Current industrial use and requirements for regulating valves

The advanced modern industry is marked by production automation. From the perspective of the development history and progress of automation systems, the change of technical tools plays an extremely important role. Various advanced control methods are constantly emerging, 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 have created a better future for industrial automation. The typical automation control system mainly has three links: testing, control, and execution. In recent years, detection instruments and control instruments have been affected by the impact of digital technology and microprocessor technology, and the actuators, especially those that are used as the main products, have made considerable progress. The traditionally used regulating valve basically meets 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 efficiently and safely, how to make full use of resources, save energy, and protect the ecological environment, people recalled that after the higher requirements for regulating valves These requirements can be summarized as follows: More stable quality, more reliable work, and safer operation In the process control, the direct contact of the regulating valve with the fluid will lead to disastrous consequences.

In the oil industry, from the oil field to the oil refinery, various production facilities are monitored and controlled on a large scale. Most of the operating conditions are performed under high temperature, low pressure or high temperature and high pressure. The medium is a variety of flammable and explosive oils. Various oil products, therefore, the reliability and fire resistance of the regulating valve were mentioned first. In the chemical industry, the diversity of processes and the change of process conditions have very special problems in the control and execution of the four major thermal variables of temperature, pressure, flow, and liquid level, requiring the use of a regulating valve.

In the power industry, the thermal power plant must control the boiler. It is very important to maintain the normal water level in the boiler regulation system, and to avoid accidental opening and closing of the regulating valve. How important is the double. In order to ensure the operating performance and reliability of the regulating valve, the following requirements must be fulfilled:

1. Ensure that the selection of the quality control valve of the regulator valve is subject to rigorous calculation; the type, bore diameter and performance must meet the requirements; the materials of the various parts of the regulator valve must be strictly selected, and sufficient strength and rigidity must be followed. The national standard passes the pressure test and hermeticity test. The manufacturer's manufacturing techniques and test methods must meet the standards and the approval must be signed by the competent authority. It is forbidden for small factories that do not have production conditions to carry out production.

2, to ensure reliable operation here is not public refers to the quality of the valve itself, but also includes the training of operators and the improvement of quality. In order to prevent misuse, craftsmen must pay attention to the notices on the nameplate. According to China's new pneumatic valve standard (GB/T4213-92), the name plate of the pneumatic actuator must at least indicate the manufacturer's name, product model, rated flow coefficient, design position number, product number, and year of manufacture. On the valve body, arrows and DN values ​​indicating the direction of flow of the medium and the words and values ​​of the PN should be cast or punched out. Important valves must have enough accessories, such as positioners, limit switches, etc. There must be adequate installation space and operating space, adequate installation space and operation, adequate lighting, and strict operating procedures.