Where are the shutoff valves located on a pressure reducing valve (PRV)?

The placement of shutoff valves on a pressure reducing valve (PRV) is crucial for safe and efficient operation of a steam or hot water system. Having shutoff valves both before and after the PRV allows for comprehensive control over the system.

Shutoff valves located before the PRV enable isolation of the upstream supply line, allowing maintenance or replacement of the PRV without disrupting the entire system. This is essential for ensuring safety and compliance with operational procedures.

Meanwhile, having shutoff valves after the PRV allows for isolation of the downstream system. This ensures that maintenance can be performed on downstream equipment without having to depressurize the entire system. It enhances operational flexibility and safety, as technicians can work with confidence that the portion of the system they are working on is de-energized.

Therefore, the configuration of having shutoff valves both before and after the PRV provides a complete approach to system control and maintenance, making it the best practice for boiler and pressure system installations.