Check the valve flange fitting with a plug point or other devices. Installed correctly, there are no leakage point and ground connection has been made with all the points.
Check the valve fitting flange connections or other devices. Installed correctly, there is no point of leakage. And are connected to the ground every point.
Check the flange joint fitting with valve or other device, installation is correct, no leaks locating The grounding element connected with every point.