6-31
Hydraulically Pilot Operated Check Valves
Series SVLE (Parker), C4V (Denison)
Catalogue HY11-3500/UK
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
6
SVLE-C4V_UK.INDD RH
Characteristics
Pilot operated check valves are available with both Parker
(series SVL) and Denison (series C4V) ordering codes.
Hydraulically pilot operated check valves allow free flow
from A to B. The counter-flow direction is blocked.
When pressure is applied to control port X, the ring
chamber flow from B to A is released.
Up to four different pilot control ratios are available (see
ordering code).
Function
When no pressure is applied to the X-port, the flow from
B to A is blocked, because the pressure in B is also in
effect on top of the poppet.
Pressurizing the X port relieves the area on top of the
poppet to the drain port and allows flow from B to A.
The seat design of the SVL valve series provides leak-free
separation of port A and B in the closed position.
Technical data
General
Nominal size
NG10 NG25 NG32
Subplate mounting ISO 5781
Mounting position Unrestricted
Ambient temperature [°C] -20...+80
Weight [kg] 2.8 4.6 6.1
Hydraulic
Max. operating pressure [bar] 350
Nominal flow [l/min] 150 270 450
Fluid Hydraulic oil to DIN 51524
Viscosity recommended [cSt]/[mm²/s] 30...50
permitted [cSt]/[mm²/s] 20...380
Fluid temperature recommended [mm²/s] 30...50
permitted [mm²/s] -20...+70
Filtration ISO 4406 (1999); 18/16/13
∆p/Q flow curve
must be connected to tank
6-32
SVLE-C4V_UK.INDD RH
Hydraulically Pilot Operated Check Valves
Series SVLE (Parker), C4V (Denison)
Catalogue HY11-3500/UK
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
6
E
SVL
5
LR
Seal Hydr. pilot
operated
Check
valve
Nominal
size
Poppet
type 04
Closing
spring
Design
style to
ISO 5781
Design
Series
(not required
for ordering)
Pilot
control
ratio
Subplate
mounting
External
drain port
Y1 (G1/4")
Ordering Code
4
Code Seal
omit NBR
V FPM
Code Ratio
1 1 : 1
3 3 : 1
8 8 : 1
9 10 : 1
Code Pressure [bar]
N 0.5
R 1.0
T 2.0
U 4.0
Code Size
P15 NG10
P20 NG25
P32 NG32
Parker
Denison
Seal
Check
valve
pilot
operated
Code Seal
1 NBR
5 FPM
C4V
Code Approx. cracking pressure [bar]
Flow A to B Flow B to A
C4V03 C4V06/10 C4V03 C4V06/10
2 1.0 1.0 1.5 1.7
4 4.0 3.5 5.5 6.0
6 2.0 2.2 3.0 3.8
Options
Approx.
cracking
pressure
Code Nominal size
03 NG10
06 NG25
10 NG32
B
Design
series
Nominal
size
5
Max.
pressure
350 bar
9
Y1-port
G¼"
Opening
ratio
Code Opening ratio
1 1 : 1
3 3 : 1
8 8 : 1
9 9 : 1
The Denison model code is avail-
able for existing applications.
Otherwise also refer to Parker
model code.
The Parker model code should
be used for all new applications.
Otherwise also refer to Denison
model code.
6-33
Hydraulically Pilot Operated Check Valves
Series SVLE (Parker), C4V (Denison)
Catalogue HY11-3500/UK
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
6
SVLE-C4V_UK.INDD RH
Dimensions
Tolerance for all dimensions ±0.2
NG ISO-code x1 x2 x3 x4 x5 x6 x7 y1 y2 y3 y4 y5 y6
10 5781-06-07-0-00 42.9 35.8 - - 7.2 21.5 31.8 66.7 58.8 33.4 - - -
25 5781-08-10-0-00 60.3 49.2 - - 11.1 20.6 44.5 79.4 73 39.7 - - -
32 5781-10-13-0-00 84.2 67.5 - 42.1 16.7 24.6 62.7 96.8 92.8 48.4 - - -
NG ISO-code B1 B2 H1 H2 H3 H4 H5 H6 L1 L2 L3 L4 L5 L6
10 5781-06-07-0-00 87.3 33.4 83 21 62.5 - - - 29.4 95.2 43.7 111 5 -
25 5781-08-10-0-00 105 39.7 109.5 29 89 - - - 35.1 127.2 43.7 111 5 -
32 5781-10-13-0-00 120 48.4 120 29 99.5 - - - 31 144.7 43.7 111 5 -
NG ISO-code d1max d2max d3 t3 d4 t4 d5 d6
10 5781-06-07-0-00 15 7 7.1 8 M10 16 10.8 17
25 5781-08-10-0-00 23.4 7.1 7.1 8 M10 18 10.8 17
32 5781-10-13-0-00 32 7.1 7.1 8 M10 20 10.8 17
NG ISO-code NBR FPM Surface finish
10 5781-06-07-0-00 BK-M10 x 35-4pcs 68 Nm SK-SVLE5P10 SK-SVLE5P10V
25 5781-08-10-0-00 BK-M10 x 45-4pcs 68 Nm SK-SVLE5P25 SK-SVLE5P25V
32 5781-10-13-0-00 BK-M10 x 45-6pcs 68 Nm SK-SVLE5P32 SK-SVLE5P32V
6-34
SVLE-C4V_UK.INDD RH
Catalogue HY11-3500/UK
Parker Hannifin GmbH & Co. KG
Hydraulic Controls Division
Kaarst, Germany
6
Notes
