G-50
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
4CK300 - Check valve
Pilot-to-open, poppet type
300 L/min (80 USgpm) • 350 bar (5000 psi)
Description
Pilot check valves allow flow
to pass in one direction, with a
low pressure drop, then prevent
reverse flow 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 fitting 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
flow to the cylinder port 1.
Reverse flow 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 flow 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
348.0
304.5
261.0
217.5
174.0
130.5
87.0
43.5
0
24
21
18
15
12
9
6
3
0
0 50 100 150 200 250 300 350 400
0 25 50 75 100
Pilot open
Free ow
3
1
2
Ratings and specifications
Figures based on oil temp of 40° C and viscosity of 32 cSt (150 SUS)
Rated flow 300 L/min (80 USgpm)
Max pressure 350 bar (5000 psi)
Pilot ratio 3:1
Cartridge material Working parts hardened and ground steel.
Zinc ni ckel plated body.
Standard housing material Standard aluminium (up to 210 bar).
Add suffix “377” for steel option.
Mountin g position Unrestricted
Cavity n umber A 6935 (See Section M)
Torque cartridge into cavity 150 Nm (11 0 lbs ft)
Weight 4CK300
4CK350
4CKK350
0.28 kg (0.62 lbs)
1.15 kg (2.54 lbs)
1.96 kg (4.32 lbs)
Seal kit number
SK683 (Nitrile)
SK683V (Viton
®
)
Recommended filtration level BS5540/4 C lass 18/13 (25 micron nominal)
Operating temperature -30°C to +90°C (-22° to +194°F)
Leakage 0.5 milliliters/min nominal (5 dpm)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E.I. DuPont
G-51
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
4CK300 - Cartridge Only
4CK350 - Cartridge and Body
4CKK350 - Cartridges and
Dual Body
2
Pilot port size
1 - Internal
4CK**** 1 10W S 3
4CK300 - Check valve
Pilot-to-open, poppet type
300 L/min (80 USgpm) • 350 bar (5000 psi)
Model code
3
Port sizes
1 2 3 4 5
Dimensions
mm (inch)
Cartridge only
Basic code
4CK300
Single valve
1 1/4" Ports
Basic code
4CK350
4
Seals
S - Nitrile (For use with most
industrial hydraulic oils)
SV - Viton (For high
temperature and most
special uid applications)
5
Optional pilot seal
Omit if not required
Dual valve
1 1/4" Ports
Basic code 4CKK350
Internally Cross Piloted
ote:N For applications above
210 bar (3000 psi) please consult
our technical department or use
the steel body.
33.0
(1.30)
max
69.5
(2.74)
47.8 A/F
1-5/8-12 UN-2A
Pilot (3)
Valve (2)
Cyl (1)
23.5
(0.93)
2 holes Ø10.5 (0.41) thro’
101.6
(4.00)
31.8 (1.25)
63.5
(2.50)
2
3
1
80.0
(3.15)
10.5
(0.41)
49.0
(1.90)
135.0
(5.31)
max
8.5 (0.33)
80.0 (3.15)
97.0 (3.82)
80.00
(3.15)
2 holes Ø11.0
(0.43) thro’
8.5
(0.33)
80.00
(3.15)
11.0
(0.43)
97.0 (3.82)
57. 0
(2.24)
135.0
(5.31)
max
V1
C2
C1
V2
101.6
(4.00)
49.0
(1.90)
127.0 (5.00)
95.0 (3.74)
32.0 (1.26)
––
2
1
1 2
Code Port size Housing number - body only
Aluminium
single
Steel
single
Aluminium
double
Steel
double
10W 1 1/4” BSP 1/4” BSP Pilot Port B6814 B8610 C8704C8705
20T 1 1/4” SAE 1/4” SAE Pilot Port B10630 B11474 C10811 C11564