R900410855 ZDR6DA2-4X/210Y Pressure valve from Rexroth, Germany
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product 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 |
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.
/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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Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun