0451
-Sandwichplatestructure
-
PortingpatterntoDIN24340formA,andISO4401
-4pressureratings
-3adjustmentelements
·Rotaryknob
·Adjustableboltwithprotectivecap
·Lockablerotaryknob
-Pressuregaugeconnection
-Checkvalveoptional
Size6
upto210bar
upto30L/min
Type ZDR6D...30
FeaturesContents
Pressure Reducing Valve
Direct Operated
01/06
3.17
Functionandcon󼴩gurations 02
Symbols 02
Orderingcode 03
Technicaldata 03
Characteristiccurves 04
Unitdimensions 05
Hengli hydraulic ｜ Hydraulic components
/06
0452
03
02
3 7
6
5
1
8
2
4
A1 T1 P1 B1
A2 T2 P2 B2
P A B T
M
2
1
P A B T
M
2
1
P A B T
2
1
M
Y
Y
Y
△
△
△ △
△
△
△ △
Pressure valves ｜ Type ZDR6D...30
PressurereducingvalvestypeZDR6D..are3-waydirectoperated,sandwichplatedesignwithapressure
reducingfunctiononthesecondaryside.Itisusedtoreducethesystempressure.Thepressurereducing
valvebasicallyconsistsofthehousing(1),thecontrolspool(2),twocompressionsprings(3)andthe
adjustmentelement(4)aswellaswithanoptionalcheckvalve.
Atstaticstate,thevalveisnormallyopen,and󼴪uidcan󼴪owfreelyfromportP2toportP1(version"DP")
orfromportA1toportA2(version"DA").PressureinportP1actsatthespoolareathroughthecontrol
line(5)andisbalancedwiththesettingvalueofthecompressionspring(3).
WhenthepressureinportP1exceedsthesettingvalueofthespring(3),thecontrolspool(2)moves
furthertowardsthecompressionspring(3),theopeningapertureatportPisgettingsmalleruntil󼴪uid
atportP1󼴪owsbacktotankthroughthetheori󼴩ce(6)ofthecontrolspool(2)topreventanyfurtherrise
inpressure.Theleakageoilinspringchamber(7)isalwaysdrainedtotankthroughtheportT(Y).
Acheckvalvecanbe󼴩ttedoptionallyinversion"DA"forfree󼴪owfromportsA2toportsA1.
Apressuregaugeconnection(8)permitsthesecondarypressuretobemonitored.
Type ZDR6DP1-30/...
Note: Becausethereisinternalleakage,whensandwichplatepressurereducingvalveisusedin
pairswithsandwichpilotoperatedcheckvalve,pressurereducingvalvemustbe󼴩xedbetween
thecheckvalveanddirectionalcontrolvalve.
Symbols
( ①=valveside②=sub-plateside)
Type ZDR6DA ...30/...YM Type ZDR6DA...30/...Y Type ZDR6DP...30/...YM
Function and con󼴩guration
0453
/06
03
Hydraulic components ｜ Hengli hydraulic
03
Pressure valves ｜ Type ZDR6D...30
Ordering code
Technical data
/
30
DRZ D6
*
Pressurereducingvalve=DR
Sandwichplate=Z
Furtherdetailsin
cleartext
Size6=6
Series30=30
Directoperated=D
Nocode=
Metricthread(M14×1.5)
-1=Gthread(G1/4)
Nocode=NBRseals
V=FKMseals
Nocode=Withcheckvalve
(OnlyforversionDA)
M=Withoutcheckvalve
Y=Pilotoilsupplyinternal
anddrainexternal
2.5=Max.secondarypressure25bar
7.5=Max.secondarypressure75bar
15=Max.secondarypressure150bar
21=Max.secondarypressure210bar
PressurereductioninportA2=A
PressurereductioninportP1=P
Rotaryknob=1
Adjustableboltwithprotectivecap=2
Lockablerotaryknob=3
Fluid
MineraloilsuitableforNBRandFKMseal
PhosphateesterforFKMseal
Fluidtemperaturerange ℃
-30to+80(NBRseal)
-20to+80(FKMseal)
Viscosityrange mm
2
/s 10to800
Degreeofcontamination
Maximumpermissibledegreeof󼴪uidcontamination:
Class9.NAS1638or20/18/15,ISO4406
Max.operatingpressure
(inlet)
bar 315
Max.secondarypressure
(output)
bar 25;75;150;210
Backpressure bar 60
Max.󼴪ow-rate L/min 30
Weight Kg Approx.1.2
Y
Hengli hydraulic ｜ Hydraulic components
/06
0454
03
04
Pressure valves ｜ Type ZDR6D...30
Pressure range (bar)
Secondary pressure (bar)→
240
200
120
160
80
40
01020 10 20 30
25
75
150
210
01020 10 20 30
25
75
150
210
P1 to T (Y) P2 to P1
A1 to T (Y) A1 to A2
Pressure range (bar)
Secondary pressure (bar)→
Flow (L/min)→Flow (L/min)→
240
200
120
160
80
40
6
4
2
0 2 4 6 8 9
6
4
2
0 2 4 6 8 10
Flow (L/min)→ Flow (L/min)→
Secondary pressure
(outlet) increment (bar)→
Secondary pressure
(outlet) increment (bar)→
25
20
15
10
5
5 100 15 20 25 30
≤1MPa
≥1MPa
Flow (L/min)→
Pressure differential (bar)→
Characteristic curves
(Measuredat
ϑ
oil
=40℃ ±5℃ ,usingHLP46)
Note:
Thecurvecharacteristics
remaininacertain
pressurerangewithalow
settingpressure.
Type ZDR6DP ...30/...
Type ZDR6DP ...30/...
Type ZDR6DA...30/...
Type ZDR6DA...30/...
Example:
IfthepressureofportA2orP1issettingto30bar
underthe󼴪owof10L/min,whenthesecondary
pressureincreasesto36bar,the󼴪ow-rate
reducesandtrendstozero.
0455
/06
03
Hydraulic components ｜ Hengli hydraulic
05
Pressure valves ｜ Type ZDR6D...30
4 5
8
7
2
61
10
9
3
T
A B
P
Valve fixing holes
T
A B
P
Dimensions of
mounting surface
Requirement for
mounting surface
0.01/100
0.8
10.3
40.5
27.8
19
31
4×Φ7.6max
16.25
5.95
0.75
32.5
4×M5;10
26.55
L2
14max
SW19
Φ60
32.5
4×Φ5.4
40.5
SW30
L1
31
44
L3
14.5
12.5
14max
SW24
SW6
SW19
SW30
28
20
M14×1.5
（G1/4）
Φ60
40
5
Unit dimensions
(Dimensionsinmm)
Valve 󼴩xing screws:
M5internalhexagonscrewor
LT30.02double-screwbolt
addedLT30.01nutGB/T70.1-10.9,
thelengthaccordingtosandwich,
tighteningtorqueM
A
=8.9Nm
mustbeorderedseparately.
1Nameplate
2Adjustmentelement"1"
3Adjustmentelement"2"
4Adjustmentelement"3"
5Sleevewithscale
6Pressuregaugeconnection
M14×1.5(G1/4),12deep
7Adjustablestroke
8Spacerequiredtomoveoutthekey
9Valve󼴩xingholes
10O-rings9.25×1.78(PortA,B,PandT)
Type Max.L1 L2 Max.L3
DA 208 182 203
DP 196 170 191
Hengli hydraulic ｜ Hydraulic components
/06
0456
03
06
Pressure valves ｜ Type ZDR6D...30
©Thisbrochurecanbereproduced,edited,reproducedor
transmittedelectronicallywithouttheauthorizationofHengli
HydraulicCompany.Duetothecontinuousdevelopmentof
theproduct,theinformationinthisbrochureisnotspeci󼴩cto
thespeci󼴩cconditionsorapplicabilityoftheindustry,thus,
Henglidoesnottakeanyresponsibilityforanyincompleteor
inaccuratedescription.
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