Rhode Island Journeyman Plumber Practice Exam

What is the function of a pressure reducing valve (PRV)?

1. Increase water pressure

2. Regulate water flow

3. Decrease water pressure

4. Prevent backflow

The correct answer is: Decrease water pressure

The function of a pressure reducing valve (PRV) is to decrease water pressure. A PRV is specifically designed to reduce the high inlet pressure from a water supply system to a lower, more manageable pressure for the plumbing system. This is crucial in preventing damage to plumbing fixtures and appliances that may not withstand high pressure. By regulating the pressure, the PRV ensures a consistent and safe level of pressure throughout the system, which helps to maintain the integrity of pipes and fixtures. High water pressure can lead to leaks, bursts, or excessive wear on components, which is why a PRV is an essential device in many plumbing systems. Other options address different functionalities; increasing pressure is not the role of a PRV, and while regulating water flow can be a function of other devices, it is not the primary role of a PRV. The prevention of backflow is managed by a separate type of valve designed for that specific purpose. Therefore, recognizing the distinct role of a PRV in managing water pressure is key to understanding its importance in plumbing systems.