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Requirements for the use of regulating valves in modern industry
- Jul 21, 2018 -

The advanced modern industry is marked by production automation. From the development history and progress of automation system, the change of technical tools plays a very important role. Various advanced control methods have been emerging, but the basic control laws have not changed, and the improvement of technical tools is changing rapidly. The development and use of intelligent instruments has created a bright future for industrial automation. The typical automatic control system consists of three parts: detection, control, and implementation of three parts. In recent years, the impact of digital technology and microprocessor technology on measuring instruments and control instruments has become obvious to all, and the link of the actuator, especially the regulating valve of the main products, has also made great progress. The traditional control 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 the standard of product quality, how to operate more effectively and safely, how to make full use of resources, save energy and protect the ecological environment, people are recalling the higher requirements of the regulating valve. These requirements can be summarized as follows: the quality is more stable, the work is more reliable, the operation is more reliable, and the operation is more reliable. More safely in process control, the control valve contacts directly with the fluid once the fault occurs, the consequences are unthinkable.

In the oil industry, from oil fields to refineries, all kinds of production equipment are centralized monitoring and controlling in a large scale. Most of the operating conditions are carried out under high temperature, low pressure or high temperature and high pressure. The medium is all kinds of oil products of inflammable and explosive oil. Therefore, the reliability and fire resistance of the regulating valve are mentioned first. In the chemical industry, the variety of the process and the change of the process conditions, in the control and execution of the four thermal variables of temperature, pressure, flow and level, there are very special problems that require the adjustment valve to be applicable.

In the power industry, the thermal power plant should control the boiler. It is very important to keep the water level in the boiler regulating system. It is important to avoid the misoperation and mistake of the valve. In order to ensure the performance and reliability of the regulating valve, the following requirements must be fulfilled:

1, the selection of the regulating valve of the regulating valve should be strictly calculated; the type, the caliber and the performance should conform to the requirements; the material of various parts of the regulating valve should be strictly selected, the strength and stiffness should be sufficient, and the test of pressure test and air tightness should be passed according to the national standard. The manufacturing technology and testing methods of the manufacturer must meet the standards and be endorsed by the competent department. It is strictly forbidden to produce small factories that do not have production conditions.

2, ensure reliable operation. This does not refer to the manufacturing quality of the regulator itself, but also includes the training of operators and the improvement of their quality. In order to prevent misoperation, technicians must pay attention to the notices listed in the nameplate. According to our country's new pneumatic regulating valve standard (GB/T4213-92) pneumatic actuator nameplate at least to mark the factory name, product model, rated flow coefficient, design number, product number and manufacturing years and other matters. The valve body should be cast or washed out the arrow and DN value indicating the direction of the medium flow, and the words and values of PN.  Important valves should have enough accessories, such as positioners, limit switches, etc. There should be enough installation space and operating space, adequate installation space and operation, adequate lighting and strict operation procedures.

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