Cheap Gas Switch

robertfondren · 27th October 2007, 09:57

Does anyone see a problem with using a 3/16" barbed T-fitting as a manual gas switch? The idea (obviously) is to feed my SCR (Ray or homebuild) from two tanks, thereby giving me a surface/deco mix and a bottom mix, by running LP lines from each tank, and controlling which gas flows with the tank valves. It seems so cost-effective and simple, that SOMETHING must be wrong with it!

The actual flow rates will be controlled with a needle valve.

**Dave Sutton** · 27th October 2007, 14:23

Even easier: Run a line between the a LP port on each first stage... turn either one or the other cylinder on, and let the body of the first stages act as the "t". Make sure one goes OFF before the other goes ON and you'll be all set. This works for adding offboard diluent inlet to any sort of rig. If you drop a hose from a first stage to a QD fitting, you can plug on any cylinder, close off the supply valve to the "main" regulator, and then turn on the offboard one, and you are now feeding the rig with the offboard gas. Works a charm.

Don't make mistakes though....

Dave

27th October 2007, 09:57	#1 (permalink)
robertfondren New Member Current Rebreather/s: Ray Other Rebreather/s: Not Bought Yet Ray Join Date: Mar 2006 Location: u.s.a. Posts: 88	Cheap Gas Switch Does anyone see a problem with using a 3/16" barbed T-fitting as a manual gas switch? The idea (obviously) is to feed my SCR (Ray or homebuild) from two tanks, thereby giving me a surface/deco mix and a bottom mix, by running LP lines from each tank, and controlling which gas flows with the tank valves. It seems so cost-effective and simple, that SOMETHING must be wrong with it! The actual flow rates will be controlled with a needle valve.
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27th October 2007, 14:23	#2 (permalink)
Dave Sutton Diveshop of Horrors Current Rebreather/s: Sport Kiss MK 15.X rEvo Other CCR Azimuth Home Build Other Rebreather/s: Evolution Megalodon rEvo Other CCR Azimuth Home Build Join Date: Jun 2006 Location: Narragansett, Rhode Island and Hackettstown, New Jersey Posts: 2,907	Re: Cheap Gas Switch Even easier: Run a line between the a LP port on each first stage... turn either one or the other cylinder on, and let the body of the first stages act as the "t". Make sure one goes OFF before the other goes ON and you'll be all set. This works for adding offboard diluent inlet to any sort of rig. If you drop a hose from a first stage to a QD fitting, you can plug on any cylinder, close off the supply valve to the "main" regulator, and then turn on the offboard one, and you are now feeding the rig with the offboard gas. Works a charm. Don't make mistakes though.... Dave __________________ "Silent Diving with No Bubbles and No Politics".... www.nobubblediving.com Last edited by Dave Sutton : 27th October 2007 at 14:51.
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