ASTM_F_1985_-_99_2011.pdf

Designation:F198599(Reapproved 2011)An American National StandardStandard Specification forPneumatic-Operated,Globe-Style,Control Valves1This standard is issued under the fixed designation F1985;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers the design,construction,test-ing,and operating requirements for pneumatic-operated,globe-style,control valves complete with actuators for various fluidsystems(steam,gas,and liquid applications).The controlvalves with actuators may be procured under this specificationcomplete with all associated pneumatic instrumentation neces-sary for the valve to function in the system application;however,complete and detailed requirements for air instru-mentation are beyond the scope of this specification and thusare not included here.This specification is not intended tocover quarter-turn or multi-turn stem valves.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 The most recent edition or revision of the followingstandards or specifications shall,to the extent specified in thisspecification,form a part of this specification.2.2 ASME Standards:2B1.1 Unified Screw Threads(UN and UNR Thread Form)B1.20.1 Pipe Threads,General Purpose(Inch)B16.1 Cast Iron Pipe Flanges and Flanged Fittings,Class 25,125,250 and 800B16.5 Pipe Flanges and Flanged FittingsB16.11 Forged Steel Fittings,Socket-Welding and ThreadedB16.25 Buttwelding EndsB16.24 Bronze Pipe Flanges and Flanged fittings,Class 150and 300B16.34 Valves-Flanged and Buttwelding End Steel,NickelAlloy,and Other Special Allows2.3 Manufacturers Standardization Society of the Valve andFitting Industry:3MSS SP-25 Standard Marking System for Valves,Fittings,Flanges and Unions2.4 Fluid Controls Institute Standard:4FCI 70-2 Control Valve Seat Leakage2.5 Military Standards and Specifications:5MIL-STD-798 Nondestructive Testing,Welding QualityControl Material Control and Identification and Hi-ShockTest Requirements for Piping System Components forNaval Ship UseMIL-S-901 Shock Tests,H.I.(High Impact);ShipboardMachinery,Equipment and Systems,Requirements forMIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment(Type I Environmental and Type II Inter-nally Excited)MS-16142 Boss Gasket-Seal Straight Thread Tube Fitting,Standard Dimensions forMIL-F-1183 Fittings,Pipe,Cast Bronze,Silver Brazing,General Specification forMIL-F-20042 Flanges,Pipe and Bulkhead,Bronze(SilverBrazing)2.6 Government Drawings and Publications:Naval Sea Systems Command(NAVSEA):5803-1385946 Unions,Bronze,Silver Brazing Alloy.ForWater,Oil,and Gas803-1385943 Unions,Silver Brazing,3000 lb/in.2,WOG,NPS,for UT Inspection803-1385884 Unions,Butt and Socket Welding,6000 lb/in.2WOG,NPS,For UT Inspections2.7 ISA Standard:6ISA-S75.05 Standard for Control Valve Terminology3.Terminology3.1 Definitions of Terms Specific to This Standard:1This specification is under the jurisdiction of ASTM committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved Nov.1,2011.Published November 2011.Originallyapproved in 1999.Last previous edition approved in 2005 as F1985 99(2005).DOI:10.1520/F1985-99R11.2Available from American Society of Mechanical Engineers(ASME),ASMEInternational Headquarters,Three Park Ave.,New York,NY 10016-5990,http:/www.asme.org.3Available from Manufacturers Standardization Society of the Valve and FittingsIndustry(MSS),127 Park St.,NE,Vienna,VA 22180-4602,http:/www.mss-.4Available from Fluid Controls Institute,1300 Sumner Ave.,Cleveland,OH44115.5Available from U.S.Government Printing Office Superintendent of Documents,732 N.Capitol St.,NW,Mail Stop:SDE,Washington,DC 20401,http:/www.access.gpo.gov.6Available from International Society for Measurement and Control,67 Alex-ander Dr.,PO Box 12277,Research Triangle Park,NC 27709.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.1 actuatorthe unit that converts a pneumatic pressuresignal into a force to position the valve plug.3.1.2 bonnetthe upper portion of the valve body subas-sembly to which the yoke attaches.The bonnet contains thevalve stem packing.3.1.3 dead bandthe range through which input signal canbe varied,upon reversal of direction,without an observablechange in the value stem position.3.1.4 equal-percentage openingan equal-percentage flowcharacteristic of a control valve provides a change in flow,withthe change in valve lift,that is a constant percentage of the flowbefore the change was made.3.1.5 flow coeffcient(CV)A basic capacity rating forvalves that relates flow rate to the inlet and outle