However, because the default actuators and use is not the same as the supplementary material to stem valve performance is poor still can be summarized Outlines its law: 1, in the process there will make the process variable to leave dead area the way the original set point. Ha ha, so, this kind of valve the preset out is very poor, easily moved very large dead zones, the impact on the process of the deviation degree is obvious, it is a vote. So stem device output must increase to the sufficient to overcome dead zone, this is the only correct sexual action occurs. How to set a good locator? We know that we have, from the nature of his matter special must be a high gain device. The final result? Is to curb the valve performance on destroyers! (3), packing friction force is the main source of valve stem friction, the use of packing is different, lead to the friction has very big difference. At the same time has high static and dynamic gain high performance locator for no matter what a given valve components supply to reduce process deviation degree of the best overall performance. Various stem valve of sharp in the friction is different, such as rotary valve for the high friction load actuating the seat is very sharp, so use notice it a bit. The gain is composed of two local: static gain and dynamic gain. (1) the main factors influencing dead area. Get to the point. But for a little tightly closed type, high load in order to obtain closed ranks are sure to the seat. So far, is widely used in engineering is mainly the stem valve: solenoid valve and the electric valve. When doing maintenance is simple. (4), the type of actuator is different also influence on friction rooted disposition, for ordinary spring thin film actuator is better than piston actuator. Increase the static gain method is to preset a preamplifier. 2, the locator default problem. in normal use out of abrasion is difficult to avoid, but the abrasion of oil layer is one of the most interest, based on our empirical verify, lubricating oil circulation rotary valve only through hundreds of times, is almost the same lubricating oil layer can use (bristle brush Exaggerated point, or writing is annoyed) 。 Second, how to solve the problem of the worse performance of valve stem whether still electric valve solenoid valve, scale pay can lead to valve leakage, serious when even will affect the normal office of the valve, so how to eliminate the influence of scale, has been watching people widespread concern of the industry. Nowadays people have been using disposal device to set the locator. 。 For example - nozzle - Baffle device. Q: stem valve performance testing and repair protect aftercare answer: a, pressure stem valve selection problem: more please click into the valve selection knowledge: valve type selection. Look like the Industrial Valves will also speak to say let's back where he has broken down. (2) the abrasion. Then a friend to ask how dynamic gain? Is through a power amplifier, obtained the power amplifier is slide valve ( Ordinary) 。 From the default of thinking at first, actuator and positioner preset must ponder question together. Friction, shifting, valve shaft turn, amplifier dead zone. But they are lacking in use, such as solenoid valve easy by foreign body congestion, water resistance is big, must be a long period of personnel protection, etc. ; And electric Industrial Valves is no water resistance, but because of should be indispensable to stem a circuit, so that the water vapor denudation affect the survival of the fixed number of year is besieged and promote the main asked Marine valve problem. Additional actuating pressure load will guide meticulous precision seal wear, these are main factors causing friction increases. Stem process to involve valve range really too wide, can't give you implies white one by one in this place, related to this aspect of internal substance also himself personally to check information. Notes to the order: The national standard) A, A: B: product name, model, nominal size medium and temperature, pressure range C: whether there is attachment, delivery time, and special requirements so that we can correct selection for you. Second, if the valve has been selected by design unit of our company model, please order according to the valves parameters directly with our sales center. Three, it is very important when you use the occasion or the environment is more complex, would you please provide design drawings and detailed parameters, our engineers experts will concentrate on review and analysis for you. We can provide you with professional solutions, including design, customization, complete, operation and service. We've been working on the valve leader in the field of industry, to provide you with the latest knowledge of the valve, the best service, best technical adviser. Thank you for visiting our website, if you have any questions, you can call us, we will be dedicated to provide you with quality services. 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