Cert. No. LRQ 0963008

ISO 9001

7.6.27 Multiple pump installations

A DCV wafer check valve fitted with a suitable soft seat is installed

after each pump. This will ensure that reverse flow does not occur

back through the pumps that have stopped running.

Pipeline ancillaries

Disc, split disc and wafer check valves

DCV

Wafer Check Valve

Applications Sheet 3

AI-P134-33

ST Issue 2

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification.

© Copyright 2004

Boiler feedline

A DCV wafer check valve, fitted with an EPDM soft seat and a heavy

duty spring, is installed after the boiler feedpump. This ensures that

reverse flow back through the pump will not happen when the pump

shuts down. The heavy duty spring ensures that gravity flow into the

boiler does not occur when both the pump and the boiler are

shutdown, therefore protecting the boiler against flooding.

Storage tanks

A DCV wafer check valve fitted in reverse will act as a vacuum

breaker, safeguarding the vessel from possible collapse if a vacuum

forms inside.