... sweeperApplicable Working Conditions:Suitable for the conveying pipeline of Gas, Petroleum, Chemical, Oil& Gas Tank etc. as the on-off device. ... nitrogenizedSuitable for the pipelines of hot water, steam-gas, oil under high temperature and high pressure of thermal power station, petro ... for the pipeline with medium, like water, steam, ash-gas, oil or fog-shaped, powder-shaped particle, especially the ...