Ross Mackay Forum Moderator 94 Posts
Re: How best to install a Non-Return Valve25 April 2011 at 1:29pm
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.
I am HoD mechanical at Uch Power Station-Pakistan. We have three cooling water pumps to circulate cooled water from cooling tower's cold water basin into steam turbine condenser and vice and versa. Each CW pump is a mixed flow centrifugal pump with 17280 m3M/Hr capacity; 495 RPM; 971 shaft power. Two pumps remain in service while one at stand-by. We have anti-reverse devices installed at each pump for reverse-flow protection. At pump discharge, we have a motor operated butterfly valve. Problem: We are experiencing too many failures of our anti-reverse devices. So we intend to install "Non-Return Valve" between pump discharge and discharge motor operated valve. It may be pertinent to highlight that our discharge line is of 72-inch diameter. Will it be practicable to install non-return valve at this bigger line? If so, could you share some detail about the type NRV suitable for our application and any other technical information?
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