What is the primary function of a reducing valve?

The primary function of a reducing valve is to maintain pressure. A reducing valve is designed to take a higher inlet pressure and reduce it to a lower outlet pressure that is appropriate for the system. This is crucial in plumbing and mechanical systems where consistent and controlled pressure is needed to protect pipes and fixtures from damage due to excessive pressure. Maintaining proper pressure ensures that water or gas flows effectively and safely, allowing for efficient operation of appliances and fixtures connected to the system.

In contrast, other functions listed—such as cutting off flow, allowing backflow, or filtering water—serve different purposes that are not associated with the primary role of a reducing valve. While some components in a system may perform those functions, the specific design of a reducing valve is focused on pressure regulation.