Sales of small Europe: 159-7414-3465 Online QQ: 1922601218 nationwide toll-free hotline: 400-086-8955 Address: Yuhua District, Italy all the way to the modern business center B4062 Star Factory Address: Changsha City Lituo Industrial Park (welcome all customers to visit the factory equipment) without negative pressure water equipment principle: The basic operating principle is the frequency of water supply equipment to run the pump automatically adjust the number of units and a water pump speed changes according to the user, so that the pump outlet pressure remains constant. When a user less than a water pump out the water, the system according to changes in water has a variable speed pump is running, when the water increases the pressure drop in the pipe system, when the pressure sensor to detect the signal transmitted to the computer control unit , run by computer to determine, issue commands to the inverter to control the pump motor, the speed is accelerated to ensure that the system pressure constant, whereas when the water was reduced, so that the pump speed slows down to maintain constant pressure. When the water is greater than a water pump, the first pump is switched to frequency operation, the second pump start frequency control operation, when the water is less than two pumps out water, can automatically stop one or two pumps run. Throughout the operation, and always maintain the same constant pressure system, the pump is always working in the university area, both to ensure constant water supply users, but also saves energy. Equipped with full equipment without operator. No negative pressure water equipment features: significant economic benefits: using the device, without the construction of towers, no roof water tanks, reducing the construction cycle works, but also solve the high cost of the shortcomings of the project cost, but also to overcome the pressure fluctuations, pump starts and frequent deficiencies. Rigorous design: The device uses constant pressure pump control, no matter how the water changes in the system are to make the pipe outlet pressure remains constant and reliable operation: The device uses variable speed drives and high-quality domestic water pump, with perfect protection and automatic manual conversion function, the operation is very reliable. And good performance, flexible control, anti-interference ability Efficiency: The device to adjust the pump speed according to user changes in water, the pump is always working in the high zone, energy-saving effect is obvious, than the constant speed pumps can save 35%. Simple: "water supply equipment Promotion Center" is always at the forefront of technological development of water supply equipment. A new generation of water supply equipment with automatic control, PID regulation, keyboard, man-machine interface (text, numbers) display. The operator simply convert cabinet switch, users can achieve the required conditions, to achieve automatic unattended. Protection function: a perfect overload, short circuit, overvoltage, undervoltage, phase, overcurrent, short circuit, water shortage and other automatic protection. In exceptional circumstances can signal alarm, self-test and fault diagnosis. Occupies less easy installation: only one set of complete equipment supply control cabinets and pump unit, installation is very simple and convenient. Extend the life of pumps and motors: for more than one pump can achieve reliable soft-start, make the grid and pipeline avoid impact, and take turns running, greatly extending the life of pumps and motors. No negative pressure water Scope: There is pool-rise buildings, hotels, schools, residential area towns, enterprises and institutions, the new rural construction of rural domestic water. Factories, industrial and mining production water or life. All kinds of water plants, water supply stations, sewage water plant, agricultural irrigation and other water supply and drainage stations. High-rise, residential, enterprises centralized hot water supply. Production and life of the cooling water, circulating water pressure. Oil pipelines, oil depots, gas stations and other constant pressure oil. Sales of small Europe: 159-7414-3465 Online QQ: 1922601218 nationwide toll-free hotline: 400-086-8955 Address: Yuhua District, Italy all the way to the modern business center B4062 Star Factory Address: Changsha City Lituo Industrial Park (welcome all customers to visit the factory equipment)