1
HA 5209
7/2008
M27 x 1,5 • p
max
380 bar • Q
max
90 L/min
Overcentre Valve
2 Stage
SOD5A-R3/l
q
The valve prevents runaway in the event of a nega
-
tive load
q
Load-holding with minimal leakage
q
Pressure relief function protecting the actuator
against overload and pressure peaks
q
When installed into the actuator the valve can be
used as a hose burst valve
q
Stabile performance by maintaining a counterbal
-
ance pressure
q
The valve should be mounted as close as possible
to the actuator
q
Fits the same cavity as the R3 check valve
1
23
Replaces
HA 5209 9/2006
Functional Description
The valve consists of a seat by-pass, relief valve fitted
with an auxiliary control with a differential piston and
by-pass single-way valve serving for reverse direction
of flow. The liquid is flowing through the single-way valve
from the channel (2) to the channel (1) with a small
pressure drop. In the opposite direction the single-way
valve on the rear side of which a gate valve seat is fitted is
pressed through the action of a spring and the load
pressure against the spring-loaded valve gate valve.
In this way the valve is nearly closed hermetically. If
the pressure in the channel (1) exceeds a set up value
of the spring force the gate valve is pressed out of
the seat and the overpressure in that case is relieved into
channel (2). For ensuring the function of holding the load
the spring force should be set up to a value by 30 %
higher when compared to an expected pressure exerted
by the load.
If the load has to be moved it is possible to ensure it with
the help of so called auxiliary control from the channel (3)
by introducing already certain control pressure.
The control pressure is calculated in the following way:
Control pressure =
The ratio of control designates a ratio of surfaces
of the differential slide valve cross-section area and its
seat. Therefore, the necessary control pressure for
opening the valve does not correspond to the difference
between the set up pressure and load pressure however;
it corresponds to the ratio of this difference and
the control ratio. In the formula as mentioned above it is
necessary to take into consideration that in differential
cylinders it is necessary to add to the control ratio also
the appropriate ratio of piston surfaces in the direction
of movement.
As soon as the control pressure attains a necessary
value the differential gate valve is moved out from
the seat and then the way from the channel (1) to
the channel (2) is released. If now the load tries to
accelerate and be fast as for the oil supply the supply
pressure decreases, therefore, also the control pressure
in the channel (3) is decreased. The spring force tries to
shut off the valve again, therefore, in consequence
of which the flow from the consumer decreases and
the inlet pressure to the consumer increases again.
In this way it is ensured a constant inlet pressure by
means of which the movement of the load can be
controlled.
Starting braking valves of SOD5A series cover the whole
range of the use of single-stage starting braking valves.
In addition to it, this valve exerts a counter pressure to
prevent from a sharp pressure drop at opening the valve.
In this way the valve makes a particularly sensitive
movement of consumers possible.
As for appropriate basic surface finish the external parts
are zinc coated.
set up pressure – load pressure
ratio of control
2
HA 5209
Ordering Code
Technical Data
Cavity M27 x 1,5
Pilot ratios
Primary 5,6:1
Secondary 0,7:1
Maximum flow L/min 90
Max. pressure bar 380
Pressure drops bar see Dp - Q characteristics
Hydraulic fluid Hydraulic oil (HM, HV) according to DIN 51524
Fluid temperature range °C -20 ... +90
Viscosity mm
2
/s 20 ...400
Maximum degree of fluid contamination according to ISO 4406 (1999), Class 21/18/15
Weight kg 0,29
Maximum valve tightening torque
in valve body or in control block
Nm 60
+2
Dp-Q Characteristics Measured at n = 40 mm
2
/s
16
14
12
10
8
6
4
2
0 20 40 60 80 100
FREE FLOW
PILOT OPEN
240
210
180
150
120
90
60
30
0 5 10 15 20 25
Pressure p barD []
Flow Q L/min[]
Flow Q US GPM[]
Pressure p PSID []
0
0
SOD5A-R3/l
Overcentre valve
2 Stage
Preassare range
210 - 380 bar
30
Factory setting 280 (220/60)bar for Q=4.8L/min
Seals
No designation NBR
15°
30°
45°
30°
51.00
36.00
M27x1.5-H
40.00
29.30
29.20
16.00
24.55
24.50
22.00
56.00
20.50
10.00 MAX
18.00
3.30
3.05
4.00
MAX
R 0.20
0.10
0.05
-A-
A
A
B
B
0.3
1.6
1.6
0.08
B
0.08
0.05
23.05
23.00
1.6
1.6
42.00
54.00 MIN REAM
3
HA 5209
6HR5
6HR17
62.0 MAX
3
2
1
54.0
6HR32
M27x1.5-6g
Dimensions Measurements in millimeters
Cavity Measurements in millimeters
HEX 5.0
HEX 17.0
HEX 32.0
M27 x 1.5-6g
2x OTVOR
4
HA 5209
2x OTVOR
Caution!
The packing foil is recyclable.
The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should
not be construed in any case as a guaranteed representation of the product properties in the sense of the law.
ISO A
The use of aluminium bodies is limited to a maximum operating pressure of 210 bar.
Valve Bodies Measurements in millimeters
Seal kits on request.
2 HOLES Æ11.0 THRO'
2 HOLES Æ11.0 THRO'
Body without valve
Material Ports Port size Type code
Aluminium
1, 2 G1/2
SB-R3-0105AL
3 G1/4
1, 2 SAE 10, 7/8-14
SB-R3-0106AL
3 SAE 6, 9/16-18
Steel
1, 2 G1/2
SB-R3-0105ST
3 G1/4
1, 2 SAE 10, 7/8-14
SB-R3-0106ST
3 SAE 6, 9/16-18
Dual body without valve
Material Ports Port size Type code
Aluminium
C1, C2, V1, V2 G1/2 SB-R4-0205AL
C1, C2, V1, V2 SAE 10, 7/8-14 SB-R4-0206AL
Steel
C1, C2, V1, V2 G1/2 SB-R4-0205ST
C1, C2, V1, V2 SAE 10, 7/8-14 SB-R4-0206ST
Spare Parts
Subject to alteration without notice!
ARGO-HYTOS s.r.o. CZ - 543 15 Vrchlabí
Tel.: +420-499-403111, Fax: +420-499-403421
E-mail: sales.cz@argo-hytos.com
www.argo-hytos.com
