The proper way to handle the situation is not difficult. You will need to return an attached threaded pipe to the union and simply connect the loosely threaded pipe to your Ball Valve. After this you have to reassemble the pipe and valve to the hanging pipe. When this is done the next step is reconnecting this union to the other side of the system. You will also need two HD pipe wrenches. These are used at the same time to break the union and eventually retighten it after the brass Ball Valve was replaced with a new one.

The real problem with this scenario is that the brass ball valve cracks. This is most likely because of it getting frozen. As time passes you will end up having to replace the 3/4 inch brass Ball Valve every year as it will always crack unless you can have a way to drain the entire line at the end of summer. The best solution would be to move it into a heated portion of your home or somewhere where it is hot and it can be turned off in order for the line to be drained.

More products of valves

Check Valves

Gate Valves

Butterfly Valves

Globe Valves

Safety valves