February 2021

HYDRO TESTING – CLASS I to IVCLASS SEAT LEAKAGE The term “Class” seat leakage comes from ANSI/FCI 70-2, a specification that applies exclusively to control valve seat leakage. It does not apply to gate or globe valves, which typically serve in on/off service rather than throttling applications. Despite this distinction, some end users mistakenly specify […]

Understanding the 3-Line Bypass and Equalizer Combination in Gate Valves A 3-line bypass and equalizer combination plays a crucial role in ensuring safe, efficient valve operation in high-pressure systems. This design allows users to warm downstream piping, reduce torque requirements, and prevent overpressurization within the valve body. In this article, we will explore how the