8-107
Catalogue HY11-3500/UK
8
SVLB_UK.INDD RH 12.05.10
Hydraulically Pilot Operated Check Valve
Series SVLB
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Characteristics
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. The pilot control
ratio is 6:1.
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 ef-
fective 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 SVLB valve series provides leak-
free separation of port A and B in the closed position.
Features
• Pilotoperatedcheckvalve
• Cavityandmountingpatternacc.toISO7368
• Dampeningpoppetoptional
• 5sizesNG16toNG50
Plate only
for NG50
X
Y
1
3
4
2
A
B
8-108
SVLB_UK.INDD RH 12.05.10
Catalogue HY11-3500/UK
8
Hydraulically Pilot Operated Check Valve
Series SVLB
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Ordering Code / Characteristics
Seal Design
style
acc. to
ISO 7368
Pilot
control
ratio
6:1
Hydr.
operated
check
valve
Closing
spring
Slip-in
mounting
Code Seal
omit NBR
V FPM
Code Spring
N 0.5 bar
S 1.6 bar
T 2.5 bar
U 4.0 bar
6B
Ordering code
Valve
size
Code Size
16 NG16
25 NG25
32 NG32
40 NG40
50 NG50
SVL
B 10
Poppet
type
Design
series
(not required
for ordering)
Code Poppet type
4 04
8
1)
08
1)
with damping nose
Technical data
General
Nominal size
NG16 NG25 NG32 NG40 NG50
Interface Slip-in mounting acc. ISO 7368
Mounting position unrestricted
Ambient temperature [°C] -20...+80
MTTF
D value [years] 75
Weight [kg] 2.3 3.2 4.6 7.8 12.0
Hydraulics
Max. operating pressure [bar] 350
Nominal flow [l/min] 250 450 900 1300 1800
Fluid Hydraulic oil acc. to DIN 51524...525
Viscosity recommended
permitted
[cSt]/[mm²/s]
[cSt]/[mm²/s]
30...50
20...380
Fluid temperature [C°] -20...+70
Filtration ISO 4406 (1999); 18/16/13
∆p/Q flow curve
Poppet type 04, 08, without spring
E16 E25 E32 E40 E50
open (M5) open (M5) open (M5) open (M5) open (M6)
Ø1.2 (M5) Ø1.2 (M6) Ø1.2 (M6) Ø1.2 (M6) Ø1.2 (M8)
open (M5) open (M6) open (M6) open (M6) open (M8)
Ø1.0 (M5) Ø1.2 (M5) Ø1.3 (M5) Ø1.5 (M5) Ø2.0 (M6)
Standard orifices
Slip-in
cartridge
valve
E
All characteristic curves measured with HLP46 at 50°C.
8-109
Catalogue HY11-3500/UK
8
SVLB_UK.INDD RH 12.05.10
Hydraulically Pilot Operated Check Valve
Series SVLB
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
* width 65 mm
Size 16 25 32 40 50
H 84 88 93 103 138
b1 79* 85 102 125 140
d1
H7
32 45 60 75 90
d2
H7
25 34 45 55 68
t2
+0.1
56 72 85 105 122
Bges. 99 94 103 125 140
Dimensions
NG Kit
DIN912 12.9
[Nm] NBR FPM
16 BK441 4x M8x50 33 SK-SVLB10-E16 SK-SVLB10-E16V
25 BK391 4x M12x50 115 SK-SVLB10-E25 SK-SVLB10-E25V
32 BK415 4x M16x55 281 SK-SVLB10-E32 SK-SVLB10-E32V
40 BK416 4x M20x70 553 SK-SVLB10-E40 SK-SVLB10-E40V
50 BK417 4x M20x75 553 SK-SVLB10-E50 SK-SVLB10-E50V
8-110
SVLB_UK.INDD RH 12.05.10
Catalogue HY11-3500/UK
8
Parker Hannifin GmbH
Hydraulic Controls Division
Kaarst, Germany
Notes