Anybody know Victor flowmeters?
 

The flowmeter I'm curious about, the HRV2380, has inside it a device
called a "cartridge". This is apparently the problem with my meter.
The cartridge has a sintered metal filter in one end and the other end
has a small hole with a stiff wire protruding. Pressing on the wire
allows more gas to flow. The one I have flows gas even when there is
nothing pressing on the wire. So there must be something inside the
cartridge that prevents a valve from closing all the way. Anybody here
know what is inside these things? I'm probably going to take mine
apart when the new part arrives but I am impatient and want to know
now. But I don't want to take it apart until the new one arrives just
in case I need to fix the one I have.
Eric