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Gas demand valves

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martin perman05/11/2018 20:52:06
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1522 forum posts
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Gentlemen,

As mentioned before I collect and restore Lister Stationary Engines and at the weekend at a bring and buy sale I found a gas carburettor for one of my engines.

I need a demand valve, I spent last night looking on the internet with no joy so does anybody have any suggestions please.

Martin P

Arthur Sixsmith05/11/2018 21:07:48
14 forum posts

Hi Martin same hear.I have been looking for one for ages. I tried a engineer that repairs fork lift trucks.No joy. Some where on net some one was using a gas reg in reverse but now lost the site.I will be very interested if you find one that is not to expensive! Arthur

Brian Sweeting05/11/2018 22:23:07
341 forum posts
1 photos

Found this set of plans and parts from America, any use?

**LINK**

Brian Sweeting05/11/2018 22:56:46
341 forum posts
1 photos

Second thoughts - plan to build your own here....

**LINK**

Tecumseh needle valve and diaphragm are still available via Google search.

Edited By Brian Sweeting on 05/11/2018 23:02:08

JasonB06/11/2018 07:08:37
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Engineers Emporium do castings for a No1 National Gas one that comes out 160mm diameter, it is not on their website but e-mail or phone for details, costs about £75

gasbag.jpg

Or Buy a Garretson KN off e-bay or Amazon which will do the job and be plug and play and probably cheaper.

 

Edited By JasonB on 06/11/2018 07:44:25

martin perman06/11/2018 08:15:32
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thanks all,

Making one is an option but I've been looking for a Garretson KN as that is whats generally used but they seem thin on the ground.

Martin P

Ian S C06/11/2018 11:09:18
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Most of these old motors when operated on gas were using coal gas, LPG can be a bit tricky to get going. There have been designs for demand valves for model motors on some of the forums, think there is one on MEM, and the"other" forum.

Ian S C

martin perman06/11/2018 16:57:27
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1522 forum posts
64 photos
Posted by Ian S C on 06/11/2018 11:09:18:

Most of these old motors when operated on gas were using coal gas, LPG can be a bit tricky to get going. There have been designs for demand valves for model motors on some of the forums, think there is one on MEM, and the"other" forum.

Ian S C

My Gas Carburettor was designed to work on propane in the 1950's by Calor, I've emailed Engineering Emporium this morning for details, no response yet.

What is meant by the other forum.

Martin P

Edited By martin perman on 06/11/2018 16:58:07

Edited By martin perman on 06/11/2018 17:00:54

martin perman07/11/2018 11:46:20
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Heard from Engineers emporium this this morning, £127 for two castings is a bit steep I'd rather put it towards a new Garretson.

Martin P

martin perman07/11/2018 14:35:01
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1522 forum posts
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Gentlemen,

I bit of luck this lunch time, a friend of mine, who lives in Uxbridge, sent me, via a courier, a demand valve approx six inches diameter made by a company called LP-GAS EQUIPMENT LTD, Birmingham. it needs a new diaphragm so I've done a quick search for 0.2 mm rubber sheet and have found some with a company that says its Latex and good for diaphragms, does anybody have experience of making these and their material use.

Thanks,

Martin P

JasonB07/11/2018 14:54:29
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Ouch that has gone up a bit and my printed list was only printed earlier this year

Neil Wyatt07/11/2018 15:29:43
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As an aside, I've reconditioned three Koltek LPG vaporisers for Vauxhall factory fit systems. It was a fairly straightforward process and quite interesting, it's a two stage regulator heated by radiator water, so liquid in, gas out. It suffers two issues over time - the rubber diaphragms get saggy and the valves gum up. I thought it would be interesting to make a small version, but I doubt you could miniaturise it by more than about 1/4 scale.

Neil

Ian S C08/11/2018 12:09:46
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7262 forum posts
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The "other" forum is the "Home Model Engine Machinist" HMEM.

Ian S C

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