part 2 in the series of equipment hacks...
a simple vacuum valve setup.
the bits of brass pipe and connectors, vavles and nipples can be found in most hardware stores. they conform to NPT and other standards, so they're very useful.
the gauge is connected to a valve. the gauge shouldn't be left open all the time, as it will probably reduce the vacuum a bit, and could get contaminated with any solvent vapour in the system. the valve's are high pressure, and can be used to regulater the vacuum flow.
underneath the table is a brass nipple/hose connector with a 3/8" high pressure hose leading to another connector on the pump. this allows the pump to be moved around as needed, and generally kept out of the way. the pump is plugged into a socket that is controlled by a light switch. very civilized.
NOTE: the hose underneath leading to the pump SHOULD lead to a vacuum controller and then vacuum trap, but SWIM doesn't have ready access to DRY ICE or own a controller (yet).
possible improvements:
- inline digital manometer in place of the gauge
- proper bleed valve to reduce vacuum