Radius 42 SRV solution

Hello from France,

I was dismantling a Radius 42 with the big SRV because there was a small flame coming out of the little hole from the SRV. So I suspected there was something wrong in it.
Here it is : The brass washer was cracked as you can see on the photo. I also noticed yhat the shape of the « Viton gasket » was strange.
Do you have a solution for solve this problem please ?
In the meantime, I read that we could screw another filler cap ??
Thank you for your help.

Yannick

 

Pour l'instant, cela fonctionne parfaitement avec un Optimus 8 SRV. Mais est-ce sécuritaire ???? Après tout ce radius 42 ressemble à un Primus 71 non ?

Yannick

 

A new gasket can be made from 1mm Viton sheet- they started life flat but gain the unusual shape in service.

You could try brazing up the cracks in the brass washer, or try a replacement cut from thin brass sheet with scissors- I'm not sure the lack of a lip around the edge will cause much of an issue?

 

@Blackdog Thanks for your answer. You think the gasket ha to be changed ?
Concerning the brass washer it is very thin, I have to mesure uts thickness but I guess it is around 0,1 mm. Yes the lip around the edge is not easy to make for sure !

 

@Yannick Michel Yes, the gasket should be soft, pliable and flat. Some photos of what they look like new here, along with other information and a link to further discussion.

The brass washer would be easy to cut from shim material which is obtainable in many thicknesses. If you can find a former the correct size, it may be possible to form a lip with a hammer.

 

@Blackdog Thank you very much for the link. The video made by Berniedawg are amazing. Making this brass washer and viton gasket is not easy and you need a lot of tools. Do you know if we can contact Berniedawg to know if he could sell these parts may be ??

 

@Yannick Michel The Viton gasket/seal is easy to make- you would require some Viton sheet, a pair of scissors and a couple of punches (sets of various sizes are easy to find and not enormously expensive).

Alternatively, @mr optimus bought his gasket/seal from Base Camp, who may be able to deliver to you, it might be worth contacting them.

 

Thank you.

 

@Blackdog I watched the Berniedawg video on YouTube and the dimensions of the viton gasket on mine is different : near 22 mm instead of 19,6 mm (Berniedawg video)

 

@Yannick Michel I haven't watched any videos but if your Viton gasket looks correct and fits well amongst the other components, it's probably best to immitate it. I don't think complete accuracy is critical.

 

@Blackdog in his video he says that the fives holes in the viton gasket are not necessary and that it works with only the central hole. Well, i think I just has to buy a 1mm thick Viton sheet and I think I will be able to make this new gasket. for tje brass part, it could be more difficult.

 

Base Camp du not have the brass gasket.
I will try to make it.

 

There were a few different Radius caps with similar general design of the SRV - different heigth and threads.
The spring and spring holder must fit the upper part of the cap - the central hole in brass and rubber diaphragm must be small and centered - outer diameters need to be held by upper cap and there must be at least one of the six larger holes in the rubber.
Rubber thickness is non-critic as long as it is held tightly between the cap halves - but it should be fuel-proof.

 

@Lennart F Thanks. There must be at least one of the 6 lzrger holes ? Do you know why ? For you the central hole is not sufficient ?

 

There need to be a by-pass outside the central valve part of the diaphragm to ensure not building pressure that interfere with with the release action - the center hole is the one releasing safety vent and working as valve seal.
The brass part is just to support the rubber.
The reason to have six large holes? Maybe it just was enough rubber to get six NRV pips for pumps.

 

An interesting thought, excellent business sense if so. I wonder if the diameters match up...

 

@Yannick Michel
At Fogas.se you can get the black rubber disc here:
Tusentals gasolprodukter på nätet

(cheaper, if one has the skills, to make it yourself).
@presscall made a thorough guide here:Radius safety cap seals.

A pricey option is from Taiwan
Radius – KiteLamp 汽化燈爐
(Scroll a bit down the page)

 

@Harder D. Soerensen Hello from France. Thank you for the links !

Yannick

 

I was finally able to duplicate the 2 parts of the Radius 42 SRV with a sheet of Viton 1 mm and a foil of brass of 0,15 mm. I can not test at which level of pressure the SRV would be in action but the stove seems to work nicely.

 

Good work, a great improvement on what was there before!