What are you pumping and why do you need to vary the speed?
Since you pump is a "boost pump" it is designed to increase the water pressure of an existing distribution system. As such, it is designed to work for a short time even with the output blocked! So add a valve to limit the output rather than trying to change the motor speed. Total blockage should also trigger a switch to turn the pump off until the output is no longer blocked.
I am trying to pump water from a small tank and flow it through a small pipe network. and then i want to control the amount of flow to show that the water can be supplied at a higher rate during peak hours of use.
What's the maxixum flow rate that you need?
I don't want to specify a 100 gallons/hr pump if you only need 10
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Normal.
the pump I am using right now has 3170 GPH. anything around these values would be great.
I will be using the pump for not more than 1.5-2 hrs.
Maybe you should look for a 2 stage centrifugal 220V (or 110V) AC pump. And add a controllable ball valve or butterfly valve at the exit.
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