The industrial used for adjusting and requirements

Modern industry is based on advanced production automation marked. From the perspective of the development history and progress of automation system, technical tool change plays a very important role. All kinds of advanced control method appear constantly, but the basic control law have not changed, and the tools of technology improvement is changing. The development of the intelligent instrument and use more industrial automation created a better future. A typical automatic control system has three main areas: detection, control, the three most. In recent years, instrumentation and control instrument under the influence of digital technology and microprocessor technology become visible, and actuators this link, especially as the main products of the regulator, also has a great progress. Traditional use of regulating valve basically meet the needs of many industrial systems, but with the qu the large-scale development of modern industry. Advanced how to produce more and better products, how to improve the product quality standard, how to be more effective and more safely operation, how to make full use of resources, save energy and protect the ecological environment, the people have higher requirements are put forward on the regulating valve, these demands can be summarized as follows: quality is more stable, more reliable and safety in the process control, operation control valve and fluid phase directly contact in the event of failure, consequence is unimaginable. In the oil industry, from oil to refineries, production of various devices are centralized monitoring and control on a large scale, most of the operating conditions are to be carried out under high temperature and low pressure or high temperature and high pressure, medium are various inflammable and explosive oil oils, therefore, the reliability of the regulating valve and fire retardancy mentioned first. In the chemical industry, the diversity of process and the change of process conditions, the temperature, pressure, flow rate and liquid level in the four thermal variable control and the execution, has a very special problem requires the regulator to apply. In the electric power industry, should control boiler in thermal power plant, is very important to maintain the normal water level in boiler control system, avoid the regulator driving by accident, how important they are to the right of the double. In order to ensure the working performance and reliability of the control valve, it is necessary to do the following requirements: 1, to ensure the quality of the regulating valve selection of regulating valve should pass the strict calculation; Type, diameter, and various performance meets the requirements; Regulator to strict selection of materials, various parts should have sufficient strength and stiffness, according to the national standard through the pressure test, air tightness test, etc. Manufacturer's manufacturing technology and test method must conform to the standard, to sign approved by the competent department. It is forbidden to do not have small factory production conditions to production. 2, ensure reliable operational injustice here refers to the manufacturing quality of the regulator itself, but also to improve the operating personnel training and quality. In order to prevent wrong operation, technology personnel must be marked on the namplater of the attention points for attention. According to the new pneumatic control valve standards ( GB / T4213 - 92). Pneumatic actuator nameplate at least to mark manufacturer name, product model, rated flow coefficient, design a number, product number and manufacturing time. The valve body shall be cast out or out of the medium flow direction arrow and DN and PN words and values. Valves are important to have enough accessories, such as locator, limit switch, etc. To have enough installation space and operating space, have enough installation space and operation, there is enough lighting, there are strict procedures. The industrial used for adjusting and requirements of domestic high-end valves from import dependence is not a dream of the water supply and drainage valves industry in our country development present situation and future prospects