Steam valve quality appraisal

Steam valve is a valve used to control the flow of steam in pipes and equipment. It controls the flow of steam by opening or closing the takeover pipe.

steam valve is mainly composed of valve body, valve disc, valve seat, operating mechanism, etc. When the steam flows, the valve is operated through the operating mechanism, thereby changing the opening degree between the valve disc and the valve seat, and controlling the flow and pressure of the steam.
In steam valve quality appraisal cases, Zhongke Testing can provide steam valve quality appraisal services.

1. Valve material: The material of high-pressure steam valve must have high temperature, high pressure, corrosion and other characteristics, and be able to withstand long-term use.
2. Valve design: The design of high-pressure steam valves needs to comply with national standards and user requirements. The structure of the valve must be reasonable, and the contact area between the valve disc and the valve seat must be large enough to ensure good sealing performance.
3. Valve manufacturing: The manufacturing of high-pressure steam valves must comply with national standards and user requirements, and adopt scientific, reasonable and advanced manufacturing technology to ensure valve quality.
4. Valve installation: The installation of high-pressure steam valves must be carried out in accordance with national standards and user requirements. The correct cooperation between the valve and the pipeline should be ensured to avoid the impact of pipeline stress and external forces on the valve.
5. Valve maintenance: The maintenance of high-pressure steam valves must be carried out regularly. Check the use of the valve regularly and find problems in time to avoid accidents.

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2

A valve leak occurred in a biochemical company, and high-temperature steam erupted, causing an operator to be severely scalded on the spot. According to the employee, when the valve was being trialled, the bolts fell off due to quality problems, the valve was pushed open by the gland, and steam erupted instantly, scalding him seriously. The company believes that the valve quality problem should be compensated by the manufacturer, the Electromechanical Equipment Company. However, the mechanical and electrical equipment company believed that the biochemical company's improper operation had nothing to do with it. As a result, both parties resolved the issue through legal channels.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" with the steam valve involved in the case.
appraisal analysis results: The
appraisal analysis expert group discussed the relevant information and on-site investigation of the steam valve involved in the case and made a comprehensive quality and technical analysis, and made the following suggestions and conclusions: The tensile strength value of the
valve involved in the case is far lower than the specified value; the center-mouth connecting bolt is not tightly engaged with the thread and cannot play a tightening role; the thermal supply steam parameters are normal and stable, and will not cause additional pressure on the valve.
In summary, the main reason for the accident was the defective quality of the valve.