K_R values are used to determine the frictional flow loss in rupture discs. While the perception is that all rupture discs have high K_R values, this company's FAS (Forward Acting Scored; photo) and PRO+ (Precision Reverse Operating) discs debunk this perception by offering the best flow characteristics available in a rupture disc. Having a lower K_R value means that the FAS [K_(RG) = 0.223 (gas), K_(RL) = 0.19 (liquid)] and PRO+ (K_R = 0.29) rupture discs provide a larger opening that allows a greater flowrate than other rupture discs on the market, says the company. The ability of these two discs to reach such low K_R values allows for better flow and faster system relief in the event of overpressur-ization. The FAS and PRO+ are both used for safety-relief valve isolation. The FAS is used in high-pressure applications, while the PRO+ is ideal for situations requiring a lower burst pressure. The PRO+ is also suitable for isolation relief valves in high-cycling applications.
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