Safety valve selection principle: 1. Steam boiler safety valve, the general selection of open all-spring-type safety valve S10 series; 2. Liquid medium safety valve, generally use micro-spring-loaded safety valve S10 series; 3. Air or other gases Medium safety valve, the general selection of fully enclosed spring-loaded safety valve; 4. liquefied petroleum gas tanker car or liquefied petroleum gas tanker truck safety valve, the general use of Kai-type built-in safety valve; 5. Oil well export safety valve , The general selection of pilot-operated safety valve; 6. Steam generating equipment, high-pressure bypass safety valve, the general use of safety and control of the dual function of the pilot-operated safety valve 7. If the safety valve is required to do regular open test, Wrench safety valve. When the medium pressure reaches more than 75% of the cracking pressure, use a lifting wrench to slightly lift the valve flap from the valve seat to check the safety valve opening. 8. If the medium temperature is high, Temperature, the general when the closed safety valve temperature exceeds 300 ℃ and open safety valve temperature exceeds 350 ℃, should be used with a safety valve with a radiator; 9. If the safety valve outlet back pressure is changing, the amount of change over Corrugated pipe safety valve should be used when the pressure is 10%; 10. If the medium is corrosive, the bellows safety valve should be used to prevent important parts from failure due to medium corrosion. Safety valve installation and maintenance should pay attention to the following matters Construction, installation points: 1), installation location, height, direction of import and export must meet the design requirements, pay attention to the flow direction of the medium should be consistent with the direction of the arrow marked body, the connection should be firmly . 2), the appearance of the valve must be installed before the inspection, the valve nameplate should be consistent with the current national standard "General Valve Flags" GB 12220 requirements. For the working pressure is greater than 1.0 MPa and the main pipe to play the role of cut-off valve, the installation should be carried out before the intensity and tightness test, qualified after the standard use. Strength test, the test pressure of 1.5 times the nominal pressure, the duration of not less than 5min, valve housing, packing should be no leakage as qualified. Tightness test, the test pressure of 1.1 times the nominal pressure; test duration in line with the requirements of GB 50243. 3), all kinds of safety valve should be mounted vertically. 4), safety valve outlet should be no resistance, to avoid the phenomenon of compression. 5), safety valve should be specially tested before installation, and check its official seal. 6), the use of safety valves should be regularly checked.
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