Nemrod Snark III LP diaphragm and exhaust valve?

[Fibonacci]

I'm now turning my attention to the Nemrod Snark LP diaphragm and exhaust valve.
These were moulded from natural rubber, and are often found totally disintegrated on older 'Peacock' Snarks.

I was able to get a NOS example of each to 3D model with a view to getting a run produced in food grade silicone rubber, which should improve WOB as well as having a greatly extended service life.

The original diaphragm has a series of undercuts where the #202 plate fits, these should be able to be reproduced using a removable stripper plate on compression moulding. I have also reproduced the 'anti-stiction' stipples that were originally put in the OEM tool by hand!

Will need to talk to suppliers...


Nemrod Snark LP Diaphragm ASSY exploded by fibonacci101, on Flickr


Nemrod Snark Exhaust Valve by fibonacci101, on Flickr

[vance]

I love that you are looking toward the future with new replacement parts!

FYI, a USD single stage main diaphragm will fit the Snark. I don't know if there are any issues, but they seem to work. The Scuba Museum is offering new silicone exhaust valves. Also, the repro box rings fit as well.

I made a thread here about interchangeable parts a while back.

[Fibonacci]

Aha so they do... cross that one off the list then, better get some
SCUBA Museum store

Also they had some new style LP seats briefly!
SCUBA Museum store

[spirou]

IMG_20231016_192855_798 by Patrick Michel, sur Flickr

IMG_20231016_180137_702 by Patrick Michel, sur Flickr

I just fist finished this little guy, the exhaust valve was a bit tired so I put a new silicone from scuba museum, and same for the main diaphragm.

I am surprised by strength of the second stage spring he is much stronger than  the silver.

The opening is smooth but not the same ventury assistance than the silver, for this fist try will be sure to have not free flow

Cheer's

Fred

[Fibonacci]

spirou
I just fist finished this little guy, the exhaust valve was a bit tired so I put a new silicone from scuba museum, and same for the main diaphragm.

Which Scuba Museum main diaphragm best fits the Snark?

Save me some more work so I can concentrate on the LP seats   

[vance]

USD single stage (also fits Kraken or regs with HPR).

[spirou]

Oct 16, 2023 13:25:56 GMT -8 Fibonacci said:

spirou
I just fist finished this little guy, the exhaust valve was a bit tired so I put a new silicone from scuba museum, and same for the main diaphragm.

Which Scuba Museum main diaphragm best fits the Snark?

Save me some more work so I can concentrate on the LP seats   

Of course the blue 🔵 for single stage 😄😉

Fred