HA 5218
12/2014
M27 x 1.5 • p
max
350 bar • Q 90 L/min
Pilot Operated Check Valves
SC5H-R3/l
q
Load-holding without leakage
q
Low pressure drop
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 5218 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. The valve
remains shut off closely if the pressure in channel (1) is
equal to or higher than the pressure in channel (2) and
no pressure and / or insufficient pressure only is exerted
in the channel (3). As soon as the pressure in the channel
(2) exceeds the pressure in the channel (1) including
pressure caused by the spring the valve opens the flow
from (2) to (1). If the liquid has to flow through the valve
from (1) to (2) the control pressure should be introduced
in the channel (3). As soon as this pressure attains
a necessary value the control gate valve is shifted
against the spring and moves the valve cone out
of the seat. At calculating the control pressure
it is necessary to take into consideration that pressure in
the channel (2) will increase the control pressure
by the same value multiplied by an effective differential
area. This effective differential area has a value of 1 – 1/4
at a rate of control areas of 4:1.
As for appropriate basic surface finish the external parts
are zinc coated.
Functional Description
2
HA 5218
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
SC5H-R3/l
Pilot Operated Check Valve
Technical Data
Cavity M27 x 1.5
Maximum flow L/min 90
Pilot ratio 4:1
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 0.27
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
Standard 4:1
4
Seals
No designation NBR
Optional pilot seal
No designation without seal
S wit seal
3
HA 5218
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
54.00 MIN REAM
1.6
0.08
B
0.08
0.05
23.05
23.00
1.6
1.6
42.00
M27 x 1.5-6g
6HR32
3
2
1
HEX 32.0
M27 x 1.5-6g
Cavity Measurements in millimeters
Dimensions Measurements in millimeters
4
HA 5218
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.
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
2x OTVO
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
2x OTVOR
2x HOLES Æ 11.0 THRO¢
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
