Control systems Pressure reducing/surplussing valves
4
Compressed air capacities chart
4.6 137
Upstream pressure bar
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
DN80
How to use the chart Capacities are given in cubic decimetres of free air per second (dm 3 /s). The use of the capacity chart can be best explained by an example. Required, a valve to pass 100 dm 3 /s of free air reducing from 12 bar to 8 bar. Find the point at which the curved 12 bar upstream pressure line crosses the horizontal 8 bar downstream pressure line. A perpendicular dropped from this point shows that whereas a DN15LC valve will only pass 57 dm 3 /s and is therefore not large enough, a DN15 valve will pass approximately 120 dm 3 /s under these conditions and is the correct valve size to choose.
TI-P004-01 CTLS Issue 8
Page 9 of 12
SDP143 Pilot Operated Pressure Surplussing Valve with Cast Steel Body
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