The answer to 'how to maintain pressure regulator' is to regularly inspect and service the pressure regulator in your home's plumbing system. A pressure regulator is a device that controls the water pressure coming into your home, ensuring it doesn't exceed a safe level and cause damage to your pipes and fixtures.
To maintain your pressure regulator, you should check it every 1-2 years for proper operation. This involves shutting off the water supply, unscrewing the regulator, and inspecting the internal components for wear or damage. You may need to replace washers, springs, or the entire regulator if it's not functioning properly. Be sure to follow the manufacturer's instructions carefully when servicing the regulator. If you're not comfortable doing this yourself, it's best to hire a licensed plumber to handle the maintenance for you.