Electric Rotary Valves

Accurate multi-port rotary valves for OEMs & high-tech analysis

Bio-Chem Electric Rotary Valves are compact, chemically inert rotary selection valves for sample selection, loop injection and multi-port switching. Thanks to a CTFE rotor and PTFE valve body, the ERV valves offer a fully metal-free fluid path, optimal chemical resistance and very low internal cavity volumes.

These valves are designed for OEMs that demand maximum reliability, reproducibility and compact integration in analytical instrumentation, medical equipment and industrial measuring and dosing systems.

How does an Electric Rotary Valve work?

An Electric Rotary Valve uses a stepper motor that accurately positions an internal CTFE rotor. Aligning the rotor and body openings creates a fully closed, inert flow path.

Operating principle:

1. The rotor turns to a fixed position via a NEMA 17 stepper motor.

2. An optical position sensor determines the exact home and port positions.

3. Rotor and stator openings align, creating the desired flow path.

4. A precisely machined press fit ensures a reliable seal without O-rings.

The result is a valve with high accuracy, minimal dead volume and full inertness for aggressive or sensitive media.

Key features & benefits

• Volledig inert fluid pad
  • CTFE rotor
  • PTFE body
  • No metal parts in contact with the medium: excellent for aggressive, reactive or high-purity liquids.

• Lage interne volumes
  • Optimised flow paths with minimal dead volumes for high flushing efficiency and low cross-contamination.

• Zeer nauwkeurige positionering
  • Stepper motor + opto-electronic sensor for consistent port selection, ideal for micro-dosing and instrumentation.

• Compact ontwerp
  • 4 to 12 ports in virtually the same footprint. Perfect for compact OEM modules.

• Diverse configuraties
  • Selection/distribution: one common → multiple ports
  • Switching/loop injection: pairs of adjacent ports
  • Orifice options: 0.032", 0.052", 0.096" (0.125" on request)

• OEM-gericht
  • 1/4"-28 UNF fluid ports with stainless steel inserts
  • Standard NEMA-17 motor options
  • Available as valve head only (RV-EN) or complete unit with motor (RV-SN)

Productseries & configuraties

RV-EN Series: valve head only

For OEMs who want to use their own motor or driver.
Available in:

• 4-way selection / switching
• 6-way selection / switching
• 8-way selection
• 10-way selection
• 12-way selection

RV-SN Series: valve with integrated motor

Fully assembled rotary valve including stepper motor and position sensor.
Easy to integrate into analysis and sample-handling platforms.

Typical applications

• Sample selection in analytische instrumenten
• Loop injection (e.g. autosamplers)
• Buffer and reagent switching
• Inline flow path routing
• Microfluidics & low-volume systems
• Clinical diagnostics
• High-throughput lab automation
• Water & environmental analysis