Bio-Rad BioLogic Signal Import Module (SIM) - Manual (Page 42)

2.6.2 AVR9-8 Stream Select Valve
The AVR9-8 stream select valve is an 9-port 8-position valve. This valve is optional for all DuoFlow systems.
The valve is rated at 3500 psi (233 bar) and is designed with non-metallic wetted parts for bio-compatibility
and minimal internal dead volumes.
• The AVR9-8 is ideal for stream selection, column switching, and large volume fraction collection.
• The AVR9-8 stream select valve uses a patented make-before-break design (MBB) that prevents
pressure spikes when the valve rotates from one port to another, eliminating baseline interferences,
and prevents pump shutdowns due to transient over pressure situations. This is especially beneficial
when using more fragile low pressure columns or flow sensitive detectors (e.g. refractive index).
• A valve rebuild kit is available.
Figure 2-13. AVR9-8 Stream Select Valve
The valve’s use dictates its plumbing. For example:
• When two AVR9-8 valves are used as a column switching valve, up to eight columns may be run
sequentially.
• An AVR9-8 expands the number of available buffers or solvents when used as an Inlet Valve.
• When used in conjunction with an auxiliary peristaltic pump (such as the Bio-Rad Model EP-1 Econo
pump or EGP Econo Gradient Pump) for loop filling and an AVR7-3 inject valve, the AVR9-8 valve
may be used to select up to eight samples for consecutive chromatography runs.
Auto Selection Valve
A
5
4
3
2
1
7
6
COMMON
DESCRIPTION OF BIOLOGIC DUOFLOW SYSTEM SYSTEM OVERVIEW
2-29