I am new to welding and had a few safety questions. I have only started with Oxy-Acetylene basics.

In my book it says to not open the tank valves too quickly because this can cause damage to the regulator. Can it cause damage even when the T-valve is uncompressed (it would read at 0 psi with an uncompressed T-valve even with the tank open)?

At my station, I unintentionally let the acetylene go from 5 psi to 20 psi by re-opening the tank valve after closing it. Then I immediately turned the acetylene valve off, the bled the line. Could I possibly have damaged my regulator by doing this? I read that acetylene is unstable at above 25 psi and can self-ignite from its own heat under pressure. Could excess heat and pressure have damaged the regulator? Thanks.