The water pressure regulator in my 30 year old town home was replaced about 10-12 years ago. Recently I've noticed a drop in water pressure as well as sometimes "banging pipes" when two or more sources are used at the same time (such as shower and laundry). I have a pressure gauge and the adjustment screw on the regulator does not reduce pressure (ahead of or after the regulator reads 140# with everything closed). Can this be caused by a dirty/clogged filter or screen in the regulator? I hate to spend $100+ for another new regulator if mine can be cleaned or repaired. And it seems wasteful to toss out all that brass in my regulator if there is a simple fix with a spring or screen.

Many thanks if you can offer suggestions.