Yong Heng popped the pressure gauge

[powerline]

I recently (last week) got my Yong Heng compressor and its taken me a bit to gather all the necessary fittings etc to hook up to my Benjamin tank and FX Impact. I successfully filled the Benjamin 0-3200 and used the tank to top off my Impact. 

I went to top off the Benji tank and during the fill from the compressor I heard a "pop" like a cork gun.... not loud but noticeable over the noise of the compressor. I shut the compressor off and noticed the rubber plug on the gauge was missing and air was leaking out. 

During a check, I flipped the compressor back on and I can get the gauge to about 2000psi and then the noticeable hiss and escaping air comes out of the hole on the gauge. I've ordered a new gauge and figured to share my experience here while I wait. 

1) I wasn't aware there was a burst disc on the gauge....?

2) I'm trying to figure out what caused the problem.... Did I open the tank valve too soon before the compressor pressure was higher than the tank causing a back flow and over pressure....? Maybe I need a check valve in-line...?

Any thoughts and ideas are appreciated

 

[edosan]

Did you check the explosion proof disc?, this post might help

https://www.airgunnation.com/topic/yong-heng-compressor-tips-compilation/

Sorry, I re read your post and get that was the gauge the problem...mmm first time I heard about it...keep us posted! but probably a gauge failure (easy replace if is not the auto shut up one)

 

[sonny]

I believe we need to check all the bolts when new and fittings periodically to insure nothing has vibrated loose. The bolts holding pressure head to the block for lack of knowing what else to call it have vibrated loose on mine before.

 

[edosan]

That is a good tip @sonny I will add it to the compilation!

 

[dhill456]

Had the same thing happen to my pressure gauge. Took me a while to find the problem. I ordered a replacement gauge from either ebay or AliExpress. I plugged the hole with a metric bolt after I removed the defective gauge. I used the pressure gauge on my tank until I received a replacement gauge. I hope this will help.

 

[powerline]

Thanks for all the input. I gotta figure it was a faulty gauge because I rehearsed the fill procedures many times before actually going live with the fills. Also, I kinda don't think it was a back pressure issue since I don't think I was early opening my tank valve and I also figure the compressor check valve is downstream of the gauge (is this right?). Anyway I'm considering installing a check valve where I now have a "male-male" (this is still known as a gender changer right) foster fitting connecting my hoses, and this should work since both my tank and the compressor have bleed valves to decompress before disconnection.

All fittings and torqueable things have been checked and were tight.

Wasn't the burst disc but I did check it anyway and also learned how to remove the inner race holding the disc in place

Anyway, I ordered replacement(s) gauges from Aliexpress and I'll update once it arrives. Thanks dhill for the assurance it has happened to another besides me and for the advice of using a plug bolt as a temp. I kinda hesitate to do this since I believe the thread is NPT which means it's flared right? I'd do it if I was in a remote corner of Alaska and needed a fill to kill tonites meal....

 

[dhill456]

The threads on my gauge is M10*1 metric. That was the size of the bolt I used to plug it, until my replacement arrived.

 

[powerline]

dhill, you are correct. I just took a look at my gauge and it was not npt. As I incorrectly assumed. I'll be tearing this gauge apart to take a look inside......

 

[randy_68]

Had the same thing happen on mine . It would only go to 2000 psi th hen I could hear and feel air blowing out the back of the guage. I bought my replacement guage from pyramid air that had the right thread. Been working great . I overhauled it recently and it seems to run better than it ever did before.