Control systems Safety valves
4
Capacity Table - Water - 10% Overpressure -m 3 /h
Hole Designation / Current Area (cm²)
Opening pressure (bar g)
A2 0.316
B2 0.457
C1 1.119
E1 2.408
F1 3.637
G1 6.586
1.0
0.6
1.2
1.9
3.5
5.3
7.1
1.5
0.8
1.5
2.3
4.2
6.3
8.4
2.0
0.9
1.7
2.6
4.8
7.1
9.6
2.5
1.0
1.9
2.9
5.3
8.0
10.7
3.0
1.1
2.0
3.2
5.8
8.7
11.8
3.5 4.0 4.5
1.2
2.2
3.5
6.3
9.4
12.7
1.2
2.4
3.7
6.7
10.1
13.6
1.3
2.5
4.0
7.2
10.7
14.4
5.0
1.4
2.6
4.2
7.5
11.3
15.2
5.5 6.0 6.5
1.4
2.8
4.4
7.9
11.8
15.9
1.5
2.9
4.6
8.3
12.3
16.6
1.6
3.0
4.7
8.6
12.8
17.3
7.0
1.6
3.1
4.9
8.9
13.3
18.0
4.7 79
7.5
1.7
3.2
5.1
9.2
13.8
18.6
8.0
1.7
3.3
5.3
9.5
14.3
19.2
8.5
1.8
3.4
5.4
9.8
14.7
19.8
9.0
1.9
3.5
5.6
10.1
15.1
20.4
9.5
1.9
3.6
5.7
10.4
15.5
20.9
10 12 14 16 18
2.0
3.7
5.9
10.7
15.9
21.5
2.1
4.1
6.5
11.7
17.5
23.5
2.3
4.4
7.0
12.6
18.9
25.4
2.5
4.7
7.4
13.5
20.2
27.1
2.6
5.0
7.9
14.3
21.4
28.8
20.7
2.8
5.4
8.5
15.3
22.9
30.9
For sizing using the current areas, the discharge coefficient K for liquid is 0.540. GPM= m 3 /h x 4.403
Pressure Minimum opening pressure
Purchasing Information The following information is required for the correct sizing and selection of SV568L Relief Valves: 1) Fluid 2) Required Capacity (Flow) 3) Operating Pressure and Opening Pressure 4) Viscosity and Density
0.5 bar g
Maximum opening pressure
20.7 bar g at 217 ºC
SxS offers the PSV Calc calculation and sizing software for selecting safety and relief valves.
TI-P276-04 CTLS Issue 1
Page 3 of 3
SV568L Relief Valve
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