The Hoke 3700 Series selector valves are instrumentation valves designed to direct, isolate, or switch process flow paths in analytical and sampling systems. These compact rotary plug valves feature a durable packed stem design with smooth low-torque operation and reliable sealing performance. The series is available in multiple flow patterns and port configurations, allowing flexible system integration for stream selection, calibration switching, and analyzer routing applications. Constructed primarily from 316 stainless steel with PTFE seals, the valves provide excellent chemical compatibility and dependable operation in corrosive environments. Operating pressures are typically rated up to 3000 psig (207 bar) depending on configuration. Typical applications include gas chromatography, sample conditioning systems, process analyzers, calibration manifolds, and laboratory instrumentation requiring reliable flow switching.