Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 K-470.A
An Eaton Brand
K
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
1CEOMP35/1CEEOMP35 - Motor Mounted Valves
OMP Mounting Pattern Single and Dual Overcenter Valves
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.
Pilot Ratios
2.5:1 Best suited for
extremely unstable
applications such as
long booms or flexible
frameworks.
5:1 Best suited for
applications where load
varies (Standard)
and machine structure
can induce instability
10:1 Best suited for
applications where the
load remains relatively
constant.
1CEOMP35-1 1CEOMP35-2 1CEEOMP35
The pressure required to open
the valve and start actuator
movement can be calculated
as follows:
Pilot Pressure =
(Relief Setting) - (Load Pressure)
Pilot Ratio
Ratings and Specifications
Figures based on: Oil Temp = 40°C Viscosity = 32 cSt (150 SUS)
Rated flow 30 L/min (8 USgpm)
Max setting Max load induced
Pressure: 270 bar (4000 psi)
Relief setting: 350 bar (5000 psi)
Cartridge material Working parts hardened & ground steel
External surface zinc plated
Body material Standard aluminium (up to 210 bar*)
Add suffix '377' for steel option
Mounting position Unrestricted
Cavity Number A6610 (See section M)
Torque cartridge into cavity 45 Nm (33 ibs ft)
Weight 1CEOMP35 1.6 kg (3.52 lbs)
(inc cartridges) 1CEEOMP35 1.66 kg (3.65 lbs)
Seal kit number 1CEOMP35 SK1285 (Nitrile) SK1285V (Viton)
1CEEOMP35 SK1284 (Nitrile) SK1284V (Viton)
Recommended filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating Temp -30°C to +90°C (-22° to 194°F)
Leakage 0.3 milliL/min nominal (5 dpm)
Nominal viscosity range 5 to 500 cSt
Performance Data
M1
V1
M2
V2
CT1
M1
V1
M2
V2
CT2
M1
V1
M2
V2
CT1
CT2