2 Royalty-Free Audio Tracks for "Boiler Valve"

Safety valve opening and releasing steam when boiler goes high pressure. Industrial 1000 hp boiler. Recorded on a s9 samsung phone.

Recorded with zoom h2n, 4ch mode, some post production with noise cancelling and merge of all tracks into a stereo one due to a problem with my zoom unit. Old methane gas boiler for heating independent apartments. The boiler is one of those models with an open combustion chamber, year 2000 or 2002.