Expert ForumsPumps

Topic: Re: How best to install a Non-Return Valve

posed by 
The NR valve should be located on the discharge line after the pipe has been increased in size from the pump discharge nozzle, so a larger diameter would be ideal as long as it's larger than the pump discharge flange size.
I'm afraid I can't guide you on the type or manufacture of valve to use as there are many good quality valve manufacturers in the world.