?? The pvc/pex cracked and blew the valve off? Just cracked and blew the knob off?? the post is rather cryptic. If some section of pipe an/or valve broke, seems like a quick trip to Lowes or HD to get the required replacement parts (pipe, unions, knobs) and 30 minutes should put you back in business. If it's pex, you'll need a crimp tool, or spend the money and get sharkbite fittings.
If plumbing is not something you are comfortable with , call a plumber or see if there is a guy at the CG you are in that can help.