Select an automatic water supply equipment is the fundamental basis for the design of water flow and water pressure (water head), and the need to consider changes in the type of traffic to use. Continuous: a day with little normal leakage flow is zero when the network itself or on maintaining a certain flow, for example, large hotels, restaurants, industrial and mining enterprises pressurized systems. Intermittent: water trough for a long time and the flow is very small or zero, for example: a small office building, office, commercial and residential, various types of residential, and industrial water, etc. should also take into account changes in the water flow of a certain period of time and changes in various factors in different seasons flows, different in different regions, such as water. Fire sprinkler water supply equipment and water supply equipment in general should choose pneumatic water supply equipment, its deputy dwell long in the system state, no flow changes, water supply equipment, pneumatic tube leak can cope with the general, and a small increase in traffic pump, usually do not need to start the main pump, saving energy. Life water supply equipment selection conversion water supply equipment or pneumatic supply equipment available, both have their advantages. Frequency of water supply equipment advantages: constant pressure water supply and constant value can be within a certain range of the adjustable constant voltage accuracy is generally less than 0.02MPa, frequency control is an efficient energy saving methods and the usual pressure water supply equipment, the average energy saving compared to 20%, in addition, the frequency and the start of the impact of a small current pump 盍 impact is small, little noise at low speed. Advantages pneumatic water supply equipment: cost is relatively low, the control system technology is simple, convenient service, maintenance easy. Flow range: ≤360m3 / h Pressure range: ≤2.5MPa temperature range: -20 ℃ ~ 110 ℃ Motor power: ≤315kW pressure regulation accuracy: ≤0.01Mpa 1, various types of water plant, water stations. 2, industrial and civil life, production, fire water system. 3, the public facilities in hotels, restaurants domestic hot water, air conditioning water systems. 4, pipelines, pump stations constant delivery systems and factories, mines ventilator oil pressure regulation system. 5, hot water boilers and hot water pipes constant pressure constant pressure system.