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As Chas has suggested, you should control the pump speed using a DP sensor...similar to a variable pumping and VAV AC system, while maintaining the 2-way control valves to attain operational cost savings..however, it may not be much as you stated that the entering temperature does not vary much...

Mint..the static efficiency curve of a prop fan is bell shaped, peaking at approx. 2/3 of max. flow. Webber...for a forward curve centrifugal fan, the BHP curve rises continuously as the CFM increases...IOW, its an overloading type fan. So when you increase the static pressure, the CFM reduces...

You may also want to limit the pressure drop on the common pipe. Based on your proposed config., i would believe that the pressure drop will include all piping (and fittings) from the last tee (right-most sec. pump based on the ref. drawing) to the point of coupling at the return pipe. For...

Apart from the need to know the limit on motor speed to ensure cooling of the motor windings, one also need to ensure that at lower speeds the fan operating point will not be in the surge region. With the fan curves, the operating point at 100% volume, and the static pressure at 0% volume...