February 2021

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 the canvas of the 2003 version, one respondent […]

The 3-line bypass and equalizer combination pictured above allows the end user to achieve a variety of results. By keeping the upper valve closed and opening the two lower valves, the “bypass” part of the combination allows for “warming” of the downstream pipe prior to opening the large primary valve, thus reducing “cold shock”, and it