EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-370.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
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
Pressure Drop
Description
The 1SER series overcenter
valve performs all duties of
a regular overcenter but is
able to relieve and stay open
irrespective of downstream
pressure. This enables the
valve to operate when
used with a closed center
directional valve which has
service line reliefs. The
poppet is pressure balanced,
preventing relief setting
increase due to back pressure.
Ratings and Specifications
Figures based on: Oil Temp = 40˚C Viscosity = 32 cSt (150 SUS)
Rated flow 30 L/min (8 USgpm)
Max relief setting 350 bar (5000 psi)
Max load induced pressure 270 bar (4000 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
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
4:1 Best suited for applications
where load varies and machine
structure can induce instability.
1SER30 - Overcenter Valve
Part balanced, pilot assisted relief with check
30 L/min (8 USgpm) • 270 bar (4000 psi)
Pilot (3)
Valve (2)
Cyl (1)
3
1
2
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-371.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Model Code
1SER30 F 35 S 4
1 2 3 4 5
1 Function
1SER30
3 Pressure Range
@ 4.8 L/min
Note: Code based on pressure
in bar.
35 - 75-350 bar
Std setting 210 bar
Std setting made 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)
Dimensions
mm (inch)
5 Pilot Ratio
4 - 4:1
Cartridge Only
Basic Code
1SER30
Cavity
Model A20090-T11A
Form Drill TD-11A
Form Reamer TR-11A
1SER30 - Overcenter Valve
Part balanced, pilot assisted relief with check
30 L/min (8 USgpm) • 270 bar (4000 psi)
2 Adjustment Means
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.
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.
68.9
(2.71)
66.4
(2.61)
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
