According to the different connection form with the pipeline, it can be roughly divided into flange pneumatic ball valve, threaded pneumatic ball valve, welding pneumatic ball valve, ferrule pneumatic ball valve, etc. If other factors are not considered, but depending on the connection method, if the diameter of the low-pressure pipeline is less than DN100, the sealing requirements are not very strict, and the threaded pneumatic ball valve is mostly used for thread installation, Welded pneumatic ball valves are generally used for buried pipelines and do not require frequent disassembly and replacement. Flange pneumatic ball valves are generally selected for those with strict sealing requirements that need frequent replacement. Threaded pneumatic ball valve and flange pneumatic ball valve are mostly used in low-pressure pipeline, and welding pneumatic ball valve and flange pneumatic ball valve are more used in high-pressure environment. If the installation distance is small, the wafer type pneumatic ball valve is used. This pneumatic ball valve has the shortest installation distance and is relatively cheap. From the structural form, it is used for on-off shut-off valve, mostly floating pneumatic ball valve and fixed pneumatic ball valve. The fixed pneumatic ball valve is generally selected when the pressure is lower than PN100 and the nominal diameter is lower than DN200, but only the fixed pneumatic ball valve can be selected when the nominal diameter is lower than DN50. The structure with the nominal diameter lower than DN50 is too small to install the upper and lower valve stems. When the pressure is greater than PN100, the fixed pneumatic ball valve is mostly used. If the pressure is too high, the floating pneumatic ball valve structure is easy to damage the sealing surface under the action of the medium pressure, so the sealing of the pneumatic ball valve is invalid. Moreover, the floating pneumatic ball valve requires the pneumatic ball valve to move to the valve seat in a small range under the medium pressure to form a seal. The valve stem torque is too large, which is very inconvenient to open. Eccentric semi pneumatic ball valves are often used in large low-pressure pipelines. The eccentric semi pneumatic ball valve is similar to the three eccentric hard seal pneumatic ball valve in structure. Only 1/4 of the spherical surface forms a seal with the valve seat, which is very light in weight and low in price. The spherical surface and the valve seat form a shear force, which can cut the long fibers in the water medium. V-type pneumatic ball valve is a pneumatic ball valve used for flow regulation, and displacement in the pneumatic ball valve can be used for flow regulation.

About the use of stainless steel pneumatic butterfly valve
Application of stainless steel pneumatic butterfly valve: used for maintenance of signal wires, transmission wires and cables, optical fiber cables of various equipment. Applicable to four categories of products:
1. Wire maintenance tubes for armored optical cables, fine optical rulers, optical measuring instruments, medical instruments, machinery and equipment;
2. Applicable to public telephones, remote water meters, door magnetic alarms and other equipment that need to stop safety protection for wires;
3. Maintenance tubes for various small wires;
4. Network cable maintenance management for various computers, robots, etc.
The manufacturer of pneumatic butterfly valve reminds us to pay attention to the attack of cold
Today's weather can be said to be erratic. I don't know when the weather will be cool and when it will be particularly hot. This season is also the climax of colds. The manufacturer of pneumatic butterfly valve reminds you to pay attention to colds. The manufacturer of pneumatic butterfly valve will tell you some tips to prevent colds: as the saying goes, "food is better than medicine", Using food to prevent colds is the best prevention measure, which is also very popular. Some friends take medicine more laborious, so Xiaobian won't let you take medicine. Eating more food can prevent colds.
Diet: It should be greasy, to prevent greasy, spicy and raw cold; Eat more fresh fruits and vegetables, and keep your stool smooth; Home cooking of mung bean porridge, lotus seed and lily porridge, lotus leaf porridge, red jujube porridge can prevent heatstroke; Drink more water and eat less health products.
Living: Traditional Chinese medicine believes that staying up late is easy to hurt the spirit and qi, so it is important to ensure adequate sleep in summer nights; Wear clothes according to the temperature; The room shall be equipped with air conditioning and ventilation interchangeability.
Exercise: It is better to separate work and leisure, and avoid excessive physical exertion. Old friends should take a walk at dusk as their first choice.
In addition, it is better not to enjoy the cool at night in summer, let alone sit in a humid center. Because colds can also be transmitted by hand contact, it is also important to pay attention to personal hygiene.
Watermelon and tomato juice for summer colds
Ingredients: appropriate amount of watermelon and tomato.
Preparation method: take the dipper from the watermelon, remove the seeds, and wring the juice with gauze; Tomatoes are scalded, peeled, seeded, and squeezed with gauze. Then the second juice is merged and used as a substitute for tea.
Some foreign scholars take vitamin C tablets in the cold omen period or use vitamin C nasal drops to prevent colds, and have also achieved good results. Therefore, various vegetables and fruits rich in vitamin C can be said to be natural medicines to prevent colds.
Eating more seafood rich in zinc, such as oysters, is also good for regulating the cellular immune state of the body to prevent colds.
Honey, especially royal jelly honey rich in royal jelly, contains bioactive substances, which can stimulate immunity in whole or in part, strengthen the phagocytosis of neutral leukocytes and macrophages, and improve the body's resistance to external pathogens. People who insist on eating honey 2-3 times a day (about 30g each time) can improve their resistance to viral infection by 3 to 4 times, and are not easy to catch cold. For patients with colds and other viral diseases, honey is also conducive to recovery.