R900410849 ZDR6DA2-4X/150Y German Rexroth direct acting pressure reducing valve

Name: R900410849 ZDR6DA2-4X/150Y German Rexroth direct acting pressure reducing valve
Brand: Quanzhou Yisenneng Hydraulic Electromechanical Equipment Co., Ltd.

Price Negotiable

Price: Negotiable

MOQ: 1

Delivery Time: 2 weeks

Brand: Rexroth

Product Description

R900410849 ZDR6DA2-4X/150Y German Rexroth Direct Acting Pressure Reducing Valve

Product Specifications

Parameter	Value
Part Number	R900410849
Model	ZDR 6 - DA2 - 4X / 150Y
Valve Type	Direct-acting, 3-way pressure reducing valve (sandwich/stackable)
Nominal Size (NG)	6 - sandwich mounting per ISO 5781 / NG6 (DIN 24 340 Form E)
Function	Reduces pressure in secondary circuit (port A/B on sandwich) to set value; 3-way action (can dump excess pressure to tank via internal 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 or B port)	315 bar
Max. Flow Rate (Qmax)	approx. 60 L/min (Size 6 ZDR)
Pilot Oil Drain	Y = External pilot drain (separate drain port Y 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

Rexroth ZDR6DA2-4X/150Y pressure reducing valve

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Frequently Asked Questions

Q1: Is ZDR a pressure 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 regardless of higher primary pressure (within its range). If primary pressure drops below the set reduced pressure, the ZDR opens fully and does not regulate.

Q2: What does "DA2" and "/150Y" mean?

DA2 = NG6 sandwich version, adjustment by rotary hand knob with protective cap (hand-adjustable)
/150 = spring pressure stage, maximum adjustable reduced pressure = 150 bar (this is the low-pressure stage; other stages are /75, /210, /315)
Y = external pilot drain - pilot oil returns via a separate Y-port to tank, not via the T-sandwich channel

Q3: How do I adjust the reduced pressure?

With the secondary circuit pressurized, lift/remove the cap and turn the rotary knob clockwise to increase the reduced pressure, counterclockwise to decrease. Read the actual secondary pressure with a gauge - the knob has no scale. The factory preset is typically near minimum; always adjust under flow conditions if possible for accurate reading.

Q4: How is the ZDR mounted?

As a sandwich (stackable) valve between the directional control valve and the NG6 subplate (or between two sandwiches). It uses the same bolt pattern as NG6 DIN 24 340 Form E / ISO 5781. Port designation on sandwich: P=primary (high), A(or B)=reduced secondary, T=tank, Y=drain to tank.

Q5: Why specify the "Y" (external drain) version?

If the T-line (tank line in the stack) has >2-3 bar backpressure, an internally drained ZDR's set reduced pressure will be affected (increased by T-backpressure). The Y-version drains the pilot independently to tank, isolating the set pressure from T-backpressure. Use Y-version whenever T-backpressure is present.

Q6: Common faults & causes?

Reduced pressure too high / cannot be lowered: wrong spring (not /150 - e.g. /315 installed), pilot orifice clogged, knob not turned fully CCW, or upstream pressure too low to allow regulation
Reduced pressure too low / fluctuates: contaminated pilot seat, damaged O-ring on sandwich face allowing internal leakage, Y-drain line blocked (Y-version), or insufficient upstream pressure
Excessive heat / continuous flow to T: Normal in 3-way ZDR - some bypass to T occurs to hold reduced pressure; excessive heating may indicate incorrectly sized valve or stuck spool - check for contamination

Q7: Can it be used for both A- and B-side pressure reduction?

The standard ZDR6 sandwich reduces pressure in one working line (typically port A of the sandwich stack). For dual-pressure reduction (A+B independently), use two ZDR6 valves or a ZDR10 in a custom manifold. Check port marking on the sandwich face (P→A reduced, T, Y).

Q8: Fluid & seal compatibility?

NBR seals = mineral oil (HL/HLP) & HFC (water-glycol). For HEES/HETG biodegradable oils or HFD phosphate ester → specify FKM (Viton) seal variant. Maintain oil cleanliness per ISO 4406 code 18/16/13 or better.