Reverse ratchet
Reverse ratchet
(OP)
Hello all,
I am doing these bid evaluations and was wondering how does a reverse ratchet work and its configuration. It is for a motor that drives a vertical turbine pump for river intake system
Thanks
abuzent
I am doing these bid evaluations and was wondering how does a reverse ratchet work and its configuration. It is for a motor that drives a vertical turbine pump for river intake system
Thanks
abuzent





RE: Reverse ratchet
Thanks
RE: Reverse ratchet
Basically, in vertical pumps when pump stops the water will flow backwards. This will result in the pump/motor rotating backwards. If the pump were to trip and go into this condition and then an operator tried to start it up, damage to the pump/motor could occur. Not knowing your piping configuration (i.e. if there are check valves on the pump discharge), I'm not sure if it would be a necessity or not. I don't know what horsepower you're dealing with, but I can't imagine the option is that much of a cost adder for the insurance it offers. At the least you might contact the vendors that didn't offer it and ask them to give you the option. I personally would recommend purchasing the option.
RE: Reverse ratchet
If you don't have a check valve to protect the pump, that is another matter.
It may be a standard feature that is furnished with the pump motor anyway, so they bring it out as a feature.
I don't usually see them used, but that is just me.
rmw
RE: Reverse ratchet
Barry1961
RE: Reverse ratchet
Hilliard has a nice clutch series called Magna Torque that is very compact and has torque from 82 lb-ft to 43,600 lb-ft.
You can order your electric motor with a shaft out the other end then mount the clutch with a factory torque arm on it to stop the reverse rotation.
Hope this helps, David
RE: Reverse ratchet
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: Reverse ratchet
Still concidering the it was bored, keyed, and had drilled and tapped bolt holes, it was a good value and I was able to fit it in to my design parameters very well.