Swagelok”s SSV series stream selector system delivers a representative sample from multiple sample streams to a single analyzer. These modular assemblies are ANSI/ISA 76.00.02 compatible and are designed to accommodate multiple process streams in a limited amount of space. Each stream is controlled by a double-block and bleed (DBB) module to eliminate cross contamination and maintain sample integrity. Based on a modular technology concept, these valves house double-block, bleed, and actuation functions within a single, compact module to reduce the total space needed to perform sample stream selection and overall installation time. As system requirements change, modules can be added or removed. The SSV series stream selector system features an integrated flow loop to streamline sampling and purging and provide consistent outlet flow. Regardless of which stream is selected, the flowrates of all streams remain consistent.