... between the shaft power, pressure, speed and flow: Flow and speed time proportional to the square; ... * N2 PW = K3 * N3 N-speed Q-flow pump outlet pressure P-PW-shaft power K1, K2, and ... . So the control requirements such as multi-pump operation, fault switching, constant voltage constant water ... rated current 1 second Occasions: indoor, free from direct sunlight, no corrosive gas, flammable gas, oil ...