How many shutoff valves must be installed on both sides of a pressure-reducing valve?

Two shutoff valves must be installed on both sides of a pressure-reducing valve to ensure proper functionality and maintenance. This requirement allows for isolation of the valve for servicing or replacement without disrupting the entire system. By having a shutoff valve on each side, technicians can effectively create a safe work environment, preventing the flow of fluid through the valve while repairs or adjustments are made. This is particularly important in systems where the pressure-reducing valve plays a critical role in managing system pressure, thereby ensuring safety and reliability in operation.

Having two valves allows you to isolate the valve itself, which is essential for both maintenance and emergency scenarios. It ensures that the downstream system can be maintained or serviced without affecting the upstream supply.