Quote:
Originally Posted by funola
Here's my test setup. An old plastic vacuum line connecting the 2 vac pumps.
The wire clamped to the pump is a gauge to indicate if the cam follower moved or not. 22" Hg was insufficient to move it.
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The Green Arrow shows direction of the Vacuum Flow. Pulling vacuum on that side will close the Check Valve where the Red Arrow is. That will prevent Vacuum from entering the that Vacuum Pump.
Even after you get past the Check Vlave there is other Valves inside of the Pump that are one way valves like the check Valve.
In fact if you use the Mighty Vac to create the Vacuum it will close both the Check Valve on both Vacuum Pumps.