The sight glass refers to the device used to observe the materials inside the container and equipment. It is a safety accessory and should be checked regularly. According to the shape, it is divided in o circular and rectangular mirrors. According to the purpose, it can be divided in o peeping and lighting mirrors. According to the structure, it is divided in o mirrors with lining and without lining, with neck, with cover, double-layer safety, heat preservation, with scraper, with washing device and mirrors suitable for powdery materials.
There are mainly two views on the working principle of flame arresters: one is based on heat transfer; One is based on the wall effect.
Heat transfer effect
One of the necessary conditions for combustion is to reach a certain temperature, that is, ignition point. Below the ignition point, the combustion will stop. According to this principle, the spread of flame can be prevented as long as the temperature of the burning substance is reduced below its ignition point. When the flame passes through many small channels of the fire arresting element, it will become several small flames. When designing the fire arresting element inside the flame arrester, expand the contact area between the small flame and the channel wall as much as possible, strengthen heat transfer, and reduce the flame temperature below the ignition point, so as to prevent the flame from spreading.
Combustion and explosion are not direct reactions between molecules, but are excited by external energy. Molecular bonds are destroyed to produce activated molecules. The activated molecules split in o short-lived but very active free radicals. The free radicals collide with other molecules to produce new products. At the same time, they also produce new free radicals and continue to react with other molecules. When the combustible gas passes through the narrow channel of the fire retardant element, the collision probability between free radicals and the channel wall increases, and the free radicals participating in the reaction decrease. When the channel of the flame arrester is narrow to a certain extent, the collision between free radicals and the channel wall is dominant. Due to the sharp reduction of the number of free radicals, the reaction cannot continue, that is, the combustion reaction cannot continue to spread through the flame arrester.
With the reduction of the size of the flame arrester channel, the collision probability between free radicals and reactive molecules decreases, while the collision probability between free radicals and the channel wall increases, which promotes the reduction of free radical reaction. When the channel size is reduced to a certain value, this wall effect causes the condition that the flame cannot continue to propagate, and the flame is stopped. Therefore, the wall effect is the main mechanism to prevent flame
The maintenance of breather valve shall be conducted once a month and twice a month in winter. Its method: first open the valve cover gently, take out the vacuum valve disc and pressure valve disc, and check whether the sealing place of the valve disc and the valve disc, and the guide rod and guide rod sleeve of the valve disc are free of oil and dirt. If there is oil and dirt, clean it up, then install it back in place, pull it up and down a few times, and check whether the opening is flexible and reliable. If everything is normal, cover and tighten the valve cover. During the maintenance, if the valve disc is found to be scratched, worn and other abnormal phenomena, it should be replaced immediately or contact the supplier company to solve them in time.
1. It is very important to remove the package and read the product description.
2. When lifting the breather valve, appropriate lifting tools should be selected to avoid damaging the protective cap of the breather valve disc.
3. Check the coaxiality and verticality of the pipe flange on the tank or water tank, which is very important for the normal use of the pressure vacuum relief valve (breather valve).
4. Check the water line surface of the pipe flange on the tank or water tank. It must be clean, free from scratches, corrosion, tool marks, and flat.
5. Remove the flange port protective cover and other packaging materials.
6. Check the gasket; Ensure that the material is suitable for the application.
7. Use the bolt circle to center the washer.