Topic: electronic gas valve (Read 11621 times)

walrus · « **on:** August 12, 2007, 08:59:56 pm »

Just before they closed I purchased a Plover engine and all to go with it from Cheddar. This included and electronic gas valve control which has proved to be very usefull and very economical on gas.
I have now made a similar engine myself and have been looking around for a similar device but no one seems to make anything like it.
Does anybody out there know if one is available ?

HS93 (RIP) · « **Reply #1 on:** August 14, 2007, 04:53:34 am »

Anton

They do a mechanical unit. Cheddar did one a few years ago as well, before they went electronic Peter

http://translate.google.com/translate?hl=en&sl=fr&u=http://fabrice.bretagne.club.fr/&prev=/search%3Fq%3Dfabrice.bretagne.club.fr%26hl%3Den%26lr%3D%26sa%3DG

http://fabrice.bretagne.club.fr/Les%20Accessoires%20vapeur.htm#regul

Bunkerbarge · « **Reply #2 on:** August 14, 2007, 08:08:11 am »

John Hemmens also does a mechanical gas regulating valve. These work off a connection to the boiler which regulates the pressure on a diaphragm and is used to control the gas pressure to the burner.

They are not as reliable as the Cheddar EGV though so I would keep trying to get hold of one of them. I did see one on Ebay a while ago but it went for a good price so you may have to pay quite a bit for one.

I believe that one of the Cheddar family went off on thier own to continue production of the boilers so there may well be some possibilities there. I am sure that someone on here will know more details than I do.

HS93 (RIP) · « **Reply #3 on:** August 14, 2007, 12:54:29 pm »

This is the cheddar valve on the right of picture the red unit one pipe to the Boiler and the other two are gas in and out.

the company set up by EX cheddar staff that Bunkerbarge was talking about is http://www.cheddarvalleysteam.co.uk/

Peter

walrus · « **Reply #4 on:** August 14, 2007, 08:37:53 pm »

Thanks HS93 but Cheddar Valley steam cannot help. The unit I puchased from Cheddar is different to the one you show but I do not have a photo to hand.Will have to keep looking

Bernhard · « **Reply #5 on:** March 07, 2008, 12:51:39 pm »

http://www.stuartmodels.com/accessories.cfm/mainaccess_type/9/the_type/Electronic%20Gas%20Valve

Bunkerbarge · « **Reply #6 on:** March 07, 2008, 01:53:55 pm »

Quote from: Bernhard on March 07, 2008, 12:51:39 pm

http://www.stuartmodels.com/accessories.cfm/mainaccess_type/9/the_type/Electronic%20Gas%20Valve

Yes, and have you seen the price?!!!! Cheddar used to sell these for 80.00 pounds!

I was speaking with Nick Monahan yesterday in the United States who is currently developing his own version and hopes to have it ready in the not too distant future. I think it will be considerably more competetivly priced so I am waiting for his valve to become available.

eddieprice · « **Reply #7 on:** August 08, 2008, 08:44:10 am »

Just seen this thread about pressure regulators. I can guess how the ChedderSteam type works, but does anyone know how the StuartModels one works? From the photograph there appears to be an electronic pressure sensor, which presumably produces an electrical output signal, but how does that signal get to operate the brass control valve? Is there a servo to operate what appears to be a lever?

I am in the process of building a steam plant and would be interested in automatically controlling the gas burner.

Eddie Price

Proteus · « **Reply #8 on:** August 08, 2008, 08:48:00 am »

A servo operates a gas regulator and lowers the flame till the pressure drops and the heat goes back on. It was developed by Cheddar before they closed and as you say Stuart are now producing it.

Proteus

malcolmbeak · « **Reply #9 on:** August 08, 2008, 09:07:18 am »

I assume that if you are capable of making the engine, you would be able to make a mechanical valve. I have a design for one that has performed well for me over the years.
I can e-mail you the drawing if you are interested - it's in the form of a word file, and I don't know if these can be placed on this site.
Malcolm

Bunkerbarge · « **Reply #10 on:** August 08, 2008, 07:52:01 pm »

Just to clarify a little the Electronic Gas Valve produced by Stuart is the exact same unit that used to be produced by Cheddar. Stuart purchased the rights to accesories along with the Cheddar engine stuff but not the actual boilers.

The Electronic Gas Valve works by sensing temperature in the boiler, which is directly proportional to the the pressure in a sealed vessel such as this, and via a control box operates a regulating valve. This valve switches from a full flame position to a pilot flame position, depending on your own set point, via an adjustable potentiometer. Consequently when the presure falls the valve opens fully to full burner and when the pressure reaches the set point the valve switches down to the pilot setting and the pressure falls again.

There are also gas attenuator valves which work slightly differently. They are basically a diaphragm, operated by boiler pressure that controls the position of the diaphragm and therefore the position of the gas valve attached to it. The higher the pressure the more the valve closes. The boiler presure is balanced by a spring to enable the spring tension to be adjustable and hence control the set point.

eddieprice · « **Reply #11 on:** August 09, 2008, 07:55:42 am »

Thanks Proteus and Bunkerbridge for the explanation of the Stuart electronic control. I must admit I would not have thought of measuring the temperature. I think I will stick to the mechanical version with a diaphragm and needle valve.

I have made the gas valve and regulator to control the gas coming from the gas cylinder, which you described some years ago Malcolm, and were kind enough to send me details. That works fine. I was hoping to make something to regulate the flame, which is dependent on the pressure in the boiler. Do you have a design for this?, if so I would be pleased to have a look. You could e-mail me at eddiepriceATdirectsave.net

Eddie Price

Proteus · « **Reply #12 on:** August 09, 2008, 08:00:55 am »

I have a couple of each and the electronic control is far superior , you don't have to remember to back of the screw on the diaphragm after every use and it also acts a bit faster is also simple to set up. but thats just me, I have one of there ABC units which is the next stage , and one to far..

Proteus

oiler · « **Reply #13 on:** August 10, 2008, 08:04:05 am »

Quote from: Proteus on August 09, 2008, 08:00:55 am

I have a couple of each and the electronic control is far superior , you don't have to remember to back of the screw on the diaphragm after every use and it also acts a bit faster is also simple to set up. but thats just me, I have one of there ABC units which is the next stage , and one to far..

Proteus

I have an attenuator from Hemmens. didn't know we were supposed to back out the screw on it though. That would be a pain to do everytime.

Wish I could find the ABC unit but they are very hard to find it seems.

Coles here in the US also has an attenuator for anyone interested.

malcolmbeak · « **Reply #14 on:** August 10, 2008, 09:03:43 am »

Eddie
I've tried to e-mail you at the address you gave, but it doesn't recognise it. Why don't you e-mail me at malcolmbeak@hotmail.com
Malcolm

Bunkerbarge · « **Reply #15 on:** August 10, 2008, 09:41:09 am »

If you can just hold on for a bit longer Monahan Steam Models are in the process of developing an Electronic Gas valve along the same lines of the old Cheddar unit.

Send Nick an e-mail to see when this is likely to be.

Bernhard · « **Reply #16 on:** September 27, 2008, 08:53:34 am »

hey....... here is a link to one in Germany.

http://www.hielscher-dampfmodelle.de/cms/index.php?page=shop.product_details&flypage=shop.flypage&product_id=465&category_id=49&manufacturer_id=0&option=com_virtuemart&Itemid=38

regards Bernhard

Proteus · « **Reply #17 on:** September 27, 2008, 12:24:08 pm »

that just sets gas Pressure and does not do the same as a electronic gas valve as it does not controle the gas when the boiler reaches pressure

Proteus,

Bernhard · « **Reply #18 on:** September 27, 2008, 02:35:10 pm »

hi no thats true,,,,,bot i have 2 off them and some other kind to,,,and they just work perfect,,,cut of with 60-or 70 psi,,,even the gastank get hot,,,it is close to the burner,,
bot so there is this
http://www.dampfmodellbau-keifler.de/ Artikelnummer: 14-4000/S

Especially suitable for steam model boats
If required by small little steam ride is needed, the boiler pressure rises, so inevitably the pressure relief valve that Überduck abbläst. But the gas burner system RV 3 with RGD 3 is used, the effect of increasing pressure on the RGD 3 and thereby continuously reduced the gas flow through slowly to the set minimum value down. The flame will be smaller and produces less steam pressure.
If the machine again consumed drops of steam boilers and pressure from the control valve automatically opens the Gaszufuhrventil.
The vapor pressure should not drop below 2.2 bar and 3.0 bar not exceed, with the mean pressure at 2.6 bar.
This combined rule automatic saves gas and water, then extended the Duration and thus contributes to the optimum driving at. The use of such a valve is recommended for all types Brennero.

The compact body normally consists of two interconnected screwed valve blocks, the RV 3 and RGD 3 By the Gasreduzierventil RV 3, the pressure in the Gaskartusche which could. That means that once recruited for the gas burner is full, as well as almost equally empty cartridge. Under a scheme due to pressure in the Gaskartusche deleted. The print cartridges before the RV 3 can be up to 5 bars; a precise setting of the gas pressure of 0,1-1,2 bar with the upper adjuster infinitely possible. In addition, the housing is a second connecting thread for the reduced pressure. Published after the closure screw bolts can be a pressure gauge for testing or setting can be connected. Nor can this connection for a pilot flame of the burner used. Is a Gasreduzierventil exist in a gas cylinder may be based on the RV 3, where appropriate, be waived.

When ordering the fluent regulation you need to expect longer delivery times!

Bernhard · « **Reply #19 on:** September 27, 2008, 04:30:59 pm »

Quote from: Bernhard on September 27, 2008, 02:35:10 pm

hi no thats true,,,,,bot i have 2 off them and some other kind to,,,and they just work perfect,,,cut of with 60-or 70 psi,,,even the gastank get hot,,,it is close to the burner,,
bot so there is this
http://www.dampfmodellbau-keifler.de/ Artikelnummer: 14-4000/S

Especially suitable for steam model boats
If required by small little steam ride is needed, the boiler pressure rises, so inevitably the pressure relief valve that Überduck abbläst. But the gas burner system RV 3 with RGD 3 is used, the effect of increasing pressure on the RGD 3 and thereby continuously reduced the gas flow through slowly to the set minimum value down. The flame will be smaller and produces less steam pressure.
If the machine again consumed drops of steam boilers and pressure from the control valve automatically opens the Gaszufuhrventil.
The vapor pressure should not drop below 2.2 bar and 3.0 bar not exceed, with the mean pressure at 2.6 bar.
This combined rule automatic saves gas and water, then extended the Duration and thus contributes to the optimum driving at. The use of such a valve is recommended for all types Brennero.

The compact body normally consists of two interconnected screwed valve blocks, the RV 3 and RGD 3 By the Gasreduzierventil RV 3, the pressure in the Gaskartusche which could. That means that once recruited for the gas burner is full, as well as almost equally empty cartridge. Under a scheme due to pressure in the Gaskartusche deleted. The print cartridges before the RV 3 can be up to 5 bars; a precise setting of the gas pressure of 0,1-1,2 bar with the upper adjuster infinitely possible. In addition, the housing is a second connecting thread for the reduced pressure. Published after the closure screw bolts can be a pressure gauge for testing or setting can be connected. Nor can this connection for a pilot flame of the burner used. Is a Gasreduzierventil exist in a gas cylinder may be based on the RV 3, where appropriate, be waived.

When ordering the fluent regulation you need to expect longer delivery times!

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Author Topic: electronic gas valve (Read 11621 times)

walrus

walrus

Bernhard

eddieprice

Proteus

malcolmbeak

eddieprice

Proteus

malcolmbeak

Bernhard

Proteus

Bernhard

Bernhard