Anti-siphon vent in raw water loop
 

Hi again,

I've relocated the anti-siphon vent in our raw water circuit.

Originally it was a typical installation with one of those plastic
vented valves at the top of a U.

There was evidence of this installation spraying water on that side of
the engine, causing corrosion on the starter and starter connections.

For this reason, Nigel Calder recommends this anti-sipon be plumbed to
the outside of the boat (above the waterline at all angles of heel), or
as he did on his boat, into the cockpit.

I plumbed it into the cockpit on a vertical wall, about two feet above
the cockpit sole.

When we started the motor today, I wasn't that surprised to see that
water was making its way up the vent and dripping into the cockpit.
We'd rather not have 200 degree water in the cockpit, so we'll have to
remedy this.

Is there any reason why I can't just plumb a one way check valve into
the line, to stop water from exiting, but to let air enter?

Or, do I need some kind of pressure valve?

Thanks for the help,

Mike.

Anti-siphon vent in raw water loop
 

beaufortnc wrote:
Hi again,

I've relocated the anti-siphon vent in our raw water circuit.

Originally it was a typical installation with one of those plastic
vented valves at the top of a U.

There was evidence of this installation spraying water on that side of
the engine, causing corrosion on the starter and starter connections.

For this reason, Nigel Calder recommends this anti-sipon be plumbed to
the outside of the boat (above the waterline at all angles of heel),
or as he did on his boat, into the cockpit.

I plumbed it into the cockpit on a vertical wall, about two feet above
the cockpit sole.

When we started the motor today, I wasn't that surprised to see that
water was making its way up the vent and dripping into the cockpit.
We'd rather not have 200 degree water in the cockpit, so we'll have to
remedy this.

Is there any reason why I can't just plumb a one way check valve into
the line, to stop water from exiting, but to let air enter?

Or, do I need some kind of pressure valve?

Thanks for the help,

Mike.

Very useful for washing your feet!

Dennis.

Anti-siphon vent in raw water loop
 

You need to service or replace the anti-siphon valve. It's a little
duckbill valve and is obviously work away, has some salt keeping it
open or something like that. It shouldn't be spraying water out like
that.

Anti-siphon vent in raw water loop
 

Why not replace it with a tee piece leading to a thin pipe which drains
overboard at all angles of heal?

This should leak water at all times if water is running through the seawater
circuit.
Thus providing a vent and an indication of water flow.

I believe it is caller a "Piddler"

Alec


"beaufortnc" wrote in message
oups.com...
Hi again,

I've relocated the anti-siphon vent in our raw water circuit.

Originally it was a typical installation with one of those plastic
vented valves at the top of a U.

There was evidence of this installation spraying water on that side of
the engine, causing corrosion on the starter and starter connections.

For this reason, Nigel Calder recommends this anti-sipon be plumbed to
the outside of the boat (above the waterline at all angles of heel), or
as he did on his boat, into the cockpit.

I plumbed it into the cockpit on a vertical wall, about two feet above
the cockpit sole.

When we started the motor today, I wasn't that surprised to see that
water was making its way up the vent and dripping into the cockpit.
We'd rather not have 200 degree water in the cockpit, so we'll have to
remedy this.

Is there any reason why I can't just plumb a one way check valve into
the line, to stop water from exiting, but to let air enter?

Or, do I need some kind of pressure valve?

Thanks for the help,

Mike.

Anti-siphon vent in raw water loop
 

beaufortnc wrote:

When we started the motor today, I wasn't that surprised to see that
water was making its way up the vent and dripping into the cockpit.
We'd rather not have 200 degree water in the cockpit, so we'll have to
remedy this.

You need a new valve. They don't leak when working right.