Gate Valves - Care and Feeding Thereof

[Jammer]

Actually with rising stem gate valves you can tell whether the gate is up or down by the position of the stem.

[deblen]

I agree with using bronze marine ball valves & Groco style Thru Hull per following:
https://marinehowto.com/replacing-th...-and-seacocks/

https://marinehowto.com/category/plumbing/


http://coxeng.co.uk/metallurgy/brasses-and-bronzes/




I have found Fluid Film,which is lanolin based,to be an excellent water resistant lube for most underwater needs. I believe another brand of lanolin based lube is Lanocote?


https://www.fluid-film.com/

Cheers/Len.

[Dockhead]

Originally Posted by Jammer

Actually with rising stem gate valves you can tell whether the gate is up or down by the position of the stem.

Never seen one of those on a boat.

But in any case, this is only one of the objections to gate valves.

To my mind, the more serious one is the risk of their being jammed open.

[GordMay]

Originally Posted by boatpoker

Sorry old thread but ... I completely agree with everything you say about gate valves. Please help me out if you can. I simply cannot find any official online reference for ISO, CE or RCD prohibiting gate valves on recreational boats ... Do you have an official citation for this ?

IIRC, the ISO has never required quarter-turn type valves.

The original [1994] standard for metallic/non-metalic seacocks and through-hull fittings was IS0 9093-1, [IIRC, the current standard is ISO 9093-2021], which stated:

“... 3.2 seacock: Any valve of the ball, cylinder, plug, gate or butterfly type directly fitted to a hull or a through-hull fitting.
3.3 corrosion-resistant: Material used for a fitting which, within a service time of five years, does not display any defect that will impair tightness, strength or function..."

IS0 9093-1 [1994] Seacocks and through-hull fittings
➥ https://cdn.standards.iteh.ai/sample...093-1-1994.pdf

ISO 9093:2020 [2020] Seacocks and through-hull fittings
➥ https://www.iso.org/standard/75179.html