EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-100.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Ratings and Specifications
Figures based on: Oil Temp = 40° C Viscosity = 32 cSt (150 SUS)
Rated flow 20 L/min (5 USgpm)
Max relief pressure 350 bar (5000 psi)
Max load induced pressure 270 bar (4000 psi)
Cartridge material Working parts hardened and ground steel.
External surfaces zinc plated.
Standard housing material Aluminum (up to 210 bar).
Add suffix “377” for steel option.
Mounting position Unrestricted
Cavity number A22903 (See Section M)
Torque cartridge into cavity 40 Nm (30 lbs ft)
Weight 1CE20 0.16 kg (0.35 lbs)
1CE25 0.37 kg (0.82 lbs)
1CEE24 0.41 kg (0.89 lbs)
Seal kit number SK1276 (Nitrile)
SK1276V (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
1CE20 - Overcenter Valve
Pilot assisted relief with check
-NJO64HQNtCBSQTJ
Description
Overcenter valves give static
and dynamic control of loads
by regulating the flow into and
out of hydraulic actuators. When
installed close to or within an
actuator, the overcenter valve
will stop runaway in the event
of hose burst and if open
center directional control valves
are used, will allow thermal
expansion relief of the hydraulic
fluid.
The overcenter cartridge is
ideal for mounting directly into
a cavity machined in the body
of the cylinder, motor or rotary
actuator. The cartridge can also
be mounted directly to the
ports via a specifically machined
body as part of a Hydraulic
Integrated Circuit or single unit,
or contained within one of our
standard line bodies.
Single overcenter valves are
normally used when the load
is unidirectional, for example
an aerial platform or crane
and dual overcenter valves
are used for controlling loads
in both directional for motor
applications or for cylinders
going over center.
Operation
The check section allows
free flow into the actuator
then holds and locks the load
against movement. The pilot
assisted relief valve section
will give controlled movement
when pilot pressure is applied.
The relief section is normally
set to open at a pressure at
least 1.3 times the maximum
load induced pressure but the
pressure required to open the
valve and allow movement
depends on the pilot ratio of the
valve. For optimization of load
control and energy usage, a
choice of pilot ratios is available.
The pressure required to open
the valve and start actuator
movement can be calculated as
follows:
Pilot Pressure =
(Relief Setting) - (Load Pressure)
Pilot Ratio
Features
Cartridge is economical and fits
simple cavity. Allows quick, easy
field service - reduces down
time. Interchangeable with pilot
check valve of a similar size.
Pilot Ratio
3:1 Best suited for extremely
unstable applications such
as long booms or flexible
frameworks.
4.5:1 Best suited for applications
where load varies and machine
structure can induce instability.
8:1 Best suited for applications
where the load remains
relatively constant.
Pressure Drop
Performance Data
Sectional View
750
600
450
300
150
0
Flow - L/min
Pressure - psi
Pressure - bar
Flow - US gpm
50
40
30
20
10
0
0 2.5 5 7.5 10
0 10 20 30 40
Free ow
Pilot
open
Pilot (3)
Valve (2)
Cyl (1)
3
1
2
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-101.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Dimensions
mm (inch)
1CE20 - Overcenter Valve
Pilot assisted relief with check
-NJO64HQNtCBSQTJ
Model Code
3 Port Sizes
1CE*** F 3W 35 S 3
1 2 3 4 5 6
1 Basic Code
1CE20 - Cartridge Only
1CE25 - Cartridge and Body
1CEE24 - Cartridges and
Dual Body
2 Adjustment Means
F - Screw Adjustment
For xed versions add setting in 10
bar increments to end of part number.
Subject to a ±10% tolerance.
4
Pressure Range
@ 4.8 L/min
Note: Code based on pressure
in bar.
20 - 100-230 bar.
Std setting 140 bar
35 - 200-350 bar.
Std setting 210 bar
Std setting made at 4.8 L/min
Other pressure ranges available on
request
5
Seals
S - Nitrile (For use with
most industrial
hydraulic oils)
SV - Viton (For high
temperature and most
special uid applications)
6
Pilot Ratio
3 - 3:1
4 - 4.5.1
8 - 8:1
Cartridge Only
Basic Code
1CE20
Single Valve
3/8" Ports
Basic Code 1CE25
Note: Tightening torque
of “F” adjuster locknut -
20 to 25 Nm.
Code Port Size Housing Number - Body Only
Aluminum Steel Aluminum Steel
Single Single Dual Dual
3W 3/8" BSP Valve & Cyl Port. 1/4" BSP Pilot Port B24255 B24254 B24261 B24260
6T 3/8" SAE Valve & Cyl Port. 1/4” SAE Pilot Port B24257 B24256 B24264 B24263
Dual Valve
3/8" Ports
Basic Code 1CEE24 (Internally Cross Piloted)
Note: For applications above
210 bar - please consult our
technical department or use
the steel body option.
38.10
(1.50)
19.00
(0.75)
12.00
(0.47)
63.50
(2.50)
40.00
(1.57)
23.50
(0.93)
63.50
(2.50)
42.00
(1.65)
32.00
(1.26)
11.00
(0.43)
2 holes
Ø6.50
(0.26) thro
CT1
1
2
3
BATCH CODE
31.75
(1.25)
14.00
(0.55)
23.50
(0.93)
63.50
(2.50)
15.90
(0.63)
88.90 (3.50)
72.00
(2.83)
57.00
(2.24)
9.00
(0.35)
28.00
(1.10)
61.00 (2.40)
2 holes Ø6.50
(0.26) thro
18.00
(0.71)
23.50
(0.93)
CT1 CT2
C1
C2
V1
V2
––
C1
V1
C2
V2
