ASTM F1370-1992(2005) Standard Specification for Pressure-Reducing Valves for Water Systems Shipboard《船上给水系统用减压阀》.pdf

1、Designation: F 1370 92 (Reapproved 2005)An American National StandardStandard Specification forPressure-Reducing Valves for Water Systems, Shipboard1This standard is issued under the fixed designation F 1370; the number immediately following the designation indicates the year oforiginal adoption or,

2、 in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.

3、1 This specification covers self-contained, globe style,pressure-reducing valves for use in water systems of shipboardinstallations. These valves are limited to discharge pressuresettings of 200 psig (1379 kPa) and below.1.2 The values stated in inch-pound units are to be regardedas the standard. Th

4、e values given in parentheses are forinformation only.1.3 The following precautionary caveat pertains only to thetests portion, Section 8, of this specification: This standarddoes not purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user

5、of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2A 125 Specification for Steel Springs, Helical, Heat TreatedA 193/A 193M Specification for Alloy-Steel and StainlessSte

6、el Bolting Materials for High-Temperature ServiceA 194/A 194M Specification for Carbon and Alloy SteelNuts for Bolts for High-Pressure or High-TemperatureService, or BothA 231/A 231M Specification for Chromium-Vanadium Al-loy Steel Spring WireA 276 Specification for Stainless Steel Bars and ShapesA

7、313/A 313M Specification for Stainless Steel SpringWireA 689 Specification for Carbon and Alloy Steel Bars forSpringsB 21/B 21M Specification for Naval Brass, Rod, Bar, andShapesB 26/B 26M Specification for Aluminum-Alloy Sand Cast-ingsB61 Specification for Steam or Valve Bronze CastingsB62 Specific

8、ation for Composition Bronze or Ounce MetalCastingsB 148 Specification for Aluminum-Bronze Sand CastingsB 150/B 150M Specification for Aluminum Bronze Rod,Bar, and ShapesB 637 Specification for Precipitation Hardening Nickel Al-loy Bars, Forgings, and Forging Stock for High-Temperature ServiceB 689

9、Specification for Electroplated Engineering NickelCoatingsF 467 Specification for Nonferrous Nuts for General UseF 468 Specification for Nonferrous Bolts, Hex Cap Screws,and Studs for General UseF 593 Specification for Stainless Steel Bolts, Hex CapScrews, and StudsF 594 Specification for Stainless

10、Steel Nuts2.2 ANSI Standards:3ANSI B1.1 Unified Screw ThreadsANSI B1.12 Class 5 Interference, Fit Thread2.3 ISA Standards:4S75.01 Flow Equations for Sizing Control ValvesS75.02 Control Valve Capacity Test Procedure2.4 Federal Specifications:5QQ-B-637 Brass, Naval: Rod, Wire, Shapes, Forgings, andFla

11、t Products with Finished Edges (Bar, Flat Wire, andStrip)QQ-C-390 Copper Alloy Casting (Including Cast Bar)QQ-C-465 Copper-Aluminum Alloys (Aluminum Bronze)(Copper Alloy Numbers 606, 6014, 630, 632M, and 642);Rod, Flat Products with Finished Edges (Flat Wire, Strip,and Bar) Shapes, and ForgingsQQ-N-

12、281 Nickel-Copper Alloy Bar, Rod, Plate, Sheet,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 April 1, 2005. Published April 2005. Origin

13、allyapproved in 1992. Last previous edition aproved in 2003 as F 1370 92 (2003).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page

14、onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036.4Available from Instrumentation, Systems, and Automation Society, 67 Alex-ander Dr., Research Triangle Park, NC 27709.5Available from Standardization Documents Order Desk, DO

15、DSSP, Bldg. 4,Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.Strip, Wire, Forgings, and Structural and Special ShapedSectionsQQ-N-286 Nickel-Copper-Aluminum Alloy, Wrought(UNS

16、 N05500)QQ-N-288 Nickel-Copper Alloy and Nickel-CopperSiliconAlloy, CastingsQQ-S-763 Steel Bars, Wire, Shapes, and Forgings, Corro-sion ResistingQQ-S-766 Steel Corrosion Resisting Plate, Sheet and StripQQ-W-390 Wire, Nickel-Chromium-Iron AlloyTT-P-645 Primer Paint, Zinc Chromate, Alkyd Type2.5 Milit

17、ary Standards and Specifications:5MIL-V-3 Valves, Fittings, and Flanges (Except for SystemsIndicated Herein), Packaging ofMIL-S-901 Shock Tests, H.I. (High Impact), ShipboardMachinery, Equipment and Systems, Requirements forMIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,General Specification

18、 forDOD-P-15328 Primer (Wash), Pretreatment (Formula No.117 for Metals) (Metric)MIL-F-20042 Flanges, Pipe and Bulkhead, Bronze (SilverBrazing)MIL-C-20159 Copper-Nickel Alloy Casting (UNS No.C96200 and C96400)MIL-F-24227 Fittings and Flanges, Cast Bronze, SilverBrazing Suitable for Ultrasonic Inspect

19、ionMIL-B-24480 Bronze, Nickel-Aluminum (UNS No.C95800) Castings for Seawater ServiceMIL-S-81733 Sealing and Coating Compound, CorrosionInhibitiveMIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (Type IEnvironmental, and Type IIInternally Excited)MIL-STD-248 Welding and Brazing Procedure and

20、 Perfor-mance QualificationMIL-STD-278 Welding and Casting StandardMIL-STD-798 Non-destructive Testing, Welding, QualityControl, Material Control and Identification, and Hi-shockTest Requirements for Piping System Components forNaval Shipboard Use2.6 Other Publications:5Naval Sea Systems Command (NA

21、VSEA)2.7 Drawings:5803-1385946 Union Bronze, Silver Brazing WOG for UTInspection803-1385947 Flanges, Bronze, 700 PSI WOG for UT In-spection3. Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accuracy of regulationthe amount by which thedownstream pressure may vary when the valve i

22、s set at anypressure within the required set pressure limit and is subjectedto any combination of inlet pressure, flow demand, andambient temperature variations within the specified limits.3.1.2 design pressure and temperaturethe maximum pres-sure and temperature the valve should be subjected to und

23、erany condition; these are the pressure and temperature uponwhich the strength of the pressure-containing envelope isbased.3.1.3 hydrostatic proof test pressurethe maximum testpressure that the valve is required to withstand withoutdamage; valve operation is not required during application ofthis te

24、st pressure, but the valve must meet all performancerequirements after the pressure has been removed.3.1.4 lockup pressurethe outlet pressure delivered by apressure-reducing valve when the flow is reduced to zero;lockup pressure is always greater than set pressure, and inactual practice it may vary

25、with the specific valve design,tolerances, method of sensing downstream pressure, and pipingconfigurations.3.1.5 nominal pressurethe approximate maximum pres-sure to which the valve will be subjected in service undernormal conditions.3.1.6 set pressurethe downstream pressure that the valveis set to

26、maintain under a given set of operating conditions (thatis, inlet pressure and flow); the valve should ideally be set atdownstream pressure approximately equal to the midpoint ofthe set pressure limits (defined in 3.1.7).3.1.7 set pressure limits (set pressure adjustable range)the range of set press

27、ure over which the valve can be adjustedwhile meeting the specified performance requirements.4. Classification4.1 Valves shall be of the following types and pressureratings, as specified (see Section 5 and 6.1.21).4.1.1 Type IPressurized spring chamber, and4.1.2 Type IIUnpressurized spring chamber.4

28、.2 Pressure RatingsValves shall have nominal inlet pres-sure ratings of 150 or 250 psig (1034 or 1724 kPa), or asspecified (see 6.1.21).5. Ordering Information5.1 Ordering documentation for valves in accordance withthis specification shall include the following information, asrequired, to describe t

29、he equipment adequately.5.1.1 ASTM designation and year of issue,5.1.2 Valve specification code (see 6.1.21),5.1.3 Quantity of valves,5.1.4 Set pressure required,5.1.5 Set pressure limits, if not listed in 7.1.4,5.1.6 Face-to-face dimensions for valves, if not listed inTable 1,5.1.7 Regulation accur

30、acy required, if other than as given in7.1.5,5.1.8 When a choke feature is required (see 6.1.2),5.1.9 When tailpieces and nuts are required (see 6.1.15),5.1.10 Capacity requirement of valves, if not listed in Table2 (see 7.1.6), and5.1.11 Supplementary requirements, if any (see S1 throughS4).F 1370

31、92 (2005)26. Valve Construction and Coding6.1 Valves shall incorporate the design features specified in6.1.1 through 6.1.21.6.1.1 Materials of ConstructionMaterials shall be asspecified in Table 3. All materials shall be selected to preventcorrosion, galling, seizing, excessive wear, or erosion wher

32、eapplicable. Cadmium plating is prohibited.6.1.2 General RequirementsValves shall be self-contained, spring-loaded, direct-operated, pressure-reducingvalves incorporating a balanced valve element. Reduced pres-sure (not to exceed 200 psig (1379 kPa) shall be sensed by adiaphragm and compared with a

33、reference spring load. Anyforce imbalance shall be transmitted directly to and positivelyreposition a single-seated valve element to limit the set pointerror within the limits specified in 7.1.5. Type I valves shall bevalves in which the spring chamber in combination with thebody and bottom cap form

34、s a pressure-containing envelopecapable of withstanding the full hydrostatic proof test. Thesevalves shall be specified for special applications in which it isnecessary to contain the line media in the event of a failure thatsubjects the spring chamber to full inlet pressure. The springchamber assem

35、bly need not be leakproof; however, it shallcontain line media at hydrostatic proof test pressure withoutstructural failure and shall limit external leakage to a smallseepage (in drip form) past the adjusting screw threads andspring chamber joint. Type I valves shall also incorporate achoke feature

36、on the poppet to limit capacity in the event of adiaphragm failure, where specified (see Section 5). Type IIvalves shall be valves in which the spring chamber does notform part of the pressure-containing envelope.6.1.3 Pressure Envelope RatingThe nominal inlet (see3.1.5), design (see 3.1.2), and hyd

37、rostatic proof test (see 3.1.3)pressures for the pressure-containing envelope (body, springhousing, and bottom cap) shall be as specified in Table 4. Thedesign temperature (see 3.1.2) is also given in Table 4.6.1.4 Body PassagesBody passages shall produce gradualchanges in flow direction so as to re

38、duce any effects ofconcentrated impingement and 90 turns. In portions of thevalve subject to velocity increases and flow direction changes,such as immediately downstream of the seat, the 90 impinge-ment against the walls at close range shall be avoided. Thebody cavity downstream of the seat shall pr

39、esent a high angle(70 to 90) of incidence to the issuing jet. At points at whichdirect impingement at close range does occur and cannot beeliminated, the section thickness shall be increased substan-tially to provide adequate material to withstand the additionalerosive effect.6.1.5 Diaphragm Constru

40、ctionThe main diaphragm shallbe clamped between flanges on the body and spring chamber toensure a leaktight flange seal. The flange faces shall havesufficient width, and all edges in contact with the diaphragmshall be properly chamfered or rounded to prevent cutting orTABLE 1 Face-to-Face Dimensions

41、, in. (mm), 6116 (1.59)Size, in. (mm)Flanged End Union End Flanged End Union End150 psig(1034 kPa)250 psig(1724 kPa)150 and 250 psig(1034 and 1724kPa)400 psig(2758 kPa)700 psig(4826 kPa)400 psig(2758 kPa)700 psig(4826 kPa)0.25 (6.35) 714 778 7732 778 77320.37 (9.40) 714 (184) 778 (200) 7932 (185) 79

42、32 (185) 7932 (185)0.50 (12.7) 714 (184) 778 (200) 7932 (185) 612 (165) 612 (165) 7932 (185) 7932 (185)0.75 (19.05) 738 (187) 778 (200) 712 (191) 712 (191) 712 (191) 8 (203) 8 (203)1.00 (25.4) 738 (187) 8 (203) 712 (191) 812 (216) 812 (216) 834 (222) 834 (222)1.25 (31.75) 71516 (202) 81116 (221) 853

43、2 (207) 9 (229) 9 (229) 912 (241) 912 (241)1.50 (38.1) 834 (222) 912 (241) 83132 (228) 912 (241) 912 (241) 10 (254) 10 (254)2.00 (50.8) 10 (254) 1034 (273) 10732 (260) 1112 (292) 1112 (292) 1178 (302) 1178 (302)2.50 (63.5) 1078 (276) 1134 (298) 13 (330) 13 (330)3.00 (76.2) 1158 (295) 1212 (318) 14 (

44、356) 14 (356)3.50 (88.9) 1158 (295) 1258 (321)4.00 (101.6) 1312 (343) 1412 (368) 16 (406) 17 (432)TABLE 2 Minimum Required Valve Cvfor Types I and II, 150 and 250 psig (1034 and 1724 kPa) Rated Valves with 5 to 30 psig (34 to207 kPa), 25 to 60 psig (172 to 414 kPa), and 50 to 100 psig (345 to 689 kP

45、a) Set Pressure Adjustable RangesSize, in. (mm)5 to 30 psig (34 to 207 kPa)Set Pressure Adjustable Range25 to 60 (172 to 414 kPa) psigSet Pressure Adjustable Range50 to 100 psig (345 to 689 kPa)Set Pressure Adjustable RangeSet Pressure, psig (kPa)10 (69) 20 (138) 30 (207) 30 (207) 45 (310) 60 (414)

46、60 (414) 80 (552) 100 (689)0.25 (6.35) 0.7 0.9 1.0 0.6 0.7 0.9 0.5 0.6 0.70.37 (9.40) 1.4 1.8 2.0 1.2 1.4 1.8 1.0 1.2 1.40.50 (12.70) 2.5 3 3.5 2 2.5 3 1.5 2.0 2.50.75 (19.05) 3 3.5 4 2.5 3 3.5 2.0 2.5 3.01.0(25.40) 4563452.63.4.01.25 (31.75) 5.5 7.5 9 5 7 8.5 3.5 4.5 5.51.50 (38.10) 7 10 12 6.5 9.5

47、 11.5 5.0 6.0 7.02.00 (50.80) 15 20 25 12 17 22 11 13 152.50 (63.50) 30 35 40 25 30 35 24 27 303.00 (76.20) 45 50 55 40 45 50 35 40 453.50 (88.90) 55 60 65 50 55 60 45 50 554.00 (101.60) 70 75 80 65 70 75 60 65 70F 1370 92 (2005)3tearing of the diaphragm. The valve and diaphragm shallwithstand a pre

48、ssure differential across the diaphragm of twicethe highest set pressure or 200 psig (1379 kPa), whichever isgreater, for Type I valves. For Type II valves, this pressuredifferential shall be as follows: For valves of sizes up to 2 in.(50.8 mm), it shall be twice the highest set pressure or 375 psig

49、(2586 kPa), whichever is greater; for valves of sizes over 2 in.(50.8 mm), it shall be twice the highest set pressure or 300 psig(2068 kPa), whichever is greater. There shall be no damage ordegradation to the performance capabilities of either the valveinternals or the diaphragm. However, in no case shall thediaphragm be required to withstand a pressure differentialgreater than the nominal inlet pressure rating of the valve.6.1.6 Valving Element ConstructionThe stem shall be ofone-piece construction and be t