is control unit in the pipeline fluid conveying system, it is used to change the channel cross-section and flow direction of medium, a diversion, globe, adjust, throttle, check, or the overflow pressure relief, and other functions. Used for fluid control valve, from the most simple cut-off valve to extremely complex automatic control system used in all kinds of valves, its breed and specification is various, nominal size of the valve from the tiny instrument valve to size up to 10 m industrial pipe with a valve. can be used to control water, steam, oil, gas, mud, all kinds of corrosive medium, liquid metal fluid flow, and radioactive fluid and so on various types of valve working pressure can be from 0. Ultra-high pressure 0013 mpa to 1000 mpa, from operating temperature Ultra-low temperature of 269 ℃ to 1430 ℃ high temperature. control can use a variety of transmission way, such as manual, electric, hydraulic, pneumatic, worm gear, electromagnetic actuator, electromagnetic, hydraulic, electric, hydraulic, pneumatic, hydraulic, spur gear, bevel gear drive, etc. ; In pressure, temperature or other form under the action of sensor signals, action, according to the requirement of the reservation or not depend on the sensor signals and for simple opening or closing, the valve in accordance with * drive or automatic institutions make open-close part for lifting, sliding, rotary pendulum or rotary movement, so as to change the size of the port in order to realize the control function. 1. The strength of the strength performance of the valve performance is the ability to under medium pressure valve. Within the valve is under pressure of mechanical products, and therefore must have sufficient strength and rigidity, so as to ensure the long-term use without cracking or deformation. 2. sealing performance of 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 valve. sealing part three: open-close part and seat the contact point between the two sealing surface; Packing match and with the stem and packing gland; The joint of the body and bonnet. One former place called internal leakage of leakage, known as the closed lax, it will affect the valve truncation medium capacity. For block valve type, the internal leakage is not allowed. After the two called the leakage of leakage, the medium from leaking to the outside of the valve from the 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 the valve must be * sealing performance. 3. After the flow properties of medium flow through the valve will generate pressure loss ( Both before and after the valve pressure difference) , that is, the valve has a certain resistance to the flow of medium, medium to overcome the resistance of the valve will consume a certain amount of energy. From the consideration on the energy saving, design and manufacture of valves, to reduce the resistance of valve for liquid medium as much as possible. 4. Action 1) performance 。 Action sensitivity and can be * this refers to the valve for medium parameters change, make corresponding response sensitivity. For throttle valve, relief valve, regulating valve used for adjusting the parameters of the medium, such as valve and relief valve, steam trap valve has a specific function, it is important to its function and sensitivity can be * technical performance indicators. 2) 。 Open/close force and open-close torque force and open-close torque is refers to the opening and closing valve is opened or closed must be imposed by force or torque. Close the valve, the need to make the open-close part and send a form a seal between the two sealing surface pressure, but also overcome between stem and packing, the valve stem and between threads of the nut, valve rod end bearing friction and other parts of the friction force, and therefore must exert closing force and close moment, in the process of opening and closing, the valve is required for opening and closing force and the open-close torque changes, its maximum is in the closed end transient or open the initial transient. Design and manufacture of valves should strive to reduce the closing force and close moment. In this paper, the keyword search: the valve
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