According to the "Coal Mine Safety Regulations" 439 provides: provisions must be equipped with the reliable operation of the safety valve and drain valve on the air bag, and inspection hole. Must be periodically remove grease air package. The new installation or maintenance of the air bag after the application of 1.5 times the working pressure air compressor to do the hydrostatic test. In the air bag discharge piping must be installed pressure relief valve, pressure relief valve diameter shall not be less than the diameter of the duct, release the pressure of the air compressor maximum working pressure of 1.25 to 1.4 times the safety valve: used to ensure the air bag pressure ? Do not exceed a certain value element and the pressure relief valve: prevent the air bag to the instantaneous release of large explosion pressure combustion gas flow means; valve operation setting value 1.1 times the rated pressure of the air bag, and the pressure relief valve bleed air bag setting value of 1.25-1.4 times the rated pressure; and automatically reset safety valve pressure relief valve must be replaced once the action before the reset element in the pressure drop. Wind package Relief Valve material: cast steel, cast stainless steel mainly copper.... Connection: flange connection threaded screw connection... Pressure relief valve of the model: According to the air bag out of the duct diameter to be, GB specification is QHF-50, QHF-65, QHF-80, QHF-100, QHF-125, QHF-150, QHF-200, QHF -250 according to the working pressure of the air bag and the pressure relief valve pressure, working pressure air bag pressure relief valve should the air bag's working pressure, in accordance with the national standard for all of the air bag pressure relief valve is working pressure should be 8 kg, release the pressure You must be 1.25-1.4 times the working pressure, which is 10-11.2 kg. Another (many manufacturers say is a patented product, please verify product patent number of customers to buy, so as not to be deceived). The company also can provide customers with a variety of professional custom size, protection air bag pressure relief valve pressure values. ?