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Safety Valve Selection Principle
Nov 23, 2017

1.. Steam boiler safety valve, the general use of open full open spring safety valve S10 series;

2, liquid medium safety valve, the general use of micro open spring safety valve S10 series;

3, air or other gas medium with safety valve, generally choose closed full open spring safety valve;

4, liquefied petroleum gas tank car or liquefied petroleum gas tank car safety valve, the general use of the full Kai type built-in safety valve;

5, the use of safety valve for export well, generally use pilot safety valve;

6. The high pressure bypass safety valve of steam power generation equipment generally adopts the pilot safety valve with dual functions of safety and control

7, if you need to do regular opening test on the safety valve, you should choose the safety valve with lifting wrench. When the medium pressure reaches more than 75% of the opening pressure, the lifting valve can be lifted slightly from the valve seat, so as to check the flexibility of the safety valve opening;

8, if the medium temperature is high, in order to reduce the temperature of the spring chamber, generally when the closed type safety valve use temperature is more than 300 degrees and the open type safety valve use temperature is more than 350 degrees, should choose the safety valve with radiator;

9, if the safety valve outlet pressure is change, its change exceeds the opening pressure of 10%, should choose Bellows Safety valve;

10, if the medium is corrosive, the bellows safety valve shall be chosen to prevent the failure of the important parts due to the corrosion of the medium.

11, safety valve installation and maintenance should pay attention to the following matters, construction, installation points 1), installation position, height, import and export direction must comply with the design requirements, pay attention to the direction of medium flow should be consistent with the direction of the body marked arrow, the connection should be strong and tight. 2) the valve must be checked before installation, and the nameplate of valve should be in accordance with the current national standard "general valve sign" GB 12220. For the valve with working pressure greater than 1 MPa and cutting off on the main pipe, the strength and tight performance test should be carried out before installation. Strength test, the test pressure is 1.5 times the nominal pressure, duration of not less than 5min, the valve shell and filler should be no leakage qualified. When the tightness test, the test pressure is 1.1 times the nominal pressure; the test duration is in line with the requirements of GB 50243. 1. all kinds of safety valve should be vertical installation.

12, safety valve outlet should be no resistance to avoid compression phenomenon.

13, the safety valve should be tested before installation, and check its official seal.

14, the use of the safety valve should be made