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Electric valve is simply with electric actuator control valve, so as to achieve the valve open and close. It can be divided into two parts, the upper half is divided into electric actuator, the lower half is divided into valve.
Principle: Electric valve is usually connected by electric actuator and valve, after installation and debugging. The electric valve uses electricity as power to connect the electric actuator to drive the valve and realize the switching and adjustment action of the valve. So as to achieve the switch or adjustment of the pipe medium.
Solenoid valve is a type of electric valve; it is the use of the magnetic field to pull the stem, so as to change the body of the body, coil power, the stem depends on the pressure of the spring back.
Overcome the impact of scale on the use of valves: whether it is a solenoid valve or an electric valve, scale will not only cause valve leakage, serious will even affect the normal work of the valve, so how to eliminate the impact of scale, has been a common concern in the industry.
The solenoid valve process involves too wide range, but due to the different design actuator and the use of filling materials, the poor performance of the control valve can be summarized as its law.
1、The presence of dead areas in the process deviates the process variable from the original set point. So the output of the controller must be increased enough to overcome the dead area, and only this corrective action will occur.
2、①The main factors affecting the dead area: friction, swimming, valve shaft torsion, the dead area of the amplifier. Various control valves are not as sensitive to friction, for example, the rotary valve is very sensitive to the friction caused by the high valve seat load, so this is noted when using. But for some sealed types, a high seat load is necessary to obtain a closing level., In this way, the valve design is very poor, easy to cause a large dead area, which affects the process deviation degree is obvious, it is simply decisive.
②wear and tear. Valve in the normal use of wear is inevitable, but the wear of the lubrication layer is the most severe, according to the experiment, the lubrication rotary valve only after a few hundreds of cycles, the lubrication layer can almost be used just brush. In addition, pressure-induced loads can also lead to the wear of the sealing layer, which are the main factors that increase the friction force. The results give a devastating control valve performance.
③Filler friction is the main source of control valve friction, the use of different packing, causing the friction is very different.Filler friction is the main source of control valve friction, the use of different packing, causing the friction is very different.
④Different types of actuators also have a fundamental impact on the friction force. Generally speaking, the spring film actuator is better than the piston actuator.
Locator design problem: 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 features, it has to be a high-gain device. The gain is composed of two parts: static gain and dynamic gain. The way to improve the static gain is to design a preamplifier. For example, the nozzle- -the baffle device. So a friend should ask how to get the dynamic gain? It was obtained through a power amplifier, which is a sliding valve. Someone already uses the microprocessor to set up the locator. It looks like the valve will tell us where he broke. At that time, the maintenance thing was very simple. Let us get to the point. High performance locators with both high static and high dynamic gain can provide the best overall Application: canning / canning system; beer brewing and beverage technology; electric valves; chemical industry; fluid mixing device; food industry concrete and cement industry; vacuum technology; water treatment device; pneumatic equipment; laundry room; medical equipment; boiler water supply; process control;
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July 28, 2022
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