How to choose the model of non-negative pressure water supply equipment, and what kind of non-negative pressure water supply equipment has higher cost performance? What points should I pay attention to?
1, the selection of non-negative pressure water supply equipment must first know the basic working conditions, such as tap water pressure, flow rate and lift; Select the corresponding water pump according to the flow and lift, and then select the model of frequency converter according to the power of the water pump, and the power of the frequency converter is the same as that of a single water pump; According to the current of the water pump, choose air switch, AC contactor, thermal relay, relay and other electrical components. The selected current A of electrical components is larger than that of water pump, which is generally about 1. 1- 1.5 times; The size of the steady flow compensation tank is selected according to the flow rate, and the diameter of the compensation tank is 400, 600, 800 and 1000.
2. There is no absolute cost performance. As long as you don't buy three products, you can choose different brands according to your needs. First-line brands include Wei Paige, Li Sanhe and Panda. Second-line brands include Hunan Shende Pump System Company, Shanghai Kaiquan and Shanghai Dongfang Pump Industry.
3, pay attention to the efficiency of the pump, the inverter is best imported from ABB and Danfoss, and the domestic inverter is still not so stable; There is also whether there is a surge tank and whether there is a pressure protection device at the entrance.