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Old 05-02-2010, 12:07 AM   #1
project67-stepside
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smc valves wtf!!!!!!

just got the front bags in and decided to check the valves, hooked an air hose up to them and they bleed back through the valves, there hooked up right, valves are new, wtf... i cant proceed on the valves, tanks and the pumps i dont get it hellllllllllllllllllllllllllllllppppppppppppppppppp.....
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Old 05-02-2010, 12:57 AM   #2
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Re: smc valves wtf!!!!!!

Sounds like you were forcing air through the valve backwards which it will bleed through.
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Old 05-02-2010, 01:00 AM   #3
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Re: smc valves wtf!!!!!!

Also, if you dont have check valves and you have low or no tank pressure the bag pressure will bleed back into the tank until it equalizes.
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Old 05-02-2010, 11:17 AM   #4
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Re: smc valves wtf!!!!!!

^^right on
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Old 05-11-2010, 02:37 PM   #5
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Re: smc valves wtf!!!!!!

Quote:
Originally Posted by Thorbecke Bros. View Post
Also, if you dont have check valves and you have low or no tank pressure the bag pressure will bleed back into the tank until it equalizes.
Exactly. Most valves require a minimum pressure on the back side to keep the valve closed.
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Old 05-11-2010, 05:17 PM   #6
michael bustamante
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Re: smc valves wtf!!!!!!

where do you install the check valves then? just before the the fill valve?
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Old 05-11-2010, 05:44 PM   #7
BACKYARD88
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Re: smc valves wtf!!!!!!

I only used check valves when I ran Nitrogen(so I didn't have to lay the truck out to change the bottle). But yes, they would need to be before the fill valve. Once you get the tank and pumps installed they should be fine without check valves. I think the minimum PSI is only around 3-5 to hold the valves closed so as long as you keep that much in the tank they're fine. If you have Viair pumps they have a check valve built in to the leader.
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Old 05-11-2010, 05:59 PM   #8
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Re: smc valves wtf!!!!!!

""If you have Viair pumps they have a check valve built in to the leader.""

I was just going to say the same thing..
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Old 05-11-2010, 06:11 PM   #9
michael bustamante
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Re: smc valves wtf!!!!!!

nope, running a thomas (thompson?) pump no check valve but Im still building the system, so there shouldnt be any pressure backfeeding thru the valves if I have them plumbed right then correct?
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Old 05-11-2010, 06:16 PM   #10
kev2809
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Re: smc valves wtf!!!!!!

a new leader hose from suicidedoors comes with a built in check valve. thats what i bought..
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Old 05-11-2010, 06:18 PM   #11
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Re: smc valves wtf!!!!!!

Quote:
Originally Posted by michael bustamante View Post
nope, running a thomas (thompson?) pump no check valve but Im still building the system, so there shouldnt be any pressure backfeeding thru the valves if I have them plumbed right then correct?
Correct. Just put a check valve between the pump and tank and you should be good to go.
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Old 05-11-2010, 06:32 PM   #12
michael bustamante
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Re: smc valves wtf!!!!!!

good deal, thanks, I didnt mean to steal the thread!!!!
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Old 05-11-2010, 09:23 PM   #13
project67-stepside
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Re: smc valves wtf!!!!!!

Thanks guys i appreciate all the info>>>>>>>
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