Steamfitter Certificate of Qualification (CFQ) Practice Exam 2025 – All-in-One Resource to Ensure Exam Success!

Setting a higher pressure in a pressure reducing valve for residential service typically follows the guideline of maintaining a residual pressure of 4 psig at the highest point in the system. This approach ensures that there is sufficient pressure available to adequately supply water or gas to fixtures and appliances located at elevated levels, such as upper floors of a building. By maintaining 4 psig at the highest point, it helps prevent issues like inadequate flow or pressure drops, which could result in appliances not functioning properly or water not reaching upper fixtures effectively.

This rule of thumb balances the need for adequate pressure throughout the system while also protecting the entire plumbing setup from potential problems related to higher pressures that could lead to leaks or stresses on the piping.