seacock

[HAWAIIAN]

Today, when I changed my impeller, I found out the sea water still come in from the raw water intake hose even the seacock in the closed position. The seacock on/off very smooth but why the water still come in even the seacock in off position? How can I fix the problem?


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[LORDNELSON]

What type of seacock do you have?

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[chas]

Sounds as if it might be a gate valve which has bust. Strongly advise that you renew the seacock.

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[AndrewB]

Two possible reasons ...

(i) Something is jammed in the opening, so that the valve won't shut properly even though it screws down. This is particularly common with gate valves, where fouling can develop in the gate if they are not left in the closed position.

(ii) It's a gate valve and the central spindle has stripped, so its not screwing down properly. They all do sooner or later as they are made of brass which de-zincs and crumbles. A very easy action on a gate valve is always suspect.

Avoid gate valves, avoid brass. If you must use, dismantle and check annually, replace after four.

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[Becky]

You must change the seacock. I have just had to do the same thing as the backing pad had disintegrated and the whole thing had begun to loosen. Be careful what you replace it with. It must be salt water resistant. I approached Aquafax at the show and had a considerable lesson on what is and what isn't suitable. You could give them a call, number is 01582 568700, fax 01582 568720. They seem to be very helpful

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[AvanLoon]

Screw a proper ball valve behind this leaking one for the time being. As soon as there is a possibility to dry out, remove the old valve and screw the new ball valve in its place.
Kind regards

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[seaesta2]

A lot of modern gate valves are cheapo made in the far east and do not seal even when new. They merely slow the flow down. I have had this repeatedly in my DIY plumbing and am only using ball valves in future.

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