1、Refinery Valves and Accessories for Control and Safety Instrumented SystemsAPI RECOMMENDED PRACTICE 553 SECOND EDITION,OCTOBER 2012Refinery Valves and Accessories for Control and Safety Instrumented SystemsDownstream SegmentAPI RECOMMENDED PRACTICE 553 SECOND EDITION,OCTOBER 2012Special NotesAPI pub
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15、ld be submitted to the Standards Department,API,1220 L Street,NW,Washington,DC 20005,standardsapi.org.iiiContentsPage1Scope.12Normative References.13Terms and Definitions.34Control Valves.84.1General.84.2Valve Body.84.3Valve Actuators.234.4Valve Positioner .274.5Handwheels.294.6Switches and Solenoid
16、s .304.7Volume Boosters/Quick Exhaust Vents/Air Locks.315Specific Criteria .325.1Globe-Style Valves .325.2Rotary Style Valves.335.3Specialty ValvesHigh Pressure Drop and Particle Applications.355.4 Control Valve Performance .365.5High Performance Control Valves .385.6Material Considerations for Control Valves in Refining Processes.396Installation/Inspection/Testing .436.1 Accessibility.436.2 Location.436.3Control Valve Manifolds.456.4 Inspection and Testing.457Refinery Applications.477.1Introduc
