[DonRotolo]

In testing we have found that stopping the air pressure flow to the venturi device causes the vacuum that was generated to release in well under 1/10 second.

Note that we do not have much in the way of volume (cubic inches) of space that is under vacuum - just a few inches of hose and the suction cup itself (the volume between the cup and the tube being held).

If your robot configuration is really different from that, let us have some details. Basically, you release vacuum just like you release pressure - vent to atmosphere.

Don