Air Venturi Noise During Pump

[Jalan]

Hello All,
I have a new Air Venturi Avenger 25 Bullpup (2nd Generation). I'm new to the sport and still pretty green regarding the guns themselves.
I'm charging it with a budget compressor (Vevor) but it's working fine. From the first time I just notice as it's pumping, there's a faint chirping noise from the gun itself. A very consistent regular time chirp....chirp.....chirp. pretty much in time with the compressor.
I'm guessing it's normal. There's no sound after filing. No signs of any leaking. Maybe a check valve or regulator equalizing?
Oh well, although there seems to be no issue, it's worth asking the question.
Thanks All ..

 

[nervoustrig]

My standard Avenger makes a conspicuous squeak on each pump stroke when filling from a hand pump, so I suspect what you are hearing is normal.

Side note, the check valve on mine started leaking a few weeks ago, and when I repaired it I swapped the check valve ball to a stem type and discarded the spring. Your question made me realize I haven’t noticed the squeak recently. Not sure if that eliminated it or I simply became desensitized to it. I’ll have to check.

 

[Cam Armstrong]

That would be the one way check valve, that's fairly common. If it's holding air don't worry about.

 

[nervoustrig]

Quick update just to say I rechecked to see if the squeak disappeared after having reconfigured the check valve, and indeed it is gone.