G-48
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
3
1
2
4CK120 - Check valve
Pilot-to-open, poppet type
120 L/min (32 USgpm) • 350 bar (5000 psi)
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.
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
Sectional view
Pilot
(3)
Valve
(2)
Cyl (1)
Flow - US gpm
Flow - L/min
Pressure - psi
Pressure - bar
145
116
87
58
29
0
10
8
6
4
2
0
0 30 60 90 120 150
0 8 16 24 32 40
Piloted open
Free ow
Optional external
pilot post
Ratings and specifications
Figures based on: Oil Temp = 40° C Viscosity = 32 cSt (150 SUS)
Rated flow 120 L/min (32 USgpm)
Max pressure 350 bar (5000 psi)
Pilot ratio 3:1
Cartridge material Working parts hardened and ground steel.
Zinc plated body.
Standard housing material Standard aluminium (up to 210 bar).
Add suffix “377” for steel option.
Mountin g position Unrestricted
Cavity n umber A877 (See Section M)
Torque cartridge into cavity 100 Nm (74 lbs ft)
Weight 4CK120
4CK125
4CKK125
0.28 kg (0.62 lbs)
1.15 kg (2.54 lbs)
1.96 kg (4.32 lbs)
Seal kit number SK381 (Nitrile) SK381V (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 milliliters/min nominal (5 dpm)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E.I. DuPont
G-49
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
Dimensions
mm (inch)
Cartridge only
Basic code
4CK120
4CK**** 1 6W S 3
4CK120 - Check valve
Pilot-to-open, poppet type
120 L/min (32 USgpm) • 350 bar (5000 psi)
Model code
2
Pilot port sizes
3
Port sizes - bodied valves only
4
Seals
S - Nitrile (For use with most
industrial hydraulic oils)
SV - Viton (For high
temperature and mos
special uid applications)
5
Optional pilot seal
Omit if not required
Complete valve
3/4", 1/2" Ports
Basic code 4CK125
1
Basic code
4CK120 - Cartridge Only
4CK125 - Cartridge and Body
4CKK125 - Cartridges and
Dual Body
Complete valve
3/4" Ports
Basic code 4CKK125
Internally cross piloted
ote:N For applications above
210 bar (3000 psi) please consult
our technical department or use
the steel body.
15.0
(0.59)
max
55.5
(2.19)
38.1 A/F
1-5/16-12 UN-2A
Pilot (3)
Valve (2)
Cyl (1)
101.6
(4.00)
2 holes Ø10.5 (0.41) thro’
37.0
(1.46)
25.4
(1.00)
50.8
(2.00)
3
2
1
117.0
(4.60)
max
10.6
(0.42)
76.0
(2.99)
83.0 (3.27)
44.0
(1.73)
13.0
(0.51)
112.0
(4.41)
2 holes
Ø9.0
(0.35)
thro’
76.2
(3.00)
8.0
(0.31)
50.0
(1.97)
V1
C2
C1
V2
51. 6
(2.03)
127.0
(5.00)
max
92.0
(3.62)
37.0
(1.46)
20.6 (0.81)
82.6 (3.25)
101.6 (4.00)
––
2
1
1 2
1 2 53 4
Code Port size
1 In ternal
2W 1/4" BSP (External Pilot). Omit for bodied valves
4T 1/4" SAE (External Pilot). Omit for bodied valves
Code Port size Housing number - body only
Aluminium
single
Steel
single
Aluminium
double
Steel
double
6W 3/4” BSP 1/4” BSP Pilot Port B6898B5544 C2543 C1200
12T 3/4” SAE 1/4” SAE Pilot Port B8200 C10629 C16434
16T 1” SAE 1/4” SAE Pilot Port B10708B11814