Eaton VICKERS SystemStak Manual page 17

Performance Characteristics
Pressure Drop Data
Typical performance with mineral oil at
21 cSt (102 SUS) and at 50_C(122_F) u
Pressure drop: flow path A1 to A or B1 to B (no pilot-pressure
operation)
psi bar
30
400
27
24
300 21
18
15
200
12
9
100
6
3
0
0 10 20
0 4
u For other viscosities see "Further Information".
Pilot Pressures
Pilot area ratios:
Main check valve . . . . . . . . . . . . . . . .
Decompression poppet . . . . . . . . . .
Use applicable ratio and opening/
cracking pressure to calculate pilot
pressure to open valve element, applied
to the following formulae:
To open valve or decompression poppet
in line A:
) p
p
A C
Pressure at B1 =
Area ratio factor
To open valve or decompression poppet
in line B:
) p
p
B C
Pressure at A1 =
Area ratio factor
Where:
p = Pressure at A
A
p = Cracking/opening pressure
C
p = Pressure at A1
A1
p = Pressure at B
B
p = Pressure at B1
B1
A =
Service line location;
B =
see functional symbols
A1=
B1=
Leakage
Less than 0,25 ml/min (0.015 in
250 bar (3625 psi).
30 40 50 60 L/min
8 12 16 USgpm
Flow rate
3:1
10:1
– p
A1
+ p
A1
– p
B1
+ p
B1
3
/min) at
Pressure drop: flow path A to A1, or B to B1 with check valve
pilot-operated fully open
psi bar
25
300
20
15
200
10
100
5
0
0
0
17
10 20 30 40 50
4 8 12
Flow rate
60 L/min
16 USgpm