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Thanks Mr. Hitokiriaoshi for your elaborate responses. It was very helpful. We are suspecting only seat memory issue, Can you explain further on the below 1. Any standard or reference that seat test will damage the seats 2. Any standards referring that the testing sequence(high pressure seat...

HI Engineers! I'm a procurement engineer from Oil & Gas Indusry in UAE , we ordered Fully welded ball valve 16" Class 600 ,from a Malaysian manufacturer for our metering skid project, since those valves are tight shut off valves, they have to be tested at Field ( in UAE before installing to...