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Why is the stainless steel centrifugal water pump very quiet?

Most of the time when a electric pump started, it makes a buzzing sound,the normal cast iron water pump 's sound is about 40db.
If the water pump works ,it is affect our rest and sleep.so pump station usually build far away from resident house.some pump station even were designed and built under ground.
The sound of water pump runing has two prats,one is because the motor drive the pump,then there is sound made by electric motor.the other is come from the pump tunnerl,the impeller drives the water, the flow and impeller has friction,the sound comes out.
Gelaili GDL series water pump and HL series water pump are made of stainless steel,they are very quite,they run only 12db,only slightly larger than the leaves blown by the wind.
Why stainless steel water pump is so quiet?
Due to rough surfaces of cast iron water pump,greater friction with the flow was caused.But the stainless steel impeller and tunnel is very smooth,the friction is very small,so the stainless steel water pump is so quiet that you can not notice it is exist.
Besides,these pumps are all use NSK bearing,so when you operate the water pump,it is very low sound.
Gelaili stainless steel water pump,protect your sleep time,keep you away from noisy,leave you only peace and quiet every night.
Gelaili pump industry supply good pumps with 50 years manufacture experience.
We provide aquarium water pump,shower pump, coolant pump,dirty water pump,dewatering pumps,booster pump,ro booster pump and so on.

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