Control systems Pressure reducing/surplussing valves
4
Compressed air capacities chart
4.6 177
Upstream pressure bar
DN15LC
DN15
DN20
DN25
DN32
DN40
DN50
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. Safety information, installation and maintenance For full details see the Installation and Maintenance Instructions (IM-P100-05 for the DP27G and DP27GY, or IM-P470-03 for the DP27E, DP27R and DP27Y) supplied with the product. Installation note: The pilot operated pressure reducing valve should be installed in a horizontal pipeline, protected by a strainer and a separator, with the direction of flow as indicated by the arrow on the valve body. How to order example: 1 off Spirax Sarco DN32 DP27 pilot operated pressure reducing valve having a 0.2 - 17 bar spring and flanged EN 1092 PN25 connections.
TI-P470-01 CTLS Issue 13
Page 13 of 16
DP27, DP27E, DP27G, DP27GY, DP27R & DP27Y Pilot Operated Pressure Reducing Valves with SG Iron Bodies
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