1、Designation: F1794 97 (Reapproved 2010)An American National StandardStandard Specification forHand-Operated, Globe-Style Valves for Gas (Except OxygenGas) and Hydraulic Systems1This standard is issued under the fixed designation F1794; the number immediately following the designation indicates the y
2、ear 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, t
3、est-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 specification i
4、n 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:2F992 Specification for Valve Label Plates2.2 American National Standards Institute (ANSI):3ANSI B1.1 Unified Screw Threads (UN and
5、 UNR ThreadForm)ANSI B1.20.1 Pipe Threads, General Purpose (Inch)ANSI B16.11 Forged Steel Fittings, Socket-Welding andThreadedANSI B16.25 Buttwelding EndsANSI B16.34 ValvesFlanged, Threaded, and Welded End2.3 Military Standards and Specifications:4MIL-STD-167-1 Mechanical Vibrations of ShipboardEqui
6、pment (Type IEnvironmental 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-Brazi
7、ng,General Specification 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 Braz
8、ing,WOG for UT Inspection3. 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 valv
9、e to pass flowunder 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) i
10、s applied across thevalve.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.1This specification is under the jurisdiction of ASTM Committee
11、F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.11 onMachinery and Piping Systems.Current edition approved May 1, 2010. Published June 2010. Originallyapproved in 1997. Last previous edition approved in 2004 as F1794 - 97 (2004).DOI: 10.1520/F1794-97R10.2For re
12、ferenced 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 onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W.
13、43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.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 St
14、ates.3.1.5 hydrostatic shell test pressuresthe hydrostatic testpressures that the valve 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
15、.3.1.6 internal leakageleakage from higher pressure tolower pressure portions of the valve.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 ca
16、lled pressure-temperature ratings)establish the maximum allowable working (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 re
17、taining the seat-ring/seat in the valve cartridge, asopposed to a seat-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 t
18、he following types, styles, sizes,pressure ratings, and end connections, 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.
19、3 SizesValve sizes shall be18 NPS (10.2 mm),14 NPS(13.5 mm),38 NPS (17.2 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 Sec
20、tion 5.The inlet and outlet pressure ratings of the valve shall beidentical 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 val
21、ve.5. Ordering Information5.1 Ordering documentation for valves under this 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
22、 4.1.3),5.1.5 Valve pressure rating (see 4.1.4),5.1.6 Valve end connections (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), a
23、nd5.1.11 Maximum permissible noise level, if other thanspecified (see S1.5).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 cart
24、ridge in which allworking parts including the seat are removable as an 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 b
25、ronze. Internalparts in contact with the line media shall be 300 seriescorrosion-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
26、 to providecorrosion resistance without requiring painting, coating, orplating. 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 in
27、the valve plug. Soft-seating inserts shall be protected fromdirect flow 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-sar
28、y.6.1.4 Pressure EnvelopeThe valve shall be designed topass a hydrostatic shell test at a pressure of at least 1.5 timesthe 100 F (38 C) 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 prevent
29、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 ANSI B16.34 Class 150,300, 400, 600, 900, 1500,2500
30、, or 4500ANSI B16.11Threaded (taperedpipe thread)ANSI B16.34 Class 150,300, 400, 600, 900, 1500,or 2500ANSI B1.20.1 andANSI B16.11Union-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)Union-end,ASilver-brazed803-1385946 1500 lb/in.2(10.34
31、2 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 specified As specified As specifiedAFor union inlet a
32、nd 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.F1794 97 (2010)2the accidental loosening of threaded p
33、arts. The design shall besuch that 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 t
34、hevalve body from the line.6.1.7 InterchangeabilityThe 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 interchange
35、able with each other withrespect to installation (physical) and performance (function).Physically 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
36、 adjoining parts. Fabricationoperations such as cutting, filing, drilling, 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 sha
37、ll be treated asseparately identified and readily replaceable parts.6.1.9 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 s
38、hall not be physicallyreversible unless they are also functionally reversible 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
39、 bubbletightshut-off with a differential pressure equal to the rated pressureapplied 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 intern
40、al operatingparts shall be maintained with interchangeable parts and underall 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 v
41、alve is subjected to a differential pressureequal to the rated pressure 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 depressu
42、r-ized volume (with the rated pressure upstream) to 200 psi(1380 kPa) per 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
43、.1.17 Envelope DimensionsFor union-end valves only,the overall envelope 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 CapacityTh
44、e flow capacity of the valve,expressed in terms of Cvshall be equal or greater than thevalues shown in Table 3.7.1.2 Seat TightnessValve shall be bubbletight at 1.1times the 100 F (38 C) pressure rating in both directionswhen closed with a handwheel/handle force not exceeding thatFIG. 1 Angle BodyFI
45、G. 2 Inline BodyF1794 97 (2010)3specified in 6.1.14 (or the manufacturers published recom-mendations, when less).7.1.3 External LeakageValve external leakage shall bebubbletight at its 100 F (38 C) pressure rating.8. Tests Required8.1 Each valve shall pass the tests outlined in 8.1.1-8.1.4.8.1.1 Vis
46、ual ExaminationThe valve shall be examinedvisually to determine conformance with the ordering data andworkmanship without disassembly.8.1.2 Hydrostatic Shell TestThe valve shall be hydrostati-cally tested with water by applying test pressures equal to 1.5times the 100 F (38 C) pressure rating to the
47、 inlet and outletports (with the valve in the open position) to check thestructural 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 com
48、pressible fluid. Thereshall be no external leakage, permanent distortion, or 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
49、 1.1 times the 100 F (38 C)pressure rating of the valve shall be used for seat 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 positio
