Not surprising. A proper flanged and bolted bronze seacock cost about 4
times as much as a throughhull and ball valve. I compromised with
flanged and bolted Marelon.
doug dotson wrote:
Hummmm. It seems that many production boat manufacturers
are doing it wrong then. My old C&C didn't have any of the seacocks
through-bolted. On my current boat the seacock has a flange which
does secure the thru-hull, but there are no provision for bolts.
Doug
s/v Callista
"98stratus" wrote in message
...
Wrong...
if you use a proper seacock, throw the nut from the through hull away.
The
seacock should be through bolted, but mose people seem to screw it to the
backing plate. Which is better than nothing. Also throw away those ball
vales, they are not designed for this task and. Yes you are correct you
only have 2 or 3 threads seperating you from a sinking!
Pierre
"doug dotson" wrote in message
...
I think you have answered your own question. To the best of
my knowledge ball valves are not acceptable for seacocks.
Not sure why. That may be why thru-hulls and seacocks use
straight threads. So ball valves won't fit. I've never had a seacock
bolted to the hull. Normally the thru-hull is bedded and secured with
the retaining ring and the seacock is just threaded on. Even
though the seacock has a flange that will accept bolts, the flange
has always just floated.
Doug
s/v Callista
"Trent D. Sanders" wrote in message
e.com...
We replaced all the through-hulls on my Islander 29 with new bronze
through-hulls and bronze/stainless ball valves. The threads on the
through-hulls were straight threads, while the threads on the ball
valves were tapered [pipe] threads. As a consequence the ball valves
only tightened down on the through-hulls by about 2 "turns". The
yardman that did the job said that was the "accepted practice" and not
to worry about it.
But,,,, in this month's issue of Good Old Boat's newsletter supplement
there's this,,, "You must use straight threads on both the valve and
through-hull, or tapered on both. Mixing tapered and straight threads
is the worst thing you can do, and sadly it is [or was] common".
So, my question is,,,, does anyone know where to obtain
bronze/stainless ball valves with straight threads? Easier to replace
the ball valves rather than the through-hulls.
I'd use proper seacocks but they require bolting to the hull which
would be difficult with a fiberglass hull.
Thanking you in advance,
Trent Sanders
S/V Cimba
Marina Del Rey
Southern California
--
Glenn Ashmore
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at:
http://www.rutuonline.com
Shameless Commercial Division:
http://www.spade-anchor-us.com