At present, there are two main control methods for low-pressure electronically controlled large-diameter valves in drainage applications. One is to use 220VAC AC drive and the other is DC drive. AC power is generally used to control large-scale direct-acting valve, but the actual situation of the field control, often not easy to get AC power, and additional power consumption will give the user or management part of the burden, so in the low-pressure pipe, not The best way to control. DC power drive mode is generally not more than 24VDC adapter power supply or battery-powered, the use of the pipeline pressure, drive control water on-off motor valve, solenoid valve and other transmission mechanism. Among them, the battery-powered to minimize the impact of electromagnetic interference on the control system, without the need to be equipped with AC power at the scene, reducing control costs and improve product reliability, therefore, the battery-powered approach is commonly used. Battery-powered solutions, the current use of disposable lithium batteries and alkaline batteries. Relatively speaking, the same volume of lithium batteries can store more electricity than alkaline batteries, and therefore can be used for a longer period of time. Therefore, it is still the mainstream to use lithium batteries as the electronically controlled power source for large-diameter valves on the market. However, the lithium battery itself to some extent there is passivation (also known as memory effect), easy to failure, more South, not environmentally friendly, if coupled with the consistency of lithium batteries is difficult to guarantee that the load caused by different discharge Different curves and other factors, in practical applications, lithium batteries also exist for users and manufacturers can not control the problem. On the other hand, the pilot valve currently used in weak control (this pilot valve is different from the large-diameter valve described above), either electromagnetic or motor type, is based on the principle of a weakly actuated pilot valve pair Pressure relief valve cavity (both pressure relief cavity) for pressure relief, in order to achieve the use of water pressure in the pipeline will be the main valve (ie the aforementioned large-diameter valve main valve body) or the valve seal opened the same purpose, it also By closing the pressure relief chamber, in order to achieve the purpose of closing the main valve using the water pressure in the chamber. However, in the actual use of water supply pipelines in our country, problems such as blockage of diversion holes in the pilot valve due to long-time water quality problems, sticking of the stem by the pressure-relief valve stems caused by the adsorption of iron particles or tiny grit, The lack of practical experience on some designers, on the scene underestimated the situation, in the design phase, the valve drive circuit and control software design flaw, resulting in such valves in the long-term high failure rate. In addition to the above problems, the current domestic low pressure water supply and drainage valve is basically a simple mechanical or electrical control, or even manual control, low level of intelligence. Some products in the application of the use of RS-485, infrared, GSM, Zigbee and other means of communication for centralized or remote management, although to a certain extent, increased the level of product intelligence, but there are also deficiencies in the application, more or less The problems of low communication speed, high engineering cost, high failure rate, inflexible networking, limited network capacity, large power consumption and complicated protocols have not only increased the difficulty of designers' development but also hindered the improvement of user management level, Especially in commercial water links, to bring inconvenience to the charge management. In summary, for the power supply, valve actuator routine maintenance, intelligent control and management of the current valve application of the weak links need to explore an economical and reliable and generally applicable technologies and solutions to enhance the existing electric control valve The application of the valve. This article related text search: valves