Product Overview
The Rheodyne 7725i is a precision manual sample injector valve engineered for accurate, repeatable introduction of liquid samples into analytical and fluid-handling systems. Built around a robust rotary shear-valve design, the 7725i features a user-selectable internal or partial-loop configuration, allowing direct syringe injection into the sample loop without the need for additional fittings or adapters. With its chemically inert wetted path and low dead-volume flow passages, this injector valve delivers sharp, reproducible injections across a wide range of pressures and flow rates. It serves as a critical interface component in HPLC, LC-MS, and general process fluid sampling circuits, where precise volumetric metering and leak-free sealing are essential to system accuracy and uptime.
Technical Specifications
| Parameter | Specification / Feature |
|---|---|
| Component Type | Hydraulic Valve — Manual Sample Injector Valve (Rotary Shear Valve) |
| Model Designation | Rheodyne 7725i |
| Operating Pressure | Standard Industrial Grade (Up to 5,000 psi / 345 bar typical for analytical service) |
| Mounting & Connection | Standard 1/4-28 threaded ports; panel-mount body configuration |
| Valve Configuration | 6-port, 2-position rotary shear valve with internal or partial sample loop |
| Actuation | Manual lever / knob actuation with defined LOAD and INJECT positions |
| Wetted Materials | Chemically inert PTFE-filled rotor seal and PEEK or stainless steel body components |
| Sample Loop Volume | User-selectable (commonly 5 µL to 5 mL depending on loop installed) |
Engineering Features & Advantages
- Precision Metering: The rotary shear-valve mechanism provides highly repeatable sample injection volumes with minimal carryover and low dead volume, ensuring analytical accuracy in critical fluid circuits.
- Sealed Spool Interface: The PTFE-filled rotor seal maintains a leak-free seal against the valve stator across thousands of actuation cycles, even at elevated system pressures.
- Industrial Reliability: Built for continuous operation under demanding laboratory and process conditions, with a mechanically robust body designed to withstand repeated LOAD/INJECT cycling.
- Direct Fit Replacement: Exact dimensional and functional compatibility with original Rheodyne 7725i specifications, allowing drop-in replacement without modification to existing plumbing or panel cutouts.
- Versatile Loop Configuration: Supports both internal and partial-loop injection modes, giving operators flexibility in sample volume selection and method development.
Typical Industrial Applications
The Rheodyne 7725i manual sample injector valve is widely deployed in HPLC and LC-MS analytical systems, pharmaceutical quality-control laboratories, chemical process sampling and monitoring skids, and general fluid-handling circuits requiring precise,
PRODUCT IMAGES
Rheodyne 7725i Manual Sample Injector Valve
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- Peace of Mind: Covered by our 12-Month Replacement Warranty.
Shop the genuine RHEODYNE 7725i Manual Injector Valve. This US-made analytical valve features a 6-port rotary design, delivering leak-free, reliable fluid control for heavy-duty industrial systems.