Dear Mr. DevilDoc:
I'm curious, the page on the
shurflo pump indicates its a high quality diaphragm pump, but does not identify the type of motor (my guess is DC series?).
Second, in using the voltage controller, to control the pump via Pulse Width Modulation, delivery pressure is proportional to pump speed, right?
Therefore at low speeds, pump and spray pressure is also low, at high speeds the nozzle size dictates the maximum operating pressure, right?
So I might get less atomizing pressure at low speed and full atomization at high speed. Not really ideal.
What if I make the pump deliver to a accumulator (common rail!) and tap the rail with lets say, 3 lines each going to a separate solenoid-valve, nozzle combination.
The pump will be controlled by a simple
pressure switch with cut-in at say 150 psi and cut-out at 200 psi. All it would do is keep the rail supplied at the right pressure. I would install a
check valve to prevent backflow to the pump.
The solenoids and the nozzles would be triggered by the
Progressive Controller, not the motor.
I could use a very small nozzle (maybe 0.5 gph) for good low speed atomization, mated with the 1st solenoid, operating from idle up to 1200-1500 rpm, then a slightly larger one (1 gph) operating from 1500 rpm up to say 2500 rpm, and then the largest one (2 gph) from 2500 rpm up.
Turn on times (duration) are determined by the
Progressive Controller! Operating pressure remains constant (and high), delivery is tailored to demand, and I get NO leaks during high manifold vacuum situations.
I could use a thermostatic switch to prevent delivery if the engine is cold.
Whaddaya think?
Best Regards,
Dusky Lim