Zhengzhou Science and Technology Development Co., Ltd. was established in public in 2007 'is a major sales: Wind package Relief valve wind package over-temperature protection device, air bag integrated protection device, air compressor over-temperature protection device, air compressor integrated protection equipment, air compressor line monitoring and control system, the pump-line monitoring and control system, the pressure fan online monitoring and control system, hydraulic mining, hoist frequency electric control system of mine safety testing equipment research and development, coal mine hoist automation, digital R & D , innovation and application of science, engineering, trade and high-tech companies. ? The principle and structure of the pressure relief valve: The pressure relief valve from the cylinder, piston assembly, protective cover and other components. a. cylinder flange and the upper and lower ends of the cylinder block assembly welding (or cast) is made, in order to enhance the wear resistance and prevent rust cylinder made of stainless steel. b. piston group consists of cardboard, O-rings, piston rod and the like. Piston assembly from the cylinder can be loaded via the card board on the left and the piston assembly is fixed in the cylinder, so that it can not move around. c. protective cover from the flange, Simplified and door welding (or cast) together. When releasing the pressure relief valve, a protective cover prevents piston flying out assault, play a security role. d. The pressure relief valve installed in the air compressor system package export pipeline stroke is on the air flow direction, when the air compressor system is working properly, the system pressure ≤0.785 (8kgf / cm2), under this pressure, normal pressure relief valve the work. When the air bag due to soot fire or for some reason within the air bag gas explosion, the system temperature, pressure transient increases, when the pressure was raised to 1.03 ± 0.049 (10.5 ± 0.5kgf / cm2), the lever pull off immediately pressure relief valve to release the pressure in the air bag and piping hot, high pressure gas is rapidly released so help ease the shock wave, avoiding accidents Selection Notice pressure relief valve in public and precautions:? According to a duct diameter size, and then to determine the size of the air bag pressure release valve lever setting value according to the maximum working pressure of the air compressor. Caliber air bag pressure relief valve shall not be less than the diameter of the outlet pressure relief should work for the highest air compressor 1.25 to 1.4 times (set value). Then 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 air bag working pressure and 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, the release of pressure working pressure must be 1.25 -1.4 times, i.e. 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. ? Why air bag release valve lever do pull test. If you do pull test, the air bag when the pressure exceeds the operating pressure of 1.25-1.4 times the pressure relief valve will not instantly release the pressure, this will cause an explosion of the air bag. All the air bag pressure relief valve lever pull test must be done, so as to ensure a more effective air bag is working properly. ?