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Electric Rotary Valves
Our Electric Rotary Valve (ERV) is a stepper motor driven fluid handling valve. It provides an inert flow path for aggressive fluids. The inert path is achieved by aligning holes in a PCTFE rotor with holes in the PTFE body. ERVs are typically used in one of two main applications; port selection applications where one stream is diverted to one of multiple paths, and loop injection applications where the valve can be used to load and inject fluids into a sample loop in two discrete steps.
Standard Product Configurations
The following table shows the available technical aspects of our standard Electric Rotary Valves. The ERV can be supplied with or without the stepper motor.
Customization available upon request.
|Orifice Size (in.)
Head Diameter (in.)
|Angular Move Distance||degrees||90||60||45||36||30|
|Suggested Motor Speed||RPM||60||40||40||40||40|
|Port-to-Port Move Time||msec||250||250||180||150||125|
Port Selection Mode
Our ERVs allow for accurate and repeatable flow re-direction. One input can be diverted to any one of up to 12 outlets, or vice versa.
Loop Injection Mode
Our ERV can be used as 4 port and 6 port switching valves for sample injection devices in chromatography systems. This application is comprised of two distinct operations: Load and Inject.
Step 1 – the sample can be loaded into the sample loop while the mobile phase is pumped directly through to the column.
Step 2 – When the valve switches to the inject position, the pump connects to the sample loop and the sample is carried onto and through the column. The “sample in” and “waste” ports are joined but are isolated from the loop.
- Inert fluid path – the fluid in the Electric Rotary Valve contacts only two components; the PTFE valve body and the PCTFE rotor. This ensures a completely non-metallic, corrosion-resistant path.
- Multiple flow configurations – the ERV is available in eight different flow configurations with three different orifice sizes, 0.032″, 0.052″ and 0.096″.
- Unobstructed flow path – precise machining creates an unobstructed flow path through the Electric Rotary Valve minimizing dead volumes and providing a lower pressure drop than solenoid mixing valves
- OEM focused – the Electric Rotary Valve is available with and without the NEMA 17 stepper motor and controller board.