1
HA 5216
7/2008
M38 x 2 • p
max
380 bar • Q
max
140 L/min
Overcentre Valve
2 Stage
SOD5A-T3/l
q
The valve prevents runaway in the event of a nega
-
tive load
q
Load-holding without 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
1
2
3
Replaces
HA 5216 9/2006
set up pressure – load pressure
ratio of control
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 correspon ds 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.
Functional Description
2
HA 5216
0 40 80 120 160 200
0 10 20 30 40 50
FREE FLOW
PILOT OPEN
0
725
580
435
290
145
50
40
30
20
10
Pressure p barD []
Flow Q L/min[]
Flow Q US GPM[]
Pressure p PSID []
Ordering Code
SOD5A-T3/l
Overcentre valve
2 Stage
Technical Data
Cavity M38 x 2
Pilot ratios
Primary 6,1:1
Secondary 0,5:1
Maximum flow L/min 140
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 1.2
Maximum valve tightening torque
in valve body or in control block
Nm 150
+2
Mounting position any
Dp-Q Characteristics Measured at n = 40 mm
2
/s
Pressure range
230 - 380 bar
30
Factory setting 280 (220/60)bar for Q=4.8L/min
Seals
No designation NBR
3
HA 5216
Cavity Measurements in millimeters
A
Æ
0.05
Æ
0.08
Æ
1
2
3
45°
73.00
68.00
55.00
25.00
19.50
MIN REAM
3.50
3.30
15°
MAX
Æ
5.00
22.00
MAX
Æ17.50
45.50
69.00
0.30
0.05
1.6
1.6
1.6
A
A
1.6
0.20
R 0.10
Æ 36.00
60°
40.70
40.60
M38 x 2.0-6H
Æ 51.00
1.6
1.6
30°
Æ31.00
32.05
32.00
34.05
34.00
45°
-A-
Æ
Æ
Æ
30°
M38x2.0
6HR46
s=38
6HR17
6HR5
3
2
1
HEX 5
HEX 17
s =38
HEX 46
M38 x 2
Dimensions Measurements in millimeters
4
HA 5216
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
Valve Bodies Measurements in millimeters
Seal kits on request.
Body without valve
Material Ports Port size Type code
Aluminium
1, 2 G1"
SB-T3-0109AL
3 G1/4
1, 2 SAE 16, 1-5/16-12
SB-T3-0110AL
3 SAE 6, 9/16-18
Steel
1, 2 G1"
SB-T3-0109ST
3 G1/4
1, 2 SAE 16, 1-5/16-12
SB-T3-0110ST
3 SAE 6, 9/16-18
2x OTVOR
2x OTVOR
2x HOLES Æ 11.0 THRO¢
2x HOLES Æ 11.0 THRO¢
Dual body without valve
Material Ports Port size Type code
Aluminium
C1, C2, V1, V2 G1" SB-T4-0209AL
C1, C2, V1, V2 SAE 16, 1-5/16-12 SB-T4-0210AL
Steel
C1, C2, V1, V2 G1" SB-T4-0209ST
C1, C2, V1, V2 SAE 16, 1-5/16-12 SB-T4-0210ST
Spare Parts
The use of aluminium bodies is limited to a maximum operating pressure of 210 bar.
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
