HA 5219
12/2014
M27 x 1.5 • p
max
350 bar • Q
max
90 L/min
Pilot Operated Check Valves
with Decompression
SCD5H-R3/l
q
Load-holding without leakage
q
Low pressure drop
q
Decompression stage
q
Optional pilot seal
q
The valve should be mounted as close as possible
to the actuator
q
Fits the same cavity as the R3 overcentre valve
1
2
3
Replaces
HA 5219 7/2008
The design of the valve fitted with conical seat ensures
hermetical closing in one direction and in the other
direction of flow with a small pressure drop. In this case
the question is an indirectly controlled one-way valve
opened hydraulically. The closing element (valve cone
of the main stage of the valve) and a ball (of the control
stage) are pressed to the seat of the valve by the spring
force. If the channel (2) pressure exceeds the spring
pressure and pressure in the channel (1) the liquid flows
through the valve opened. The appropriate pressure
drops are identified on the characteristics as a free rate
of flow. In the case of this direction of flow the valve
operates as a simple one-way valve.
In the opposite direction the liquid can flow from
the -channel (1) to the channel (2) in the case a sufficient
control pressure acts in the channel (3) only.
Opening pressure =
of the control stage
(decompression)
By opening a small amount the control valve
the pressure in the channel (2) is dropped in such extent
that he control pressure in the channel (3) is sufficient
for opening the main stage.
Opening pressure
of the main stage =
Pressure drop values at the main stage opened are
identified in the flow characteristics as open by
the control.
During computing the control pressure it is necessary to
take into consideration that pressure acting in
the channel (2) increases the control pressure by
the same value multiplied by the effective differential
area having a value of 1 – 1/25 in case of a value of
the ratio of control surfaces of 25:1.
As for appropriate basic surface finish the external parts
are zinc coated.
Pressure of channel (1)
3
Pressure of channel (1)
25
Functional Description
2
HA 5219
20
15
10
5
25
0 5 10 15 20 25
0 20 40 60 80 100
80
FREE FLOW
PILOT OPEN
160
240
320
0
Pressure p barD []
Flow Q L/min[]
Flow Q US GPM[]
Pressure p PSID []
Ordering Code
SCD5H-R3/l
Pilot Operated Check Valve
with decompression
Technical Data
Cavity M27 x 1.5
Maximum flow L/min 90
Pilot ratio decomperssion 25:1
Pilot ratio full flow 3:1
Max. pressure bar 350
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, Class 21/18/15
Weight kg 0.24
Maximum valve tightening torque
in valve body or in control block
Nm 60
+2
Mounting position Unrestricted
Dp-Q Characteristics Measured at n = 40 mm
2
/s
Pilot ratio
Decompression 25:1
Full flow 3:1
3
Seals
No designation NBR
Optional pilot seal
No designation without seal
S wit seal
3
HA 5219
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
2
1
6HR32
M27x1,5-6g
51,0
18,5
11,5
MIN
MAX
7,0
MIN
Æ11,0
HEX 32.0
M27 x 1.5-6g
Cavity Measurements in millimeters
Dimensions Measurements in millimeters
4
HA 5219
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
Seal kits on request.
The use of aluminium bodies is limited to a maximum operating pressure of 210 bar.
2x HOLES Æ 11.0 THRO¢
2x OTVOR
11
2x HOLES Æ 11.0 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
Valve Bodies Measurements in millimeters
Dual body without valve
Material Ports Port size Type code
Aluminium
C1, C2, V1, V2 G1/2 SB-R3-0205AL
C1, C2, V1, V2 SAE 10, 7/8-14 SB-R3-0206AL
Steel
C1, C2, V1, V2 G1/2 SB-R3-0205ST
C1, C2, V1, V2 SAE 10, 7/8-14 SB-R3-0206ST
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
