Yong Heng compressor what am i doing wrong

[jackcramerr]

Has anyone used this compressor?
Each time I fill cylinder (200 bar), when I try to remove the cylinder (un screw) it damages the threads of cylinder as it hold it under pressure. Am I using it wrong? Or do I need a relief valve or something installed?

If I unscrew the black knob, it drains air from the cylinder.



The cylinder I use comes from Hammerli AP40. Picture attached.



There is no valve between the cylinder and this compressor. I have a coupling between the compressor filter holder and an adapter. The coupling then connects to an adapter that connects to the cylinder. Picture of the coupling attached.


Picture of the adapter. The cylinder fits to this.

r

 

[cavedweller]

Has anyone used this compressor?
Each time I fill cylinder (200 bar), when I try to remove the cylinder (un screw) it damages the threads of cylinder as it hold it under pressure. Am I using it wrong? Or do I need a relief valve or something installed?

If I unscrew the black knob, it drains air from the cylinder.
View attachment 444453


The cylinder I use comes from Hammerli AP40. Picture attached.
View attachment 444454
View attachment 444455

There is no valve between the cylinder and this compressor. I have a coupling between the compressor filter holder and an adapter. The coupling then connects to an adapter that connects to the cylinder. Picture of the coupling attached.
View attachment 444457

Picture of the adapter. The cylinder fits to this.

rView attachment 444458

Try bleeding the drain line before disconnecting

 

[jackcramerr]

Try bleeding the drain line before disconnecting

How can I do that?

 

[RM.510bigbore]

The black screw moves separate. Once you do.it its pretty simple.

 

[jackcramerr]

The black screw moves separate. Once you do.it its pretty simple.

Sorry I am not able to follow. You mean the black knob shown in the picture?
If I unscrew that, all the air from the cylinder comes out.

 

[Ca_Varminter]

You probably need to unscrew the Cylinder between 3/4-1 1/2 turns..
This is to allow the cylinder valve to seal... Then you can bleed the compressor air..
Now the cylinder should unscrew easily.....

 

[Vetmx]

If you don’t have a valve that stops the air from escaping the cylinder, you can’t bleed the line with the black knob.

 

[WoodWelder]

The check valve on the Hammerli tank not working?

 

[RM.510bigbore]

Sorry I am not able to follow. You mean the black knob shown in the picture?
If I unscrew that, all the air from the cylinder comes out.

You probably need a bleeder in your Valve adapter.. I'm guessing.. All.of.my scba attachment s have a air bleeder in them..

 

[WoodWelder]

Try filling the rifle cocked?

 

[jackcramerr]

If you don’t have a valve that stops the air from escaping the cylinder, you can’t bleed the line with the black knob.

Is that something I need to buy?

 

[Vetmx]

Is that something I need to buy?

I know nothing about a Hammerli, so someone more knowledgeable will have to help you.

 

[jackcramerr]

The check valve on the Hammerli tank not working?

The adapter I use (silver) came with this gun. If that is connected to the cylinder, it will empty it. I think that is by the design so cylinder can be emptied for transportation. This is a competition weapon and thus carried on flights.

Since I have this connected inline to the compressor, the check valve on the hammerli cylinder will not work.

 

[jackcramerr]

You probably need a bleeder in your Valve adapter.. I'm guessing.. All.of.my scba attachment s have a air bleeder in them..

Any examples? So I get an idea of what I should be looking at. Am two new to this.

 

[WoodWelder]

Did you purchase the air compressor and gun at the same time?

Have you filled the gun and used it in the past?

 

[jackcramerr]

You probably need to unscrew the Cylinder between 3/4-1 1/2 turns..
This is to allow the cylinder valve to seal... Then you can bleed the compressor air..
Now the cylinder should unscrew easily.....

I will try this. But it gets very tight at 200bar and I imagine that is when I am damaging the cylinder. They aren't cheap hence the concern.

 

[jackcramerr]

Did you purchase the air compressor and gun at the same time?

Have you filled the gun and used it in the past?

No. Separately. Actually compressor was given away to me. I used to use the mechanical pump. No issues with that.
I connect the silver adapter that came with the air pistol to the mechanical pump and then connect the cylinder.

 

[RM.510bigbore]

This both have breeders inline...examples my stuff is CGA-347 for scba tanks...

 

[Ca_Varminter]

Yes, it will be tight..... with 200 bar of air behind it
But you are only doing 3/4 to 1 1/2 turn on that cylinder..
It is the same on my Steyr LP50 cylinders.....

 

[Gerry52]

One should NEVER have to unscrew stuff under pressure. Sounds to me like check valve in CYLINDER is not working to keep air from escaping. Have you tried a SMALL drop of silicone in cylinder air fitting before connecting compressor line?