Since Rheodyne's founding in 1976, our development laboratories have consistently produced innovative fluid switching designs. Early attention focused on HPLC, which was then experiencing explosive growth in its infancy.

Sample Injectors
Rheodyne's first manual sample injector (1976) was the pioneering Model 7105. This injector has evolved through four generations to the current Model 7725, which is considered the industry standard with its pulseless switching architecture. Each new generation brought advances in performance and ease of use: elimination of pressure transients, zero sample loss, and simplified preventive maintenance.

Automated Platforms
Rheodyne's automated platforms also have a history of innovation. Our two-position motorized autosampler platform, the Model 7750, first introduced in 1995, is now in its third generation. Each generation demonstrated technological advancements — lower dispersion, longer lifetime, and smaller size.

In 1996, our family of automated multiposition platforms markedly broadened the array of flow path options available to instrument designers. This generation of electronically controlled valves now automate otherwise repetitive manual operations and dramatically increase productivity. Furthermore, recent design innovations provide valuable cost savings for OEMs where a single multiposition valve can perform what formerly required two or three valves. Moreover, with this innovative common platform approach, OEMs need only select or design the platform's liquid-end for such varied applications as column selection, column backflushing, column regeneration, fraction collection, LC–MS calibrant addition, and sample enrichment and clean up.

Miniaturization and Innovations in Fittings
In 1999, the firm introduced the world's smallest two-position injection and switching valve, the Model 7900MV. Concurrently, Rheodyne expanded its popular line of RheFlex® Fittings with a system of matched fitting and port threads for optimal connection performance.

ChromTRAC Color
Rheodyne also introduced color to visually identify and easily separate different fluid paths in complex, beast-like, multipath situations. Termed ChromTRAC™, these brightly colored knobs for RheFlex Fittings also established an industry-wide color-coding system for fluid connections.

TitanEX Low-Pressure Valves
In 2001, Rheodyne introduced the first of a growing family of low-pressure valves. Specifically designed for ultra-high duty (millions of actuations), TitanEX valves are designed for pressures up to 125 psi. This is in comparison to Rheodyne's high-pressure valves rated in the 5000-6000 psi range. TitanEX valves take advantage of state-of-the-art polymer material science and injection molding. To date, the TitanEX platform has passed 4.2 million actuations and retains its precision performance — a hallmark of Rheodyne quality.

MX Modules
In 2003, Rheodyne introduced its family of MX Modules. These are small, self-contained valves housed in an injected polymer case and take advantage of the small footprint of Rheodyne's "MV" valve architecture. MX Modules are available for both analytical and nano-scale operation and especially find wide use in the field of proteomics and nano-HPLC.