by 2in2out on Mon Mar 05, 2018 7:28 pm
When I was a firefighter, one of my main jobs was engineer. The old-timers never used pressure relief valves, because they didn't understand pump operations. As long as water went in to the pump and came out in the correct direction, that was all they needed. When I started running pumps, I discovered that all of the pressure relief valves were seized due to rust and not being used. I tried to work them free, but gave up in the end.
The new trucks are all electronic and that obsoleted the need to use those valves.
Adjustable gas blocks are not quite the same thing as fire pump pressure relief valves, but my point was, a lot of people set it, leave it that way and manage to get away with it (me included).
"...the liberties of the American people were dependent upon the ballot-box, the jury-box, and the cartridge-box; that without these no class of people could live and flourish in this country..." ---Frederick Douglass