Acetylene generator water filling valve replacement experience

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Since we are using a straight-through single seat and the water added is press filter water, the valve seat packing is damaged and a large amount of water leaks from the valve stem! For safety reasons, replace the valve with a new one! When replacing the valves, it is necessary to close the front and rear hand valves. However, since the pipeline has been using pressurized filtered water for a long time, thick dirt has long formed in the pipe wall. In addition, the hand valves are butterfly valves, so the sealing performance is poor. Now it is very lively, but when the valve is removed, the acetylene station becomes a "water curtain hole"! In the end, I had no choice but to stop the pump briefly and reinstall the old valve. However, a large amount of water had entered the positioner, so I replaced it with a new positioner. It was really not worth the loss. It seemed that the replacement of the new valve could only wait until the machine was stopped! I hope all my friends will learn from this after seeing it. I also want to ask, what valve did you choose at this position? ? ? Also, what kind of water was used? ? ? ?