1. Exposed type full lift spring safety valve is usually chose for steam boiler using. 2. Low lift spring safety valve is usually chose when the medium is liquid. 3. Sealed Fall lift Spring safety valve is usually chose when the medium is air or other 4.Full lift inner safety valve is usually chose for tank-truck for liquefied petroleum gas using or tank car for liquefied petroleum gas using . 5. Pilot operated safety valve is usually chose for Christmas tree using 6. The pilot operated safety valve with functions of safety and controlling is usually used in turbine high pressure bypass of steam-electric power equipment 7. The safety valve with release level should be chose when the opening-test is demanded regularly. Disc can be lifted slightly at the fluid pressure above 75% of opening pressure 8. If temperature of medium is higher, the safety valve with radiator should be chose to bring down the temperature of spring cavity when operating temperature above 300?? in sealed type safety valve or above 350?? in exposed type safety valve. 9. Bellow seal safety valve should be chose when backing pressure of valve is changed and amount of change above 10% of opening pressure. 10.If the medium is caustic, bellow seal safety valve should be chose to protect important parts from fault. Pay attention in installing and maintaining safety valve

1. All kinds of safety valve should be installed vertically 2. There should be no resistance in exit of safety valve to avoid pressure 3. Safety valve should have special test and seal test before installation 4. Using-safety-valve should be checked regularly