1、Designation: F1793 97 (Reapproved 2016)1An American National StandardStandard Specification forAutomatic Shut-Off Valves (Also Known as Excess FlowValves, EFV) for Air or Nitrogen Service1This standard is issued under the fixed designation F1793; the number immediately following the designation indi
2、cates 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.This standard has been approved for use by agencies of
3、 the U.S. Department of Defense.1NOTEKeywords were added editorially in September 2016.1. Scope1.1 This specification covers self-contained automatic shut-off valves (also known as excess flow valves) for air ornitrogen service. They are intended to be installed as safetydevices to quickly and autom
4、atically shut off flow under certainexcess flow conditions caused by a downstream failure orcasualty, such as a hose rupture.1.2 The values stated in inch-pound units are to be regardedas standard. The values given in parentheses are mathematicalconversions to SI units that are provided for informat
5、ion onlyand are not considered standard.2. Referenced Documents2.1 ASTM Standards:2F992 Specification for Valve Label Plates2.2 ANSI Standards:3ANSI B1.1 Unified Screw Threads (UN and UNR ThreadForm)ANSI B1.20.1 Pipe Threads, General Purpose (Inch)ANSI B16.11 Forged Steel Fittings, Socket-Welding an
6、dThreadedANSI B16.25 Buttwelding EndsANSI B16.34 ValvesFlanged, Threaded, and Welded End2.3 Military Standards and Specifications:4MIL-STD-167-1 Mechanical Vibrations of ShipboardEquipment (Type IEnvironmental and Type IIInternally Excited)MIL-STD-740-1 Airborne Sound Measurements and Accep-tance Cr
7、iteria of Shipboard EquipmentMIL-S-901 Shock Tests, H.I. (High-Impact); Shipboard Ma-chinery Equipment and Systems, Requirements forMIL-F-1183 Fitting, Pipe, Cast Bronze, Silver-Brazing,General Specification for2.4 Government Drawings:4Naval Sea Systems Command (NAVSEA)NAVSEA 803-1385884 Unions, Fit
8、tings 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 Inspection3. Terminology3.1 Definitions:3.1.1 automatic shut-off valveautomatic shut-off valvescovered
9、 by this specification trip shut in response to thepressure differential across the valve.3.1.2 bubble-tightno visible leakage over a 3-min periodusing either water submersion or the application of bubble fluidfor detection.3.1.3 external leakageleakage from the automatic shut-offvalve that escapes
10、to atmosphere.3.1.4 hydrostatic shell test pressurethe hydrostatic shelltest pressure that the automatic shut-off valve is required towithstand without damage. Automatic shut-off valve operationis not required during application of shell test pressure, but itmust meet all performance requirements af
11、ter the shell testpressure has been removed.3.1.5 pressure ratingsthe pressure ratings of the automaticshut-off valves shall be as defined in the documents listed inTable 1. The pressure ratings (also called pressure-temperatureratings) establish the maximum allowable working (service)pressures of a
12、 component (valve, end connections, and soforth) at various temperatures.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 Sept. 1, 2016. Pu
13、blished September 2016. Originallyapproved in 1997. Last previous edition approved in 2010 as F1793 97 (2010).DOI: 10.1520/F1793-97R16E01.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume
14、information, refer to the standards Document Summary page onthe ASTM website.3Available from American National Standards Institute (ANSI), 25 W. 43rd St.,4th Floor, New York, NY 10036, http:/www.ansi.org.4Available from Standardization Documents Order Desk, Bldg. 4 Section D, 700Robbins Ave., Philad
15、elphia, PA 19111-5094, Attn: NPODS.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States13.1.6 seat tightnessthe ability of the automatic shut-offvalve to prevent leakage from the valve-inlet to the valve-outlet.3.1.7 set pointa combination
16、 of inlet pressure and flow, atwhich the valve trips shut.3.1.8 set point accuracythe band of accuracy of theautomatic shut-off valve expressed as a range of flow rates at agiven inlet pressure, established by the following two points:3.1.8.1 DiscussionAcombination of inlet pressure-flow, ator below
17、 which the automatic shut-off valve will not trip shut(valve will remain open) regardless of influences such as springrelaxation, mechanical shock or vibration, and so forth.3.1.8.2 A combination of inlet pressure-flow, at or abovewhich the automatic shut-off valve will trip shut (valve will notrema
18、in open) regardless of influences tending to resist closuresuch as breakloose friction, corrosion, or sludge, and so forth.3.1.9 set-point rangethe range of set points over whichthe automatic shut-off valve can be adjusted. Expressed as arange of flow rates at a given inlet pressure.4. Classificatio
19、n4.1 Automatic shut-off valves shall be of the followingtypes, styles, sizes, pressure ratings, and end connections:4.1.1 Types:4.1.1.1 Type IValves that can be adjusted or repairedwithout removing the valve from pipe line.4.1.1.2 Type IIValves that cannot be adjusted or repairedwithout removing the
20、 valve from pipe line.4.1.2 Styles:4.1.2.1 Style 1Automatic Reset ConstructionThesevalves are designed to limit the flow of air or nitrogen uponclosure to a small predetermined level. These valves resetautomatically once the service line downstream is made air ornitrogen-tight and pressure is equali
21、zed across the valve.4.1.2.2 Style 2Manual Reset ConstructionThese valvesare designed to stop the flow of air or nitrogen upon closure.These valves must be manually reset.4.1.3 SizesAutomatic shut-off valves shall be of the fol-lowing NPS sizes:14 (13.5 mm),38 (17.2 mm),12 (21.3 mm),34 (26.9 mm), 1
22、(33.7 mm), 114 (42.4 mm), 112 (48.3 mm), and2 (60.3 mm). Unless otherwise specified in 5.0, the valve inletsize shall be the same as the outlet size.4.1.4 Pressure RatingsAutomatic shut-off valves shallhave pressure rating(s) selected (see 3.1.5) from Table 1. Thepressure rating(s) selected shall be
23、 specified in Section 5. Theinlet and outlet pressure ratings of the automatic shut-off valveshall be the same for any given valve.4.1.5 End ConnectionsAutomatic shut-off valves shallhave end connections selected from those listed in Table 1 andspecified in Section 5.5. Ordering Information5.1 Order
24、ing documentation for automatic shut-off valvesunder this specification shall include the followinginformation, as required, to describe 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 Val
25、ve pressure rating (see 4.1.4),5.1.6 End connections (see 4.1.5),5.1.7 Valve inlet operating pressure,5.1.8 Set point (see 3.1.7 and 7.2),5.1.9 Tamper-proof set point adjustment, if required (see6.3.2),5.1.10 Supplementary requirements, if any (see S1 throughS4), and5.1.11 Maximum vibration frequenc
26、y and displacementamplitude, if other than specified (see S1.2).6. Valve Construction6.1 Valves shall incorporate the features specified in 6.2 6.16.6.2 Materials of ConstructionMaterial requirements forthe automatic shut-off valve shall be as follows: The pressure-containing envelope shall be 300 s
27、eries corrosion-resistantsteel (304, 304L, 316, or 316L). Internal parts includingsprings, poppets, retainers, etc. shall be 300 series corrosion-resistant steel, nickel-aluminum-bronze, nickel-copper (70-30),or bronze. Other materials for both the pressure-containingenvelope and internal parts may
28、be selected to assure compat-ibility with the line medium, weldability, and to providecorrosion resistance without requiring painting, coating, orplating. Materials for contacting parts shall be selected tominimize electrolytic corrosion and galling.6.3 General Requirements:6.3.1 Automatic shut-off
29、valves shall be self-contained,requiring no external power source for operation. The auto-matic shut-off valve shall be capable of meeting all require-ments of this specification and provide extended reliableoperation.TABLE 1 Pressure Ratings for Automatic Shut-Off ValvesType of EndConnectionPressur
30、e 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, or 4500ANSI B16.11Threaded (taperedpipe thread)ANSI B16.34 Class 150,300, 400, 60
31、0, 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) 400lb/in.2(2.758 MPa)Union-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
32、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 and outlet end connections, only the pertinent dimensions listedin the applicable do
33、cuments (Military Specification or NAVSEA Requirements)shall apply. The valve shall be supplied with the thread-pieces only, without thetail-pieces and union-nuts.F1793 97 (2016)126.3.2 Automatic shut-off valves shall incorporate a provi-sion for manually resetting. This shall constitute an isolatab
34、lebleed-by which is operable with the valve in the pipeline underpressure and which functions by equalizing pressure across thepoppet. Style 1 valves shall in addition, incorporate a provisionwhich automatically resets the valve, and which constitutes asmall non-isolatable bleed-by.6.4 ThreadsThread
35、s 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 standard wrenches can be used on all external bolting.Lock-wire shall not be used. Any exposed threads shall beprotected by plasti
36、c caps for shipping.6.5 InterchangeabilityThe automatic shut-off valve, in-cluding all associated piece parts, shall have part numberidentity, and shall be replaceable from stock or the manufac-turer on a nonselective and random basis. Parts having thesame manufacturers part number shall be directly
37、 interchange-able with each other with respect to installation (physical) andperformance (function). Physically interchangeableassemblies, components, and parts are those which are capableof being readily installed, removed or replaced withoutalteration, misalignment, or damage to parts being instal
38、led orto adjoining parts. Fabrication operations such as cutting,filing, drilling, reaming, hammering, bending, prying, or forc-ing shall not be required.6.6 Nonmetallic Element InterchangeabilityNonmetallicelements, including but not limited to, seat rings, poppet seatinserts, cushions, and O-rings
39、 shall be treated as separatelyidentified and readily replaceable parts.6.7 MaintainabilityMaintenance shall require standardtools to the maximum extent possible. Any special toolsrequired for maintenance shall be identified, and shall besupplied as part of the valve.6.8 ReversibilitySeating inserts
40、, if applicable, shall not bephysically reversible unless they are also functionally revers-ible to preclude incorrect assembly.6.9 AdjustmentsThere shall be no adjustments required inthe automatic shut-off valve during or after assembly other thanthe set point.6.10 Pressure EnvelopeThe valve shall
41、be designed topass a hydrostatic shell test at a pressure of at least 1.5 timesthe 100F (38C) pressure rating of the valve without damage.6.11 Body ConstructionAll pressure lines, including thereset bleed line, shall be internally ported. The bonnet andbottom cap (where applicable) shall be attached
42、 to the body bybolting, threading, or threaded-union connections.6.12 Set-Point AdjustmentSet point shall be adjustablethrough the range specified in 7.4. Type I valves shall beadjustable with the valve in the line under pressure. Type IIvalves may be removed from the line for adjustment. The setpoi
43、nt shall incorporate right-hand threads so that a clockwiserotation increases the set point. Means shall be used to preventan accidental or inadvertent change in set point. The option ofa tamper-proof set-point adjustment (lead seal, and so forth)shall be available and shall be specified as in Secti
44、on 5.6.13 Port ConfigurationThe automatic shut-off valveshall have in-line inlet and outlet ports.6.14 SpringsSpring incorporated in the automatic shut-offvalve shall not be compressed solid during operation. Springends shall be squared and ground. Engagement or disengage-ment of parts against sprin
45、g compression shall not be permit-ted.6.15 GuidingThe valve poppet shall be guided to preventbinding or seizing, and to ensure proper seating under alloperating conditions. Proper alignment of all internal operatingparts shall be maintained with interchangeable parts and underall tolerance stack-up
46、conditions.6.16 AccessibilityType I automatic shut-off valve shall beaccessible for adjustment or service, without removing theautomatic shut-off valve from the line.7. Performance Requirements7.1 Automatic shut-off valves shall meet the requirementsof 7.2 7.8.7.2 Set PointThe required set point as
47、defined in 3.1.7,shall be as specified (see Section 5).7.3 Set-Point AccuracyThe set-point accuracy, as definedin 3.1.8, shall be plus or minus 10 % of the set point.7.4 Range of Set-Point AdjustmentAutomatic shut-offvalves shall be capable of meeting all performance require-ments when set at any po
48、int within plus or minus 25 % of thenominal specified set point.7.5 Trip Differential PressureThe pressure differential atwhich the automatic shut-off valve trips shut shall not exceedthe values specified in Table 2.7.6 Reset PressureOnce shut, the automatic shut-off valveshall remain shut until the
49、 pressure across the valve isequalized.7.7 Seat TightnessOnce shut, and with the manuallyoperated isolatable bleed-by closed, the automatic shut-offvalve shall meet the following seat tightness requirements.Where necessary, leakage measurement shall start after tem-perature stabilization.7.7.1 Style 1 ValvesFlow leakage shall not be less than2 % and no greater than 5 % of the set-point flow.7.7.2 Style 2 ValvesFlow leakage shall not exceed 60standard cubic inches per hour (SCIH), per inch of valve size.7.8 External Leakage
