Rheodyne Waters Switching Valve

Rheodyne EV700-100-WA Automated High-Pressure Switching Valve for Waters HPLC Systems

The Rheodyne / IDEX Health & Science EV700-100-WA Automated Switching Valve is a precision fluidic switching module custom-engineered for integration into Waters HPLC, UHPLC, and automated sample preparation instruments. Designed for high-pressure flow switching, column switching, fraction collection, and backflushing applications, this valve utilizes a motorized actuator assembly paired with an ultra-low carryover ceramic rotor and stator set. Engineered to operate continuously at pressures up to 5,000 psi (345 bar) or higher depending on configuration, the EV700-100-WA delivers high-speed position indexing and minimal internal swept volume to preserve sharp chromatographic peak shapes. Controlled via direct digital communication or electrical logic triggers from the Waters system mainframe, this valve ensures reproducible, leak-free switching over hundreds of thousands of actuation cycles.

Technical Performance & Structural Attributes

• Waters-Specific Interface Integration: Custom wiring, pin configurations, and mechanical mounting geometry allow seamless plug-and-play installation into Waters HPLC module compartments.
• Ultra-Low Swept Volume Flow Paths: Micro-machined fluidic channels and ports minimize dispersion, preserving column efficiency and mass spectrometry spray stability.
• Chemically Inert Ceramic & DuraLife Materials: High-purity ceramic stator and specialized rotor seal resist aggressive organic solvents, high-pH buffers, and abrasive salts.
• High-Torque Precision Automated Actuation: Integrated electronic drive actuator ensures fast, reliable valve position switching in less than 100 milliseconds.
• Zero-Dead-Volume Fluid Connections: Standard 10-32 threaded female ports accept micro-volume capillary tubing fittings for zero-dead-volume fluid transfers.

Product Specifications

• Model / Part Number: EV700-100-WA
• Primary Manufacturer: Rheodyne (IDEX Health & Science) / Waters Corporation
• Equipment Category: Automated High-Pressure HPLC Switching Valve
• Switching Architecture: 2-Position / 6-Port (or 10-Port depending on internal fluidic disk layout)
• Maximum Operating Pressure: 5,000 psi (345 bar) continuous duty
• Port Thread Size: Standard 10-32 UNF Coned Female Ports
• Wetted Materials: Ultra-High Molecular Weight Polymer / Ceramic / Stainless Steel
• Actuation Time: Less than 100 milliseconds position-to-position
• Instrument Compatibility: Waters Alliance 2695, 2795, and 2695D HPLC Systems
• Operating Temperature Range: 4 to 50 degrees C (39 to 122 degrees F)

Key Benefits & Applications

• Automated Dual-Column Switching: Enables automated selection between orthogonal analytical columns during multi-method sequence runs without manual plumbing changes.
• Online Sample Clean-up & Matrix Stripping: Facilitates backflushing and SPE pre-column heart-cutting to protect primary analytical columns from heavy sample matrix contamination.
• Routine Instrument Service & Automation: Replaces worn valve modules in Waters HPLC systems to restore precise fluidic flow paths and peak retention time reproducibility.

Used, tested to be in great condition.

All product names, logos, and brands are property of their respective owners. Rheodyne, IDEX Health & Science, and Waters are registered trademarks of IDEX Corporation and Waters Corporation.