Centrifugal pump principle, in similar circumstances, pump flow, lift and power, respectively, with its speed of the first party, the second power and the third power is proportional to. For the water often changes in the occasion, the use of frequency control pump water supply, can significantly reduce the throttle loss, with significant energy savings. Pumps and fans Frequency Control is recognized as a very effective energy-saving measures. China's government agencies (the State Science and Technology Commission, the State Economic and Trade Commission) in the "China's energy-saving technology policy outline" in the pump and fan frequency control technology as a national nine five plan to promote energy-saving technology projects. According to the purpose of building water supply into life (production) water supply and fire water two categories. In the life of the water supply system with variable frequency pump speed control, with energy saving, adjustable water supply and other prominent advantages, at home and abroad have been more and more widely used. In the fire water supply system, usually fire pipe network by the booster, regulator pump regulator, so keep in the high pressure (fire water pressure) to prepare the fire status. In the event of a fire, activating the main fire pump immediately provides fire-fighting water at prescribed pressures and flows. According to China's fire code, the duration of water fire, the longest press 3 hours to consider, so the main fire pump energy-saving issues can not be considered, so there is no need to use frequency control to save energy. As we all know, the inverter is an electronic device, when using the inverter control of the main fire pump frequency control, because the fire is a hundred years, a thousand years of events, under normal circumstances will not happen. In this way, long-term fire pump inverter instead, in the event of a fire, but prone to failure, reducing the reliability of fire protection. In addition, the inverter control system more complex electrical, will reduce the reliability and increase cost. Fire pump power is generally larger, the price of its control inverter also increased accordingly. In summary, the fire pump, energy saving, reliability and cost considerations, no need to adopt frequency control technology. If the fire pump with variable frequency speed control, take the lead in another issue is the automatic standby fire pump input control issues. According to China's fire code, the fire pump should be equipped with a spare pump, spare pump should not be less than any one of the main fire pump. The theory of multi-pump constant pressure water supply in parallel, multi-pump constant pressure water supply, speed control pump must be one of the largest pump, the other parallel pump automatically into or out of the inverter controller by the water flow control automatically. Failure of the inverter pump may cause the inverter to trip, causing all fire pumps to stop pumping. From this point of consideration, the use of frequency control fire pump will reduce the reliability of fire water supply, fire water system should not be used. As we all know, fire-fighting pipe network system in a particular situation, in a non-fire state also rely on the regulator pump to maintain the preparation of high-pressure fire state. The use of variable frequency pressure regulator constant pressure has outstanding advantages: constant pressure pump constant voltage regulator, pressure adjustable; regulator pump frequency control operation, energy saving, low noise, long service life; pump power, Low power inverter price is low; the use of a variable frequency pump automatic pump control inverter; when the variable frequency pressure regulator is good, the pump will automatically stop the pressure regulator to maintain the pressure tank, the energy saving effect is better, And to extend the life of pump. According to our production and delivery of user shows that frequency conversion regulator, inverter fire is one of the best automatic water fire water supply program, has been more and more widely used.