Rotary valves - sample collection, sample loop injection, selection
Rotary valves are available in various versions with very small internal volumes and carry over volumes.
Miniature rotary valve (low power) P200-O
Rotary valve High-speed P201-O
Valve head configurations rotary valves
|Wide range of valve head configurations with channels from 0.5mm for minimum internal volume and carry over volume |
Information about the rotary valves
The special positioning technology (encoder) with signal transmitters on the pump heads, enables channels with a diameter of 0.5 mm, internal volumes from 2.32 µl (from port connection to port connection) and carry over volumes from 0.55 µl (from port connection to port connection). Highly inert materials (PCTFE, PTFE) allow for their use with aggressive fluids. The miniature version of the rotary valve requires only a USB power supply. Due to its size, it is also suitable for mobile applications and microfluidics.
The valve models are suitable for the low pressure range up to 10 bar. They are available in different versions e.g. for the use in flow selection, flow distribution, sample collection and sample loop injection. The standard rotary valves are available with 1/4-28 UNF (flat-bottom) thread, communication can be realized via serial or I2C.
Advantages of the rotary valve technology
Fast media change with very little transmission volume
Low-diameter channels minimise the internal volume in the valve head and reduce the carry over volume between the port connections. This allows for a rapid switching between different media.
Very low internal volume
Channels with a diameter of only 0.5 mm allow a small internal volume of only 2.3 to 2.9 µl (from port connection to port connection) and a very small carry over volume.
Integrated position sensor (encoder)
Each rotary valve has an integrated position sensor (encoder), which allows for very precise positioning of the valve head. When starting the valve, an automatic position detection allows the detection of the current valve position - also called "homing".
Different motor configurations: miniature motor and fast rotating motor
The miniature low-power rotary valve version P200-O is operated using USB voltage and is specially designed for low power consumption and portable applications. This version is also used for the miniaturisation of applications and in microfluidics.
The high-speed rotary valve P201-O offers a solution that allows fast switching between the individual channels with a rotation speed of 400ms for a 180° rotation.
Valve head configurations
Valve head configurations are available in versions for sample collection, sample loop injection or channel selection. Customer specific solutions are also possible, please contact us. Here are some examples of valve head configurations. More information can be found in the valve head section.