Belville washer lube question

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The washer stack is not exposed to high pressure air, so any good metal lubricant is fine to use. I have used everything from simple 30W non-detergent oil to expensive Krytox at different times over the years and can’t say it makes any meaningful difference.

Regarding other things you may want to do while it is apart, inspect both surfaces of the valve seat with the air of magnification. Dress them smooth with fine wet sanding to reduce pressure creep and improve the longevity.
 
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nervoustrig said:
The washer stack is not exposed to high pressure air, so any good metal lubricant is fine to use. I have used everything from simple 30W non-detergent oil to expensive Krytox at different times over the years and can’t say it makes any meaningful difference.

Regarding other things you may want to do while it is apart, inspect both surfaces of the valve seat with the air of magnification. Dress them smooth with fine wet sanding to reduce pressure creep and improve the longevity.
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Thanks, Jason
How fine an abrasive should be used?
Would this be dressing 2 parts against one another?
Thanks
Edward
 
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Just smooth the two surfaces individually. It should not be necessary to lap them together.

For the metal part (i.e. the tiny volcano rim), the goal is to have a polished surface free of any microscratches that would allow air to slowly weep through, or contribute to abrading the plastic part over time.

For the plastic part, I recommend taking it out to at least 2000 grit. That’s plenty for the common Delrin/acetal seals. Though if it were PEEK or one of the very hard plastics, taking it out to a polished surface is worthwhile.
 
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