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Old 20-07-2007, 00:59   #1
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Replace exit-valves

I was thinking of replacing the brass exit-valves (shower-toilet-kitchen..) by stainless steel ones.
Only the valves though , would that cause any problemes concerning corrosion ?
Meaning, would the brass hulltransit be sacrificed because of galvanic corrosion ?

Thanks and regards
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Old 20-07-2007, 01:18   #2
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Aloha bobs,
It is not a good idea to mix metals. There will be galvanic corrosion. Bronze valves are very good. No need for stainless. Don't ever use brass.
I'm thinking marelon is good for many of my projects. They don't corrode and don't need much maintenance and don't need to be bonded.
You'll hear other opinions I'm certain.
Kind Regards,
JohnL
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Old 22-07-2007, 02:30   #3
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Quote:
Originally Posted by SkiprJohn
Aloha bobs,
It is not a good idea to mix metals. There will be galvanic corrosion. Bronze valves are very good. No need for stainless. Don't ever use brass.
I'm thinking marelon is good for many of my projects. They don't corrode and don't need much maintenance and don't need to be bonded.
You'll hear other opinions I'm certain.
Kind Regards,
JohnL

-------

No other opinions sofar John.

regards
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Old 22-07-2007, 04:51   #4
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Excerpted from the CruisersForum discussion at: Titanium

TITANIUM:
Titanium is 40% stronger & 40% lighter than stainless steel and most important, titanium is very corrosion resistant.
Listed below are some, but not all forms of corrosion that have virtually no effect on Titanium in a seawater environment:
* Cavitation Corrosion
* Crevice Corrosion
* Electrochemical Corrosion
* Electrolytic Corrosion
* Erosion Corrosion
* Galvanic Corrosion.

For further information, including products and pricing:
Marine Hardware - Titanium, Great Advantages Over Other Hardware
Titanium Thru-Hulls: http://www.titan-marine-hardware.com...thru-hulls.htm
Titanium Hose Clamps: http://www.titan-marine-hardware.com...ose-clamps.htm

Q: I asked “Titan” what they recommended to use for Seacocks with their Titanium Thru-Hulls. I would understand their (following) answer to be an interim recommendation only.

A: Hello Gord, actually we're developing a line of Titanium Seacocks/Ball Valves that should be available mid-2005. Titanium will not corrode in seawater as you know, and other metals will still have their Galvanic corrosion issues, but not the Titanium. We would recommend using the Marelon as no corrosion issues would exist. However with composite materials the issue of melting in any fire situation exists, and you need to be careful with exposure to sunlight, as I'm told the material degrades under those conditions.
Best regards, Hugh Richards
customerservice@titan-marine-hardware.com

A recent perusal of their website doesn’t reveal any Titanium Seacocks - they must be “a little” behind schedule in introducing them.
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Old 22-07-2007, 09:01   #5
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Well, if you really do have brass valves then you had better change them quickly. However, I suspect that you have bronze thru hulls and valves. At least I hope that is what you have. It is recommended not to mix metals in direct contact with each other.
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Old 22-07-2007, 12:20   #6
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Aloha again Bobs,
Oh, I forgot to mention that it is much better to have ball valves than gate valves so if you have gate valves then they should be replaced by Marelon ball valves or Bronze ball valves. Never use brass.
JohnL
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