Pipeline ancillaries Disc, split disc and wafer check valves
10
Heat exchangers
DCV wafer check valves are used to prevent reverse flow in the secondary flow line, and in the condensate line after the float trap to ensure that the exchanger does not flood. A DCV wafer check valve fitted after the control valve will also act as a vacuum breaker.
Hot water heating systems
In dual pump installations where one pump is running and the others is on stand-by, DCV wafer check valves prevent short circuiting through the stand-by pump. Heavy duty springs will help prevent gravity circulation when pumps are shutdown. EPDM soft faced discs should be fitted.
7.5.34
10.5 51
AI-P134-32 ST Issue 3
Page 3 of 3
DCV Wafer Check Valve Applications Sheet 2
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