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)
Pressure drop: flow path A to A1, or B to B1 with check valve
pilot-operated fully open
0
bar
50
60
40
30
20
10
L/min
0
4
8
12
16
USgpm
0
psi
Flow rate
200
Pressure drop
100
10
0
bar
50
60
40
30
20
10
L/min
0
4
8
12
16 USgpm
0
psi
Flow rate
3
6
9
12
15
18
21
24
27
30
100
200
300
400
Pressure drop
5
15
20
25
300
u
For other viscosities see
“
Further Information
”
.
Pilot Pressures
Pilot area ratios:
Main check valve
3:1
. . . . . . . . . . . . . . . .
Decompression poppet
10:1
. . . . . . . . . .
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:
Pressure at B1 =
To open valve or decompression poppet
in line B:
Pressure at A1 =
Where:
p
A
=
Pressure at A
p
C
=
Cracking/opening pressure
p
A1
=
Pressure at A1
p
B
=
Pressure at B
p
B1
=
Pressure at B1
A =
B =
A1=
B1=
Leakage
Less than 0,25 ml/min (0.015 in
3
/min) at
250 bar (3625 psi).
p
A
)
p
C
–
p
A1
Area ratio factor
+ p
A1
p
B
)
p
C
–
p
B1
Area ratio factor
+ p
B1
Service line location;
see functional symbols
17
