JIS B2351-1990 25 MPa 250 kgf cm2 bite type of valves
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ID： |
C4E486DCBC0B406AA588F133A25D5331 |
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文件大小(MB)： |
1.08 |
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页数： |
26 |
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日期： |
2024-6-24 |
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文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
JIS UDC 621.643.41:62-822,The text in Japanese of this English verst,has been withdrawn, Jun加2U0!T,Japanese Industrial Standard,25 MPa (250 kgf/cm2),bite type tube fittings,for hydraulic use,JIS B 2351 -,Translated and Published,by,Japanese Standards Association,刃,Printed in Japan 14 S,丒ツ,a,K),In the event of any doubt arising,the original Standard in Japanese is to be final authority,Errata for JIS (English edition) are printed in Standardization Journal, published monthly,by the Japanese Standards Association.,Errata will be provided upon request, please contact;,Business Department,Japanese Standards Association,4-1-24, Akasaka, Minato-kU/,Tokyo, JAPAN 107,TEL. 03-3583-8002,FAX. 03-3583-0462,Errata are also provided to subscribers of JIS (English edition) in Monthly Information.,皿,屈,UDC 621.643,41:62-822,JAPANESE INDUSTRIAL STANDARD J I S,25 MPa (250 kgf/cm2} B 2351-1990,bite type tube fittings,fbr hydraulic use,1. Scope,This Japanese Industrial Standard specifies the bite type tube 逍ttings,(hereafter referred to as the "fittings11) of the maximum working,pressure 25 MPa (250 k?f/cm2) chiefly made from the steel pipes specified,in Annex, as singled out of the family of the tube fittings for hydraulic,pipings of the maximum working temperature of 120℃ and the maximum,working pressure of 25 MPa {250 kgf/cm2}.,Note (り The bite type tube titting is a type of fitting in which,jointing is effected between the body of the Atting and the,tube with a sleeve fitted into it* thereby hermetically,sealing the pressure liquid, Fig. 1 shows an example.,Remarks 1. Applicable Standards to this Standard are shown in,Attached Table 8.,2. The units and numerical values given in { } in this,Standard are based on the traditional units and are,currently the criteria in force.,Fig. 1. Assembled Structure of Fitting (Example),(a) Taper Threaded Nipple,a,ff,B 2351-1990,(b) Parallel Threaded Blbow,2. Classification,The fittings shall be classified into the categories (hereafter referred,to as the "type") according to the shape, the size and the type of the,connector end of the fittings. The 17 types according to the shape and the,type of the connector end shall be as shown t in Table 1. The size types,shall be divided into 11 types shown in Attached Tables 1 to 6 according to,the applicable size of tube ?,ノ6,JJb,り,B 2351-1990,Table 1, Type and Symbols of Fittings,Type Symbol Remark,Type O parallel threaded nipple NSO Attached Table 1,Type E parallel threaded nipple NSE Attached Table 1,Taper threaded nipple NT Attached Table 1,Welding nipple NW Attached Table 2,Union u Attached Table 3,Bulkhead-attached threaded union UP Attached Table 6,Bulkhead-attached welding* union UW Attached Table 2,Parallel threaded elbow LS Attached Table 4,Taper threaded elbow LT Attached Table 5,Union elbow LU Attached Table 3,Bulkhead-attached threaded union elbow LUP Attached Table 6,Middle T with parallel thread TSA Attached Table 4,Middle T with taper thread TTA Attached Table 5,End T with parallel thread TSB Attached Table 4,End T with taper thread TTB Attached Table 5,Union T TU Attached Table 3,Bulkhead-attached threaded union T TUP Attached Table 6,3. Quality,3.1 Thrust Condition When the fitting1 is tested by the method of 5.2,its sleeve-shall ret由n a circular notch around the outer surface of the,tube. In this case, there shall be no collapse (2) of the tube, no excess,swelling1 in the center of the sleeve, and no cracks on the surface of the,sleeve.,Note (2) The words wcollapse of the tube” herein means the,contraction of the inside diameter due to the biting1 of the,sleeve.,3.2 Capability of Repeated Assembling When a fitting is tested by the,method 67 5.3丒2, ft shall show no leakage,3.3 Pressure Resistance When a fitting is tested by the method of,5.3.3, it~shall show neither leakage nor breakage.,3.4 Impulse Resistance When a fitting is tested by the method of,5.3.4, it shall show neither leakage nor breakage.,3.5 Flexure Resistance When a fitting is tested by the method of,5.3.5 (1) usin^ test equipment specified in 5.3,5 (2), it shall show neither,leakage nor other abnormidities.,3.6 Hardness of Product The sleeve shall have surface hardness of,not less than HV 500 as a-result of a suitable surface hardening treatment.,友,4,B 2351T990,3,7 Shape and Dimensions The shape and dimensions of the fittings,shall meet the following requirements:,(1) The shape and dimensions of the fittings shall be as,specified in Attached Tables 1 to 九,(2) The O ring used at the connector end of the parallel thread type,fitting shall be as specified in JIS B 2401,(3> The permissible inaccuracy in the angle formed by each axis of……
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