CSLB Class B General Contractor's License Practice Exam

What is the primary purpose of installing a pressure reducing valve in a plumbing system?

1. To prevent leaks in pipes

2. To reduce varying pressure from the city supply

3. To increase water flow rates

4. To save energy costs

The correct answer is: To reduce varying pressure from the city supply

The primary purpose of installing a pressure reducing valve in a plumbing system is to mitigate the issues associated with high water pressure from the municipal supply. Excessive pressure can lead to a variety of plumbing problems, including damage to pipes, fixtures, and appliances, as well as increased wear and tear on the entire plumbing system. By reducing the incoming pressure to a safer, more manageable level, a pressure reducing valve helps ensure that the system operates efficiently and prolongs the lifespan of plumbing components. In addition, this regulation of pressure contributes to a more stable flow within the system and minimizes the risk of leaks or bursts due to pressure spikes. It also promotes consistent performance of fixtures, ensuring that devices like faucets and showers deliver water at a comfortable and effective rate without the negative effects associated with high pressure. Thus, the installation of a pressure reducing valve plays a critical role in maintaining both functionality and safety within residential and commercial plumbing systems.