Direct steam injection

Inert gas blanket

Vacuum breaker

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.

Relief valve

a

̀

7.6.24

One DCV wafer check valve fitted with a heavy duty

spring, acts as a low pressure relief valve, maintaining

a constant pressure within the vessel. The second

DCV wafer check valve acts as a vacuum breaker.

Pump foot valve

Pipeline ancillaries

Disc, split disc and wafer check valves

Inert gas blanket

A DCV wafer check valve fitted with a soft seat, installed

at the suction inlet of the pump, will ensure that the

pump's prime is not lost when it stops running.

a

̀

DCV Wafer Check Valve Application Sheet 1

AI-P134-25 ST Issue 4