up to 800 10 up to 800
Dearee of contamination - Maximum permissible degree of contamination of the fluid to NAS 1638.class 9 Maximum permissible degree of contamination of the fluid to NAS 1638.class 9
Characteristic Curves (measured at v=41mm2/s and t=50℃ ) Characteristic Curves (measured at v=41mm2/s and t=50℃ )

Related Products