4-23
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
Characteristics
The pilot-operated pressure relief valves series DSDU
limit the system pressure by opening the pressure port to
the tank. Valves of this design series have a flat p/Q curve.
They are mostly used for accumulator pressure relief. In
this case the valve is set and sealed by TÜV (German
Technical Monitoring Association). The valve delivery
includes a copy of the TÜV certificate.
Features
• TÜV certificate
• 2 interfaces
- subplate mounting acc. to ISO 6264
- slip-in, mounting acc. to ISO 7368
• Flat p/Q curve
• Remote control via port X
DSDU*E
DSDU*P20
DSDU*P20DSDU*E*
Other TÜV approved pressure relief valves on request.
4-24
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
Ordering Code / Technical Data
Ordering code
General
Size P20 E16 E25 E32
Interface Subplate mounting Slip-in mounting
acc. to ISO 6264 DIN ISO 7368
Mounting position as desired, horizontal mounting prefered
Ambient temperature [°C] -20...+80
Weight [kg] 4.5 2.2 3.5 4.9
Hydraulics
Operating pressure [bar] Ports A and X up to 350, B and Y depressurized
Pilot Internal / internal External / external
Adjustment pressure [bar] See ordering code
Nominal flow [l/min] See ordering code
Pressure medium Hydraulic oil according to DIN 51524 ... 525
Permitted contamination ISO 4406 (1999), 18/16/13
Viscosity, recommended [mm²/s] 30 ... 50
maximum [mm²/s] 12 ... 230
Pressure medium temperature
recommended [°C] 30 ... 50
maximum [°C] -5 ... +80
Technical data
Ordering Examples
DSDU 1078 E32 E - 120bar matches Q
max
550 l/min, opening pressure 120bar
DSDU 1078 E32 E - 150bar matches Q
max
640 l/min, opening pressure 150bar
Code Seals
omit NBR
V FPM
Seals
Pressure
limiting
valve
Desired
opening
pressure
in bar
(please
specify)
DSDU
Type
code
Pressure
stage
TÜV
Type Code
578 P20 1078 E16 1078 E25 1078 E32
Q
max [l/min] depending. on opening press.
220 150 215 500
240 165 235 550
265 190 280 640
300 215 310 750
320 230 355 800
345 255 390 900
370 280 400 950
Opening
pressure ranges
[bar]
50 - 75
76 - 125
126 - 175
176 - 200
201 - 250
251 - 300
301 - 350
Pressure
stage
B
E
G
K
4-25
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
p/Q curves
p/Q Curves
4-26
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
DSDU*P20
Dimensions
Mounting pattern ISO 6264-08-11-*-97
Size NBR FPM
P20 BK-M10x40-4pcs 65Nm SK-DSDU5P20 SK-DSDU5P20V
Bolt kit DIN912 12.9
Tolerance at pin holes and screw holes ±0.1, at port holes ±0.2.
4-27
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
Dimensions
DSDU*E*
Size H H
1
BL
E16 140 84 79* 142
E25 160 88 85 135
E32 178 93 102 143
Mounting NG NBR FPM
16 BK-M8x50-4pcs 33Nm SK-DSDU10-E16 SK-DSDU10-E16V
Slip-in 25 BK-M12x50-4pcs 115Nm SK-DSDU10-E25 SK-DSDU10-E25V
32 BK-M16x55-4pcs 281Nm SK-DSDU10-E32 SK-DSDU10-E32V
Bolt kit DIN912 12.9
4-28
DSDU.PMD RH
Catalogue HY11-2500/UK
Pilot-Operated Pressure Relief Valve
Series DSDU
4
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
Dimensions
NG b1 d1 H7 d2 H7 d3 d3 max d4 d4 max* d5 max d6 d7 H13 m1±0.2 m2±0.2 m3±0.2
16 65 32 25 16 18 16 25 4 M 8 4 46 25 23
25 85 45 34 25 25.5 25 32 6 M 12 6 58 33 29
32 102 60 45 32 36 32 40 8 M 16 6 70 41 35
NG m4±0.2 t1+0.1 t2+0.1 t3 t4 t4 max* t15 t6 t7 t8 t10 U W
16 10.5 43 56 11 34 29.5 20 20 2 2 10 0.03 0.05
25 16 58 72 12 44 40.5 30 25 2.5 2.5 10 0.03 0.05
32 17 70 85 13 52 48.0 30 35 2.5 2.5 10 0.03 0.1
Mounting dimensions
Surface finish:
= R
max
16, =
√
1
2
√
R
max
8
Comparison DIN NG to ISO code
DIN NG ISO code
16 7368-BA-06-2-B
25 7368-BB-08-2-B
32 7368-BC-09-2-B
