1, the steam boiler safety valve, generally choose open and all spring safety valve S10 series; 2, liquid medium with safety valve, generally choose tiny qi spring safety valve S10 series; 3, air or other gas medium with relief valve, generally choose closed all rev type spring safety Industrial Valves; 4 in rail tanker car tank lorry or liquefied petroleum gas (LPG), liquefied petroleum gas with relief valve, general use full rev type built-in relief valve; 5, production export with safety valve, pilot operated relief valve is generally selected; 6 high pressure bypass valve, steam power generation equipment, has a dual function of safety and control is generally selected pilot operated relief valve 7, if you want to do when you start the test on a regular basis, you should be chosen with wrench of the relief valve. When the medium pressure reaches more than 75% of the opening pressure, can use spanner to ascend will disc slightly, from the seat to check for the flexibility of the relief valve opens; 8, if the medium temperature is higher, in order to lower the temperature of the spring chamber, generally when the temperature of the safety valve in closed more than 300 ℃, and open the relief valve using the temperature over 350 ℃, the relief valve should be chosen with the radiator; 9 back pressure is changing, if the valve outlet, and its variation by more than 10% of the opening pressure, should choose bellows valve; If, corrosive medium, should choose bellows valve, prevent important component failure due to corrosion by the medium. 11, the relief valve installation and maintenance of the construction, installation, the following points should be paid attention to 1) , installation position and height, import and export direction must comply with the design requirements, pay attention to the medium flow direction should be consistent with the body the direction of the arrow, the connection should be firmly connected. 2) And a visual inspection must be conducted before installation of valve, the valve nameplate should be consistent with existing national standards 'universal signal valve' GB 12220. For the working pressure is greater than 1. 0 MPa and the valve with the function of cutting off on ZhuGanGuan, strength and strict performance test should be done before the installation, qualified rear must use. Strength test, the test pressure for the nominal pressure of 1. 5 times, duration of not less than 5 min, shell and packing shall be no leakage of Industrial Valves shall be qualified. Leak test, the test pressure for the nominal pressure of 1. 1 times; The duration of the test meet the requirements of GB 50243. 1. All kinds of safety valve should be installed vertically. 12, the relief valve outlet should be without resistance, avoid to produce compression phenomenon. 13, the relief valve should be specially test before installation, check and its official seal. 14 and the relief valve should be of use in regular inspection.

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