SD2H-LA3
M24 x 1.5 • Q
max
40 l/min (11 GPM) • p
max
320 bar (4600 PSI)
B
T
A
A B
T
35 40
0
510
15
20 25
10
20
50
30
40
30
1
(1.3) (2.6) (4.0) (5.3) (6.6) (7.9) (9.3) (10.6)
(725)
(580)
(435)
(290)
(145)
Subject to change · SD2H-LA3_4080_2en_06/2019
www.argo-hytos.com
Page 1
3/3 Hydraulically operated hot oil shuttle valve for hydrostatic drives, screw-in cartridge design
Technical Features
Functional Description
Technical Data
Characteristics measured at ν = 32 mm
2
/s (156 SUS)
Flow Q [l/min (GPM)]
› Hardened precision parts
› High flow capacity
› Simple design and reliable function
› Optional pressure ranges
› Automatic alternating fluid discharge from the low-pressure line of hydrostatic circuit
› Standard version of the valve is zinc-coated with the surface corrosion protection 240 h in NSS acc. to ISO 9227
Pressure drop ∆p [bar (PSI)]
Valve size / Cartridge cavity M24 x 1.5 / LA3
Max flow l/min (GPM) 40 (10.6)
Max. operating pressure bar (PSI) 320 (4640)
Cracking pressure bar (PSI) 7 (102) 12 (174)
Fluid temperature range (NBR) °C (°F) -30...+100 (-22 ...+212)
Fluid temperature range (FPM) °C (°F) -20 ...+120 (-4 ...+248)
Weight kg (Ibs) 0.23 (0.50)
Datasheet Type
General information GI_0060 Products and operating conditions
Valve bodies
In-line mounted SB_0018 SB-LA3* (On request)
Sandwich mounted SB-04(06)_0028 SB-*LA3* (On request)
Cavity details SMT_0019 SMT-LA3*
Spare parts SP_8010
Connection
1 B → T, A → T
Pressure drop related to flow rate
Symbol
3-way screw-in cartridge valve is designed for the specific function discharging of heated working fluid from
the closed hydrostatic circuit through a cooler and a filter to the tank. The spool is operated hydraulically
and provides automatically fluid discharging always from the low-pressure line.
Closed hydrostatic drives are generally loaded with high transmitted power. Losses, generating due the
transformation of mechanical energy into pressure energy and vice versa, turn into heat.
It leads to the thermal load of equipment and to the necessity to connect a cooler to the circuit.
Cover cup - Standard Cover cup - P
97 (3.82)
31 (1.22)
s=27
97 (3.82)
20 (0.79)
21 (0.83)
M24x1,5
78 (3.07)
12,5 (0.49) 12,5 (0.49)
31 (1.22)
24
100 Nm
(73.8 lbf.ft)
SD2H - LA3 / H -
070
120
A
B
Subject to change · SD2H-LA3_4080_2en_06/2019
www.argo-hytos.com
Page 2
Dimensions in millimeters (inches)
Ordering Code
Application example
This hot oil shuttle valve is typically used in hydrostatic transmissions. It discharges approxi-
mately 10% of the closed-loop hydrostatic flow through a cooler and a filter back to the
tank. The valve senses the pressure in both branches and the spool is automatically operated
to drain the heated fluid from the low-pressure line, it means from the line leading the fluid
from the actuator back to the pump inlet. Reversing the pump rotation the pressure in
branches is changed and the spool of valve is switched-over. The discharged flow is adjusted
with downstream pressure relief valve which is typically set at 15 to 30 bar (at 200 to 400
PSI). The cooled and filtered fluid is refilled to the low-pressure line by means of a gear pump
via check valves.
3/3 Hydraulically operated hot oil
shuttle valve for hydrostatic drives,
screw-in cartridge design
Surface treatment
zinc-coated (ZnCr-3), ISO 9227 (240 h)
zinc-coated (ZnNi), ISO 9227 (520 h)
No designation
V
Seals
NBR
FPM (Viton)
Cover cup
standard - across flats 27 mm
HEX 24
Model
High performance
Cracking pressure
7.0 bar (102 PSI)
12.0 bar (174 PSI)
No designation
P
Valve cavity
M24 x 1.5
