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True. My valve was not faulty, but dirty inside. Cleaning it would have worked too.

The brass body can be "faulty". Pipes can corrode, this corrotion debris and other dirt can flow in the pipes and lodge in the brass part of the valve, which has a moving part inside. This is perfectly normal especially in older residences. The brass wont be damaged, but dirt, rust, corrosion...

My PRV was making loud creaking and drumming noises so much that I couldn't sleep. It turned out that debris built up in the valve. I took Jay1's advice but instead I replaced the entire valve. I used a different brand, Kwikot. The valve is now dead quite, even after using hot water, no noise. A...