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Thread: Bag fill/drain hose
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09-26-2018, 09:39 AM #21However, they don't do much when emptying the bag to keep air from flowing back into it from the vent. I still got a lot of air back into the bag -
They won't stop passive drain, regardless of which check valve it is, because the flow direction is from the bag out the vent.
@ Shoebox,
You still got some season left? What size is your vent line? Ill send you a couple to try if you like. PM me your address.
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09-26-2018, 09:43 AM #22
Air may be able to escape a bit against a closed valve because air molecules are smaller than water, but regardless, you could pop a bag or fitting if you had check valves installed to stop water flowing overboard.
If the valve is spring-loaded, I guess it could stop passive drain once the bag is no longer completely full (i.e., under pressure). I'm fairly certain my check valves are not spring-loaded. That's why I ask which valves MLA uses.
Even with that type of valve, the bag won't remain completely full, because there is quite a bit of pressure in a truly full bag, and would drain overboard until pressure equalizes.2019 Supra SL450
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09-26-2018, 09:45 AM #23
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09-26-2018, 09:47 AM #24Senior Member
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I’m just telling you what the stated purpose of the wakemakers check valve is. I believe they are spring-loaded in some capacity. And are inserted to prevent passive draining during a surfing session.
I think a check valve to you is more about draining after a session then it is preventing passive draining while the bag is full.
Nevertheless, I did find some inconsistency in their ability to release and removed them.
Again, I could be dead wrong!
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09-26-2018, 09:51 AM #25Senior Member
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And, by the way, if I am dead wrong I apologize!
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09-26-2018, 09:59 AM #26
I was curious, because I had never read the Wakemakers description of their valves. Interestingly, anti-siphoning via the vent is not listed as a possible application. They have an anti-siphoning loop for that, but you have to have room in your locker above the bag for those to work.
I'm going to have to take one apart when I get home to see how they're designed to work.2019 Supra SL450
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09-26-2018, 10:00 AM #27
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09-26-2018, 10:18 AM #28Senior Member
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09-26-2018, 10:24 AM #29
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09-26-2018, 10:57 AM #30
Could not put my hands on an actual Bosworth, even though im sure I have one here somewhere. I do have one that works on the same principal. 2 plastic halves with a rubber gasket between them, with a flapper cut about 90% around. No mechanical parts at all in them. They simply work when there is a back pressure against the flapper.
These flapper types can close under vacuum, closing off the sac vent while draining. However, over time and use, the flapper can get a little muscle memory so to speak, and hang slightly open. When this happens, a slight vacuum when draining, may not be enough to seat the valve, allowing air in to the sac.
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