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The MRC aspirator valve from My Reef Creations is a finely crafted air and water mixing device. This aspirator valve is designed to suck in air for large needle wheel protein skimmer pumps. Unlike the more typical venturi valves which are designed for positive pressure and halfhazardly slapped onto needle wheel applications, a well designed aspirator valve will have that inner sleeve which extends close to the pump intake and uses negative pressure to draw in air. As we’ve come to expect from MRC’s CNC prowess, the MRC aspirator valve is machined from schedule 80 pipe a solid billet of PVC rod and it includes a threaded johnny guest fitting for quick disconnect and maintenance of the air inlet. The MRC aspirator valve pictured above is designed for the new Orca Pro I and Orca Pro II skimmers which are powered by Reeflo needle wheel pumps. The Orca Pro III will use a similar aspirator valve but with a larger overall diameter. For now the MRC aspirator will not be available separately but if enough people bug them about getting some for upgrades or DIY, they might be convinced to sell the MRC aspirator as a separate accessory. The air sucking MRC aspirator valve should be shipping with all new Orca skimmers, more detailed pictures after the break.
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can someone explain negative vs positive pressure venturi concepts to me. i get the positive/negative part, i am more concerned with the details on how it works and how it is created with this “inner cylinder” . thank you!
There is no such thing as negative pressure. Thats for starters. You can only have a pressure that is lower in relation to another, but pressure can not go below 0 (vacuum of space).
I wonder… do these venturis have vena contractas that are removable or swappable? The ideal venturi diameter depends not only on the pump, but the back pressure that the skimmer puts on the pump… as in, the height of water in the skimmer. A venturi for a skimmer that is 4′ tall should be different than one for a skimmer that is 2′ tall.
The MRC aspirator is is machined from a solid, single piece so no part is removable except the Johnny Guest fitting.