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Old 08-04-2013, 03:32 AM   #1
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Default pump check valves

I'm looking for recommendations on check valves from my pump set up.

I occasionally have problems with backwards flow from siphoning when i forget to close a valve. I see dudadiesel sells some, but they look like they would really reduce flow.

http://www.dudadiesel.com/search.php?query=check+valve

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Old 08-05-2013, 01:46 PM   #2
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If you decide to go with a check valve, just make sure to find out what pressure the valve needs before it opens. For instance on the 809-HS models, the max pressure they make is only about 5psi and that's at dead head....so if you have a check valve that has a higher opening pressure, you will never get any flow through the system....

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Old 08-06-2013, 03:34 PM   #3
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Thanks walter. I guess I'll stick with the ball valves for now.

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Old 08-07-2013, 02:36 PM   #4
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A quick check of ball and swing checks shows a cracking pressure right around 4.5 psi. That's a no go.

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Old 08-07-2013, 03:28 PM   #5
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I'm actually using a march AC-5B-MD, it could probably push that valve open, but I don't think I would have much in the way of flow.

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Old 08-07-2013, 03:32 PM   #6
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If you have the "HS" models it would work...but with the resistance of the check valve in place, you would be limited to a flow of about 2gpm....
If you have the 815 pump or the upgraded impeller then your flow would be a hair over 5gpm...
These flows are not factoring in any physical head height you have in the system...its only the check valve...

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Old 08-07-2013, 03:34 PM   #7
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With the series 5 you should be at about 13gpm....again not factoring the physical head height in the system...so if you had like 5' of head height the flow would be a hair over 10gpm...

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Old 08-07-2013, 03:51 PM   #8
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Thanks Walter, like always you've been extremely help full.

On another note, I think I remember you posting
Ocean going boats were a hobby of yours. Do you restore or build boats? That's something thats always really interested me. But I don have the space for it now. The next house we buy is going have enough property for me to build a pole barn. Ocean kayaks are the biggest thing that I can make right now.

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Old 08-07-2013, 04:08 PM   #9
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Quote:
Originally Posted by malador View Post
Thanks Walter, like always you've been extremely help full.

On another note, I think I remember you posting
Ocean going boats were a hobby of yours. Do you restore or build boats? That's something thats always really interested me. But I don have the space for it now. The next house we buy is going have enough property for me to build a pole barn. Ocean kayaks are the biggest thing that I can make right now.
It is my hobby...but im more in to the cigarette style boats. My first "big" boat was a 30' Scarab...the (Blue/yellow)
sold that and took a break for a few years while I worked on my house...currently building a 22' Chris Craft 222 Stinger...just did the paint/body work on it and now its time to put it all back together
scarabkeywestflyby.jpg   scarabengines.jpg   new-paint1.jpg  
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Old 08-07-2013, 04:29 PM   #10
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WOW! Beautifull looking boat. I've probably never been in.a boat that's half as fast as your boat looks. Plus there are probably no fish blood stains in your boat
Thanks for sharing the pictures.

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