Originally Posted by Jake
Mike,

Nice setup on the vacuum. Note, however that the pump will not hold the vacuum on it's own if you turn it off - it will bleed back through the vanes and discharge your reservoir.. a check valve at the discharge of the pump, or better yet, a electric 3-way mac valve will seal off the vacuum pump when it's off.



In the medical field we use a "water seal system" for chest tubes. It creates a negative pressure system for reinflating the lungs after puncture or surgery(The lung cavity has a negative pressure which keeps the lungs inflated as opposed to the notion that air inflates them positively), but anyway once suction is applied to the water seal system, it cannot bleed back thru the water to lose the pressure. I suppose a check valve does the same, but the bong with a water filled chamber between the pump and the seal may suffice for cheap.

I had the same question about bleed back of extra resin into the bong...does it collect there and harden, or is there a relief for the resin to pour out?

Thanks for all the info, keep it coming

Last edited by dave mosley; 08/13/09 10:40 AM.
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