Advanced modern industry is marked by production automation. From the development history and progress of automation system, the change of technical tools plays an extremely important role. Various kinds of advanced control methods are constantly emerging, but the basic rules of control have not changed. The improvement of technical tools is changing with each passing day. The development and use of intelligent instruments more for industrial automation to create a better future. Typical automation control system has three main parts: detection, control, the implementation of three parts. In recent years, testing instrumentation and control instrumentation by digital technology and microprocessor technology changes occur for a moment to see, and this part of the actuator, especially as the main product of the control valve, but also great progress. Traditionally used control valve basically meet the needs of many industrial systems, but with the large-scale development of modern industry. How to produce more and better advanced products, how to improve product quality standards, how to operate more effectively and safer, how to make full use of resources, save energy and protect the ecological environment, people recall that the regulating valve put forward higher requirements , These requirements can be summarized as follows: More stable quality, work more reliable, safer operation In the process control, the control valve in direct contact with the fluid in the event of failure, the consequences could be disastrous. In the oil industry, from oilfields to oil refineries, all kinds of production facilities are centrally monitored and controlled on a large scale. Most of the operating conditions are carried out under high temperature and low pressure or under high temperature and pressure. The mediums are all flammable and explosive oils All kinds of oil, therefore, the reliability and fire control valve was mentioned in the first place. In the chemical industry, the process of diversity and process conditions change, the temperature, pressure, flow and level of the four major thermal variables in the control and implementation, there are very special problems require regulatory valve can be applied. In the power industry, the thermal power plant to control the boiler, boiler control system to maintain the normal water level is essential to avoid misoperation of the control valve, double what is important. In order to ensure the working performance and reliability of the control valve, the following requirements must be met: 1. To ensure the quality of the control valve. The selection of the control valve is subject to rigorous calculation; the type, caliber and various properties shall meet the requirements; Parts of the material to be rigorously selected, to have sufficient strength and stiffness, in accordance with national standards through the pressure test, tightness and other tests. Manufacturers of manufacturing technology and testing methods must meet the standards, to be recognized by the competent authorities. It is strictly forbidden to produce small factories that do not have the production conditions. 2, to ensure reliable operability Here does not mean that the quality of the valve manufacturing itself, but also to the training of operators and improve the quality. In order to prevent misuse, process personnel must pay attention to the nameplate marked the precautions. According to our new pneumatic control valve standard (GB / T4213-92) pneumatic actuator nameplate at least indicate the manufacturer name, product type, rated flow coefficient, design number, product number and manufacturing date and other matters. The body should be cast or punched out of the media flow direction of the arrow and DN values ​​and PN words and values. Important valve must have enough accessories, such as locators, limit switches. Have enough installation space and operating space, adequate installation space and operation, adequate lighting, strict operating procedures.
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