Cla-Val UL Listed/MEA Approved 90-21 Pressure Reducing Valves play a key role in onshore and offshore fire protection and are commonly installed on the discharge of a fire pump or in sprinkler systems to maintain constant downstream pressure, regardless of flow. Cla-Val University Training Manager, George Aguilar, demonstrates everything you need for successful operation, start-up, adjustment, service, and maintenance of this essential valve.