G-64
G
Where measurements are critical request certied drawings. We reserve the right to change specications without notice.
Eaton Hydraulic Screw-in Cartridge Valves (SiCV) E-VLSC-MC001
-E—January 20
18 www.eaton.com
Operation
In free ow direction, ow
through inlet unseats the
poppet and ows out of
the cylinder port. When the
control valve is centered the
load is locked. When pilot
pressure is applied the piston
unseats the small poppet in
the center of
the main poppet. Flow
through this small seat area
lowers the load or locked
pressure (decompression
stage). With load pressure
reduced the main poppet
is then piloted fully open
allowing reverse ow.
Features
Decompression feature
for low pilot pressure
requirements and to reduce
hydraulic noise on rapid loss of
pressure.
Pressure drop
Performance data
4KD25 - Check valve
Pilot-to-open with decompression stage
25 L/min (6 USgpm) • 700 bar (10000 psi)
Sectional view
Description
Used to lock a cylinder or
part of a circuit and prevent
reverse ow until pilot
pressure is applied. For use
in high pressure, low ow
circuits and circuits requiring
decompression. Can be used
in conjunction with the 1T16
pressure intensier. See
page J-42.
3
1
2
Pilot
(3)
Cyl
(1)
Valve
(2)
Flow - US gpm
Flow - L/min
Pressure - psi
Pressure - bar
116
87
58
29
0
8
6
4
2
0
0 5 10 15 20 25
0 1.3 2.6 3.9 5.2 6.5
Free ow
Piloted open
Ratings and specifications
Figures based on oil temperature of 40˚ C and viscosity of 32 cSt (150 SUS)
Rated flow 25 L/min (6 USgpm)
Maximum pressure 700 bar (10000 psi) Cylinder Port
140 bar (2000 psi) Pilot Port
Pilot ratio 25:1 Decompression
4:1 Full Flow
Body material
Steel
Mountin g position
Lin e mounted
Weight 0.8 kg (1.8 lbs.)
Seal kit number SK1060 (Nitrile)
SK1060V (Viton
®
)
Recommended filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating temperature –30° to +90° C (-22° to +194°F)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E. I. DuPont
G-65
G
Where measurements are critical request certied drawings. We reserve the right to change specications without notice.
Eaton Hydraulic Screw-in Cartridge Valves (SiCV) E-VLSC-MC001
-E—January 20
18 www.eaton.com
1
Basic code
4KD25 - Complete valve
Model code
4KD25 - Check valve
Pilot-to-open with decompression stage
25 L/min (6 USgpm) • 700 bar (10000 psi)
4KD25 N 2W S
3
2
Adjustment means
N - Fixed
3
Port sizes - bodied
valves only
2W - 1/4" BSP
4
Seals
S - Nitrile (for use with most
industrial hydraulic oils)
SV - Viton
(for high
temperature and most
special uid applications)
5
'O' Ring on
pilot piston
3 - Standard
Omit if not required
Complete valve
1/4" Ports
Basic code
4KD25
Dimensions
mm (inch)
––
8.0
(0.31)
2 holes Ø9.0
(0.35) thro’
1
3
2
57. 0
(2.24)
8.0
(0.31)
60.0 (2.36)
27.5 (1.08)
37.0 (1.46)
63.0 (2.48)
76.2 (3.00)
12.7 (0.5)
28.5
(1.1
2)
1 2 3 4 5