when I use a pump tester to test the check valve?I connected from black side it can hold up pressure but when I connected from green side it can't hold up pressure.Is it right? The green direction is connect to pressure chamber that means without air to my pressure chamber now???sould I connect black side to pressure chamber??

 

That valve should flow air in the direction of the arrow. Which means it should not hold pressure on the left nipple, but it should hold pressure on the right nipple.

The results shown in the photo say it's a bad check valve.

Dave

 

If my eyes aren't playing tricks on me the gauge looks to be a vacuum reading. If that is the case the check valve should be ok since the other side(green) does not hold vacuum.

As far as which end goes where I always refer to the vacuum diagrams which I know is on the forum somewhere.

gary

 

Just sit and think about it for a second... it's not that complicated. Air should only flow in direction of arrow. All you need to do to check a check valve is to try to blow through it.

 

Aw jeez, I see it too now!

It should hold to 30inHg, which is equivalent to 15psi. But like Alex said simply blowing through it is usually enough.

Dave

 

I agree much simpler test. I think that's how I checked mine last time.

I was just trying to explain what he had observed with the vacuum pump.

mattchan6668
heres a link to a nice vac diagram.
http://www.wrex-racing.com/docs/fd/v...se_diagram.jpg

Should tell you exactly how to orient the check valve.

gary