Shurflo Recirculating bypass

[alldaysit]

Could someone provide information on what they mean when they say they have a recirculating bypass to help with vacuum? Thanks from a newbie!


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[Waynehere]

You run a line from your puddle in the tank to the inlet of your pump to have a steady stream of sap and keep the diaphragm wet. It will produce a lot more vacuum. Usually you will put some kind of valve to restrict the flow as you don't need a full stream, just enough to keep it wet. I use a star fitting at the inlet of my pumps.

[Ivyacres]

For newbies a picture or ten is worth a thousand words.
Thanks!!

[alldaysit]

So basically, I could just add in a line from the tank to the mainline just in front of the pump? And I should restrict that down to just a small amount?

Does the pump then run continuously?

[Waynehere]

That sounds right. And yes, the pump will run continually circulating the sap from the tank and really pulling harder on your main. I just use 5/16" for everything and as long as you don't have any leaks, you should get a steady pull in your lines. The idea is to turn down the recirc line to get more vacuum in the main. You will need to play with it and see.

[n8hutch]

I think this is an interesting idea, there is a guy near me running the G2 Double Guzzlers on a 3/16 hybrid system. And he has a way that he primes the pumps to get them pulling harder, last time I was there he was pulling 26.5-27 Inches steady.I Was impressed, now I'm thinking about putting a Saddle just ahead of my pump with a 5/16 line and a small valve .Great Idea.

[blurr95]

I started just using a 1/2" plastic valve to try to recirculate, there was no control over it really. Even having it cracked open as small as I could get it was still letting to much through. I then ran 1/4" tubing through a 1/4" brass needle valve, what a difference. I have really fine control with the needle valve, and even with it wide open, it still doesn't have a lot of sap recirculating, but enough to make it draw good.

Jason

[alldaysit]

I started just using a 1/2" plastic valve to try to recirculate, there was no control over it really. Even having it cracked open as small as I could get it was still letting to much through. I then ran 1/4" tubing through a 1/4" brass needle valve, what a difference. I have really fine control with the needle valve, and even with it wide open, it still doesn't have a lot of sap recirculating, but enough to make it draw good.

Jason

Awesome!


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[alldaysit]

I started just using a 1/2" plastic valve to try to recirculate, there was no control over it really. Even having it cracked open as small as I could get it was still letting to much through. I then ran 1/4" tubing through a 1/4" brass needle valve, what a difference. I have really fine control with the needle valve, and even with it wide open, it still doesn't have a lot of sap recirculating, but enough to make it draw good.

Jason

What type of fitting do you get to fit that 1/4" line to your main?


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[BAP]

I used a tee in my mainline before the pump then a stub piece of mainline, then used a barb to pipe thread fitting. I then used a pvc threaded shut off valve and bushed the other side of the valve to accept a 1/4" needle valve hitched to a piece of line that I put in the low end of the tank to suck sap out. I find that as the vacuum level rises, that I have to add more recirculating sap to keep the pump sucking sap or it will stop pumping against the high vacuum if it doesn't have a steady stream of sap running threw the pump. I get 21-22" of vacuum.