HPLC Injection and Switching Valves

 
Due to their compact dimensions, KNAUER valves need very little bench space. Valves are ubiquitous in all HPLC applications. 2-position valves are used mostly for injections, but can be used for complex switching systems as well. Multi-position valves are used for fraction collection, eluent selection or column switching. Based on decades of know-how and our latest research, the new AZURA V 4.1 valve range with associated actuator represent the most powerful valve generation in KNAUER's history. Technological progress can be seen, for example, in the new high-pressure valves.
 
A special DLC coating (diamond-like carbon) offers a significantly lower coefficient of friction and enables a long service life and chemical resistance. Ultra-fine bores ensure a low dead volume. In combination with the rotor seal made of a pressure-resistant polyimide, these new valves are suitable for pressures up to 1200 bar(~17,400 psi).
 
With the range of valves offered by KNAUER, numerous switching tasks in 1/16 or 1/8 inch versions are available, also for biocompatible applications. Since KNAUER controls the entire production chain from development to production, valves can also be produced to customer specifications.
 
Please note that the 2.1 valve series is currently being replaced by the 4.1 series of valves. This process is expected to be completed by the middle of 2020.
 
Electrically Driven Valves
 
The valve drive AZURA® Valve Unifier VU 4.1 enables automatic valve switching. Due to its low switching time, the flow path is blocked only for a very short time, and pressure peaks are reduced to a minimum. Valves are identified via RFID technology, which guarantees an easy valve exchange of KNAUER valves with RFID technology. This RFID technology allows easy checking of GLP data and simplifies maintenance, e.g. exchange of a rotor seal.
 
Each valve head is equipped with an RFID tag that stores all relevant data. This data is read by the VU 4.1 valve drive via wireless and switching parameters are automatically adjusted. For example, a 1/8 inch valve with 2 mm bores, due to its size, requires a higher torque than a 1/16 inch valve with 0.3 mm bores.
 
The display enables user-friendly standalone operation. In addition, the valve drive can be operated with software as well with an optional touch display (Mobile Control) via LAN or analog input/output thus allowing integration into nearly every LC system. Depending on your requirements you can chose between 2-position or multi-position valves:
 
2-position valves are used mostly for injections, but can be used for complex switching systems as well. All ports are located in peripheral positions. The channels always connect two of these ports.
 
Multiposition valves are used for fraction collection, eluent selection or column switching. They have an extra port in a central position and one channel which connects the central port to one of the peripheric ports.
 
If more than one valve is needed for your application, it might be helpful to combine these as units into a single stackable AZURA ASM 2.2L module.
 
Key features:
 

• Available in various materials
• 1/16" or 1/8" versions available
• Electrical versions for automated systems
• One drive for all valves
• Ultra fast switching cycle
• Various control possibilities
• Multi-position valves for easy fraction collection
• Range of rotor seal materials for wide application range