en2015-08-18 17:38 PM CESThttp://inspire.ec.europa.eu/codelist/WaterAppurtenanceTypeValue/controlValve:1http://inspire.ec.europa.eu/codelist/WaterAppurtenanceTypeValue/controlValveControl valve.Control valves represent set of valves that operate in special ways. There are three fundamental types of control valves: backflow control, air control, and altitude.