56. Tips for Check Valve Selection and Installation - Brian Strait and Noah Miller

Tips for Check Valve Selection and Installation. Check valves are installed in many piping systems. Their purpose is to allow flow in only one direction, which can be critical for plant safety and to protect equipment from damage. There are a few different check valve designs, including swing check valves and spring-loaded poppet-style check valves. Understanding which type is best for a given application and ensuring valves are properly installed is vital to success. Noah Miller, applications/engineered sales manager with Check-All Valve Manufacturing Co., and Brian Strait, business development and marketing manager with Check-All Valve, explained the differences between check valve designs, and offered installation and sizing tips as guests on The POWER Podcast. Check-All Valve is a West Des Moines, Iowa-based manufacturer of industrial spring-loaded poppet-style check valves. Miller explained that piston poppet check valves have two main advantages over swing check valves. The first concerns water hammer, which is hydraulic shock caused when water stops or changes direction suddenly. “Once that wave gets to the swing check, it'll push that clapper closed and actually slam it shut, which will promote that water hammering effect,” Miller said. However, the spring inside a piston poppet-style check valve helps minimize, and may even eliminate, water hammer, because it closes the valve before the pressure way arrives. “The secondary aspect or advantage of the piston poppet over a swing check is installation orientation,” Miller said. “A swing check is only supposed to be installed in a horizontal-flow position. Whereas, a spring-loaded piston check can be vertical-flow up, vertical-flow down, 45 degrees, 37 degrees, you can kind of pick and choose with that spring, because it allows it to still close in a static condition in the piping system.” Another consideration when installing check valves concerns the run of piping. Miller noted, “Ideally, you'd like to have a minimum of 10 pipe diameters of straight pipe o