SY5000, Pilot Air Control Valves

Pilot air control valves are used to split a manifold into separate pneumatically controlled zones.  The pilot air control valve controls the pilot air supply for the downstream valves up to the next zone.  The zone is taken in/out of service by energizing/de-energizing the control valve.  Splitting a manifold into zones can permit a single zone to be switched off for maintenance or due to a safety fault while the remaining valves remain operational.