Which type of flexible coupling is good to use in front of and behind the water pump?
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I was confused about which type of flexible coupling to use before and after the water pump; I consulted relevant information – there are those made of stainless steel and those made of rubber – but which one is more suitable? What are the advantages of each option? Which one has the larger drag coefficient? The operating conditions are as follows: clean water, head of 50 m, and the pipes are carbon steel with diameters ranging from DN100 to DN500. Also, is it possible to customize the flanges on both sides with different pressure specifications? Please recommend some high-quality domestic manufacturers. Thank you!
Personally, I think stainless steel would be better; after all, carbon steel tends to rust in clean water, which results in a looser connection. As far as I know, standard hose fittings only go up to DN150; there seems to be no standard equivalent for larger sizes. Also, I don’t understand what you meant by your second question. If you’re asking whether flanges with different pressure ratings can be connected together, my answer is no.
The flanges of flexible joints should all be made of stainless steel; the only difference lies in the use of stainless steel bellows and rubber hoses between the flanges. Additionally, the two different flanges are connected together because, in the event of water hammer, the force acts primarily on the check valve; therefore, a higher pressure rating for the check valve is chosen, which allows for the elimination of one straight pipe section.
At our site, aside from the large circulation water pump (300 m3/h), none of the other pumps use flexible connectors, yet they all operate just as well
The water pumps we used this time all have a flow rate of over 300 m3/h, with the highest reaching 1800 m3/h
Our circulating water pumps use rubber, while other pumps do not have flexible connections.