Control systems Pressure reducing/surplussing valves
4
Steam and compressed air capacity chart
10
9
9
8
8
7
7
6
6
5
5
4
4
3
3
Upstream pressure bar g (x 100 = kPa)
2
4.6 25
2
1
0
0 0 0 0 0 0 0 0
100
200
300
400
500
1" - DN25 1¼" - DN32 1½" - DN40 2" - DN50 1" - DN25 1¼" - DN32 1½" - DN40 2" - DN50
Steam capacity kg/h
100
200
300
400
500
600
200
400
600
800
1 000
400
200
600
800
1 000
1 200
1 400
20
40
60
80 100 120 140 160 160
180
Compressed air capacity dm 3 /s * free air
20 40 60 80 100 120 140
180 200
40 320 40 80 120 160 200 240 280 320 360 400 440 80 120 160 200 240 280
* dm 3 /s = I/s, 1 I/s 2 c.f.m.
How to use the chart The curved lines labelled 2, 3, 4, 5 etc., represent upstream pressures. Downstream pressures are read along the vertical line on the left hand side of the chart. How to use the chart is best described by an example:- Required, a pressure reducing valve to pass 350 kg/h reducing from 8 to 6 bar. From the downstream pressure of 6 bar on the left hand side of the chart extend out horizontally until the line meets the curved 8 bar upstream line. At this point read vertically downwards where it will be seen that DN25 BRV71 or BRV73 will be required.
TI-P210-01 CTLS Issue 6
Page 5 of 7
BRV71 and BRV73 SG Iron Pressure Reducing Valves
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