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Old 31-10-2011, 06:48   #1
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Exhaust: Ball Valve

I have heard of people putting Ball Valve to avoid water entering the exhaust piping
Any one can inform me about it: What is it? where to install it and how? prices?
Thank you
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Old 31-10-2011, 08:21   #2
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Re: Exhaust: "Ball Valve"

As far as I know, the only system using a seacock, is in a "Dewatered" exhaust system ; which is wet exhaust system, in which the water and exhaust gases are subsequently separated, and discharged through individual outlets.

See Figures 6a & 6b, here
http://www.marinesurveyorschool.org/...%20Systems.pdf
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Old 31-10-2011, 08:53   #3
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Re: Exhaust: "Ball Valve"

I put one of these on the exhaust outlet. I could hear it flapping shut when a swell ran up on us, sailing off the wind. I don't think I'd want a ball valve in the exhaust line--just my personal opinion.

SIERRA Exhaust Flapper Valves at West Marine

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Old 31-10-2011, 09:00   #4
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Re: Exhaust: "Ball Valve"

Quote:
Originally Posted by Alecadi View Post
I have heard of people putting Ball Valve to avoid water entering the exhaust piping
Any one can inform me about it: What is it? where to install it and how? prices?
Thank you
I think , Alecadi is asking about a valve to protect the engine from the possible reverse flow of water when it is not running -when you sail.
T.
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Old 31-10-2011, 09:06   #5
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Re: Exhaust: "Ball Valve"

The flapper does that, brilliantly!

And cheaply!!!
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Old 31-10-2011, 09:07   #6
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Re: Exhaust: "Ball Valve"

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I think , Alecadi is asking about a valve to protect the engine from the possible reverse flow of water when it is not running -when you sail.
T.
My concern is overflowing the engine with water when MOTORING with seas coming aft.
Sorry if my question was not clear enough.
Alec
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Old 31-10-2011, 09:10   #7
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Re: Exhaust: "Ball Valve"

If you're motoring the exhaust pressure will keep the water from coming in. It's when sailing with following seas that you have to worry about it.
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Old 31-10-2011, 09:16   #8
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Re: Exhaust: "Ball Valve"

If you are motoring, you cannot have the valve shut, so I am not sure the reasoning While motoring. Certainly, when you are sailing, having the flapper (as shown) would work to keep the water from pushing it's way back to the engine. I have heard the some people use a ball valve for this, but I would think it would be a pain to constantly rememeber to open/shut it, especially if it is difficult to reach.
The exhaust hosing should loop well above the waterline after the muffler to help prevent back flow.
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Old 31-10-2011, 09:19   #9
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Re: Exhaust: "Ball Valve"

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If you're motoring the exhaust pressure will keep the water from coming in. It's when sailing with following seas that you have to worry about it.
Hud I respect opinions of more experienced sailor as yourself, but I've read so many time about people loosing engine when motoring with following seas..
I'm quite confused now..

On the other hand I think the flap valve should be a good solution.
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Old 31-10-2011, 09:22   #10
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Re: Exhaust: "Ball Valve"

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Originally Posted by Alecadi View Post
Hud I respect opinions of more experienced sailor as yourself, but I've read so many time about people loosing engine when motoring with following seas..
I'm quite confused now..

On the other hand I think the flap valve should be a good solution.
Can you dig up a few of those accounts for us to look at? I would be shocked if anything had the force to back water up into a running motor.

Most of the accounts of problems with water getting into the motor that I've read have come from the lack of a proper anti siphon in the exhaust-water injection and perhaps very rough conditions in which the boat would hobby horse severely enough that water could make its way into a cylinder despite that.
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Old 31-10-2011, 09:45   #11
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Re: Exhaust: "Ball Valve"

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Can you dig up a few of those accounts for us to look at? I would be shocked if anything had the force to back water up into a running motor.

Most of the accounts of problems with water getting into the motor that I've read have come from the lack of a proper anti siphon in the exhaust-water injection and perhaps very rough conditions in which the boat would hobby horse severely enough that water could make its way into a cylinder despite that.
Sorry I didn't keep track and probably I misunderstood, thinking that the engine was on in the case I've read.
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Old 31-10-2011, 09:52   #12
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Re: Exhaust: "Ball Valve"

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Originally Posted by Alecadi View Post
Sorry I didn't keep track and probably I misunderstood, thinking that the engine was on in the case I've read.
No worries. We all misunderstand or misread stuff sometimes.

It is still a good question though. Should you have a valve in the exhaust that can be closed while sailing without the motor running? I've hear advice both ways.
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Old 31-10-2011, 09:54   #13
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Re: Exhaust: "Ball Valve"

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No worries. We all misunderstand or misread stuff sometimes.

It is still a good question though. Should you have a valve in the exhaust that can be closed while sailing without the motor running? I've hear advice both ways.
I think that the flapper solution is quite interesting.. and cheap...
Anybody has experience with this?
I confess I've never seen a sailboat with one so far (or I don't look at the exhaust of other boats )
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Old 31-10-2011, 09:59   #14
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Re: Exhaust: "Ball Valve"

Alecadi,

The only thing I can come up with that's "motoring" related is the potential for cooling water to get into the cylinders if you crank a diesel too long without it starting. When starting my engine for the first time after a seasonal layup, I'd always leave the raw water seacock just cracked open a little bit until the engine fired up, then I'd open it all the way.

That's the only way I can think of that seawater could get into an operating diesel.
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Old 31-10-2011, 10:16   #15
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Re: Exhaust: "Ball Valve"

External exhaust flapper valve very good idea.
Internal in-line flapper valve bad idea...same as one way bilge flapper valve.
Have seen passagemakers with ball valves...but thought bad idea as
would be one more item to worry about if needed motor operating quickly.
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