EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 E-260.A
An Eaton Brand
E
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
1LR300 - Relief Valve
Poppet, direct acting, differential area
380 L/min (100 USgpm) • 350 bar (5000 psi)
Description
This is a fast, direct acting
differential area screw-in car-
tridge relief valve. Ideal for
intermittent duty as protec-
tion against overload or surge
conditions for all types of
actuators. Very fast acting and
extremely dirt tolerant.
Operation
Pressure acts over the differen-
tial area between the seat and
seal on the poppet. When the
pressure exceeds the setting,
the valve opens, allowing relief
flow to tank, washing contami-
nant away from the seat.
Features
Dirt tolerant, robust and con-
sistent with good pressure
rise to increase in flow char-
acteristics for a direct acting
valve. Cartridge construction
provides for maximum flexibil-
ity in mounting.
Pressure Drop Curves
Performance Data
Sectional View
Ratings and Specifications
Figures based on: Oil Temp = 40°C Viscosity = 32 cSt (150 SUS)
Rated flow 380 L/min (100 USgpm)
Max setting 350 bar (5000 psi)
Cartridge material Working parts hardened and ground steel.
External surfaces zinc plated.
Body material Standard aluminium (up to 210 bar*).
Add suffix "377" for steel option.
Mounting position Unrestricted
Cavity A1126 (See Section M)
Torque cartridge into cavity 150 Nm (110 lbs ft)
Weight 1LR300 1.04 kg (2.3 lbs))
1LR350 2.08 kg (4.6 lbs)
Seal kit SK207 (Nitrile)
SK207V (Viton
®
)
Recommended filtration level BS5540/4 Class 18/13 (25 micron nominal)
Operating temp -30°C to +90°C (-22°C to 194°F
Leakage 1 millilitre/min nominal (15 dpm)
Nominal viscosity range 5 to 500 cSt
Viton is a registered trademark of E.I. DuPont
2
1
Flow - US gpm
Flow - L/min
Pressure - psi
Pressure - bar
400
350
300
250
200
150
100
50
0
5800
5075
4350
3625
2900
2175
1450
725
0
0 50 100 150 200 250 300 350 400
0 25 50 75 100
Pressure (2)
Tank (1)
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 E-261.A
An Eaton Brand
E
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
1LR300 - Relief Valve
Poppet, direct acting, differential area
380 L/min (100 USgpm) • 350 bar (5000 psi)
3 Port Sizes
Code Port Size Housing Number
Aluminium Steel
10W 1 1/4" BSP B5134 A882
20T 1 1/4" SAE B7783 B11553
1 Function
1LR300 - Cartridge Only
1LR350 - Cartridge and Body
2 Adjustment Means
F - Screw Adjustment
Model Code
1LR*** F 10W 35
1 2 3 4 5
4 Pressure Range
Note: Code based on pressure
in bar.
20 - 35-210 bar.
Std setting 100 bar
35 - 70-350 bar.
Std setting 280 bar
Std setting made at 30 L/min
5 Seals
S - Nitrile (For use with most
industrial hydraulic oils)
SV - Viton
®
(For high
temperature and most
special uid applications)
104
(4.09)
approx
70.0
(2.76)
Tank (1)
56.4 A/F
1-5/8-12 UN-2A
Pressure (2)
208
(8.19)
max
2 holes Ø9.0 (0.35) thro’
65.00 (2.56)
32.0 (1.26)
63.50
(2.5)
32.0
(1.26)
104.0
(4.09)
37.7
(1.48)
80.00
(3.15)
8.00
(0.31)
76.2
(3.00)
22
1
1
Dimensions
mm (inch)
Note: Tightening torque of “F"
adjuster locknut - 20 to 25 Nm.
Note: For applications above
210 bar please consult our
technical department or use
the steel body option.
Installation Drawing
1 1/4" Ports
Basic Code
1LR350
Cartridge Only
Basic Code
1LR300
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