The advanced modern industry is marked by production automation. From the development history and progress of automation systems, the change of technical tools plays an extremely important role. Various advanced control methods have emerged, but the basic control laws have not changed, and the improvement of technical tools is changing with each passing day. The development and use of smart meters has created a bright future for industrial automation. A typical automated control system has three main components: detection, control, and execution. In recent years, the detection instruments and control instruments have been affected by the influence of digital technology and microprocessor technology, and the actuators, especially the regulating valves as the main products, have made great progress. Traditionally used regulating valves 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 safely, how to make full use of resources, save energy and protect the ecological environment, people recall that higher requirements are imposed on regulating valves. These requirements can be summarized as follows: more stable quality, more reliable work, and safer operation. In process control, the valve is directly in contact with the fluid. Once the fault occurs, the consequences are unimaginable.
In the petroleum industry, from the oil field to the refinery, all kinds of production equipment are centralized monitoring and control on a large scale. Most of the operating conditions are carried out under high temperature and low pressure or high temperature and high pressure. The medium is all kinds of flammable and explosive oil. Various oils, therefore, the reliability and fire resistance of the regulating valve are mentioned first. In the chemical industry, the diversity of processes and changes in process conditions have very special problems in the control and execution of the four thermal variables of temperature, pressure, flow and liquid level.
In the power industry, thermal power plants need to control the boilers. It is important to keep the water level in the boiler regulating system, and it is important to avoid mis-opening and mis-closing of the regulating valves. In order to ensure the performance and reliability of the regulating valve, the following requirements must be met:
1. Ensure that the quality control valve of the regulating valve is subject to strict calculation; the type, diameter and performance must meet the requirements; the materials of various parts of the regulating valve must be strictly selected, and have sufficient strength and rigidity to follow The national standard passes the pressure test, air tightness and other tests. The manufacturer's manufacturing technology and test methods must meet the standards and must be approved by the competent authority. Small factories that do not have production conditions are strictly prohibited from producing.
2, to ensure reliable operation here does not refer to the manufacturing quality of the regulating valve itself, but also includes the training and quality of the operator. In order to prevent misuse, the craftsman must pay attention to the precautions marked on the nameplate. According to China's new pneumatic regulating valve standard (GB/T4213-92), the nameplate of the pneumatic actuator must at least mark the manufacturer's name, product model, rated flow coefficient, design number, product number and manufacturing year and month. The arrow and DN values ​​indicating the direction of flow of the medium and the words and values ​​of PN should be cast or punched out on the valve body. Important valves must have enough accessories, such as positioners, limit switches, and so on. Have enough installation space and operation space, have enough installation space and operation, have enough lighting, and have strict operating procedures.
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Label: Industrial use and requirements for regulating valves
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