Electronically controlled pneumatic valves intelligent question 5

and drainage of the application of low voltage electrical control of large diameter there are two main types of pneumatic valve control method at present. One is to use the VA C ac drive, another is to use dc power drive. Ac power generally is used to control the large pneumatic valve of moving, but under the control of the actual situation, often not easy to get the ac power, and also can give users or extra electricity consumption management part of the burden, so in the low pressure pipeline, is not the best way of control. Drive system, dc power supply in general is to use no more than VDC adapter power supply or batteries, using the hydraulic pressure in the pipeline, water drive control on and off the electric pneumatic valve, electromagnetic pneumatic valve actuator, etc. Among them, the battery can minimize the influence of electromagnetic interference to control system, and no need at the scene with the ac power, reduce both the control of interest and improve the reliability of the product, as a result, the battery power supply mode is widely adopted.
at present USES the disposable lithium batteries and alkaline batteries. In contrast, battery power solutions. An equal volume of lithium battery can store much more power than alkaline batteries, thus can also use a longer time, so use lithium-ion batteries on the market at present as large diameter pneumatic valve electric power source is still the mainstream. But lithium battery itself exists passivation on a certain level ( Also called memory effect) Prone to failure, more south ring, not the problem of environmental protection, if plus hard to ensure the consistency of the lithium battery, different load leads to different factors such as discharge curve, practical applications, the lithium battery also exist to let users and manufacturers can't control the problem.
currently used in weak current control pilot pneumatic valve ( The pilot of pneumatic valve is different from the stated earlier large diameter pneumatic valves) Whether the electromagnetic type, on the other hand. Or on the principle of electric machines are driven by weak current leading pneumatic valve of pneumatic valve sealing pressure cavity ( Both pressure cavity) Pressure to achieve using the pipe hydraulic pneumatic valve (the main As stated earlier, large diameter pneumatic valve main body) Or pneumatic valve seal open in the same way, the purpose of through closed pressure cavity, in order to achieve the use of the purpose of the cavity pressure closed the valve on the main pneumatic water supply pipeline in practical use, but in countries has been presented because of long time water quality problems cause blockage, the forerunner in the pneumatic valve flow guide hole pressure pneumatic valve stem adsorption iron particles or tiny grains of sand were jammed pneumatic valve stem, plus some designers lack of practical experience, field condition to estimate shortage, the design phase, pneumatic valve drive circuit and control software design flaws, the high failure rate of this kind of pneumatic valves in temporary work.
the current domestic water supply and drainage of low pressure pneumatic valve is basically simple mechanical or electrical control, or even manual control, low level of intelligence. Some products adopted RS - in the application Infrared, GSM, in addition to the above problems. Zigbe communication methods such as centralized or remote management, from a certain level to improve the intelligent level of the products, but also have insufficient, in the application of the existence of more or less the communication rate is low, the project cost is high, the failure rate is high, the network is not flexible, network capacity is limited, the power consumption of large, complex problems such as protocol, both increased the development difficulty of designers, and restricted the user management level enhancement, especially in the business link with water, bring convenience to charge management. To sum up, the power supply source, the daily maintenance of pneumatic valve actuator, the intelligent control and management is the thin part of the current pneumatic valve application, need to explore a kind of economic, reliable and universal technology and solutions, improve the existing electric pneumatic valve application of pneumatic valve.