Because of the increase in demand as well as the spacing device of the valve opening and closing, get the valve opening and closing process, striped tube has been preset range scale. Because the packing sees fit and use of ptfe material, material, if excessive open valve, will cause the flat key 1 set packing, there is no way to open and close valve, and killed the markings tube component, result in media leakage along the valve stem. 2. 2 office markings tube by the valve office background despicable is the leading cause of its fault a comprised. 3. Improved by not for himself what the problems existing in the analysis of the Industrial Valves, the structure, operation and background is improved. Because the stripes Marine valve pipe in the installed on the hull of the office for a long period of time in the salt fog in the background, and the upper condensate dripping water, lead to the upper thrust ball bearing corrosion, serious when, cause sexual contact with the valve stem corrosion 2. 3 operation is in use if excessive tube by the valve open or closed, it could cause the valve can not be satisfied the relevant performance requirements. The first is to increase the key I limit welfare funds, the packing information of ptfe material increase a thick 3 ㎜ stainless steel packing cushion, in order to avoid packing become dirty and stem of limit. Stem up and down the moving distance of flat key 1 progressive movement, until the flat key 1 on end face and packing the face under contact. 2. 1 structure stem see fit while using speckle pipe and packing twofold tightly closed structure, striped tube with inner ring and outer ring welding into stripes tube component, then with the valve stem and guide body welding, blocking medium through the valve stem leakage outward. When the valve opens, when the valve is open to a certain height, stem met little resistance, try not to then forced open, in order to prolong the survival of stem and tight sealing components of fixed number of year. Q: by the end of valve, stainless steel stripes tube failure analysis and treatment of answer: 1 using stainless steel stripes tube by the valve installed in ship power plant piping, happened in the process of using the valve stem leakage and stem rust problem such as death, although the repair problems and show it. Excessive open valve, may be operating markings tube component, lead to valve leakage. 2 problem analyzing speckle stainless steel tube by the ordinary is divided into internal leakage and leakage valve leak two things, actuating comprised more leaks. 4 conclusion speckle tube by the valve after the improvement, not happening again markings tube cracking, stem rust and leakage fault, use condition is satisfactory. Excessive close the valve, may be a crush tightly closed surface, causing the valve using tightly closed again lose effectiveness. Upper stem with a thrust ball bearing by the valve, the installation, should try to prevent coagulation water dripping directly on the valve registered permanent residence this getting the position of the valve stem rust. Fault analysis comprised by not for himself, to take the appropriate solution, eliminate the fault, to ensure the performance of the valve. 。 when the valve is closed, if display that there is no way to capture, should not be making greater force closed, but open valve, with fluid washout period after shut down again, and again, if still have no way to shut down, should be seizing tightly closed surface grinding. Joint use of things present situation analysis, revealed the valve stem leakage comprised of main valve structure, with background and use the office operation related forms. The body's secretion is common factors including solid impurities in the liquid medium mutilate tightly closed surface actuating lose effectiveness. Speckle tube tensile length and amount of compression is based on the valve stroke confirmed, if exceed the limit tensile or compression, could destroy markings, lead to editorial tube cracks, tightly closed lose effectiveness. 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