FINALLY AN UPDATE
FINALLY AN UPDATE
I have all of the parts set up and working for my flow switching device. I really had my mind set on doing some type of flow switching to make the tank more dynamic, and because I like gadgets! I looked at a lot of different options for flow switching, including:
OceanMotions 4-way
OceanMotions SuperSquirt
SCWD
Sinusoidally Varying Valve (cylindrical)
Motorized Ball Valve
Actuated Jandy Valve (typically used for swimming pools)
One of the driving factors in deciding what to use was that I want to run penductors on this system, and they create approx. 10 psi (~23') of backpressure. I want to use penductors since I want to get maximum flow from my sump return but don't want to pull 2000+ gph through the sump (too noisy, etc.). So I figured a sump return is a good place to use penductors. I can run it at around 1000 gph and get much more effective flow than that inside the tank. They claim that for every one gallon pumped through the penductor you can get five gallons of tank water moving through the penductor, under ideal conditions (7.5 gpm at 10 psi) I will be happy if I'm getting 2X to 3X flow. Assuming 3X actual flow, I'll get 3000 gph from my sump return and another 2800+ gph from my closed loop. That should be enough flow I think.
So what I decided to use...
- The OM devices are not really set up for back pressure created by the penductors. From what I've read here and on their forums, using their products with penductors or eductors has been problematic.
- SCWD was ruled out for the same reason as the OM devices.
- I couldn't deal with the sinusoidally varying valve project. I don't feel like I have access to the equipment to attempt that project, and don't have the time either.
- I liked the actuated ball valve idea . . . until I found out how much they cost. As far as I could tell, I'd be looking at over $300 for a 1.5" setup, not including the timer.
- The Jandy valve looked like a good option to me. I have one on my pool, and it runs under more pressure and flow than I'll need on the reef tank. They are very simple to take apart to clean, lube, etc. and the price is right.
All of the parts for my Jandy valve setup were bought on ebay, all new items, and for much less than typical retail.
I paid
$36 shipped for the Omron H3CA-A digital timer
$30 for the 1.5" Jandy neverlube valve (which I promptly lubed)
$90 for the Jandy 2440 valve actuator
$10 for the 24VAC 1500mA power supply (from a local surplus store)
I have it all wired up and it works great. There are a few other people I've heard of using this type of system, so I'm confident it is going to work well. It is not really made to run at the duty cycle that I'm going to run it at but if I lube the valve seals every few months I think it will be fine. And the neverlube valve has a lifetime guarantee.
Some pictures:
I have the tank in the house finally, although it is still far from ready for water...
And this morning I'm going out to pick up the correct union ball valves (I had bought the wrong type last time, they can't actually be taken apart while under pressure - wierd). Once I have them I can start the sump/fuge plumbing. But I probably can't go too far with that until my pumps get here, have to make sure everything fits under there. I have a feeling it's going to be a little tight. It will be like fitting a puzzle together...
If I had done a little more looking around, I would have realized I needed the stand to be at least 6" higher. Although it works well from an aesthetic point of view since it is about level with the back of that sofa, it would be great to have 6" more vertical space under there for plumbing... But I am not up for modifying the stand, so I'll make it work as is.