Key Quality Control Points in the Manufacturing Process of American Standard Cast Steel Globe Valves

Key Quality Control Points in the Manufacturing Process of American Standard Cast Steel Globe Valves

Abstract: As a high-end industrial valve product, the quality control of the manufacturing process of American standard cast steel globe valves is crucial. This article provides a detailed analysis of the key quality control points in the manufacturing process of American standard cast steel globe valves from the aspects of casting blanks, processing technology, inspection and testing, and personnel quality, and proposes corresponding measures, providing a certain reference for China's American standard cast steel globe valve manufacturing industry.

1、 Introduction

American standard cast steel globe valves are widely used in industries such as petroleum, chemical, and power, and their product quality directly affects production safety and service life. With the continuous development of China's valve manufacturing industry, the manufacturing level of American standard cast steel globe valves has been greatly improved, but there are still certain problems in quality control. In order to improve the product quality of American standard cast steel globe valves in China and reduce the failure rate, this article deeply explores the key points of quality control in the manufacturing process.

2、 Quality control of casting blanks

1. Raw material selection: Select high-quality carbon steel or alloy steel to ensure that the chemical composition, mechanical properties, and physical properties meet the standard requirements.
2. Refining process: Using electric arc furnace melting, combined with vacuum refining, degassing and other processes, to reduce gas content and inclusions.
3. Casting process: Advanced casting processes such as resin sand and lost foam are used to improve casting accuracy and reduce defects such as sand holes and air holes.
4. Casting inspection: Inspect the dimensions, appearance, internal defects, and other aspects of the castings to ensure the quality of the blank.

3、 Quality control of processing technology

1. Mechanical processing: High precision CNC machine tools, specialized fixtures, and cutting tools are used to ensure the machining accuracy of the parts.
2. Heat treatment: Based on material properties and part requirements, select a reasonable heat treatment process to eliminate internal stress and improve part performance.
3. Surface treatment: Adopting surface treatment processes such as spraying and painting to improve the corrosion resistance of valves.
4. Assembly process: Develop a reasonable assembly process to ensure flexible valve action and reliable sealing.

4、 Inspection and testing quality control

1. Raw material inspection: Conduct chemical composition, mechanical properties, and other inspections on incoming raw materials to ensure their quality.
2. Process inspection: Inspect key processes and special processes to promptly identify problems and prevent the production of non-conforming products.
3. Finished product inspection: Conduct performance tests, sealing tests, etc. on the finished product to ensure that it meets the standard requirements.
4. Inspection records: Establish a sound inspection record system to provide a basis for product quality traceability.

5、 Personnel quality and training

1. Improve employee quality: Recruit employees with relevant professional backgrounds and skills to enhance overall quality.
2. Training and assessment: Regularly conduct skill training to improve employees' operational skills and quality awareness, implement assessment systems, and motivate employees to improve their quality level.
3. Quality culture construction: Strengthen the construction of enterprise quality culture, improve employees' sense of identification and responsibility for quality work.

6、 Conclusion

The key points of quality control in the manufacturing process of American standard cast steel globe valves mainly include casting blanks, processing technology, inspection and testing, and personnel quality. By strictly controlling these key links, China's American standard cast steel globe valve manufacturing industry is expected to achieve comprehensive improvement in product quality. At the same time, enterprises should continuously explore new technologies and processes, improve product quality, and contribute to the development of China's industry.