Valve quality appraisal

Poor valve quality can cause the valve to break. Valves are important equipment used to control the flow and pressure of fluids in pipelines. If the valve quality is poor, it may cause the following problems: 1. The valve seal is poor, resulting in leakage and uncontrollable fluid. 2. The valve is not strong enough to withstand the high pressure and temperature in the pipeline, causing the valve to break. 3. Improper selection of valve material cannot adapt to the fluid characteristics in the pipeline, resulting in valve failure.
Therefore, in order to ensure the safe operation of pipelines, the quality of valves must be guaranteed. Choosing a high-quality valve and proper installation can reduce the risk of valve breakage.
Zhongke Testing provides accident identification services, which can identify whether there are quality problems related to valves, issue professional and reliable inspection reports, and assist courts and enterprises in resolving product quality disputes.

JB/T 6446-2004 Vacuum valve
CJ/T 319-2010 Foot valve
NB/T 47044-2014 Power station valve
HB 908-2000 Hydraulic one-way valve
HB 909-2000 Hydraulic one-way flow-limiting valve
HB 911-2000 Air-conditioning high-pressure single-phase valve
CB/T 4348-2014 Class A valve technical conditions
HB 2975-2000 Low-pressure safety valve
JB/T 13458-2018 Insulation jacket valve
GB/T 12221-2005 Metal valve Structural length
GB/T 19672-2021 Pipeline valve Technical conditions
0GB/T 13927-2008 Industrial valve Pressure test
1SY/T 7058-2016 Subsea pipeline valve specification
2SY/T 6960-2013 Valve test fire resistance test requirements

The steam cap of a steam pipe valve in a factory was pushed open by steam. The high temperature caused a worker to be seriously scalded. The factory suspects that the cause of the accident was a problem with the quality of the valve. Therefore, we were entrusted to our company to conduct a technical appraisal on the reason why the valve was pushed open by steam.
The expert team rushed to the scene to investigate the accident environment, and at the same time sampled and inspected the valve involved, and finally came to the following conclusions:
1. The tensile strength of the valve material was far lower than the standard value;
2. The middle port connecting bolt did not match the thread and could not lock;
3. The other parts of the lid steam boiler were operating normally;
4. The valve material was substandard and the manufacturing process was defective, leading to the accident.