Pressure Seal Technology In Applied Research At The One-piece Valve Leakage Deadline

This paper discusses in detail with pressure plugging sealants technology in integrated welding globe valve stem leakage application. Based on the technique analysis of leakage blocking with pressure in the course of development and application. Combined with the integral welding globe valve stem leakage form. On site measurement and analysis of leakage, leakage blocking with pressure injection sealing technology. Statistics of each gas station integrated welding globe valve leakage form, analysis the early stage of processing methods, through the replacement of a new valve head, a valve stem leakage treatment. But because the integral welding globe valve is located in the station yard and station or valve by-pass pipeline cut-off valve is communicated directly with the front end, trunk, the replacement of a new valve head needs emptying the two valve chamber or station field pipeline natural gas replacement, resulting in a large number of natural gas vent, loss is big. Therefore, through the economic analysis and comparison, identified with the use of plugging sealants technology to deal with leakage, through the analysis of integral welding globe valve structure, material and working principle, and gas station equipment coordinated, identified with pressure plugging sealants technology is the key to clamp structure design, fixture design, material selection and no effect on fixture design put forward higher requirements, leaking stoppage fixture should satisfy certain strength, mechanical performance and price, but also to meet the station equipment overall harmony view of practical need. This paper developed a new fixture has a unique sealing structure, its design draws on the valve seal principle, the use of the three sealing material:Graphite sealant, PTFE rubber pad, fast curing adhesive strength, through the fixture in different parts of the application, construction of a sealed cavity the leak wrapped in the cavity, to achieve the purpose of sealing. In the sealing fixture design is completed, in the laboratory simulation of pressure gauges root valve leakage blocking with pressure after treatment, for plugging under pressure to provide relevant data and actual combat experience. Then in the field of application, the successful solution to the problems of gas production process of one welding type stop valve stem leakage problems...