Hydraulics
C8
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Cartridge Valves — Unloading
Catalog HY14-3201/US
DAF.p65, dd, an
C
Technical Information Series DAF
Performance Curve
Specifications
Standard Orifices
General Description
The DAF series pressure sensing unloading valve is
mechanically adjustable with a remote pressure contol
port (Port X). The valve pressure ratio is fixed by
design at 100:87. Control port X is connected to a
secondary circuit which provides the unloading
pressure set point. Port Y is separately connected to
Tank.
Nominal Size 16 25 32 40
Nominal LPM 220 500 950 1400
Flow Q* (GPM) (58) (132) (251) (370)
Setting up to 70 Bar (1015 PSI),
Pressure up to 175 Bar (2538 PSI),
Ranges up to 250 Bar (3625 PSI),
up to 350 Bar (5075 PSI)
Pressure
Drop see flow curve
Maximum
Operating ports A, B, X = 350 Bar (5075 PSI)
Pressure** Y = 100 Bar (1450 PSI)
Poppet
Type C8
Mounting
Dimension according to DIN 24342
Mounting
Position any position
* at 8 Bar (116 PSI) ∆p
** Any pressure at Y port is additive to the valve setting
Orifice NG 16 NG 25 NG 32 NG 40
No. 1 Ø1.4 Ø1.5 Ø1.6 Ø1.7
M5 M5 M5 M5
No. 2 Ø0.9 Ø1.0 Ø1.1 Ø1.2
1/16* 1/16* 1/16* 1/16*
No. 3 Ø1.5 Ø1.6 Ø1.7 Ø1.8
M5 M6 M6 M6
Orifice diameter in mm
*Thread type in NPT
A
B
Y
X
C
1
3
2
B
A
X
X
Y
B
A
2
1
3
0
0
100 15050
58 4
116 8
174
12
232
PSI
16
Bar
Q(%)
nom
Pressure Drop p∆
Minimum Pressure
(Minimum Setting)
Pressure Override
0 25 50 75 100
Nominal Volume Flow (%)
0
1450
725
100
50
2175 150
2900
200
3625 250
4350
5075
PSI
300
350
Bar
Pressure p
Hydraulics
C9
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Cartridge Valves — Unloading
Catalog HY14-3201/US
DAF.p65, dd, an
C
Dimensions Series DAF
Nominal Size 16 25 32 40
H 84 (3.31) 88 (3.46) 93 (3.66) 103 (4.06)
b1 79 (3.11)** 85 (3.35) 102 (4.02) 125 (4.92)
d1 H7 32 (1.26) 45 (1.77) 60 (2.36) 75 (2.95)
d2 H7 25 (0.98) 34 (1.34) 45 (1.77) 55 (2.17)
t2 +0.1 56 (2.20) 72 (2.83) 85 (3.35) 105 (4.13)
Lv 2* 146 (5.75) 141 (5.55) 149 (5.87) 161 (6.34)
Lv 5* 147 (5.79) 142 (5.59) 150 (5.91) 162 (6.38)
Lv 9* 160 (6.30) 155 (6.10) 163 (6.42) 175 (6.89)
Lv 61* 192 (7.56) 187 (7.36) 195 (7.68) 207 (8.15)
*See ordering information: adjustment type
**Width 65mm (2.56 in)
Inch equivalents for millimeter dimensions are shown in (**)
Dimensional drawing corresponds to cartridge valve of series: DAF - NG 16 to NG 40
4
3
2
39.5
(1.56)
L
v2
v5
v9
v61
X
Y
t2
B
A
H
1
0
9
b1
∅ d2
∅ d1
Hydraulics
C10
Parker Hannifin Corporation
Hydraulic Valve Division
Elyria, Ohio 44035 USA
Cartridge Valves — Unloading
Catalog HY14-3201/US
DAF.p65, dd, an
C
Ordering Information Series DAF
Nominal
Size
Pressure
Range
Pressure
Relief
Valve
Serial
Letter*
Design
Series
Poppet
Type
C8
Adjustment
Type
Seals Insert
Cartridge
Valve
8DAF E
*Valves already in the market may contain a different
serial letter. As far as dimensions and technical aspects
are concerned, they are identical and can be inter-
changed. Please keep this in mind when identifying the
products.
Seal Kits
Nominal Compound: Compound:
Size Nitrile Fluorocarbon
16 SK-DAFE10E16 SK-DAFE10E16V
25 SK-DAFE10E25 SK-DAFE10E25V
32 SK-DAFE10E32 SK-DAFE10E32V
40 SK-DAFE10E40 SK-DAFE10E40V
Code Description
Omit Nitrile
V Fluorocarbon
10
B
Code Size
16 16
25 25
32 32
40 40
Code Description
2 Hexagon socket
screw with locknut
5 Knob with ratchet
9 Same as Code 2,
with nut cover cap
61 Knob with E10 lock
Accessories
Weight
No
minal Size 16 25 32 40
Weight kgs 2.2 3.5 4.8 8.0
(lbs) ( 4.9) (7.7) (10.6) (17.6)
Code Description
B Adjustable up to 70 Bar (1015 PSI)
E Adjustable up to 175 Bar (2538 PSI)
G Adjustable up to 250 Bar (3625 PSI)
K Adjustable up to 350 Bar (5075 PSI)
Bolt Kits
Nominal Bolt Part Torque
Size Dimensions Number Nm
16 (4) M8 x 40 BK414 33 Nm
(4) 5/16-18 x 1.5 BK84 24 ft-lbs
25 (4) M12 x 50 BK391 115 Nm
(4) 1/2-13 x 2.0 BK77 84 ft-lbs
32 (4) M16 x 55 BK415 281 Nm
(4) 5/8-11 x 2.25 BK85 207 ft-lbs
40 (4) M20 x 70 BK416 553 Nm
(4) 3/4-10 x 2.75 BK87 408 ft-lbs
