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R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany
R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany
Specifications
Payment Terms :
Western Union,D/P,T/T,D/A,L/C
Max. Flow Rate (Qmax) :
approx. 60 L/min (Size 6 ZDR)
Supply Ability :
100
MOQ :
1
Viscosity Range :
10–800 mm²/s
Pilot Oil Drain :
Y = External pilot drain​ (separate Y‑port to tank — isolates set pressure from T‑line backpressure)
Brand Name :
Rexroth
Max. Operating Pressure (Secondary port) :
315 bar
Model Number :
R900410855 ZDR6DA2-4X/210Y
Certification :
ISO
Fluid Temperature Range :
-30 °C to +80 °C (NBR seals)
Place of Origin :
Germany
Packaging Details :
wooden box
Delivery Time :
2 weeks
Description
R900410855 ZDR6DA2-4X/210Y Pressure Valve
Direct-acting, 3-way pressure reducing valve from Rexroth, Germany. Sandwich/stackable mounting design for hydraulic systems.
Technical Specifications
Part Number R900410855
Model ZDR 6 - DA2 - 4X / 210Y
Valve Type Direct-acting, 3-way pressure reducing valve (sandwich/stackable)
Nominal Size (NG) 6 - sandwich mounting per ISO 5781 / NG6 (DIN 24340 Form E)
Function Reduces & maintains pressure in secondary circuit to set value; 3-way action (excess dumps via external drain)
Adjustment Type DA2 = Rotary hand knob with protective cap (hand-adjustable, no tool)
Component Series 4X (series 40-49, dimensionally interchangeable)
Max. Adjustable Reduced Pressure 210 bar (adj. range typically 4-210 bar)
Max. Operating Pressure (Primary P-port) 315 bar
Max. Operating Pressure (Secondary port) 315 bar
Max. Flow Rate (Qmax) approx. 60 L/min (Size 6 ZDR)
Pilot Oil Drain Y = External pilot drain (separate Y-port to tank)
Seal Material NBR (standard, for mineral oil HL/HLP, HFC)
Hydraulic Fluid Mineral oil HL, HLP per DIN 51524; HFC (water-glycol); HLPD, HVLP, HVLPD
Fluid Temperature Range -30 °C to +80 °C (NBR seals)
Viscosity Range 10-800 mm²/s
Weight (approx.) 1.7 kg
Body Material Steel / cast iron, zinc-plated
R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany
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Frequently Asked Questions
Is ZDR a relief valve / overflow valve?
No. A relief valve (DB/DBD) limits upstream/system pressure; a pressure reducing valve (ZDR) maintains a lower, constant pressure in a downstream (secondary) circuit. If inlet (primary) pressure drops below the set reduced pressure, the ZDR opens fully and passes flow unregulated - it does not limit pump pressure.
What does "DA2 /210Y" mean?
DA2 = NG6 sandwich, rotary hand knob with protective cap (hand-adjustable).
/210 = spring stage, max. adjustable reduced pressure = 210 bar (medium stage; /75 low, /150 low-med, /315 high).
Y = external pilot drain - pilot oil returns via separate Y-port to tank, not via the sandwich T-channel.
How do I adjust the reduced pressure?
With the secondary circuit under flow, lift/remove the cap and turn the rotary knob clockwise to increase, counterclockwise to decrease. Verify with a pressure gauge at the secondary port - the knob has no calibrated scale. Factory preset is typically near minimum; always fine-tune under operating flow if possible.
How is the valve mounted?
As a sandwich (stackable) valve between a directional control valve and the NG6 subplate. Uses NG6 DIN 24340 Form E / ISO 5781 bolt pattern. Sandwich port IDs: P = primary (high pressure from pump / P-port of subplate), A (or B) = reduced secondary pressure to actuator, T = tank return, Y = external pilot drain to tank (must be plumbed!).
Why specify the "Y" (external drain) version?
If the T-line in the valve stack has >2-3 bar backpressure, an internally drained ZDR's set reduced pressure will increase by the amount of T-backpressure. The Y-version drains the pilot independently to tank, keeping the set reduced pressure stable. Always use Y-version if T-backpressure is present or uncertain.
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R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany

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Product Detail
Payment Terms :
Western Union,D/P,T/T,D/A,L/C
Max. Flow Rate (Qmax) :
approx. 60 L/min (Size 6 ZDR)
Supply Ability :
100
MOQ :
1
Viscosity Range :
10–800 mm²/s
Pilot Oil Drain :
Y = External pilot drain​ (separate Y‑port to tank — isolates set pressure from T‑line backpressure)
Contact Supplier
R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany

Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.

Verified Supplier
2 Years
fujian
Business Type :
Manufacturer, Exporter
Main Products :
Gear Pump, Rexroth Hydraulic Pump, Parker Denison Hydraulic Pump
Total Annual :
1 million-10 millon
Employee Number :
>50
Certification Level :
Verified Supplier
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