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.
The traditional control 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 effectively and safely, how to make full use of resources, how to save energy, and how to protect the ecological environment, people put forward higher requirements for the control valve. These needs can be summarized as follows:
1、 More stable quality, more reliable operation and safer operation
In the process control, the regulator is in direct contact with the fluid. Once it breaks down, the consequences are unimaginable.
In order to ensure the working performance and reliability of the control valve, the following requirements must be met:
1. Ensure the quality of control valve
The selection of control valve shall go through strict calculation; the model, caliber and performance shall meet the requirements; the materials of each part of control valve shall be selected strictly, with sufficient strength and rigidity, and shall pass pressure test, air tightness test and other tests in accordance with national standards.
2. Ensure reliable operation
According to the newly issued standard of pneumatic control valve (GB / t4213-92), the nameplate of pneumatic actuator shall at least indicate the manufacturer's name, product model, rated flow coefficient, design number, product number and production date.
The arrow and DN values indicating the flow direction of the medium, as well as the characters and values of PN, shall be cast or punched out on the valve body. Important valves should have proper accessories, such as positioner, limit switch, etc. There is enough space for installation and operation.
3. Emergency equipment
In case of failure of high-pressure gas equipment, in order to prevent direct damage to other equipment, a stop device must be installed on the pipeline connected with the equipment, and a quick stop valve shall be installed if necessary.
Second, protect the environment
The importance and necessity of protecting nature and living environment are well known. Air pollution and noise are the main environmental pollution caused by regulating valve.
1. In order to prevent air pollution, the sealing part of the valve shall not leak.
2. Noise prevention
Third, energy conservation
In the process of using and adjusting, the structure of energy-saving valve should be adjusted, used, installed and maintained.
1. Use low impedance valve
2. Improve the sealing performance of valve core and valve seat
3. Try to use electric actuator
Applicable to new energy
For a long time, oil is the main energy. In recent years, many new energy sources (liquefied natural gas, liquefied coal slurry, atomic energy), from processing to production, transportation, storage, put forward more special requirements for the control valve.
Compared with the conventional control valve, the design, manufacture, test, inspection and use of the control valve are more special and strict. In order to ensure safety, it must be ensured from all aspects.
There will be more problems in the future. In order to solve these problems, it is necessary to improve the old process control system or create a new process control method, and the new system will have higher requirements for regulators.
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