Bio-rad laboratories offers biologic duoflow valves. The sv5-4valveisa 5-port, 4-waylow-pressure valve for selecting from up to 4 buffers or solutions and auto sample loading from up to 4 samples directly on to a column or into an injection loop. The svt3-2 valve is a 3-port, 2-way low-pressure valve for selecting from 2 buffers or solutions; loading from 2 samples directly on to a column or into an injection loop and diverting buffer flow. The avr7-3 sample inject valve is a 7-port, 3-way high-pressure valve for loading samples into a static loop or a dynaloop dynamic loop for injection on to a column; reverse-flow applications and switching between 2.Columns. The avr9-8 select valve is a 9-port, 8-way high pressure valve for selecting from up to 8 buffers or solutions; auto sample loading from up to 8 samples directly on to a column or into an injection loop; switching among 8 columns; and collection of large-volume fractions. A total of 6 valves [3 low-pressure and 3 high-pressure] may be used at one time, allowing one to run more complex methods. Additionally, by adding a biologic maximizer valve system, the number of valves is doubled to 12 [6 low-pressure and 6 high-pressure].
