1、Designation: F1793 97 (Reapproved 2010)An 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 indic
2、ates 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 Department of Defense.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 automatically shut off flow under certainexcess flow conditions ca
4、used by a downstream failure orcasualty, such as a hose rupture.1.2 The values stated in this specification in inch-poundunits are to be regarded as the standard. The SI equivalentsshown in parentheses are provided for information only.2. Referenced Documents2.1 ASTM Standards:2F992 Specification fo
5、r Valve Label Plates2.2 American National Standards Institute (ANSI):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 andThreadedANSI B16.25 Buttwelding EndsANSI B16.34 ValvesFlanged, Threaded,
6、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 Ac-ceptance Criteria of Shipboard EquipmentMIL-S-901 Shock Tests, H.I. (High-Impact); Sh
7、ipboardMachinery 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, Fittings and Adapters Buttand Socket Welding 6000 PSI, WOG, NPSNAVSEA 803-13859
8、43 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 by this specification trip shut in response to thepressure differential acr
9、oss 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 to atmosphere.3.1.4 hydrostatic shell test pressurethe hydrostatic shelltest
10、 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 after the shell testpressure has been removed.3.1.5 pressure ratingsthe pressu
11、re ratings of the auto-matic shut-off valves shall be as defined in the documents listedin Table 1. The pressure ratings (also called pressure-temperature ratings) establish the maximum allowable working(service) pressures of a component (valve, end connections,and so forth) at various temperatures.
12、3.1.6 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 of inlet pressure and flow, atwhich the valve trips shut.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Tech
13、nology 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 F1793 - 97 (2004).DOI: 10.1520/F1793-97R10.2For referenced ASTM standards, vi
14、sit 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, New Yor
15、k, 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 States.3.1.8 set point accura
16、cythe 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 DiscussionA combination of inlet pressure-flow,at or below which the automatic shut-off valve will not trip shut(valve will remain open)
17、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 notremain open) regardless of influences tending to resist closuresuch as breakloose f
18、riction, 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. Classification4.1 Automatic shut-off valves shall be of the followingtypes, styles, sizes, p
19、ressure 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 valve from pipe line.4.1.2 Styles:4.1.2.1 Style 1Automatic Reset ConstructionT
20、hesevalves 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 equalized across the valve.4.1.2.2 Style 2Manual Reset ConstructionThese valvesare de
21、signed 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 thefollowing NPS sizes:14 (13.5 mm),38 (17.2 mm),12 (21.3mm),34 (26.9 mm), 1 (33.7 mm), 114 (42.4 mm), 112 (48.3mm), and 2 (60.3 mm). Unless otherwise specifie
22、d in 5.0, thevalve inlet size 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 specified in Section 5. Theinlet and outlet pressure ratings of the automatic shu
23、t-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 Ordering documentation for automatic shut-off valvesunder this specification shall incl
24、ude the following informa-tion, 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 Valve pressure rating (see 4.1.4),5.1.6 End connections (see 4.1.5),5.1.7 Valve inl
25、et 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 frequency and displacement am-plitude, if other than specified (see S1.2).6. Valve Const
26、ruction6.1 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 series corrosion-resistantsteel (304, 304L, 316, or 316L). Internal parts inclu
27、dingsprings, 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 be selected to assure compat-ibility with the line medium, weldability, and to
28、 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 valves shall be self-contained,requiring no external power source for operatio
29、n. The auto-matic shut-off valve shall be capable of meeting all require-ments of this specification and provide extended reliableoperation.6.3.2 Automatic shut-off valves shall incorporate a provi-sion for manually resetting. This shall constitute an isolatablebleed-by which is operable with the va
30、lve 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 ThreadsThreads shall be as specified in ANSI B1.1.Whe
31、re necessary, provisions shall be incorporated to preventthe accidental loosening of threaded parts. The design shall beTABLE 1 Pressure Ratings for Automatic Shut-Off ValvesType of EndConnectionPressure RatingApplicable Documents forDimensional Details of EndConnectionsButt-welded ANSI B16.34 Class
32、 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, 600, 900, 1500,or 2500ANSI B1.20.1 andANSI B16.11Union-end,ASilver-brazedMIL-F-1183 (O-ring type)400
33、 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(10.342 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
34、 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 dimensionslisted in the applicable documents (Military Specification or NAVSEA Require-ments) shall apply. The valve shall be supplied
35、with the thread-pieces only, withoutthe tail-pieces and union-nuts.F1793 97 (2010)2such 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.6.5 InterchangeabilityThe automatic shut-off valve, in-cl
36、uding 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 interchange-able with each other with respect to installation (physical) and
37、performance (function). Physically interchangeable assem-blies, components, and parts are those which are capable ofbeing readily installed, removed or replaced without alteration,misalignment, or damage to parts being installed or to adjoin-ing parts. Fabrication operations such as cutting, filing,
38、 drilling,reaming, hammering, bending, prying, or forcing shall not berequired.6.6 Nonmetallic Element InterchangeabilityNonmetallicelements, including but not limited to, seat rings, poppet seatinserts, cushions, and O-rings shall be treated as separatelyidentified and readily replaceable parts.6.7
39、 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, if applicable, shall not bephysically reversible unless they are also fun
40、ctionally 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 be designed topass a hydrostatic shell test at a pressure of at least 1.5 t
41、imesthe 100 F (38 C) 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 to the body bybolting, threading, or threaded-union connections.6.12 Set
42、-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 setpoint shall incorporate right-hand threads so that a clockwiserotation incre
43、ases 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 Section 5.6.13 Port ConfigurationThe automatic shut-off valveshall have in-lin
44、e 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 spring compression shall not be permit-ted.6.15 GuidingThe valve poppet shall
45、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 conditions.6.16 AccessibilityType I automatic shut-off valve shall beacce
46、ssible 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 defined in 3.1.7,shall be as specified (see Section 5).7.3 Set-Point Accu
47、racyThe 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 point within plus or minus 25 % of thenominal specified set point.7.5 Trip
48、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 pressure across the valve isequalized.7.7 Seat TightnessOnce shut, and w
49、ith 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 LeakageThe automatic shut-off valve exter-nal leakage shall be bubble-tight at its opera
