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Soft seal trunnion mounted ball valves for Oil & Gas
Quality Control

Quality is the life of YFL.

YFL quality control system is executed strictly to cast brand and forge reputation.


All YFL valves are tested by advanced inspection equipments according to different international inspection standards and requirements to make sure all YFL valves leave the factory with top class quality and work well at site with excellent performance to solve problems, improve process and create values.

We are deeply aware that the quality of valves is vitally important to the safety of industrial production and municipal construction.

YFL shoulders the responsibility to insure the safety all the time.


The test and inspection of YFL valves mainly include positive material identification (PMI) test, impact test, wall thickness test, coating thickness test, ultrasonic flaw detection, penetration test, magnetic particle test, X-ray radiographic test, pressure seal test, low fugitive emission test, cryogenic test, fire safe test, working life test and functional test etc.


YFL valves are always ready to be tested by third party inspection institution like SGS, TUV, Lloyd's Register and so on.


Materials Test


PMI test



Seal Test





Functional Test



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