1、Designation: F 1794 97 (Reapproved 2004)An American National StandardStandard Specification forHand-Operated, Globe-Style Valves for Gas (Except OxygenGas) and Hydraulic Systems1This standard is issued under the fixed designation F 1794; the number immediately following the designation indicates the
2、 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 (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This specification covers the design, construction
3、, test-ing, and operating requirements for hand-operated, quick-change cartridge trim, in-line body and angle-body, globe-stylevalves for use in gas (except oxygen gas) and hydraulicsystems. These valves may be used for on-off, and/or throttlingapplications.1.2 The values stated in this specificatio
4、n in inch-poundunits are to be regarded as the standard. The SI equivalentsshown in parenthesis are provided for information only.2. Referenced Documents2.1 ASTM Standards:2F 992 Specification for Valve Label Plates2.2 American National Standards Institute (ANSI):3B1.1 Unified Screw Threads (UN and
5、UNR Thread Form)B1.20.1 Pipe Threads, General Purpose (Inch)B16.11 Forged Steel Fittings, Socket-Welding and ThreadedB16.25 Buttwelding EndsB16.34 ValvesFlanged, Threaded, and Welded End2.3 Military Standards and Specifications:4MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (Type IEnviro
6、nmental and Type IIInternally Excited)MIL-STD-740-1 Airborne Noise Measurements and Accep-tance Criteria of Shipboard EquipmentMIL-S-901 Shock Tests, H.I. (High-Impact); ShipboardMachinery, Equipment and Systems, Requirements forMIL-F-1183 Fittings, Pipe, Cast Bronze, Silver-Brazing,General Specific
7、ation for2.4 Government Drawings:Naval Sea Systems Command (NAVSEA):NAVSEA 803-1385884 Unions, Fittings and Adapters Buttand Socket Welding 6000 PSI, WOG, NPSNAVSEA 803-1385943 Unions, Silver Brazing 3000 PSI,WOG, NPS, for UT InspectionNAVSEA 803-1385946 Unions, Bronze Silver Brazing,WOG for UT Insp
8、ection3. Terminology3.1 Definitions:3.1.1 bubble-tightno visible leakage over a 3-min periodusing either water submersion or the application of bubble fluidfor detection.3.1.2 external leakageleakage from the valve that escapesto atmosphere.3.1.3 flow capacitythe ability of a valve to pass flowunder
9、 any given set of pressure conditions. The flow capacityof a valve is directly related to its Flow Coefficient (Cv). TheFlow coefficient is the quantity of water passing through avalve, expressed in gallons/minute (litres/minute), when 1 psi(6.895 kPa) pressure drop at 60F (16C) is applied across th
10、evalve.3.1.4 globe-style valvesa basic control valve type thatgets its name from the globular shape of its body with aninternal bridgewall construction. It normally uses a basic risingstem/plug for the closure member.3.1.5 hydrostatic shell test pressuresthe hydrostatic testpressures that the valve
11、is required to withstand withoutdamage. Valve operation is not required during application ofshell test pressure, but the valve must meet all performancerequirements after the shell test pressure has been removed.3.1.6 internal leakageleakage from higher pressure tolower pressure portions of the val
12、ve.3.1.7 operating pressuresthe pressures within the valveduring service.3.1.8 pressure ratingsthe pressure ratings of the valveshall be as defined in the documents listed in Table 1. Thepressure ratings (also called pressure-temperature ratings)1This specification is under the jurisdiction of ASTM
13、Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2004. Published May 2004. Originallyapproved in 1997. Last previous edition approved in 1997 as F 1794 - 97.2For referenced ASTM standard
14、s, 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 onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, Ne
15、w York, NY 10036.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philadelphia, PA 19111-5094, Attn: NPODS.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.establish the maximum allowable worki
16、ng (service) pressuresof a component (valve, end connections, and so forth) atvarious temperatures.3.1.9 quick-change cartridge trima construction that fa-cilitates rapid and reliable seat-ring/seat removal and replace-ment by retaining the seat-ring/seat in the valve cartridge, asopposed to a seat-
17、ring which is threaded, welded, brazed, ormade integral with the valve body.3.1.10 seat tightnessthe ability of a valve to preventinternal leakage from the valve-inlet to the valve-outlet.4. Classification4.1 Valves shall be of the following types, styles, sizes,pressure ratings, and end connections
18、, as specified in Section 5.4.1.1 TypesValves shall have either Type I (angle bodyconstruction) or Type II (inline body construction).4.1.2 StylesValves shall be either Style I (shut-off valves)or Style 2 (throttling valves).4.1.3 SizesValve sizes shall be18 NPS (10.2 mm),14 NPS(13.5 mm),38 NPS (17.
19、2 mm),12 NPS (21.3 mm),34 NPS(26.9 mm), 1 NPS (33.7 mm), 114 NPS (42.4 mm), 112 NPS(48.3 mm), and 2 NPS (60.3 mm).4.1.4 Pressure RatingsValves shall have a pressure ratingselected from those listed in Table 1 and specified in Section 5.The inlet and outlet pressure ratings of the valve shall beident
20、ical for any given valve.4.1.5 End ConnectionsValves shall have end connectionsselected from those listed in Table 1 and specified in Section 5.The inlet and outlet end connections of the valve shall beidentical for any given valve.5. Ordering Information5.1 Ordering documentation for valves under t
21、his specifica-tion shall include the following information, as required todescribe the equipment adequately.5.1.1 ASTM designation and year of issue,5.1.2 Valve type (see 4.1.1),5.1.3 Valve style (see 4.1.2),5.1.4 Valve size (see 4.1.3),5.1.5 Valve pressure rating (see 4.1.4),5.1.6 Valve end connect
22、ions (see 4.1.5),5.1.7 Line medium,5.1.8 Temperature of line medium,5.1.9 Supplementary requirements, if any (see S1 throughS4),5.1.10 Maximum vibration frequency and displacement am-plitude, if other than specified (see S1.4), and5.1.11 Maximum permissible noise level, if other thanspecified (see S
23、1.5).6. Valve Construction6.1 Valves shall incorporate the design features specified in6.1.1-6.1.17.6.1.1 General Requirements:6.1.1.1 Valves furnished under this specification shall besoft-seated, globe-style valves using a cartridge in which allworking parts including the seat are removable as an
24、assembly.6.1.2 Materials of ConstructionMaterial requirements forthese valves shall be as follows: The pressure containingenvelope shall be 300 series corrosion-resistant steel, nickel-copper (70-30), nickel-aluminum-bronze, or bronze. Internalparts in contact with the line media shall be 300 series
25、corrosion-resistant steel, nickel-copper (70-30), copper-nickel(70-30), bronze, nickel-aluminum-bronze, or naval brass.Other materials not listed above may be selected to assurecompatibility with the line medium, weldability, and to providecorrosion resistance without requiring painting, coating, or
26、plating. Materials for contacting parts shall be selected tominimize electrolytic corrosion and galling.6.1.3 Soft-Seating InsertA soft-seating (non-metallic) in-sert, if applicable, shall be field replaceable and incorporated inthe valve plug. Soft-seating inserts shall be protected fromdirect flow
27、 impingement, excessive loading and extrusion, orany other effect jeopardizing their useful life. Soft-seatinginserts shall be of the simplest practical configuration tofacilitate emergency replacement manufacture where neces-sary.6.1.4 Pressure EnvelopeThe valve shall be designed topass a hydrostat
28、ic shell test at a pressure of at least 1.5 timesthe 100F (38C) pressure rating of the valve without anydamage.6.1.5 ThreadsThreads shall be as specified in ANSI B1.1.Where necessary, provisions shall be incorporated to preventthe accidental loosening of threaded parts. The design shall besuch that
29、standard wrenches can be used on all external bolting.Lock-wire shall not be used. Any exposed threads shall beprotected by plastic caps for shipping.6.1.6 AccessibilityAll internal parts of the valve shall beaccessible for adjustment or service, without removing thevalve body from the line.6.1.7 In
30、terchangeabilityThe valve, including all associ-ated piece parts, shall have part number identity, and shall bereplaceable from stock or the manufacturer on a nonselectiveand random basis. Parts having the same manufacturers partnumber shall be directly interchangeable with each other withrespect to
31、 installation (physical) and performance (function).TABLE 1 End Connections and Pressure Ratings for ValvesType of EndConnectionPressure RatingApplicable Documents forDimensional Details of EndConnectionsButt-welded ANSI B16.34 Class 150,300, 400, 600, 900, 1500,2500, or 4500ANSI B16.25Socket-welded
32、 ANSI B16.34 Class 150,300, 400, 600, 900, 1500,2500, or 4500ANSI B16.11Threaded (taperedpipe thread)ANSI B16.34 Class 150,300, 400, 600, 900, 1500,or 2500ANSI B1.20.1 and ANSIB16.11Union-end,ASilver-brazedMIL-F-1183 (O-ring type)400 lb/in.2(2.758 MPa)MIL-F-1183 (O-ring type)400 lb/in.2(2.758 MPa)Un
33、ion-end,ASilver-brazed803-1385946 1500 lb/in.2(10.342 MPa)803-1385946 1500 lb/in.2(10.342 MPa)Union-end,ASilver-brazed803-1385943 3000 lb/in.2(20.684 MPa)803-1385943 3000 lb/in.2(20.684 MPa)Union-end,AButt/socket weld803-1385884 6000 lb/in.2(41.369 MPa)803-1385884 6000 lb/in.2(41.369 MPa)Other, as s
34、pecified As specified As specifiedAFor union inlet and outlet end connections, only the pertinent dimensions listedin the applicable documents (Military Specification or NAVSEA Requirements)shall apply. The valve shall be supplied with the thread-pieces only, without thetail-pieces and union-nuts.F
35、1794 97 (2004)2Physically interchangeable assemblies, components, and partsare those which are capable of being readily installed, re-moved, or replaced without alteration, misalignment, or dam-age to parts being installed or to adjoining parts. Fabricationoperations such as cutting, filing, drillin
36、g, reaming, hammer-ing, bending, prying, or forcing shall not be required.6.1.8 Nonmetallic Element InterchangeabilityNonmetallic elements, including but not limited to, seat rings,soft-seating inserts, cushions, and O-rings shall be treated asseparately identified and readily replaceable parts.6.1.
37、9 MaintainabilityValve maintenance shall requirestandard tools to the maximum extent possible. Any specialtools required for maintenance shall be identified, and shall besupplied with the valve.6.1.10 ReversibilitySeat inserts shall not be physicallyreversible unless they are also functionally rever
38、sible topreclude incorrect assembly.6.1.11 AdjustmentsThere shall be no adjustments requiredin the valve during or after assembly.6.1.12 Bidirectional Operation and Bubbletight Shut-OffThe valve shall be capable of operation and bubbletightshut-off with a differential pressure equal to the rated pre
39、ssureapplied across the valve in either direction of flow.6.1.13 GuidingThe valve poppet shall be guided to pre-vent binding or seizing, and to ensure proper seating, under alloperating conditions. Proper alignment of all internal operatingparts shall be maintained with interchangeable parts and und
40、erall tolerance stack-up conditions.6.1.14 Valve Operating ForceThe maximum permissibletotal tangential force required on the handwheel/handle foroperating or seating/unseating the valve shall not exceed 50 lb(222 N), when the valve is subjected to a differential pressureequal to the rated pressure
41、applied across the valve in eitherdirection of flow.6.1.15 Pressurization RateTo prevent the possibility ofauto-ignition, the valve shall be capable of being operated tolimit the rate of downstream pressure buildup in a depressur-ized volume (with the rated pressure upstream) to 200 psi(1380 kPa) pe
42、r second. Downstream volumes for this pressur-ization rate shall be taken as 10 pipe diameters.6.1.16 OperationThe valve shall close by a clockwiserotation of handwheel/handle when viewed from directly overthe handwheel/handle.6.1.17 Envelope DimensionsFor union-end valves only,the overall envelope
43、dimensions shall be as shown in Fig. 1(angle body construction) or Fig. 2 (inline body construction),as applicable, and Table 2.7. Performance7.1 Valves shall meet the performance requirements of7.1.1-7.1.3.7.1.1 Flow CapacityThe flow capacity of the valve,expressed in terms of Cvshall be equal or g
44、reater than thevalues shown in Table 3.7.1.2 Seat TightnessValve shall be bubbletight at 1.1times the 100F (38C) pressure rating in both directions whenclosed with a handwheel/handle force not exceeding thatspecified in 6.1.14 (or the manufacturers published recom-mendations, when less).7.1.3 Extern
45、al LeakageValve external leakage shall bebubbletight at its 100F (38C) pressure rating.8. Tests Required8.1 Each valve shall pass the tests outlined in 8.1.1-8.1.4.8.1.1 Visual ExaminationThe valve shall be examinedvisually to determine conformance with the ordering data andworkmanship without disas
46、sembly.8.1.2 Hydrostatic Shell TestThe valve shall be hydrostati-cally tested with water by applying test pressures equal to 1.5times the 100F (38C) pressure rating to the inlet and outletports (with the valve in the open position) to check theFIG. 1 Angle BodyFIG. 2 Inline BodyF 1794 97 (2004)3stru
47、ctural integrity of the valve. Pressure shall be applied forthree minutes. Air or nitrogen may be used in lieu of water,providing appropriate safety precautions are taken to minimizethe risk associated with the use of a compressible fluid. Thereshall be no external leakage, permanent distortion, or
48、structuralfailure.8.1.3 Seat Tightness TestThe valve shall be seated with anapplied handwheel/handle force not exceeding that specified in6.1.14 (or the manufacturers published recommendations,when less). Air or nitrogen at 1.1 times the 100F (38C)pressure rating of the valve shall be used for seat
49、tightness test,using bubble fluid or immersing the outlet, or a line from theoutlet, under water. The valve shall show no visible evidence ofleakage over a 3-min period. The valve shall be tested in bothdirections of flow to assure bidirectional seat tightness. Forvalves used for helium or helium mixture service, the testingmedium shall be helium or helium/nitrogen mixture.8.1.4 External Leakage TestWith the valve in the partiallyopen position, air or nitrogen shall be applied at a test pressureequal to the 100F (38C) p
