Boiler house Bottom blowdown systems
2
Minimum air pressure/Differential pressure Differential pressure (ΔP) across the valve
Minimum air pressure bar g
DN15 - DN25
DN32 - DN50
10 bar g 15 bar g 20 bar g 25 bar g 30 bar g 32 bar g 42 bar g 63 bar g 68 bar g 80 bar g 100 bar g
0.7
1.8
0.9
2.6
1.1
3.3
1.2
4.0
1.4
4.7
1.4
5.0
1.7
2.4
2.11 4
2.6
2.9
3.6
Capacities
Size DN15 DN20 DN25 DN32 DN40 DN50 Kv 4.9 7.2 10 18 Capacity (m 3 /h)
180
160
0
0.0 0.0 0.0
0.0
140
DN32 - DN50
0.5
3.5 5.1 7.1
12.7
120
1
4.9 7.2 10.0
18.0
10
15.5 22.8 31.6
56.9
100
20 30
21.9 32.2 44.7
80.5
80
DN25
26.8 39.4 54.8
98.6
Pressure (bar)
40
31.0 45.5 63.2
113.8
60
DN20
50
34.6 50.9 70.7
127.3
40
60
38.0 55.8 77.5
139.4
DN15
70
41.0 60.2 83.7
150.6
20
80
43.8 64.4 89.4
161.0
0
90
46.5 68.3 94.9
170.8
0
10
20
30
40
50
Pressure (bar)
100
49.0 72.0 100.0
180.0
TI-P405-51 EMM Issue 6
Page 4 of 11
BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN50
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