The performance of valves

Strength properties

     The intensity of the performance of the valve is the valve's ability to bear the pressure medium. Valve is under pressure of mechanical products, which must have sufficient strength and rigidity to ensure the long-term use without cracking or deformation occurred.

Sealing performance

     Sealing performance of the valve means of the sealed parts of the valve to prevent leakage of the ability of media, it is the most important technology valve performance. Sealing valve has three parts: sluicegate two pieces with the valve seat sealing surface contact between the Department; fill with the stem and fill with the letter and the Department; the valve cover and valve body junction. The first one is called the leak within the leak, which is usually lax customs said that it will affect the media's ability to cut-off valve. The cut-off valve type, the internal leakage is not allowed. Leakage after the two called the leakage, that leakage of media from the valve to the valves. Leakage would cause material loss, pollution of the environment, it will result in serious accidents. The inflammable, explosive, toxic or radioactive medium is allowed to leak, so the valve must have a reliable sealing performance.

Mobile media

     After the medium flow through the valve will be pressure loss (both before and after the valve pressure difference), that is, the flow valve on the media have a certain resistance, medium resistance to overcome the valve is necessary to a certain degree of energy consumption. From energy conservation considerations, the design and manufacture of valves, the valves to minimize the resistance to the flow of media.

Torque and headstock headstock

     Headstock and headstock is the moment to open or close the valve must be imposed by force or torque. Close the valve, the need to hoist the two pieces with the fat seat sealing surface to form a seal between the pressure, but also to overcome the stem and the packing between the stem and between the threaded nut, stem end bearing Department and other parts of the friction force of friction, which must exert a certain degree of closure and the closure of torque, valves in the gate process, the required torque headstock and headstock is changing, and its maximum is in the final closure of the instantaneous or open the initial transient. The design and manufacture of valves should be sought to reduce the closing force and closing torque.

Hoist speed

     The speed of the valve gate is open or closed to complete a move to indicate the time required. The general speed of the gate valve without strict requirements, but some conditions the speed of the headstock there are special requirements, if the request to open or close rapidly to prevent accidents, and some require a slow shut down to prevent water hammer and other produce , which in the selection of valve type should be taken into account.

Sensitivity and reliability of action

     This refers to changes in medium parameters for the valve, corresponding to the sensitivity of the reaction. The throttle valve, relief valve, control valve used to adjust the dielectric parameters, such as valves and safety valves, steam trap with a specific function, such as valves, the sensitivity and reliability of its functions are very important indicators of technical performance.

Life

     It said that the durability of the valve is an important performance indicator valves, and has great economic significance. Usually sealed to ensure that the number of required headstock that can also be used to indicate the use of time. valve ball valve gate valve check valve globe valve butterfly valve
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