Pipeline ancillaries Disc, split disc and wafer check valves
10
Pressure loss diagram Pressure loss diagram with the valve open at 20 ° C. The values indicated are applicable to spring loaded valves with horizontal flow. With vertical flow, insignificant deviations occur only within the range of partial opening. The curves given in the chart are valid for water at 20 ° C. To determine the pressure drop for other fluids the equivalent water volume flowrate must be calculated and used in the graph.
Where:
V w = Equivalent water volume flow in l/s or m ³ /h = Density of fluid kg/m ³ V = Volume of fluid l/s or m ³ /h V w = 1000 x V
Pressure loss information for steam, compressed air and gases is available from Spirax Sarco.
Pressure loss (bar)
K v values DN
50
80
100
150
200
250
300
K v
48
118
325
747
1 361
2 274
3 349
For conversion: C v (UK) = K v x 0.963 C v (US) = K v x 1.156
Opening pressures in mbar Differential pressures with zero flow. Ô Flow direction Flow DN50
7.5.44
DN80
DN100
DN150
DN200
DN250
DN300
13.8
13.8
13.8
13.8
13.8
13.8
13.8
Ô
36.0
36.0
36.0
40.0
47.0
48.0
51.0
How to order Example: 1 off Spirax Sarco SDCV3 having a carbon steel body (LCC) for installation between DN150, PN40 flanges. Complete with EN 10204 3.1 certification for the body.
10.5 61
Safety information, installation and maintenance For full details see the Installation and Maintenance Instructions (IM-S19-03-EN-ISS1) supplied with the product. Note: The SDCV split disc check valve range is not suitable for heavy pulsating flows (compressors) or vertical down flows. Flanges, bolts (or studs), nuts and joint gaskets are to be provided by the installer.
TI-P601-43 CMGT Issue 4
Page 5 of 6
SDCV3, SDCV4, SDCV7 and SDCV8 Split Disc Check Valves
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