Pipeline ancillaries Disc, split disc and wafer check valves
10
Blending
In blending applications DCV wafer check valves will prevent reverse flow back along the supply lines. A common blending application is steam/cold water mixing to produce hot water.
Direct steam injection
7.5.33
In a direct steam injection application, when the contents of the tank has reached the set temperature, the temperature control valve will close. Any steam downstream of the temperature control valve will rapidly condense and reduce in volume. This rapid reduction in volume will create a vacuum and liquid from the tank could be drawn back up into the steam line. A DCV wafer check valve fitted after the temperature control valve and in reverse, will prevent this from happening. It will open when a vacuum is present and allow air into the line.
10.5 46
AI-P134-25 ST Issue 4
Page 2 of 3
DCV Wafer Check Valve Applications Sheet 1
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