Alltesta™ High-Pressure Switching Valve

SIELC’s Alltesta™ High-Pressure Switching Valve for HPLC and Other Applications

Alltesta™ High-Pressure Switching Valve (front)
Alltesta™ High-Pressure Switching Valve (back)

This high-pressure mini switching valve is designed for chromatographic and general laboratory fluid management applications. The valve is engineered for flexible flow switching at different flow rates.

It can be used for OEM applications or as a stand-alone device for different flow-switching applications.
The mini switching valve provides an alternative to manual injection in a high-pressure stream or switching of low and high-pressure flows for chromatography and other similar applications. It offers several available rotor and stator configurations
. In addition, it provides a very simple setup with a USB interface for power and communication.

This compact high-pressure mini switching valve eliminates the need for an autosampler by utilizing a fixed-volume injection loop and a manual syringe for sample introduction. The number of connections, grooves, and positions can be customized for various needs. This mini switching valve has plenty of custom options so users can find the one that suits their needs.

This mini switching valve sports a 300 millisecond switch time and can withstand up to 5000 psi (350 bar).


  • Power requirements  USB type B
  • Dimensions (WHL): 63 x 46 x 128 mm / 2.48 x 1.81 x 5.04 in
  • Weight: 0.45 kg / 0.95 lb
  • Switching speed for 60 degree 200 ms
  • Max pressure 350 bar (5000 psi)
  • Ports style 10-32 thread with conical 1/16″ tube compression type seal
  • Materials in contact with liquid coated SS316, Vespel® or PEEK or PTFE

Available Configurations

7 connections, 1 groove, 6 positions
6 connections, 3 grooves, 2 positions

Key Characteristics

  • Flexible configuration
  • Small footprint
  • Affordable pricing
  • USB-powered
  • 3 different control options via the USB interface
  • LED position indicator that doubles as a control button
  • Low energy consumption
  • Free PC-based control software
  • Direct control protocol for instrument integration


The Alltesta™ High-Pressure Switching Valve can be controlled remotely through the cloud, directly via our custom OEM software, or automatically via Serial commands. Connection to through our cloud software is made through the Alltesta™ Power Tower. Every purchase of the Alltesta™ Power Tower includes a free subscription to

Please also see below for links to our OEM software and drivers for Serial commands.


Windows 10, 32/64bit, 5.34 Mb (usb2serial FTDI FT230XQ-R driver included)

Windows 7, 32/64bit, 120.9Mb (usb2serial FTDI FT230XQ-R driver included, please restart your PC after installation)

Serial Communication Drivers:


For the list of serial commands, please contact us at

Available Custom Options

  • This mini switching valve is available as an OEM unit without the standard enclosure and with different mounting options
  • A High-flow version of the valve (preparative) is available which can allow flow rates up to 10 ml/min and a max pressure up to 2000 psi
  • A metal-free version of the valve is also available.
  • This mini device utilizes the RS232 (via USB) communication protocol for operation.
  • Simple PC-based software for valve operation is available.

Valve Rotor Position Indication

LED color indicates the valve’s rotor position. By pressing the LED, the rotor can be advanced by one position. Depending on the valve configuration, the second press will either advance the rotor forward or backward.

Position 1 – LED Green
Position 2 – LED Navy
Position 3 – LED Purple
Position 4 – LED Blue
Position 5 – LED Red
Position 6 – LED White


  • Column Switching
  • Solvent Selection
  • Sample Injection
  • Sample Cleaning