Huma inline regulator problem

I put a pressuregauge on my airtank this morning.

when I was about to bleed the hose. It bled for 2 seconds and then it stopped instantly. Sounded like something blocked the bleeding hole.

the pressure gauge indicates that there is about 230bar on the filling line. 

So my question is how do I bleed the pressure?

anyone who has experienced the same?

hope for a quick answer

thank you



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