Bio-Rad ChromLab™ Software - Manual (Page 38)

2 | The NGC Instrument
36 | NGC Chromatography Systems and ChromLab Software
Valves
All NGC systems include a sample inject valve. Your system might also include one
or more of the following valves:
 Buffer blending valve
 Buffer inlet valve
 Sample inlet valve
 Outlet valve
 Column switching valve
All valves (except the buffer blending valve) are motorized rotary valves with a
number of defined inlet and outlet ports. As the rotary valve turns, the flow path for
the valve changes. The active ports are identified by LEDs. Green LEDs indicate that
the flow through the port is from the system pumps. Blue LEDs indicate that the
flow is from the sample pump. The pattern and location of the ports determine the
flow path and function of each type of valve.