WTC seals

[paul von braun]

Dear All,
I would now welcome all your suggestions as to the best way to make the water tight seals at the ends of the WTC. Bear in mind that mine is being scratch built and has an internal diameter of 110 mm.


Regards,







Paul Brown.

[tom spettel]

Call Skip at Sub Tech

Call Skip at Sub Tech he has all kinds, and Frank at Sub Concepts has the O-ring style.
Hope this helps
Tom

[Guest]

If you want to seal

If you want to seal the cylinder in a way that it is easy to open and close, then use o-rings as suggested.

These can seal on the inside circumference of the cylinder or on the edge of the cylinder.

Both methods have advantages and disadvantages. However, unless you have access to a lathe, I would recommend the latter approach.

You can also seal the cylinder with silicone sealant, which although less elegant, is simple and cheap.

Obviously, once this seal is broken it is less reliable than the o-ring method, and will likely require reapplication of sealant.

Andy

[paul von braun]

Okay, that matter decided -

Okay, that matter decided - is there any way to test the efficacy of the seals? Short of attracting funny looks at the local swimming pool as I dive with the wtc and check for water ingress when I surface!!! I hope I am giving you guys some good laughs.



Regards,





Paul Brown.

[koeze]

A lot of people put

A lot of people put a bit of pressure (couple of tenths of bars) in their WTC. When you hold it under water you should not see bubbles coming out

If you do have access to a lathe, there are tables indicating how wide and how deep the o-ring groove must be to achieve a good seal. Be carefull, there are two different tables, one for a static seal (as used in a WTC for the endcaps. However, for pushrods and such the groove must be differently sized.

Good luck.

EJK

[Guest]

A lot of people put

A lot of people put a bit of pressure (couple of tenths of bars) in their WTC. When you hold it under water you should not see bubbles coming out

If you do have access to a lathe, there are tables indicating how wide and how deep the o-ring groove must be to achieve a good seal. Be carefull, there are two different tables, one for a static seal (as used in a WTC for the endcaps. However, for pushrods and such the groove must be differently sized.

Good luck.

EJK

Fit a shraeder valve (tyre valve). Get a fistful from the local tyre fitters for the price of a drink- they tend to replcae perfectly good valves as a matter of course.

This will enable you to 'pump up' the WTC as Koeze suggests.

Don't forget to seal the valve where it exits the WTC, else you'll be defeating the object!

Also, purchase a tube of silicone grease (I use the Servisol brand) and apply this, sparingly to all the o-rings.

It helps them seal well, and keeps the rubber supple.

Andy

[tom spettel]

Parker Seals has a book

Parker Seals has a book on tolerances the O-rings you want
and silicone grease. they have everthing for sealing
Tom