according to API608 trunnion valves shall have a test plug to test seats. So I'm wondering how to test a seat. Is there anyting I have to look at?Thanks in advance. Oh yes! Relevant valve test procedures according to the plant or local authorities or end user, which again should refer to the international recognized authorities standard tests. Also relevant for fluid application type and pressure. Emissions through stem sealings?Even if the valves are produced to the API requirements local end users could require tests according to other standards, depending where you are in the world.If tested mounted in pipelines other procedures may prevail.If you are the buyer, buy valves already factory tested, and if overhaul include tests in your inquiry / specification for overhaul.i just want to share how seat test is done coz we often make a test pressure for the offshore valve.regarging API standard usually we make low test pressure or hydro test and depend on the valve characteristic.for the seat test we only focus on the inlet n sometime we dont have to flange the oulet.its depend on the customers required.hence seat test can be done easily.

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