Do you know why large diameter valve switch is very difficult, have a solution?

Valve control device is commonly used in industrial production, chemical water pump installation, pipeline connection, flow control equipment, the basic with the valve, the user know when using the valve, the valve switch more difficult, if you don't want to some way to switch directly with the hand, the really hassle, sometimes not sealed can also lead to a leak, so on the question of large diameter valve switch have good method? In daily use of large diameter valve user, namely large diameter globe valve for pressure difference larger medium, such as steam, high pressure water pressure at work, it is often difficult to shut down, no matter how hard to shut down, always find that there will be a leak phenomenon, it is difficult to shut, the cause of this problem is by the valve structure design and the limit of the people level caused by insufficient output torque. A cause analysis to difficulty, large diameter valves switches may limit the output power for 60 - adult level In terms of 90 kg, depending on the different constitution. Generally higher than that of the flow of cut-off valve is designed for low into, when people to close the valve, the body horizontal push hand wheel rotation, downward movement, the valve closed, then need to overcome the combination of three aspects of force, namely: 1. Top of axial thrust Fa; 2. Packing and the valve stem friction Fb; 3. The valve stem and valve core Fc contact friction torque total & sum; M = ( 足总+ Fb + Fc) R can be seen that the larger the diameter, the axial thrust is, the greater the when nearly closed state, to the top of the axial thrust almost close to the actual pressure ( P1 - due to closing P2≈ P1, P2 = 0) As a globe valve for 10 DN200 diameter bar on the steam pipe, its only the first close to the top of the axial thrust Fa = 10 & times; π R2 = 3140 kg, and close the required level of circumferential force is close to the limit of the normal human body can output level circumferential force, so by a person in this condition completely closed the valve is very difficult. Advice, of course, some factories will reverse installation, this kind of valve can solve the problem of difficult to close, but I can't open again is turned off. 2, large diameter valve easy to appear in the analysis of the causes of leakage of large diameter valve commonly used in exports, the main points of cylinder, steam boiler, head position, such as the position the following problems: 1, general the big diameter pipeline opens, all need to preheat pipelines, general requirement is small steam flow through the preheating process, uniform line slowly heated to a certain extent, to completely open the cut-off valve, avoid to cause pipeline rapid heating up, resulting in excessive inflation, damaged part of the connection parts. But in this process, the valve opening is often very small, resulting in the erosion rate is much greater than normal use effect, severely reduces the service life of the valve sealing surface. 2, the boiler outlet pressure difference compared commonly big, so the steam flow rate is bigger, the sealing surface erosion damage is bigger also. Other boiler combustion efficiency for 100%, this will cause of the steam boiler outlet water content is larger, easy on the valve sealing surface cavitation and cavitation damage. 3, the export of boiler and cylinder near the cut-off valve, because just came out from the boiler steam, with intermittent overheating occurs, in the process of the saturated, if the boiler water softening treatment is not too good, tend to precipitate part of acid and alkali substances, the sealing surface can cause corrosion and erosion; There are also some crystallizable substance may also be attached to the valve sealing surface crystallization, lead to valve cannot be hermetically sealed. 4, import and export of cylinder valves, because after the valve steam consumption due to reasons such as production requirements YongQiLiang age small, in the case of velocity change is bigger, is easy to produce the phenomenon such as flashing, cavitation, and cause the valve sealing surface erosion and cavitation damage. Three, large diameter valve switch difficult solution 1, the first advised to choose a bellows seal globe valve, avoiding the plunger valve, filler valve frictional resistance, switch more easily. 2, the valve core seat must choose good erosion resistance and abrasion resistance of material; 3, recommended double disc structure, not excessive erosion caused by small open degree, affect the service life and the sealing effect.
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