Contamination detection

A DCV wafer check valve installed in the main line

produces a small pressure drop, ensuring that a proportion

of the flow passes through the sampling chamber.

Flash vessel

The DCV wafer check valve installed at the flash steam outlet from

the flash vessel, ensures that steam from the make-up valve does

not flow back into the flash vessel. The DCV wafer check valve after

the FT steam trap ensures that condensate does not flood back up

into the flash vessel.

Pipeline ancillaries

Disc, split disc and wafer check valves

DCV Wafer Check Valve Applications Sheet 3

AI-P134-33 ST Issue 2

Blowdown vessel

When a blowdown vessel receives blowdown from more than one

boiler, a DCV wafer check valve should be installed on each

separate blowdown line. This will prevent the blowdown from one

boiler flowing back into another boiler. In many countries this is a

statutory requirement.

7.6.28