Choose pneumatic valve must pay attention to the technical performance

and sealing performance. Pneumatic valve pneumatic valve sealing performance refers to the ability of the sealing parts prevent leakage of medium, it is the most important technical performance index of the pneumatic valve. Pneumatic valve sealing part three: opening and closing parts and pneumatic seat the contact point between the two sealing surface; Packing and pneumatic valve stem and gland and blending; The joint of pneumatic valve and pneumatic valve cover. One former place called internal leakage of leakage, known as the closed lax, it will affects the ability of the pneumatic valve block medium. For truncation of pneumatic valve, leakage is not allowed. After the two called the leakage of leakage, the medium from the pneumatic valve leakage to the outside of the pneumatic valve. Leakage would cause material loss, environmental pollution, serious when still can cause accidents. For flammable and explosive, toxic or radioactive medium, leakage is not allowed, so pneumatic valves must have a reliable sealing performance.
and mobile media. After the medium flows through the pneumatic valve can produce the pressure difference between before and after, make the pneumatic valve has a certain resistance to the flow of medium, medium to overcome the resistance of the pneumatic valve will consume a certain amount of energy, so the design and manufacture of pneumatic valves, pneumatic valves as far as possible to reduce the flow medium resistance, reduce energy consumption.
and open/close force and torque. Open/close force and open-close torque is refers to the pneumatic valve is opened or closed must be imposed by force or torque. Close the pneumatic valve, the need to make the open-close part and send a form a seal between the two sealing surface pressure, but also overcome the friction pneumatic valve stem and other parts of the friction, thus, pneumatic valves in the process of opening and closing, must exert closing force and close moment, so the design and manufacture of pneumatic valve should strive to reduce the closing force and close moment.
, opening and closing speed. Opening and closing speed with pneumatic valve opening or closing a finish time required. The general pneumatic valve opening and closing speed without strict requirements, but some of the operating mode of opening and closing speed have special requirements, such as some requirements quickly turned on or off, in case of an accident, slowly closing some requirements, to prevent to produce water hammer, etc. , it should be taken into consideration when selecting pneumatic valve type.
and service life. It is said the durable degree of pneumatic valve, pneumatic valve is one of the important performance index, and has great economic significance. Usually to ensure the sealing requirements of opening and closing times, use time can also be used to say.