R900445958 ZDR6DA2-4X/150YM Rexroth pressure reducing valve made in Germany
Price:
Negotiable
MOQ:
1
Delivery Time:
2 weeks
Brand:
Rexroth
Product Description
R900445958 ZDR6DA2-4X/150YM Rexroth Pressure Reducing Valve
Product Specifications
| 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 |
Frequently Asked Questions
Q1: Is ZDR a relief 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 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.
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Company
Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.
Location
Nan'an, Fujian Province, China
Contact Person
liyun