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Gas cutoff system

Posted by keepersg , 22 November 2020 · 1068 views

Gas cutoff system We've had repeated problem with pans being left on the burners in our kitchen and the house filling with smoke before anyone realizes what's happening.  In order to prevent this from happening again, I constructed a timed gas cutoff system that is mounted inside the cabinet on which the cooktop is mounted.  The gas piping routes the gas supply for the cooktop through an electrically controlled valve.  There is a manual bypass valve which is the yellow valve in the photo,  Initially, I tried a 120VAC solenoid valve but the hum from the valve proved unacceptable.  I substituted a low voltage ball valve powered by a spare doorbell transformer which is normally closed (it's a valve, not a circuit) and opens when powered.  When power is removed it returns automatically to closed.  Motion sensors in the the kitchen determine if anyone is present (through an Elk M1G) and programs on an ISY994i monitor this.  When motion is detected the valve is opened.  If there's no motion for 10 minutes, the valve closes.  In constructing the piping it is critical to pressure test the fittings to make certain there are no leaks.  A second test with soap solution after installation offers further assurance.  A gas detector in the kitchen will also turn the gas off as will a smoke detector in the adjacent dining room.




Very nice @keepersg.  

 

2 years ago here left a pot of water boil dry in a Teflon pot.   I did it trying to soften some plastic.

 

Typically Kitchen is off limits to me.

 

The effects of Teflon are typically death to a bird in the house which I did not know about.

 

This debacle sent my now 43 year old parrot to the bird hospital almost dead with lung damage. 

 

She was put in an oxygen tent for 3 days which saved her.   She is fine today.

 

No more Teflon in the house these days.  Purchased an Air Fryer a few weeks back and did notice it used Teflon such that I returned it and purchased a ceramic based Air Fryer.

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Pete, Glad she survived.  I had no idea birds were so sensitive to that kind of smoke.  Losing a long term, intelligent pet like that would have been tragic.

 

George

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I'm curious what brand/model valve you used.

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It's a U.S Solid 1/2 inch motorized brass ball valve 9-24 VAC/DC 2 wire auto return.  They're sold on Amazon for about $40.  It's a full port valve rated at 100,000 cycles

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I like the concept of you design.  But according a response I got from US Solid, those ball valves are not rated for use with natural gas or propane.   For safety's sake, get one that is rated for gas.

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I agree.  It's what I had lying around.  Starting from scratch I would find one that is gas rated and will get around to changing it.  Didn't specify the valve in the text for that reason but you asked...:).  I installed the gas detector in the kitchen to catch any possible failure in the system.  It's hardwired to the Elk M1G.

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BraveSirRobbin
Feb 24 2021 01:12 PM

What gas detector did you go with?

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I found these on ebay.  12 volt, has a test button.  I have one in the furnace room and one in the kitchen.  I also have a plug in model (Knight I think) in the kitchen.  It has the most annoying voice warnings possible.  My wife hates it.

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