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HelicopterEngines Plugs Mufflers Fuel › YS check valve - spring or no spring?
12-09-2008 09:59 PM  8 years agoPost 1
Liron alm.

rrApprentice

Israel

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Hi

i'm replumming my fuel tubes in my trex 700.
i needed to verify the YS check valve direction.
when i blow on one size, its extremly hard to pass though. on the other side, its impossible. i thought i had a faulty valve, so i took another one from my millennium and blow though it. it is very easy to pass through, and its impossible on the other side... hmm..
took both of them appart and found that the one that blow easly have no spring inside. i have to say that i used it like this for about two years with no problem.
so, the question is do i take off the spring or should i just leave it there, making it realy hard for gasses to pass through?

Liron

fly hard, land harder

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12-09-2008 10:27 PM  8 years agoPost 2
Ghostrider

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San Diego, CA

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There is a notch on the check valve to tell you which direction goes away or towards the back plate. The notch goes towards the back plate!

As far as blowing through it, that is NOT a good idea. There is a little diaphragm inside that can be damaged.

If it were me, I would replace the check valve with a new one and yes, you should have the spring in there.

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12-09-2008 11:16 PM  8 years agoPost 3
Dr.Ben

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Richmond, VA, USA

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The trip pressure for a YS check valve is quite high. It's always hard to blow through one. Sucking air through it is easier but tells you little about the valve's status. The side of the valve through which you cannot pass air at all goes towards the fuel tank.

Leave the spring in there.

Completely disassemble the check valve and flush all parts with alcohol. DRY all parts. Reassemble. It'll work fine.

Ben Minor

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12-09-2008 11:53 PM  8 years agoPost 4
dkshema

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Cedar Rapids, IA

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The YS check valve is simple. It has a plastic disk (not a diaphragm), and a spring. Blowing through it won't kill it.

It also comes apart easily for cleaning, or inspection.

Blow through it. One way will take some force to make it work the other way won't allow you to blow through at all.

The piece of hose on the end that allows you to blow through the valve is the end that goes to the backplate. The end that won't let you blow through the valve goes to the tank. Simple test and harmless.

It's a one-way check valve. It allows gases to pass in one direction, but not in the other. Think of it as a one-way clutch for air....

Without the spring, it won't do its job correctly.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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12-10-2008 06:39 AM  8 years agoPost 5
baby_zyklon

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Singapore

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Since we are on the topic of check valve, anyone notice that the white plastic piece in the check valve turns translucent and soften slightly after some usage? Is it normal if mine does that?

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12-10-2008 06:56 AM  8 years agoPost 6
Liron alm.

rrApprentice

Israel

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i think its actualy a silicon disk. it is natural for silicon to turn transparent

thanks for helping!
liron

fly hard, land harder

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04-16-2009 04:35 AM  8 years agoPost 7
Vance

rrVeteran

York ,PA

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OK- I'm bringing this up again.
I have two different check valves. One is short and just has a plastic disc in it(no spring).
The second one is longer & has a disc in it with a spring.
They both work correctly when blowing through them, however the one with the spring is def harder to blow through.
I see above the one with the spring is correct.
Is this a definite answer?
How long is the Correct check valve suppose to be?
I have a short one & a long one.
BTW - this is a YS80.
It has been sitting for a couple of years but I fired it up last weekend & it idles OK. It would die on spool up which would be indicative of a low pressure situation. Or maybe that is symptomatic of a faulty check valve?
I'm pretty sure I installed a new check valve before I layed it up a couple of years ago so that's why I'm questioning the "correct" check valve.
BTW- I replaced all the fuel lines.
Thanks
Vince D
BTW- Anyone know what the part number is for the correct check valve on a YS80?

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04-16-2009 04:52 AM  8 years agoPost 8
Vance

rrVeteran

York ,PA

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OK- I was doing some searching & found this post:

http://www.runryder.com/helicopter/...ght=check+valve

If you look at the post by Dr Ben( who knows his shyt ab YS motors), he says;
"The YS 4C and OS 140 check valves (same thing) will both work. They have no internals other than the silicone flapper - no springs, balls, etc."

So- Should they have a spring or not?
BTW- I have this one:

http://www.ronlund.com/Merchant2/me...uct_Code=YS2510
Thanks
Vince D

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04-16-2009 11:40 AM  8 years agoPost 9
Chuckie

rrKey Veteran

Crofton Maryland

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yes, you should have the spring in there.
Leave the spring in there.
Without the spring, it won't do its job correctly.

Please stand by for faster service!

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04-16-2009 02:06 PM  8 years agoPost 10
yoshgixxer

rrVeteran

york PA usa

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hey vince van deusch bag i have a y.s. check valve you can use to see if it fixes your antique craptor

dude..wheres my heli?????ama#902014

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04-16-2009 03:07 PM  8 years agoPost 11
baddynergy

rrElite Veteran

sierra madre, ca- usa

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OK. It would die on spool up which would be indicative of a low pressure situation. Or maybe that is symptomatic of a faulty check valve?
it is also indicative of an engine that needs to be tuned. And also you suck through the check valve not blow. If you can suck air its good.

**Unattended children will be givin a shot of espresso and a puppy**

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