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[Bernhard]

hello...........
i neat a littel help.........what size is the proteus boiler safty valve,,,it is not 5/16--32 it can only be turn 1.or to turns,,,i neat to have a probe in there ,,
many thanks

Bernhard

[MONAHAN STEAM MODELS]

I am almost 100% sure that Cheddar used 5/16"-27 threads for their safety valves.

Regards,

Nick

[Bernhard]

Hey Nick........Thanks,,,,,,,so i will ordre that size.......here in Denmark......wi only use MM.........

Bernhard

[AlexC]

 

Almost right Nick......... Chedder use 5/16" x 26tpi constant pitch for their safety valves.

Keep happy.

Alex C (sandy)

[Bernhard]

ohhh ..Thanks  nick ..so ..it be 5/16-26.............

Bernhard

[MONAHAN STEAM MODELS]

Thank you Alex,

That seems like a strange choice of threads to use.

5/16"-28 is fairly common over here in the States.  5/16"-27 is a little rare but it is used from time to time.

5/16"-26 is really rare. I wonder why they chose to use this thread count...? Any idea's?

Regards,

Nick

[AlexC]

 :) :)

Hi Bernhard and Nick,

the 5/16" x 26 thread is very common over here in the UK.... in fact I cannot even find a 5/16" x 27tpi listed in any of my tool listings.(9/16" x 27tpi is the only one I can actually find).

The 26tpi series is also known as 'Cycle Thread' or 'Brass Thread' and is a constant pitch for all sizes from 5/32" Dia up to 1 5/8" dia.

I guess the reason most UK boiler guys use this particular size is twofold....: -

1/  It is used in a bronze bush (normally). 
2/  It prevents the Safety Valve from being fitted into the wrong bush/place on the boiler.......

If it had the same thread (5/16" x 32tpi) as e.g. the filler bush on either Chedder boilers, or one of mine for that matter, then it could be that the safety valve could be mounted e.g. on the top of the take-off turret.... this would not be the correct place for a SAFETY VALVE.... since this component should not be mounted close to a steam take -off point. (THINK ABOUT IT).

I agree, any other coarse thread could equally be used for this, however: -

Most of the UK manufacturers, that make small safety valves, list ones for 5/16" x 26tpi, so I think it may be a traditional size for this use.

What size do you use for yours Nick?

Bernhard..... you mentioned fitting a probe of some sort in the Safety Bush...... so where are you going to fit the Safety Valve?

Best regards.

Sandy (AlexC) 

[wideawake]

A really helpful contact for this sort of thing is Jerry at clevedon.steam@virgin.net  He's ex-Cheddar models and sells things on ebay.  Try an ebay search for Cheddar proteus.   He also sells off bay and will service Cheddar boilers.

No connection other than a very satisfied customer

cheers

Guy

[Bernhard]

hi..Thanks Sandy.........i will like to have a el waterpump on the boiler...like this,,, http://www.home.earthlink.net/~bfindus/id1.html   i have one in my lady Jane and it works ok,,,  bot the problem whas to get the right thread for the probe,so i can come water in from it to..,,  her is the mail from the man there make them
Bernard – 5/16 – 26 in not a standard thread in the USA, 5/16-18 and 24 are
the common threads.  We have searched and found a 5/16-26 die that could be
used.  The problem is that since it is special, you would have to pay for
the cost and shipping of the die ($20.00) plus the cost of the
Goodall/Sensor Probe, $50.00.  There would not be any additional charge for
the special machining; however this would make the probe somewhat expensive
and would increase delivery time.
bot i will let him make it..............>Thanks
Bernhard

[MONAHAN STEAM MODELS]

Hi Sandy,

Just got back from a long day at the pond running some steam boats with some good friends.

Thanks for the info.

I had a feeling that Cheddar used a different thread for their safety valves to keep them from being mounted in the wrong place.

We use 1/4"-40 threads for our safety valves which as you know is a fairly common thread internationally. However we do not refill the boilers by removing the safety valve. Instead the boilers are refilled by removing a 5/16"-32 boiler fill plug. I have notice that a couple of other manufacturers use 1/4"-40 threads for their safety valves too.

5/16-27 is a strange thread but listed in a copy of my Machinists Handbook. However 5/16"-26 is not. I guess you cannot depend on these things to be complete. :(

A good friend of mine has one of your Horizontal boilers and he loves it. In fact it is shown in his open steam launch on our website at the top of the gallery page. I have to say your boilers are a piece of Fantastic Craftsmanship! 

Best Regards,

Nick

[MONAHAN STEAM MODELS]

Bernhard,

Sorry for the mix up on what the correct threads were.

Regards,

Nick

[AlexC]

 :)

Bernhard,

I am a little concerned that you are contemplating removing your SAFETY VALVE in order to fit a water level/pump fitting...... I am familier with the BF Industries units, and yes they work very well, however, they also make several different probes.

I located the documentation I have for these units and they list a standard probe (not having the Goodall addition) which can easily be made with a 1/4" x 32tpi model engineering thread.
If you used one of these with a length of between 2"  and  2 1/4" fitted into the top of your steam dome (in place of the filler/vaccuum valve) then fed the electric pump via a standard non-retun valve into one of the bushes provided for this, in the end of the boiler,  then you could retain your SAFETY VALVE.

I would certainly strongly advise that you, or anyone else for that matter, DO NOT run without a SAFETY VALVE, just to make provision for a Goodall type filler when you can easily do without the anti-vaccuum gizmo.
A proteus boiler on full burner can very quickly get way over pressure, you should never rely on burner control to keep things in check..... it can fail.

The boiler can just as easily be filled using the electric pump, so why do you wish to have a Goodall valve as well?
The standard, non-Goodall, probe will be considerably cheaper as well.

I am sure Nick would agree with this advice.

Nick, thanks for the compliment, your own boilers are also of excellent quality.

As for 'Daves' model...... an absolutely superb piece of construction, and I am very pleased he is getting such excellent run times from the boiler/Anton combination.

Keep happy.

Best regards.

AlexC

[Bernhard]

Hey............Many thanks Alex............i understand..i will not use it with aut a safty valve,,,i whas thinking to have it in the top of the steam dome...bot now i maby will have it don as you sai....bot i whas not shure,,,that i cut use the dome for a probe,,,that it whas to low and not will touch the water,,,sorry my english,,,i have a gas regulator on,,,there stop the gas around 60 psi,,,and i have a clark valve in both side of the boiler,,,one i use for the normal water pump on the proteus,,,bot i will reale like to have that elpump on,,,it work so nice........i will like to have that special probe on,,,that i many times use real hot water...so it is fast to feel it up with my big syring,,,,
thanks

regards Bernhard