EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-390.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Pressure DropDescription
The 1SEL overcenter valve
performs all duties of a regular
overcenter but maintains
a counterbalance pressure
to provide dampening of
cylinders when there is a
rapid loss in stored pressure.
This counterbalance pressure
reduces as the pilot pressure
increases. Typical applications
include extension cylinders on
telescopic handlers where it
is important to have a smooth
operation when retracting
from full extension.
Ratings and Specifications
Figures based on: Oil Temp = 40˚C Viscosity = 32 cSt (150 SUS)
Rated flow 30 L/min (8 USgpm)
Max setting 380 bar (5510 psi)
Cartridge material Working parts hardened and ground steel.
External steel surfaces zinc plated.
Mounting position Unrestricted
Cavity number A20090-T11A
Torque cartridge into cavity 45 Nm (33 lbs ft)
Weight 0.15 kg (0.33 lbs)
Seal kit number SK1079 (Nitrile) SK1079V (Viton
®
)
Recommended filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating temperature -30° 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
Performance Data
Sectional View
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
Primary 4.3:1
Secondary 0.4:1
1SEL30 - Overcenter Valve
Counterbalanced, pilot assisted relief with check
30 L/min (8 USgpm) • 380 bar (5510 psi)
Operation
The check section allows free
flow and then locks the load
against movement. The pilot
assisted relief valve section
will give controlled movement
when pilot pressure is applied,
maintaining a counterbalance
pressure to prevent initial
pressure loss and therefore
instability. The total pressure
setting will normally be set
at 1.3 times the load induced
pressure. The counterbalance
pressure reduces as the pilot
pressure increases.
Note: This valve has been
designed to eliminate
instability from flexible boom
applications or where the
load induced pressure varies
greatly. To get the best results,
the settings should be adjust-
ed for each application and
then factory set for porduction
quantities. Please contact our
Technical Department for more
information.
Pilot (3)
Valve (2)
Cyl (1)
1
2
3
Flow - US gpm
Flow - L/min
Pressure - psi
750
600
450
300
150
0
0 10 20 30 40 50
0 2.5 5 7.5 10 12.5
Pilot open
Free flow
Pressure - bar
50
40
30
20
10
0
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-391.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Model Code
1SEL30 F 30 S 230 50
1 2 3 4 5 6
1 Function
1SEL30
2 Adjustment Means
Counterbalance
Setting
F - Screw Adjustment
N - Fixed - State pressure
setting required
For xed versions add setting in 10
bar increments to end of part number.
Subject to a ±10% tolerance.
3 Pressure Range @ 4.8 L/min
Note: Code based on pressure in bar.
20 - 170-300 bar Std setting 220 bar (170/50)
30 - 240-370 bar Std setting 280 bar (230/50)
40 - 270-380 bar Std setting 350 bar (300/50)
Std setting at 4.8 L/min
4 Seals
S - Nitrile (For use with most industrial hydraulic oils)
SV - Viton (For high temperature and most special uid
applications)
5 High Pressure
Setting Bar
(10 bar increments)
130 to 310 bar (2175 to 5000 psi)
6 Counterbalance
Setting Bar
(10 bar increments)
20 to 120 bar (300 to 1740 psi)
1SEL30 - Overcenter Valve
Counterbalanced, pilot assisted relief with check
30 L/min (8 USgpm) • 380 bar (5510 psi)
Dimensions
mm (inch)
Cavity
Model A20090-T11A
Form Drill TD-11A
Form Reamer TR-11A
Cartridge Only
Basic Code
1SEL30
0.05
A
-A-
Ø31.75 (1.25)
Ø25.40 (1.00)
21.87 (0.861)
21.82 (0.859)
Ø
20.68 (0.814)
20.63 (0.812)
Ø
Min optional drill Ø
for socket clearance
1.6
(0.06)
1.6
(0.06)
1.6
(0.06)
1
3
2
M20 x 1.5-6H
30º
45º
0.00
0.00
0.00
21.11 (0.831)
21.21 (0.835)
Ø
45º
Location
shoulder
3.96
(0.16)
12.70
(0.50)
min full
thread
27.38
(1.08)
18.31
(0.72)
35.18
(1.385)
35.05
(1.379)
41.28
(1.62)
23.83
(0.94)
Ref
Thread and
all diameters
R0.50
0.25 (0.01) x 45º max
R0.50
Ø13.49 (0.53)
18.64 (0.733)
18.54 (0.729)
Ø
17.50 (0.688)
17.45 (0.687)
Ø
Ø17.48
(0.69)
Ø10.72
(0.42)
18.26
(0.72)
5.56
(0.22)
17.48
(0.69)
min
depth
– – /
Note: Tightening torque of "F"
adjuster locknut - 20 to 25 Nm
81.3
(3.20)
72.0
(2.83)
19.0
(0.75)
34.8
(1.37)
L.S.
1
2
3
Ø25.1 (0.99)
max
Screw in to
increase pressure
Screw out to
release load
17.00 A/F
22.22 A/F
M20 x 1.5 thread
