There are several large cartons in the warehouse of the Public Security Brigade’s Public Security Brigade Office, which contains prohibited items carried by some subway passengers that have been collected since more than six months. According to statistics, in 2014, a total of 140 million subway security inspections were packaged, of which more than 20,000 were found to be prohibited goods. With the increase in public awareness of safety, the number of people taking subways carrying contraband products has shown a declining trend. At noon on the 16th, the reporter went to the Public Security Bureau’s security brigade’s office. In a small warehouse next to the office, several large cardboard boxes were placed. These cartons contained various types of contraband on the subway, although each box had no Filling, but a few dozens of knives and a few dozen shockers are shocking. “You see, the light control tool has a small half box. These knifes are surely not allowed to be taken to the subway. Some of the passengers said they are carrying a fruit knife, but we recommend that you don’t try to bring such a knife when you go out. On the body, if you must bring a fruit knife to the subway, then you must ensure the integrity of the package.†The police of the public security branch of the Public Security Bureau said, “Inflammable materials like arresters, artificial guns, portable oxygen, and excessive amount of mosquito repellent, etc. Can't bring the subway." It is understood that the Xi’an Metro began to implement security inspections in September 2013. In 2014, the total number of subway security inspection instruments passed through 140 million, and more than 21,000 items of prohibited goods were discovered, of which nearly 3,000 were handed over to public security agencies. With the improvement of public awareness of safety, subway passengers carrying prohibited goods entering the station have shown a significant downward trend over the past year or so. On the afternoon of the 16th, the reporter went to the administrative center station of Xi'an Metro Line 2. A reporter at the security inspection office noticed that almost all passengers can actively cooperate with security inspections. "Our security inspectors must undergo at least one week's training before taking up posts. The contraband can be recognized almost instantly. Therefore, passengers should not carry the contraband on the subway with a lucky flair." A staff member responsible for subway security cautioned passengers . The Public Security Bureau’s Public Security Brigade’s police cautioned that passengers must not carry contraband when they ride on the subway. This may not only harm other passengers, but may also cause unnecessary trouble for their travel. Check Valve is usually used for stopping back flow of medium. Check Valve Check Valve,Brass Check Valve,Spring Check Valve,Water Check Valve Ningbo Jiekelong Precision Manufacturing Co., Ltd. , http://www.jklvalve.com
The maximum permissible leakage of the check valve with non-metal elastic seals is zero, and that of the check valve with meal seals is 0.1xDNmm3/s. Therefore, QC passed valves with metal seals possibly have slight leakage. Hence, in the applications where check valves must not have any leakage, non-return valves with soft seals should be used.
Nominal pressure of Brass Check Valve is 1.6MPa and medium temperature for metal seal is -20℃~150℃, and medium temperature for non-metal seal is -20℃~100℃. When the non-return valve is used for saturated steam, the pressure of the saturated steam should be≤0.6MPa.