G-46
G
Where measurements are critical request certied drawings. We reserve the right to change specications without notice.
Eaton Hydraulic Screw-in Cartridge Valves (SiCV) E-VLSC-MC001
-E—January 20
18 www.eaton.com
3
1
2
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
4CKD90 - Check valve
Pilot-to-open, poppet type with decompression stage
90 L/min (24 USgpm) • 420 bar (6000 psi)
Description
A decompression pilot check
can be used in most applications
that use a standard pilot
operated check. Free ow in
one direction and load holding in
the other. The decompression
feature allows locked-in
pressure to decay in a controlled
fashion, reducing hydraulic noise
and instability caused by the
rapid loss of energy from the
actuator. The valve is effective
in clamping circuits and when
used with intensiers or when
there are high load induced
pressures.
Operation
The ball and poppet are held
onto their respective seats by
spring force, ensuring positive
sealing as long as the pressure
on port 1 is equal to or greater
than the pressure on port 2.
As soon as the pressure on
port 2 exceeds the pressure
on port 1 plus the spring force,
the valve opens from 2 to 1. In
order to pass ow in the reverse
direction, pilot pressure must
be applied to port 3. Once this
reaches the required level, the
pilot piston acting on the pin in
the Center of the poppet lifts the
ball off its seat, enabling
the uid to decompress and
thus reducing the load pressure
acting on port 1. As the load
pressure decreases, the pilot
pressure required to open the
main stage also decreases and
when the correct pilot pressure
is reached, the main stage
poppet is lifted off its seat by the
advancing pilot piston, allowing
full ow from 1 to 2.
When calculating the
pilot pressure, it must be
remembered that any back
pressure on port 2 will cause
this to increase on a 1:1 ratio.
Features
Decompression stage reduces
hydraulic noise on rapid loss
of pressure. Precision ground
ball and hardened and ground
poppet ensure positive sealing
and long, trouble-free working
life.
This valve is directly
interchangeable with the 4CK90
check valve and 1CE*90 series
overcenter valve.
Pressure drop
Performance data
Sectional view
Pilot
(3)
Valve
(2)
Cyl (1)
Ratings and specifications
Figures based on: Oil Temp = 40° C Viscosity = 32 cSt (150 SUS)
Rated flow 90 L/min (24 USgpm)
Max pressure Cylinder Port 1 420 bar (6000 psi)
Ports 2 & 3 350 bar ( 5000 psi)
Pilot ratio 25:1 decompression stage
3: main stage
Cartridge material Working parts hardened and ground steel.
Electroless nickel plated body.
Standard Housing Material Standard aluminium (up to 210 bar*).
Add suffix "377" for steel option.
Mountin g position Unrestricted
Cavity n umber A12336
Torque cartridge into cavity 90 Nm (66 lbs ft)
Weight 0.243 kg (0.54 lbs)
Seal kit number SK986 (Nitrile) SK986V (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