Mixing stick

[ScallopDiver]

I'm setting up my mixing stick and want to include a normally closed 120v solenoid for the oxygen flow that I will wire into the compressor cutoff circuit. Any suggestions for the best/cheapest/safest solenoid to use and a source? Thanks.

-brian

 

[Surface Tension]

Let me know if you find one. Another alternative would be to use some type of motor starter that wouldn't allow the motor to turn back on if you ever lost power.

That is really the main risk; a power loss, stick gets loaded with O2, then the power comes back on and caboom!

 

[ScallopDiver]

Here's a picture of one on a Rubber Ducky installation. Maybe one of those guys can help us.

http://www.rubberduckiedesigns.com/images/Jacks2.JPG

 

[Scuba Duck]

We have a couple products you may be interested in:

Rubber Duckie Designs Nitrox Controller, an Automated Control System for Blending Enriched Air Nitrox (EANx) for SCUBA

Rubber Duckie Designs Nitrox Safety Valve

 

[oxyhacker]

Since once the valve is closed the pressure inside the solenoid valve and line will gradually build to the set pressure of the reg, and then maybe higher if the seat is leaky as many old regs are. So the a solenoid cutoff valve if fitted really ought to be rated for 02 and rated for a fairly high pressure. These can be hard to find and often expensive.

One way around this is to use a three way solenoid, set so that rather than cutting off the flow when the power goes off, it dumps the flow into the atmosphere. This wastes a bit of oxygen, but mean the O2 pressure in the valve never exceeds atmospheric pressure, so almost any solenoid valve can be used.

A magnetic starter to prevent accidental restarts is a very good idea too. It really depends on how safe you want to be - and how much you trust your ability to monitor the process.

I'm setting up my mixing stick and want to include a normally closed 120v solenoid for the oxygen flow that I will wire into the compressor cutoff circuit. Any suggestions for the best/cheapest/safest solenoid to use and a source? Thanks.

-brian

 

[ScallopDiver]

Found a great source for an PVC static mixer on ebay:

Biodiesel 2" ID clear PVC static mixer, process mixer - eBay (item 170209657920 end time Apr-17-08 14:33:24 PDT)

They also have a 1 inch version.

 

[JBRES1]

The selonoid in the pic is an ASCO solenoid.
In Chicago there is a company call Affiliated Steam, and they sell ASCO.
Give them a call at 708-371-0600.

ASCO 's web site.
::Welcome to ASCO Valve- The World's Leading Manufacturer of Solenoid Valves ::


Jim Breslin

 

[Scuba Duck]

The valve in the picture is a porportional solenoid valve with a linear amplifier, costs about $800. Runs on 24 volts and requires a control signal. I'm quite certain that's not the valve you want, so I wouldn't use that as your example.

But I do sell just what you are looking for as a complete kit, available in either 110 or 220 volts...

Rubber Duckie Designs Nitrox Safety Valve

 

[Hoosier]

Derek,

Is there any tip or info that we can build a Nitrox Saftey Valve instead of paying $300 for the off the shelf product?

 

[Scuba Duck]

I had that soleniod valve custom built to spec, and I assemble the kits myself. You can buy it from me, and I can assure you that it will work (backed by a waranty). Or you can do the engineering yourself, try to figure out what you need, pay for a non-returnable item, and hope it works for you... Best of luck.