<P> A check valve , clack valve , non-return valve , reflux valve , retention valve or one - way valve is a valve that normally allows fluid ( liquid or gas ) to flow through it in only one direction . </P>
<P> A check valve , clack valve , non-return valve , reflux valve , retention valve or one - way valve is a valve that normally allows fluid ( liquid or gas ) to flow through it in only one direction . </P>
what is the function of non return valve
what is the function of non return valve
normally allows fluid ( liquid or gas ) to flow through it in only one direction
normally allows fluid ( liquid or gas ) to flow through it in only one direction