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The main factor affecting the solenoid valve dead zone. Friction, wandering, shaft twisting, amplifier dead zone. Various control valves are sensitive to friction. For example, rotary valves are very sensitive to the friction caused by high seat loads, so notice this when using them. However, for some types of seals, high seat loads are required to achieve a closed rating. In this way, the design of this valve is very poor, easy to cause a lot of dead zone, the impact of the process of deviation is obvious, it is decisive. Wear and tear It is inevitable that the control valve will wear when it is used normally, but the abrasion of the lubricating layer is the most powerful. In addition, the stress caused by the load will lead to the sealing layer of wear and tear, these are the main factors leading to increased friction. The result is a devastating effect on the performance of the control valve. Filler friction is the primary source of friction for the control valve. Friction forces vary widely depending on the packing used. The different types of actuators also have a fundamental effect on friction, and in general the spring film actuator is better than the piston actuator. Commonly used in the current project control valves are: solenoid valves and electric valves. However, they all have defects in use, for example, the electromagnetic valve is easy to be blocked by foreign matter, the water resistance is large, and the manpower must be maintained for a long time. The electric valve has no water resistance, but due to the necessary control circuit, Affect the service life is also plagued the main issue of promotion. Locator design issues From the initial thinking of the design, the actuator and locator design must be considered together. How to design a good locator? From his important characteristics to know, must be a high gain device. Its gain is made up of two parts: static gain and dynamic gain. The way to increase the static gain is to design a preamplifier. Such as a nozzle baffle device. Then a friend to ask how dynamic gain? Through a power amplifier is obtained, the power amplifier is a spool valve (general). High performance locators with high static and dynamic gain at the same time provide the best overall performance for any given control valve assembly in reducing process variability. How to minimize the impact of scale on the use of regulating valve Whether it is a solenoid valve or electric valve, scale will not only cause the valve leakage, even in severe cases will affect the normal operation of the control valve, so how to eliminate the impact of scale, is the industry Common concerns. Control valve technology to be involved in the scope is too wide, you can not be here one by one to make it clear, I hope this content also personally check the information. However, due to the design of implementing agencies and the use of different filler material control valve performance is poor or can be summed up in its law: the presence of dead zones in the process will make the process variables deviate from the original set point. So the output of the controller must be increased enough to overcome the dead zone, and only this corrective action will take place. Solenoid valve steam solenoid valve water solenoid valve
September 23, 2021