The block I am refering to is if we had to remove a pipe spool and the only thing between the worker and the water was a butterfly valve. The potential is for injury if the butterfly shaft broke or disc slipped on the shaft the valve would fall open. Gate and knife valves if they fail (Shaft...
What is your experience with knife valves in municipal water pumping stations? Our safety committee wont let us use butterfly valves as a safe block of the energy. We would need to use 2 valves with a bleed between them. we are allowd to use a single gate valve that is locked out but 24" gate...
