Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
| Part Number | R900445958 |
| Component Series | 4X (series 40–49, dimensionally interchangeable) |
| Supply Ability | 100 |
| Model | ZDR6DA2-4X/150YM |
| Adjustment Type | DA2 = Rotary hand knob with protective cap (hand-adjustable, no tool) |
| Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Delivery Time | 2 weeks |
| Packaging Details | wooden box |
| Max. Adjustable Reduced Pressure | 150 bar (adjustment range typically 4–150 bar) |
| Certification | ISO |
| Brand Name | Rexroth |
| Place of Origin | Germany |
| Model Number | R900445958 ZDR6DA2-4X/150YM |
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Product Specification
| Part Number | R900445958 | Component Series | 4X (series 40–49, dimensionally interchangeable) |
| Supply Ability | 100 | Model | ZDR6DA2-4X/150YM |
| Adjustment Type | DA2 = Rotary hand knob with protective cap (hand-adjustable, no tool) | Payment Terms | Western Union,T/T,D/P,D/A,L/C |
| Delivery Time | 2 weeks | Packaging Details | wooden box |
| Max. Adjustable Reduced Pressure | 150 bar (adjustment range typically 4–150 bar) | Certification | ISO |
| Brand Name | Rexroth | Place of Origin | Germany |
| Model Number | R900445958 ZDR6DA2-4X/150YM | ||
| High Light | Rexroth pressure reducing valve ，Rexroth hydraulic valve made in Germany ，ZDR6DA2-4X/150YM pressure reducing valve | ||
|
Parameter |
Value |
|---|---|
|
Part Number |
R900445958 |
|
Model |
ZDR 6 - DA2 - 4X / 150YM |
|
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 pressure in secondary circuit to set value; 3-way action (excess pressure dumped 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 |
150 bar (adjustment range typically 4–150 bar) |
|
Max. Operating Pressure (Primary P-port) |
315 bar |
|
Max. Operating Pressure (Secondary A/B 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 |
M = FKM (Viton) — specified by "M" suffix in type code / ordering data |
|
Hydraulic Fluid |
Mineral oil HL, HLP; HEES, HETG (bio-oils); HFC (with NBR — FKM also acceptable for HFC short-term); NOT for HFD(R) without special confirmation |
|
Fluid Temperature Range |
-20 °C to +90 °C (FKM seals — wider than NBR) |
|
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?
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 primary (inlet) pressure drops below the set reduced pressure, the ZDR opens fully and passes flow unregulated.
Q2: What does "DA2 /150YM" mean?
DA2 = NG6 sandwich, rotary hand knob with cap (hand-adjustable).
/150 = spring stage, max. adjustable reduced pressure = 150 bar (low-pressure stage; other stages: /75, /210, /315).
Y = external pilot drain — pilot oil returns via separate Y-port to tank.
M = FKM (Viton) seal material.
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.
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), A (or B) = reduced secondary pressure to actuator, T = tank return, Y = external pilot drain to tank (must be connected!).
Q5: Why use the "Y" (external drain) version?
If the T-line in the valve stack has >2–3 bar backpressure, an internally drained ZDR's set pressure will increase by the amount of T-backpressure. The Y-version isolates the pilot from T, keeping the set reduced pressure stable. Always plumb Y separately to tank if T-backpressure exists.
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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