Analysis and treatment for seal cast back problem of ball valve

Abstract

Abstract:

Abstract:Two ball valves with diameter 1720 mm were installed in Fujian Muyangxi Zhouning Hydropower Station.The overall operation of No.2 ball valve run well when it was first put into use,while seal cast back problem which affected automatic boot occurred at later stage.After analysis,the main reasons were seal damage and congenital design deficiency.The problems were solved by modifying the open process of No.2 ball valve,replacing the three D type seal and redesigning the package D type sealing packing.

Key words: ">Keywords:ball valve, seal, cast back problem, gland packing

WU Jinrong,WANG Jun. Analysis and treatment for seal cast back problem of ball valve[J]. Huadian Technology, 2016, 38(1): 32-35.

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Analysis and treatment for seal cast back problem of ball valve

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