Brian,
Ball valves typical get tight from not operating the valve on at least a
scheduled basis. Care has to be given that sand and/or calcite deposits
occur in the valve which can damage the sealing surfaces or scratch the
ball. Butterfly valves may be an option as they have a limited capability
to throttle flow where ball valves tend to be all or nothing (100% flow or
0%). Butterfly valves can also be affected by sand and calcite deposits.
Butterfly valves are available in SS but are very pricey when found.
Another option to contain costs is to use SS lined valves vs. a complete
body of SS.
R/Jay
Respectfully,
Jay K. Jeffries
Andros Is., Bahamas
As scarce as the truth is, the supply has always been in excess of the
demand.
-Josh Billings
_____________________________________________
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of Brian Cox
Sent: Saturday, January 03, 2009 8:39 PM
To: Personal_Submersibles@Psubs. Org
Subject: [PSUBS-MAILIST] Soft ballast venting valve
Happy New Year All,
Does anybody have a suggestion for a ballast venting valve for a soft tank (
my ferro structure ) that is around 1 1/2" diameter or maybe 2" , I will
most likely use a stainless ball valve but I'm worried that eventually it is
going to sieze up on me. It seems like those ball valves get awfully hard to
turn after a while. The butterfly valves that I've seen ( for farm
irrigation ) seem to turn easier , but I haven't seen them in stainless.
Thanks
Brian, Ventura, CA
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