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Shangrao no negative pressure water equipment self-diagnostic function: drive can automatically detect failures, sensors determine the short-term damage. 6. Shangrao no negative pressure water equipment second pre-set function: dual voltage control, in life or production sharing firefighting system, easy to use, in the normal water supply pipe network system is first set pressure. Shangrao frequency without negative pressure water equipment ① pipe network characteristics and influencing factors grasp. Frequency without negative pressure water equipment www.saintbox.cn ② grasp the significance of pumps and fans in the pipe network system operating point, and analysis of qualitative operating point spike. ③ understand the phenomenon and its fan surge prevention method. ④ understand the effect of pump and fan systems concepts in the pipe network system and method for reducing the effect of the system. ⑤ master joint working pump and fan purposes, changes in the operating point and performance analysis. ⑥ master pump and fan speed adjustment mode and movable blade adjustment method, the gas alone understand throttle adjustment mode. ⑦ tear gas pump control principles and for pump and fan mounting position in the request. ⑧ grasp the principle of selection of pumps and fans. Shangrao frequency without negative pressure water equipment and towns due to the concentration of urban water supply, water consumption increased dramatically, water shortages reflect the city first., At present, the city water has become a common phenomenon worldwide, attracted national attention. 1972 United Nations Conference on "Human Environment" summary states: "all over the world in many areas due to the expansion of industrial and consumption per capita increased water demand has increased over the natural source of the situation, take the scorpion groundwater and contaminated, as provide appropriate cleaning industry's growing population and expansion of water, is a complex technical problem in many countries, economic and political, but also deepening among problem. "frequency without negative pressure water equipment (www.saintbox. cn) connection Shangrao frequency without negative pressure water pipe network equipment Shangrao large frequency without negative pressure water equipment engineering often requires a multi-stage fluid distribution network shared task. Different conditions and requirements for pipe connection gateway levels hydro and thermal methods and inter-relationships are different. Hydraulic parameters such as pressure and flow rate to generate interaction between the pipe network, the project is called hydraulic pipe interconnection related, otherwise unrelated to water. Fluid temperature between the pipe network and other thermodynamic parameters have a mutual influence on heat-related project called tube gateway, otherwise unrelated heat. Shangrao frequency without negative pressure water pipe network equipment must be carried out at all levels of hydraulic conditions and thermal analysis and regulation of working conditions in the interconnected state. In order to weaken the correlation between hydraulic pipe interconnection, Xinyu frequency without negative pressure water equipment is normally set pressure regulator and other devices (such as voltage regulators, voltage regulators, water pump and pressure tank, etc.) in the pipe network boundaries. In order to adjust the heat pipe interconnection relevance, Xinyu no negative pressure water equipment is normally set thermal regulating device (such as a jet, mixing pumps and mixing tee, etc.) in the pipe network connection. Xinyu is no negative pressure water equipment pipe gateway connection can be divided into two categories: direct and indirect connection connection. Directly connected network, the fluid to pass through the tube at all levels of interconnection of demarcation between the two stages in the pipeline and a direct mixing fluids, hydraulic pipe network levels are related. Indirect network connections, fluid levels can not cross the boundaries of pipe interconnection, and between the two stages in the pipeline is not in direct contact with the fluid, hydraulic pipe interconnection is irrelevant, but the tube is heat related interconnection. Xinyu no negative pressure water equipment