Mini High-Pressure Switching Valve

SIELC’s Advanced High-Pressure Mini Switching Valve for HPLC and Other Applications

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 .3 second switch time and can withstand up to 5000 psi (350 bar).

Key Characteristics

  • Flexible configuration
  • Mini size
  • Powered from USB cable
  • Serial commands via the  USB interface
  • Serial or TTL control 
  • Light position indication
  • Front LED doubles as a control button 
  • Small size
  • Low cost
  • Low energy consumption
  • Free PC based control software.
  • Direct control protocol for instrument integration

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

Available Configurations

5 connections
2 grooves
5 positions
5 connections
1 grooves
5 positions
7 connections
1 grooves
6 positions
6 connections
3 grooves
2 positions
6 connections
3 grooves
5 positions


  • Power requirements  USB type B
  • Mini Dimensions 6.0 cm x 4.5 cm x 12 cm   (2.5”w x 2.0”h x 4.5”d)
  • Weight  0.5 kg (1.1 lb)
  • Switching speed for 60 degree 0.2 sec
  • 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


  • Column Switching
  • Solvent Selector
  • Injection of Samples
  • Sample Cleaning