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Pressure Valve Rexroth Interchangeable

Pressure Shut-off Valve DAW

MANUFACTURER Genuine Huade Hydraulic
STANDARDS ISO 4401 / DIN 24340
AVAILABILITY Factory Direct Stock
Pressure Shut-off Valve DAW
TECHNICAL REPLACEMENT NOTICE

This Huade® directional control valve serves as a 100% direct drop-in replacement for Bosch Rexroth PRESSURE-SHUT-OFF-VALVE-DAW 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 actuated unloading, Rexroth-compatible with lower price
• Specifications: Sizes 10/20/30, max flow 40-250 L/min, pressure up to 31.5 MPa
• Applications: Accumulator loading systems, high/low pressure pump switching

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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

Established in 1979, Huade Hydraulic has cooperated with Bosch Rexroth twice. The two long term cooperation enable Huade® pressure valves to reach the same level as Rexroth products. Type DAW pressure shut-off valves can replace the same series from Rexroth with a lower price. As a leading brand in China's hydraulic industry, all branches of the enterprise have passed ISO9001, ISO14001 and OH SAS18001. Huade® pressure shut-off valve DAW has passed CE certificate. Huade® pressure valves has won wide market recognition and user trust.

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

Maximum permissible degree of contamination of the pressure fluid is to NAS 1638 class 9. We therefore recommend a filter with a minimum retention rate of β10 ≥ 75

Key Features

  • For subplate mounting:
  • 4 adjustment elements:
  • ● Rotary knob
  • ● Sleeve with internal hexagon and protective cap
  • ● Lockable rotary knob with scale
  • ● Rotary knob with scale
  • 3 pressure ratings
  • Solenoid actuated unloading via a built-in directional valve

Industrial Applications

  • Pressure control valves type DAW are pilot operated pressure shut-off valves. They are used to switch a pump flow over to unpressurised by-pass as soon as the accumulator loading pressure is reached. Further applications for the valve are in systems that have high and low pressure pumps. In this case the low pressure pump is switched to unpressurised by-pass as soon as the set high pressure is reached.
  • Pressure shut off valves basically consist of the main valve with the main spool assembly, pilot valve with pressure adjustment element and check valve. In size 10 valves, the check valve is built into the main valve. In valve sizes 25 and 32 the check valve is built into a separate plate installed under the main valve.
  • Pressure shut-of valve type DAW
  • Diverting pump flow from P to A or P to T.
  • The pump delivers flow via check valve (1) into the hydraulic system (P to A). Pressure in port A acts via pilot line (3) on the pilot control spool (4). At the same time, pressure in port P passes via orifices (5) and (7) to the spring loaded side of the main spool (6) and poppet (8) in the pilot valve (2). As soon as the set cut-off pressure in the hydraulic system is reached, the poppet(8) lifts off against spring(9). Pressure fluid now flows via orifices(5) and(7) into spring chamber(11). From
  • here, the fluid is returned to tank either internally via control line in valve type DA...30B/... or externally via control line in valve type DA.30B/..Y... Due to orifices(5) and (7), a pressure drop is now present at the main spool (6). The main spool(6) now lifts off its seat and opens the connection from P to T. The check valve(1) now doses the connection from A to P. The poppet(8) is now held open by the system pressure via pilot spool (4).
  • Diverting pump flow from P to T or P to A.
  • The area of the pilot spool (4) is 17% greater than effective area of the poppet(8). The effective force on the pilot spool (4) is, therefore, 17% greater than the effective force on the poppet (8) . When the actuator pressure falls in relation to the cut-off pressure by a valve which corresponds to the switching pressure differential, spring(9) pushes poppet(8) on to its seat. Pressure is then built up on the spring loaded side of the main spool(6).In conjunction with spring(10), this closes the main spool(6) and isolates the connection from P to T. The pump flow passes once more via the check valve (1) into the hydraulic system(P to A).
  • A solenoid actuated directional valve(12) can, however switch the set cut-off pressure which is under the pilot valve (2) either from P to T or form P to A.
  • structure of DAW20,30 ...30B
  • Symbols of DAW...30B

Technical Parameters

Mechanical ratings and operating limits for the Pressure Shut-off Valve DAW:

Parameter / Dimension Name Value / Rating Specification
Size - 10 - 20 30
Max.flow (L/min) - 40 - 100 250
pressure rang - See characteristic curve See characteristic curve
Operating pressure port A (MPa) - up to 31.5 up to 31.5
Max. settable pressure (MPa) - up to 8, up to 16, up to 31.5 up to 8, up to 16, up to 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) - 10~800 10~800
Pressure fluid temperature range(℃) - -30 to +80 -30 to +80
Degree of contamination (㎛) - Maximum permissible degree of contamination of the pressure fluid is to NAS 1638 class 9. We therefore recommend a filter with a minimum retention rate of β10 ≥ 75 Maximum permissible degree of contamination of the pressure fluid is to NAS 1638 class 9. We therefore recommend a filter with a minimum retention rate of β10 ≥ 75
Weight (kg) - DA - 3.8 - 7.7 13.4
Weight (kg) - DAW - 4.9 - 8.8 14.5

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