Cooling

water in

Steam in

Cooling water out

Heat exchangers

Condensate out

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.

7.6.26

Pipeline ancillaries

Disc, split disc and wafer check valves

Process vessels

On process applications that require both heating and cooling of

the vessel a DCV wafer check valve will protect each of the supply

lines against reverse flow. Valves on water duty should be fitted

with EPDM soft faced discs.

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.

DCV Wafer Check Valve Applications Sheet 2

AI-P134-32 ST Issue 3