1、 , Reconditioning of Metallic Gate, Globe, and Check Valves API 621 , 2010 This Standard has been translated by the Scientific and Industrial Valve Manu-facturers Association with the permis-sion of the American Petroleum Institute (API). This translated version shall not replace nor supersede the E
2、nglish lan-guage version which remains the official version. API shall not be responsible for any errors, discrepancies or misinterpre-tations arising from this translation. No additional translation or reproduction may be made of the Standard without the prior written consent of API. - (API). , . A
3、PI , , . API. , Reconditioning of Metallic Gate, Globe, and Check Valves Downstream Segment API 621 , 2010 API RECOMMENDED PRACTICE 621 THIRD EDITION, AUGUST 2010 - () (API) 2011-105396 API, API, . American Petroleum Institute (API) . , , . API , , , , , , , , ( ) - , . API , , , . API . , ; , - , ,
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5、ington, DC 20005. , , . , API , , , , . , 2 , . , API : API API , : 1220 L Street, NW, Washington, DC 20005. API : 1220 L Street, NW, Washington, DC 20005, standardsapi.org. v 1 1 2 1 3 2 4 2 4.1 . 2 4.2 . 2 4.3 . 2 4.4 3 5 , , 3 5.1 3 5.2 . 3 5.3 - . 3 5.4 4 6 4 6.1 4 6.2 . 5 6.3 . 6 6.4 6 6.5 . 6
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8、ew York, New York 10016, www.asme.org 8 API 621 ASME, , , V, ASME, , , IX, ASTM A1932, ASTM A194, ASTM A216, , . ASTM A217, , . ASTM A351, , - () , . ISO 90013, MSS SP554, , , ( ) MSS SP 9, , . 3 3.1 , , . 3.2 , . 4 4.1 4.1.1 , , , , , / , . 4.1.2 () , . 4.2 () , , 4.3 , , : 2 ASTM International, 10
9、0 Barr Harbor Drive, West Conshohocken, Pennsylvania 19428, www.astm.org. 3 International Organization for Standardization, 1, ch. de la Voie-Creuse, Case postale 56, CH-1211, Geneva 20, Switzerland, www.iso.org. 4 Manufacturers Standard Society of the Valve and Fittings Industry, Inc., 127 Park Street, N.E., Vienna, Virginia 22180-4602, www.mss-. 8 API 621 1) ; 2) , / ; 3) , ; 4) . 4.4
