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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
Related Part Numbers
R910990410 A A10VSO 10 DFR /52R-PPA14N00
R902427116 A A10VSO 10 DFR /52R-PSC64N00
R910993015 A A10VSO 10 DFR /52R-PUC64N00
R910988129 A A10VSO 10 DFR1/52L-PKC64N00
R902426284 A A10VSO 10 DFR1/52L-PUC64N00
R910988128 A A10VSO 10 DFR1/52R-PKC64N00
R910990987 A A10VSO 10 DFR1/52R-PPA14N00
R910990406 A A10VSO 10 DR /52R-PPA14N00
R910988127 A A10VSO 10 DRG /52R-PKC64N00
R910948228 A A10VSO 18 DFR /31L-PPA12N00
R910947943 A A10VSO 18 DFR /31R-PPA12K01
R910978578 A A10VSO 18 DFR /31R-PPA12K52
R910940520 A A10VSO 18 DFR /31R-PPA12N00
R910975818 A A10VSO 18 DFR /31R-PSA12N00
R910965968 A A10VSO 18 DFR /31R-PSC12N00
R910946939 A A10VSO 18 DFR /31R-PSC62N00
R910945007 A A10VSO 18 DFR /31R-PUC12N00
R910942213 A A10VSO 18 DFR /31R-VPA12N00
R910947944 A A10VSO 18 DFR1/31R-PPA12K01
R910999859 A A10VSO 18 DFR1/31R-PPA12K52
R910945178 A A10VSO 18 DFR1/31R-PPA12N00
R910970344 A A10VSO 18 DFR1/31R-PSC12N00
R910947182 A A10VSO 18 DFR1/31R-PSC62N00
R910960396 A A10VSO 18 DFR1/31R-PUC12N00
R902439111 A A10VSO 18 DFR1/31R-PUC12N00 E
R910938804 A A10VSO 18 DFR1/31R-PUC62N00
R910994370 A A10VSO 18 DFR1/31R-VSC12N00
R910990543 A A10VSO 18 DFR1/31R-VUC12N00
R910938446 A A10VSO 18 DR /31L-PPA12N00
R910943654 A A10VSO 18 DR /31R-PPA12K01
R910970261 A A10VSO 18 DR /31R-VKC62N00
R910947277 A A10VSO 18 DR /31R-VPA12N00
R910987917 A A10VSO 18 DR /31R-VSA12N00
R910936569 A A10VSO 18 DRG /31R-PPA12N00
R910989221 A A10VSO 18 DRG /31R-PSA12N00
R910965070 A A10VSO 18 DRG /31R-VPA12K01
R910948472 A A10VSO 18 DRG /31R-VPA12N00
R910939026 A A10VSO 28 DFLR/31R-PPA12N00
R910936062 A A10VSO 28 DFLR/31R-PPA12N00
R910906755 A A10VSO 28 DFR /31L-PPA12N00
R910904363 A A10VSO 28 DFR /31R-PPA12K01
R902417564 A A10VSO 28 DFR /31R-PPA12KB3
R910903160 A A10VSO 28 DFR /31R-PPA12N00
R910979557 A A10VSO 28 DFR /31R-PSA12N00
R910910660 A A10VSO 28 DFR /31R-VPA12N00
R910926318 A A10VSO 28 DFR1/31R-PPA12K01
R910929004 A A10VSO 28 DFR1/31R-PPA12K02
R910910590 A A10VSO 28 DFR1/31R-PPA12N00
R910946322 A A10VSO 28 DFR1/31R-PPA12N00 -SO410
R910974869 A A10VSO 28 DFR1/31R-PSA12N00
R902501926 A A10VSO 28 DG /31R-VPA12N00
R910907919 A A10VSO 28 DR /31R-PPA12K01
R910909760 A A10VSO 28 DR /31R-PPA12K02
R910907369 A A10VSO 28 DR /31R-VPA12N00
R910986352 A A10VSO 28 DRG /31L-PPA12N00
R910939601 A A10VSO 28 DRG /31R-PPA12N00
R910986796 A A10VSO 28 DRG /31R-PSA12N00
R902421254 A A10VSO 28 DRG /31R-VPA12K01
R910925052 A A10VSO 28 FHD /31R-PPA12K01
R910937599 A A10VSO 45 DFLR/31R-PPA12K01
R910940582 A A10VSO 45 DFLR/31R-PPA12N00
R910936910 A A10VSO 45 DFLR/31R-PPA12N00
R910935975 A A10VSO 45 DFLR/31R-PPA12N00
R910969633 A A10VSO 45 DFR /31L-PPA12K02
R910939119 A A10VSO 45 DFR /31L-PPA12N00
R910909613 A A10VSO 45 DFR /31R-PPA12K01
R910909281 A A10VSO 45 DFR /31R-PPA12K02
R910908268 A A10VSO 45 DFR /31R-PPA12K25
R902432094 A A10VSO 45 DFR /31R-PPA12KB2
R910939183 A A10VSO 45 DFR /31R-PPA12N00
R910920174 A A10VSO 45 DFR /31R-VPA12N00
R902480875 A A10VSO 45 DFR /31R-VSA12KB4
R910988591 A A10VSO 45 DFR1/31L-PPA12N00 -SO 32
R910908416 A A10VSO 45 DFR1/31R-PPA12K01
R910927068 A A10VSO 45 DFR1/31R-PPA12K02
R910997719 A A10VSO 45 DFR1/31R-PPA12K04
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 indie 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.
Company Details
Bronze Gleitlager
,
Bronze Sleeve Bushings
and
Graphite Plugged Bushings
from Quality China Factory
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...
