..... Zhengzhou Guang Public Technology Development Ltd. was established in 2007 "is a professional mining areas of research and development of intelligent automation of digital products sales and service as one of the national high-tech enterprises, the main sales: wind package Relief pressure valve, over-temperature protection air bag, the air bag integrated protection device, air compressor over-temperature protection device, air compressor integrated protection device, air compressor line monitoring and control system, the pump-line monitoring and control system, the pressure fan online monitoring and control system, mining hydraulic station, hoist frequency electric control system of mine safety testing equipment research and development, coal mine hoist automation, digitization of research and development, innovation and application of science, engineering, trade and high-tech companies. Wind package Relief Valve is an important mine safety production safety project, according to the "Coal Mine Safety Regulations" provisions of Article 439 of the operation must be equipped with reliable 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 pressure of 1.25 to 1.4 times the maximum working pressure of the air compressor in public Selection Notice and pressure relief valve Note: Depending on the size of the diameter of the wind, 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). Why wind package Relief 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. The company has the most authoritative and product qualification certificates Rally inspection reports, this product is the company's patented product, patent number: 201030169562.1. The company is the only one in Shanxi Province designated manufacturers, and Shanxi Coal Mine Safety Supervision Bureau issued by the designated certificate. GB specification is QHF-50, QHF-65, QHF-80, QHF-100, QHF-125, QHF-150, QHF-200, QHF-250. According to the air bag's working pressure and pressure relief valve pressure, wind package Relief Working pressure should the air bag pressure valve 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 pressure 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.