Automated sampling of non-pressurized containers

SD configuration – low pressure

SD valves select one of 4 to 16 dead-ended streams. The selected stream flows from the valve outlet to a sample valve, pressure sensor, detector, column, etc. The same configuration may also be used to direct one stream to a number of outlets for applications such as fraction collection.

This example illustrates automated sampling of non-pressurized containers.

Move your mouse cursor over a Step to "switch" the valves, or go to a non-animated version.

Step 1: A vacuum pump moves sample from the containers to a 6 port sampling valve.

Step 2: The 3 port valve blocks the vacuum flow through the sampling valve to allow the sample within the loop to equilibrate at atmospheric pressure.

Step 3: The 6 port valve is switched, injecting the sample.

This method eliminates any possible effect from pressure differences among the containers, providing accurate and repeatable results. All three valves can be automated with air or electric actuators for unattended operation.

Further reference

More applications with multiposition valves
Valco multiposition valves – SD configuration (low pressure)