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

Pressure Shut-off Valve DA

MANUFACTURER Genuine Huade Hydraulic
STANDARDS ISO 4401 / DIN 24340
AVAILABILITY Factory Direct Stock
Pressure Shut-off Valve DA
Pressure Shut-off Valve DA - Image 2
TECHNICAL REPLACEMENT NOTICE

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

• Product features: Pilot operated, solenoid actuated unloading, Rexroth-compatible, 4 adjustment elements
• Specifications: Size 10/20/30, max flow 40-250 L/min, pressure up to 31.5 MPa
• Applications: Accumulator loading systems, high/low pressure pump switching

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

As a leading brand in China's hydraulic industry, Huade® hydraulic pressure valves are favored by the market for their quality comparable to first-tier brands with more affordable prices. Huade® pressure relief valve DA can replace the series products offered by Rexroth due to two long-term cooperation. All branches of the enterprise have passed the three major national system certifications, namely, ISO9001, ISO14001 and OH SAS18001. Huade Hydraulic has introduced more than 750 advanced equipment from all over the world. It also has a good inspection system to ensure the superior performance of each pressure valve.

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
  • Pressure control valves type DA 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 DA 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-off valve type DA
  • 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 Tor 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).
  • structure of DA10...30B
  • Symbols of DA...30B

Technical Parameters

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

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

Related Products