How to judge the problem of pneumatic butterfly valve and how to deal with it?
Under normal circumstances, if the pneumatic butterfly valve of the car is broken, what is the disease? Xiao Bian comes to check with you!
1. Stop the car after driving 10km on the road with poor road conditions, touch the shell of the pneumatic butterfly valve with your hand. If it is not hot enough, it means that there is no resistance inside the pneumatic butterfly valve, and the pneumatic butterfly valve does not work. At this time, you can participate in the appropriate lubricating oil, and then stop the test. If the shell is hot, it means that there is a lack of oil inside the pneumatic butterfly valve, and you should add enough oil; Otherwise, the pneumatic butterfly valve is invalid.
2. Press the bumper firmly, and then release it. If the car jumps 2 to 3 times, the pneumatic butterfly valve works well. When the car is running slowly and emergency braking occurs, if the car vibrates violently, it indicates that there is a problem with the pneumatic butterfly valve.
3. Dismantle the pneumatic butterfly valve to make it stand upright, clamp the lower connecting ring on the bench clamp, and pull and press the shock absorber rod several times. At this time, there should be stable resistance. The resistance of pulling upward should be greater than the resistance of pressing downward. If the resistance is unstable or no resistance, it may be the lack of oil inside the pneumatic butterfly valve or the damage of valve parts, and the repair or replacement of parts should be stopped.
Assuming that the pneumatic butterfly valve presents a problem, it is really not a good news! What should I do!
The oil seal washer and seal washer are broken, and the nuts of the oil storage cylinder cover are loose. The oil seal and sealing washer may be damaged and invalid, so the seal shall be replaced with a new one. If the oil leakage still cannot be eliminated, the pneumatic butterfly valve should be pulled out. If it feels stuck or different, further check whether the clearance between the piston and the cylinder barrel is too large, whether the piston connecting rod of the pneumatic butterfly valve is bent, and whether the surface of the piston connecting rod and the cylinder barrel are scratched or pulled.
If there is no oil leakage in the pneumatic butterfly valve, check whether the pneumatic butterfly valve joint pin, joint rod, joint hole, rubber, bushing, etc. are damaged, desoldered, split or scattered. If the above inspection is normal, the pneumatic butterfly valve shall be further synthesized to check whether the fit clearance between the piston and the cylinder barrel is too large, whether the cylinder barrel is strained, whether the valve seal is good, whether the valve clack and valve seat fit tightly, and whether the extension spring of the pneumatic butterfly valve is too soft or broken. The method of grinding or replacing parts shall be adopted according to the situation.
In theoretical application, the pneumatic butterfly valve will present the defect of making noise, which is mainly caused by the collision between the pneumatic butterfly valve and the leaf spring, the frame or the shaft, the damage or scattering of the rubber pad, the deformation of the dust cylinder of the pneumatic butterfly valve, the lack of oil and other reasons, the reason should be found out and repaired. After the inspection and repair of the pneumatic butterfly valve is stopped, the working performance test shall be stopped on a special test bench. When the resistance frequency is 100 ± 1mm, the resistance of its stretching stroke and tightening stroke shall conform to the rules, indicating that the pneumatic butterfly valve is basically normal.
Check the possible problems of pneumatic butterfly valve in time and handle them in time! This is my responsibility! The above content is the content compiled for you! If you need to reprint, please indicate the source!

Analysis of the reason why the price of stainless steel bellows continues to rise
The market price of stainless steel bellows for domestic construction rose in an all-round way. The average price of rebar with a diameter of 25mm in major cities in China is 3829 yuan (ton price, the same below), 29 yuan higher than that on the 9th; The average price of 6.5 mm high wire in major domestic cities was 3894 yuan, up 32 yuan. In terms of leading cities: Beijing wire rod rose by 60 yuan, and the mainstream specification of secondary rebar rose by 20 yuan; Shanghai wire rod rose by 40 and thread rose by 30. Prices in all central cities have risen by 20 to 50 yuan. From the market point of view, the turnover in all major markets improved on the 9th, and the turnover of merchants with good turnover in Beijing market was more than 1000 tons, reflecting the further release of market demand. The rising price of upstream steel billets is also one of the important factors supporting the overall increase of market prices. At present, Tangshan steel billets with ordinary carbon 150 square billet 3520 and low alloy 150 square billet 3640 have increased by 50 yuan. Futures rose again on the 10th, further supporting the mentality of merchants.
Looking at the current economic situation at home and abroad, after experiencing the mixed reputation of the 2008 four trillion yuan economic stimulus plan, the domestic economic regulation authorities have gradually improved their own degree of regulation, no longer passively following Europe and the United States, "cooling down first, recovery first". The information from various speech channels is that the regulation is firm and not relaxed, but with the circuitous international economic situation, The strength or direction of domestic regulation may be slightly adjusted. Therefore, the current short-term adjustment of the price of stainless steel pneumatic butterfly valve may be a prelude to the later promotion.
As the ban on iron ore mining is still in effect in Karnataka, India's second largest iron ore consumer, the Indian High Court appointed a monitoring committee to stop the electronic auction of iron ore illegally consumed by private enterprises and kept by the Indian government. The auction of 2500 tons of iron ore kept by Karnataka started on Tuesday (September 14). This auction brings some relief to those steel consumers who are running out of raw materials. The state government plans to auction a small amount of 1.5 million tons per month. In August, when the domestic steel enterprises intensively released the results of the "high school entrance examination", the international mining giants also released their operating performance in the first half of the year in a high profile.
It is estimated that the capacity application rate of Asian stainless steel bellows plants will reach 100% in the first quarter of 2012. The steel futures market responded flexibly at the first time. The operation of merchants in the steel spot market also began to be "prudent". Although the original material price of stainless steel bellows continues to be at a high level and the interest pressure is high, many stainless steel bellows factories still have the inertia of pushing up the ex factory price, but the price of stainless steel bellows, the "leader" of domestic steel enterprises, exceeds the market estimate and is launched as "flat price+down price", which reflects the new prediction of mainstream stainless steel bellows factories on the future market. Professionals in the industry believe that the transmission speed of the central bank's policies to the stainless steel corrugated pipe market has significantly accelerated, which illustrates that the amount of capital activities in the stainless steel corrugated pipe market is not the same as before, and its increasingly obvious financial nature is worth paying attention to. Capital and inventory have become the two major joints of the stainless steel bellows market trend in the next step.
As a pressure resistant pipe fitting, stainless steel bellows is used in the liquid escort system to compensate for the mutual displacement of pipes or the connecting ends of machines and equipment. It has many characteristics such as good flexibility, light weight, corrosion resistance, fatigue resistance, and temperature resistance. Nowadays, in the market, stainless steel bellows have a strong atmosphere of looking around, and the price will continue to rise. The consumption and holding cost of stainless steel bellows are high, which forms a certain support for this kind of pipe fitting industry. The price of stainless steel bellows is rising gradually. These factors have promoted consumer manufacturers to increase the output of stainless steel. Moreover, due to the strong demand in the construction industry and household appliances industry, it is estimated that the demand for stainless steel bellows in Asia will continue to grow. Experts in the industry pointed out that the central bank's policies have accelerated the transmission speed of market management, and the industry is becoming increasingly financial. Capital and inventory have become the two major joints of the stainless steel bellows market trend in the next step.