The company's pressure relief valve functions: 1. When the air bag pressure exceeds a predetermined value, the air bag pressure relief valve opens, Jiang air bag body part of the gas flow / gas exhaust pipe outside, so that the air bag so that pressure does not exceed the rating to ensure that the air bag is not due to excessive pressure and accidents. 2. When the system pressure of 1.25 to 1.4 times the rated pressure gas tank pressure relief valve will instantly release the pressure to ensure the safety of the air bag gas tank to prevent the explosion. The pressure relief valve is constructed: the cylinder, piston assembly, protective cover, lever. a. There are left and right ends of the cylinder and the cylinder flange welded group. Stainless steel b. Pistons set by the card board .O-rings, piston rod and other components. c. protective cover from the flange. Simplified and door groups. Choose the model should pay attention: First, understand the high pressure machine in the wind per minute, to understand the working pressure and tank air bag out of the wind pipe diameter, according to these specifications to choose their own type of pressure relief valves GB specifications are 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 relief valve air bag work pressure air bag should work 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). Purchase should pay attention to the seller's business intelligence, pressure relief valve itself is mine safety products; consequences of unsafe product itself will cause incalculable seller as long as qualifications are "authoritative department inspection reports, product certification" in public press release Routine maintenance valve: During normal operation, the air compressor system pressure should not exceed 7.84 × 105pa (8kg / cm2) Always check the pressure release valve cylinder, piston, flange connections and piping, there should be no air leaks, each fastening sections should not be loose. Someone should be fixed regular inspection and maintenance. When the pressure relief valve to work properly, monthly inspections thin rod extended time, the situation of corrosion. Check the O-ring seal flexibility and circumstances. In principle, the rod replaced every six months. Under special circumstances, such as pressure relief severe corrosion or obvious extension of the fine should be replaced.