BS&B A000561-1 Rupture Discs for Pressure Relief

BS&B A000561-1 Rupture Disc for Pressure Relief is a 4-inch reverse-buckling rupture disk (RLS) from BS&B Safety Systems, designed for sanitary service. The disk is rated to burst at 65 psig, providing a clearly defined relief point for process vessels and pipelines. Available in the sanitary RLS-S and RLS-ST configurations, it supports clean-in-place and hygienic processing environments found in pharmaceutical, food and beverage, and cosmetic manufacturing. As a non-reclosing safety device, the disk activates once the rated pressure is exceeded, providing rapid venting before requiring replacement after discharge. The A000561-1 designation identifies this specific disk profile within BS&B’s RLS family, ensuring compatibility with BS&B sanitary installations and standard 4-inch line sizes. Typical applications include protection of vessels and piping in chemical processing and other high-purity processes where maintaining product integrity and rapid relief are essential.