G-56
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.
Performance data
4SK90 - Check valve
Pilot-to-open, poppet type
90 L/min (24 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.
0 20 40 60 80 100
Flow - L/min
0 5 10 15 20 25
Flow - US gpm
320
240
160
80
0
22
16.5
11
5.5
0
Pressurep - psi
Pressurep - bar
Piloted open
Free ow
Pressure drop
3
1
2
Cyl (1)
Pilot (3)
Valve (2)
Ratings and specifications
Figures based on oil temperature of 40˚ C and viscosity of 32 cSt (150 SUS)
Rated flow 90 L/min (24 USgpm)
Maximum pressure 350 bar (5000 psi)
Pilot ratio 4:1
Cartrid ge material Working parts hardened and ground steel.
Zinc plated body
Mountin g position
Unrestricted
Cavity n umber A20092-T2A
Torque cartridge in to cavity 60 Nm (44 lbs. ft.)
Weight 0.39 kg (0.86 lbs.)
Seal kit number SK1093 (Nitrile)
SK1093V (Viton
®
)
Recommended Filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating temperature –30°C to +90°C (-22° to +194°F)
Leakage 0.3 ml/min n ominal (5 dpm)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E. I. DuPont
G-57
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
Model code
4SK90 - Check valve
Pilot-to-open, poppet type
90 L/min (24 USgpm) • 350 Bar (5000 psi)
Cavity
Basic code A20092-T2A
Form drill TD-2A
Form reamer TR-2A
Cartridge only
Basic code
4SK90
4SK90 4 S 3
Dimensions
mm (inch)
ote:N For applications above
210 bar (3000 psi) please consult
our technical department or use
the steel body.
Ø38.10 (1.50)
0.05
A
Thread and
all diameters
-A-
Ø33.32 (1.31)
Ø
27.43 (1.079)
27.38 (1.077)
Ø
26.24 (1.033)
26.19 (1.031)
0.00
30º
Ø
26.67 (1.050)
26.77 (1.053)
Min optional drill Ø
for socket clearance
45º
1-14UNS-2B
1. 6
(0.06)
1. 6
(0.06)
1.6 (0.06)
3
1
2
45º
R0.80
Ø17.48 (0.69)
Ø
22.28 (0.877)
22.23 (0.875)
1. 6
(0.06)
Ø
23.80 (0.937)
23.70 (0.933)
3.96
(0.16)
0.30 (0.011) x 45º max
15.88 (0.63)
Min
full thread
26.59
(1.05)
35.24 (1.387)
35.12 (1.382)
17.48
(0.69)
45.24
(1.78)
Ø15.88
(0.63)
18.26
(0.72)
5.56
(0.22)
18.26
(0.72)
min
28.57
(1.12)
Ref
Locating
shoulder
0.00
Ø9.53
(0.38)
42.0
(1.65)
21.2
(0.83)
34.9
(1.37)
27.3 (1.07)
28.6 A/F
Thread
1”-14UNS
1
2
3
L.S.
––
1 2 3 4
1
Basic code
4SK90 - Complete valve
3
Seals
S - Nitrile (for use with most
industrial hydraulic oils)
SV - Viton
(for high
temperature & most
special uid applications)
2
Pilot ratio
4 - 4:1
4
Optional pilot seal
Omit if not required