EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 F-190.A
An Eaton Brand
F
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
Flow - L/min
Pressure - psi
Pressure - bar
Flow - US gpm
0 25 50 75 100
0 6.5 13 19.5 26
240
210
180
150
120
90
60
30
0
16
14
12
10
8
6
4
2
0
Free ow
Piloted open
1CEB90 - Overcenter Valve
Fully balanced, pilot assisted relief with check
90 L/min (23 USgpm) • 270 bar (4000 psi)
Description
Overcenter valves give static
and dynamic control of loads
by supplying a counterbalance
pressure to the actuator. They
prevent runaway in the event
of hose burst and hold the
load with minimal leakage.
The pressure balanced valve is
unaffected by back pressure,
allowing service line reliefs
to operate and for the valve
to be used in regenerative or
proportional valve systems.
The overcenter valve should
be mounted either into, onto
or as close to the actuator as
possible to give maximum
protection.
Single overcenter valves
control unidirectional loads
such as in aerial platforms,
cranes or winches and dual
overcenters are suited to
bi-directional motion such as
wheel motor applications or
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
4:1 Best suited for applications
where load varies and machine
structure can induce instability.
Other ratios available upon
request.
Ratings and Specifications
Performance data is typical with fluid at 32 cST (150 SUS)
Rated flow 90 L/min (23 USgpm)
Max relief pressure 350 bar (5000 psi)
Max load induced pressure 270 bar (4000 psi)
Cartridge material Working parts steel.
External surfaces zinc plated.
Standard housing materials Aluminum up to 210 bar. Add suffix “377” for steel option.
Mounting position Unrestricted
Cavity A12336 (see Section M)
Torque cartridge into cavity 60 Nm (44 lbs ft)
Weight 1CEB90: .29 kg (.63 lbs)
1CEB95: 1.35 kg (2.97 lbs)
1CEEB95: 2.10 kg (4.62 lbs)
Seal kit SK634 (Nitrile)
SK634V (Viton
®
)
Filtration BS5540/4 Class 18/13 (25 micron nominal)
Temperature range -30° to +90°C (-22° to +194°F)
Internal leakage 0.3 ml/min (5 dpm)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E.I. DuPont
Performance Data
Sectional View
Pressure Drop
Pilot (3)
Valve (2)
Cyl (1)
Vent
3
1
2