G-54
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
Pressure on the valve port
2 causes the poppet to lift
against the spring force,
allowing the ow to the
cylinder port 1. Reverse ow
is prevented by the poppet
reseating. Pressure applied to
the pilot port 3 will overcome
the cylinder port pressure
and lift the poppet from its
seat, allowing ow from the
cylinder to valve port.
Features
Hardened and ground poppet
gives excellent ow capability
for valve size, positive
sealing and long working
life. Cartridge construction
allows installation in actuators,
manifold blocks and Hydraulic
Integrated Circuits. Fits the
same cavity as the overcenter
valves of a similar size.
Pressure drop
Performance data
4SK30 - Check valve
Pilot-to-open, poppet type
30 L/min (8 USgpm) • 350 bar (5000 psi)
Sectional view
Description
Pilot check valves allow ow
to pass in one direction, with
a low pressure drop, then
prevent reverse ow until pilot
pressure is applied. There
are many applications for this
valve type, the most common
being to lock and hold a
cylinder, or another hydraulic
actuator, in position.
These valves are ideally
suited for tting directly into
a cylinder, giving economy of
installation, direct control of
cylinder movement and ease
of servicing.
Flow - L/min
Flow - US gpm
0 2.5 5.0 7.5 10 12
0 10 20 30 40 50
350
300
250
200
150
100
50
0
24.5
21
17.5
14
10.5
7
3.5
0
Free ow
Piloted open
Pressurep - psi
Pressure - bar
Pilot (3)
Valve (2)
Cyl (1)
3
1
2
Ratings and specifications
Figures based on oil temperature of 40˚ C and viscosity of 32 cSt (150 SUS)
Rated flow 30 L/min (8 USgpm)
Maximum pressure 350 bar (5000 psi)
Pilot ratio 3:1 and 5:1
Cartrid ge material Working parts hardened and ground steel.
Zinc plated body.
Mountin g position
Unrestricted
Cavity n umber A20090-T11A
Torque cartridge in to cavity 45 Nm (33 lbs ft.)
Weight 0.18 kg (0.39 lbs)
Seal kit number SK1079
SK1079V
(Nitrile)
(Viton
®
)
Recommended Filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating temperature –30° to +90° C (-22° to +194°F)
Leakage 0.3 ml/min n ominal
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E. I. DuPont
G-55
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
30.0
(1.18)
19.0
(0.75)
34.8
(1.37)
21.8 (0.86)
22.2 A/F
M20 x 1.5
thread
L.S.
3
2
1
1
Basic code
4SK30 - Complete valve
Model code
3
Seals
S - Nitrile (for use with most
industrial hydraulic oils)
SV - Viton
(for high
temperature & most
special uid applications)
2
Pilot ratio
3 - 3:1
5 - 5:1
4
Optional pilot seal
Omit if not required
4SK30 - Check valve
Pilot-to-open, poppet type
30 L/min (8 USgpm) • 350 bar (5000 psi)
Cartridge only
Basic code
4SK30
4SK30 3 S 3
Cavity
Basic code A20090-T11A
Form Drill TD-11A
Form Reamer TR11A
Dimensions
mm (inch)
––
0.05
A
-A-
Ø31.75 (1.25)
Ø25.40 (1.00)
21.87 (0.861)
21.82 (0.859)
Ø
20.68 (0.814)
20.63 (0.812)
Ø
Min optional drill Ø
for socket clearance
1. 6
(0.06)
1. 6
(0.06)
1. 6
(0.06)
1
3
2
M20 x 1.5-6H
30º
45º
0.00
0.00
0.00
21.11 (0.831)
21.21 (0.835)
Ø
45º
Location
shoulder
3.96
(0.16)
12.70
(0.50)
min full
thread
27.38
(1.08)
18.31
(0.72)
35.18
(1.385)
35.05
(1.379)
41.28
(1.62)
23.83
(0.94)
Ref
Thread and
all diameters
R0.50
0.25 (0.01) x 45º max
R0.50
Ø13.49 (0.53)
18.64 (0.733)
18.54 (0.729)
Ø
17.50 (0.688)
17.45 (0.687)
Ø
Ø17.48
(0.69)
Ø10.72
(0.42)
18.26
(0.72)
5.56
(0.22)
17.48
(0.69)
min
depth
1 2 3 4