Pneumatic valve life and sealing performance

sealing performance

pneumatic valve sealing performance refers to the sealing parts of pneumatic valve's ability to 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, pneumatic valve leakage is not allowed, so must have a reliable sealing performance

flow medium

medium flows through the pneumatic valve will generate pressure loss (after Both before and after pneumatic valve pressure difference, that is, 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. From the consideration on the energy saving, design and manufacture of pneumatic valves, pneumatic valves as far as possible to reduce the resistance of flow medium

opening and closing force and open-close moment

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 pneumatic valve, pneumatic valve stem between stem and packing with the threads of the nut, pneumatic valve rod end bearing friction and other parts of the friction force, and therefore must exert closing force and close moment, pneumatic valves in the process of opening and closing, the need of opening and closing force and open-close moment is changing, transient or open its maximum is in the closed end of the initial transient. Design and manufacture of pneumatic valves should strive to reduce the closing force and close moment.

opening and closing speed

opening and closing speed with pneumatic valves are required to complete an opening or closing action time. 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.

action sensitivity and reliability of the

this is pneumatic valves for medium parameters change, make corresponding response sensitivity. For throttling pneumatic valve, relief valve, pneumatic valve adjustment used for adjusting the parameters of the medium of the pneumatic valve and safety valve, pneumatic valve with specific functions such as hydrophobic pneumatic valves, its function and reliability sensitivity is an important technical performance index. The service life of the



it said the durable degree of pneumatic valve, pneumatic valve is one of the important performance indicators, and has great economic significance. Usually to ensure the sealing requirements of opening and closing times, use time can also be used to say.