Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Supply Ability | 100 |
| Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Payment Terms | Western Union,D/P,T/T,D/A,L/C |
| Max. Operating Pressure (Secondary port) | 315 bar |
| Pilot Oil Drain | Y = External pilot drain (separate Y‑port to tank — isolates set pressure from T‑line backpressure) |
| Viscosity Range | 10–800 mm²/s |
| Max. Flow Rate (Qmax) | approx. 60 L/min (Size 6 ZDR) |
| Packaging Details | wooden box |
| Delivery Time | 2 weeks |
| Model Number | R900410855 ZDR6DA2-4X/210Y |
| Brand Name | Rexroth |
| Certification | ISO |
| Place of Origin | Germany |
View Detail Information
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Product Specification
| Supply Ability | 100 | Fluid Temperature Range | -30 °C to +80 °C (NBR seals) |
| Payment Terms | Western Union,D/P,T/T,D/A,L/C | Max. Operating Pressure (Secondary port) | 315 bar |
| Pilot Oil Drain | Y = External pilot drain (separate Y‑port to tank — isolates set pressure from T‑line backpressure) | Viscosity Range | 10–800 mm²/s |
| Max. Flow Rate (Qmax) | approx. 60 L/min (Size 6 ZDR) | Packaging Details | wooden box |
| Delivery Time | 2 weeks | Model Number | R900410855 ZDR6DA2-4X/210Y |
| Brand Name | Rexroth | Certification | ISO |
| Place of Origin | Germany | ||
| High Light | Rexroth hydraulic pressure valve ，R900410855 pressure valve ，ZDR6DA2-4X/210Y hydraulic valve | ||
|
Parameter |
Value |
|---|---|
|
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 — isolates set pressure from T‑line backpressure) |
|
Seal Material |
NBR (standard, code omitted = NBR, 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 |
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Q1: 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, constantpressure 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.
Q2: 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.
Q3: 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.
Q4: 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!).
Q5: 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.
Company Details
Business Type:
Manufacturer,Exporter
Total Annual:
1 million-10 millon
Employee Number:
>50
Ecer Certification：
Verified Supplier
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha... Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd. has been established for many years and has now developed into an international trading company supplying various hydraulic machinery parts, oil pumps and valves. We are one of the few Chinese companies with multiple products and cha...
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