1、4100 N. FAIRFAX DR., STE. 200 ARLINGTON, VIRGINIA 222032002STANDARD forREFRIGERANTACCESSVALVES ANDHOSECONNECTORSStandard 720Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
2、Price $10.00 (M) $20.00 (NM) Copyright 2002, by Air-Conditioning and Refrigeration InstitutePrinted in U.S.A. Registered United States Patent and Trademark Office IMPORTANTSAFETY RECOMMENDATIONSIt is strongly recommended that the product be designed, constructed, assembled and installed in accordanc
3、e withnationally recognized safety requirements, appropriate for products covered by this standard.ARI, as a manufacturers trade association, uses its best efforts to develop standards, employing state-of-the-artand accepted industry practices. However, ARI does not certify or guarantee safety of an
4、y products, componentsor systems designed, tested, rated, installed or operated in accordance with these standards or that any testconducted under its standards will be non-hazardous or free from risk.Note:This standard supersedes ARI Standard 720-97.Copyright Air-Conditioning and Refrigeration Inst
5、itute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTSSECTION PAGESection 1. Purpose1Section 2. Scope 1Section 3. Definitions 1Section 4. Location Requirements .1Section 5. Dimensions and Materials .2Section 6.
6、 Gaging Procedures .2Section 7. Marking and Nameplate Data.2Section 8. Conformance Conditions 2TABLESTable 1. Conversion Table .5FIGURESFigure 1. Refrigerant Access Valve - Required Moveable Valve Core Pin Location3Figure 2. Refrigerant Access Valve - Typical Valve Body Dimensions 3Figure 3. Refrige
7、rant Access Valve - Typical Valve Core Dimensions 4Figure 4. Refrigerant Access Valve - Plug Gage.4Figure 5. Refrigerant Access Valve - Ball Gage5APPENDICESAppendix A. References - Normative6Appendix B. References - Informative.6Copyright Air-Conditioning and Refrigeration Institute Provided by IHS
8、under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-20
9、021REFRIGERANT ACCESS VALVESAND HOSE CONNECTORSSection 1. Purpose1.1 Purpose. The purpose of this standard is to establishfor Refrigerant Access Valves and Hose Connectors used inrefrigeration and air-conditioning systems: definitions;location requirements; dimensions and materials; gagingprocedures
10、; marking and nameplate data; and conformanceconditions.1.1.1 Intent. This standard is intended for theguidance of the industry, including manufacturers,engineers, installers, contractors and users.1.1.2 Review and Amendment. This standard issubject to review and amendment as technologyadvances.Sect
11、ion 2. Scope2.1 Scope. This standard applies to in SAE flareRefrigerant Access Valves and Hose Connectors as definedin Section 3.2.1.1 Refrigerant. This standard applies toRefrigerant Access Valves and Hose Connectorsintended for use with Volatile Refrigerants.2.2 Exclusions.2.2.1 This standard does
12、 not apply to RefrigerantAccess Valves and Hose Connectors other than inSAE flare.Section 3. DefinitionsAll terms in this document shall follow the standard industrydefinitions in the current edition of ASHRAE Terminology ofHeating, Ventilation, Air Conditioning and Refrigerationand ANSI/SAE Standar
13、d J513f, unless otherwise defined inthis section.3.1 Refrigerant Access Valve (Valve). A normally closedvalve containing a Valve Core, incorporating a flare connectorused for the purpose of servicing refrigeration and air-conditioning systems.3.2 Refrigerant Access Valve Body (Valve Body). A flareco
14、nnector machined to permit the insertion of a Valve Core.3.2.1 Valve Core. An assembly containing a springand moveable valve core pin and seating details,suitably threaded for insertion into a Valve Body toprovide a normally closed Valve intended for use withrefrigeration and air-conditioning system
15、s. Depressionof the moveable Valve Core pin opens the Valve.3.3 Refrigerant Access Valve Hose Connector (HoseConnector). A modified internally threaded flare connectorsuitable for sealed attachment to a refrigerant hose containinga flare sealing gasket and a depressor to automaticallydepress a movea
16、ble Valve Core pin as the connector isthreaded on the Valve external flare connection.3.4 “Shall“ or “Should“. “Shall“ or “should“ shall beinterpreted as follows:3.4.1 Shall. Where “shall“ or “shall not“ is usedfor a provision specified, that provision is mandatoryif compliance with the standard is
17、claimed.3.4.2 Should. “Should“ is used to indicateprovisions which are not mandatory but which aredesirable as good practice.3.5 Volatile Refrigerant. A fluid used for heat transfer ina refrigerating system, which absorbs heat at a lowtemperature and low pressure and transfers heat at a highertemper
18、ature and a higher pressure, usually involving changesof state.Section 4. Location Requirements4.1 Location of Valve Core Pin in Valve Body. Theinternal machining of the Valve Body shall be such that theinsertion of the Valve Core into the Valve Body requires aninitial assembly torque of 1.5 to 3.0
19、in-lb 1.7 to 3.4 cmAkg or0.17 to 0.34 Nm. The Valve Core shall provide a refrigerantseal and position the top of the moveable Valve Core pin at alocation between 0.010 in 0.25 mm above to 0.035 in 0.89mm below the end face of the Valve Body flare, see Figure 1.4.2 Location of Hose Connector Gasket a
20、nd Core PinDepressor. The Hose Connector core pin depressor shall bepositioned to permit threaded engagement with the ValveBody flare threads. The moveable core pin shall not bedepressed until the connector gasket makes contact with theValve Body flare face. Copyright Air-Conditioning and Refrigerat
21、ion Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-2002 2Note: The Hose Connector pin depressor shall be capable ofdepressing the moveable Valve Core pin a minimum of 0.02 in0.51 mm when fully engage
22、d with the Valve. Section 5. Dimensions and Materials5.1 Dimensions. All Valves that conform with thisstandard shall be interchangeable. Components ofconforming Valves will be manufactured to the dimensions ofFigures 2 and 3, and ANSI/SAE J513f, as indicated.5.2 Materials. Materials used for the sea
23、ls on the ValveCore and Hose Connectors shall be compatible for servicewith the intended Volatile Refrigerants and refrigerant oil.Section 6. Gaging Procedures6.1 Gaging. Figures 4 and 5 show two accepted methodsof gaging the Valve Body.Section 7. Marking and Nameplate Data7.1 Marking and Nameplate
24、Data. As a minimum, thepackaging for Refrigerant Access Valves and HoseConnectors shall be marked with the following information:a. The manufacturers name or trade nameb. Model designationc. Refrigerant designation(s) per ANSI/ASHRAEStandard 34 with AddendaSection 8. Conformance Conditions8.1 Confor
25、mance. While conformance with this standardis voluntary, conformance shall not be claimed or implied forproducts or equipment within its Purpose (Section 1) andScope (Section 2) unless such claims meet all of therequirements of the standard.Copyright Air-Conditioning and Refrigeration Institute Prov
26、ided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-20023Refrigerant Access Valve in SAE Flare SizeDimensions in inchesNote: 1. Required initial assembly torque shall be 1.5 to 3.0 in-lb1.7 to 3.4 cmkg or 0.17 to 0.34
27、NAmFigure 1. Required Moveable Valve Core PinLocationNotes:1. Counterbore and/or chamfer optional2. This diameter must be concentric with pitchdiameter or internal threading within .003 T.I.R.3. in SAE flare external dimensions to conform to ANSI/SAE J513fFigure 2. Typical Valve Body DimensionsCopyr
28、ight Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-2002 4Refrigerant Access Valve in SAE Flare SizeDimensions in inchesNote:1. See 5.2Figure 3. Typical Valve Core
29、Dimensions Figure 4. Plug GageCopyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-20025Refrigerant Access Valve in SAE Flare SizeDimensions in inchesFigure 5.
30、Ball GageTable 1. ConversionTablein mm0.875 22.20.551 14.00.4091 10.390.3941 10.010.308 7.820.293 7.440.210 5.330.206 5.230.197 5.000.192 4.880.189 4.800.181 4.600.1719 4.3660.1693 4.3000.168 4.270.155 3.940.150 3.810.109 2.770.076 1.930.064 1.630.035 0.8890.025 0.6350.010 0.2540.003 0.076Degrees Ra
31、dians1730N 0.30541630N 0.2880in-lb cmAAkg1.5 1.73.0 3.4Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 720-2002 6APPENDIX A. REFERENCES NORMATIVEA1 Listed here
32、 are all standards, handbooks, and otherpublications essential to the formation and implementationof the standard. All references in this appendix areconsidered as part of the standard.A1.1 ANSI/ASHRAE Standard 34-2001 withAddenda, Designation and Safety Classification ofRefrigerants, 2001, American
33、 Society of Heating,Refrigerating, and Air-Conditioning Engineers, Inc.,1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A.A1.2 ANSI/SAE Standard J513f-January99,Refrigeration Tube Fittings, 1999, American NationalStandards Institute/Society of Automotive Engineers,25 West 43rd Street, 4th Fl., New Y
34、ork, NY, 10036,U.S.A./400 Commonwealth Drive, Warrendale, PA15096, U.S.A.A1.3 ASHRAE Terminology of Heating,Ventilation, Air Conditioning and Refrigeration,Second Edition, 1991, American Society of Heating,Refrigerating and Air-Conditioning Engineers, Inc.,1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A.APPENDIX B. REFERENCES - INFORMATIVENone.Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
