QRC Valves

February 2021

Class Seat Leakage

NEWS & RESOURCES FEBRUARY 10, 2021 Class Seat Leakage HYDRO TESTING – CLASS I to IVCLASS SEAT LEAKAGEThe term “Class” seat leakage comes from ANSI / FCI 70-2. This is a control valve seat leakage specification and does not apply to gates and globes used for on/off service. In ANSI / FCI 70-2, the forward states, “During …

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