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Author Topic: Hand Dredge Check Valve Size and Orientation  (Read 4518 times)

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Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #20 on: September 06, 2018, 09:27:58 PM »
Been a long time since I rapped at ya...

Gym sock makes an ideal seal around the test plug assembly. The custom valves work great with hard foam seals keeping them in place.

Tests today show it performs great with the 8" nozzle - it would probably perform even better with a shorter nozzle and a better rock guard that wasn't embedded in the centre of the tube - all in good time.

Invested in a 2" MIPT -> hose barb adapter and it works great - going to invest in a relatively cheap shop vac hose to hook it up to a bucket and see how it does with some mid-stream boulders - some of which had collections of old axe heads and such around them.

Cheers




Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #21 on: October 06, 2018, 05:16:41 PM »
This is my last update.

Bought a 2.5" x 8' shopvac hose from Lee Valley tools and two hose adapters.

Works like a charm and the diameter of the hose and adapters means the lid no longer pops off the 5 gal. pail anymore.

Huzzah!

Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #22 on: October 26, 2018, 07:42:28 AM »
I lied. Sorry guys.

I am back in the lab working on a new valve design using ABS union fittings that should keep the same flow rate within a more compact and cost effective package.

We'll see how this goes.


[edit: the megasucker works fine - I just lied that the previous post would be my last...]

Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #23 on: November 04, 2018, 06:21:10 PM »
Finished the glue work and such for the version 2.0.

Tested it out with some makeshift valves in place - worked decent but has to be primed to work properly. This might not be a problem if I get the valve design right.

Looking forward to testing this out with gravel.

Some pics with inch ruler for scale:

IMG_1784.jpgIMG_1785.jpg

Offline mcbain

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #24 on: November 04, 2018, 07:19:14 PM »
Hi.You may have figured this out already but shop vac hose is pleated and acts like a sluice.any gold you find will be in thehose.i had the Royal gas powered vac and did not get gold until I flushed the intake hose.All your hoses should be smooth lined.Luck Mcbain.
I started out with nothing Istill have most of it.

Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #25 on: November 04, 2018, 07:57:55 PM »
Hi.You may have figured this out already but shop vac hose is pleated and acts like a sluice.any gold you find will be in thehose.i had the Royal gas powered vac and did not get gold until I flushed the intake hose.All your hoses should be smooth lined.Luck Mcbain.

Yeah... I have a source for smooth lined segmented hose, but I make sure to flush the lines thoroughly every time I use it...

Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #26 on: November 25, 2018, 11:32:32 AM »
So working on valve section version 2.0...

Two 2" ABS unions and a sanitary tee fitting. These are the latest versions of the valve flaps, which I just finished water testing before writing this post. They're made of approx. 3-4mm rubber sheet (read: a stair tread from Home Depot), some green twist-tie wire and some nut/bolt/washer hardware.

IMG_1804.jpg

Here are some other prototypes (about 9 were made in total). From left to right:
- the first one was a quick-n-dirty made from the same discount my-little-pony table mat material and electrical tape.
- the next pair were made from the same table mat as a backing, some yellow plastic from a binder and a floor slider. They failed catastrophically during gravel tests because the yellow binder material was too brittle
- the last pair were the prototype before the latest version of the  valve flap made from the same rubber, but they didn't have a much output flow as the latest pair and would constantly get sucked out under violent pressure from the outflow union because the circles were cut too small

IMG_1805.jpg

I'm looking forward to gravel testing these latest ones.

More updates coming up...

Offline mcbain

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #27 on: November 25, 2018, 06:26:40 PM »
Hi.DS I give you a lot of credit for Determination.but every time a 45 or 90 degree angle goesinto the system You have huge losses.Just saying.Luck,Mcbain.
I started out with nothing Istill have most of it.

Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #28 on: November 26, 2018, 07:18:43 AM »
I hear ya McBain. I tried to pare down the system to the least number of components this time around. The previous one had way more bends in it...

The sucker works at an angle to the ground of around 45 degrees or less, optimally. I've found that it's easier than a shovel and pick at least in terms of sucking up fine gravels especially when there's so much variability in the size of the rocks (from pea size and smaller to fist-size and up to basketball size all in the same cubic foot or so).


Offline DharmaSoldat

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Re: Hand Dredge Check Valve Size and Orientation
« Reply #29 on: December 01, 2018, 08:40:18 PM »
Small update. The new valves work great - except they get sucked out because there's not enough holding power between the pieces of the ABS union and the rubber of the valve flap - the outflow valve flap eventually gets sucked into the main body on enough upstrokes.

Possible solution? 1/8" shims cut off of 1.5" ABS couplings and some Shoe Goo to cement it all together.

The urethane is curing as we speak - stay tuned for the next exciting episode.


 


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