Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
6
6-21
C4V pilot oper. UK.INDD CM 18.07.11
Hydraulically Pilot Operated Check Valve
Series C4V
Characteristics
Hydraulically pilot operated check valves C4V 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.
must be connected to tank
Features
• Valves with position control are available on request
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
6
6-22
C4V pilot oper. UK.INDD CM 18.07.11
Hydraulically Pilot Operated Check Valve
Series C4V
Ordering Code / Technical Data
SealCheck 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 10 : 1
Technical data
Ordering code
General
Nominal size NG10 NG25 NG32
Subplate mounting ISO 5781
Mounting position Unrestricted
Ambient temperature [°C] -20...+80
MTTF
D
value [years] 150
Weight [kg] 2.8 4.6 6.1
Hydraulic
Max. operating pressure [bar] 350
Nominal flow [l/min] 150 270 450
Fluid Hydraulic oil according to DIN 51524
Viscosity recommended [cSt] / [mm²/s] 30...50
permitted [cSt] / [mm²/s] 20...380
Fluid temperature recommended [°C] 30...50
permitted [°C] -20...+70
Filtration ISO 4406 (1999); 18/16/13 (meet NAS 1638:7)
∆p/Q flow curve
Characteristic curve measured with HLP46 at 50°C.
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
6
6-23
C4V pilot oper. UK.INDD CM 18.07.11
Hydraulically Pilot Operated Check Valve
Series C4V
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 5781-08-0-0-00 105 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 Bolt kit
Surface finish
NBR FPM
10 5781-06-07-0-00 BK 505 4x M10 x 35 DIN 912 12.9 63 Nm ±15% S16-39362-0 S16-39362-5
25 5781-08-10-0-00 BK 485 4x M10 x 45 DIN 912 12.9 63 Nm ±15% S16-39364-0 S16-39364-5
32 5781-10-13-0-00 BK 506 6x M10 x 45 DIN 912 12.9 63 Nm ±15% S16-39366-0 S16-39366-5
Parker Hannifin Corporation
Hydraulics Group
Catalogue HY11-3500/UK
6
6-24
C4V pilot oper. UK.INDD CM 18.07.11
Notes
