Industry new

Imported electric valve use _ electric valve features _ electric valve conventional problems

The use of electric valve:

Motorized valves for analog adjustment of pipe media flow in liquid, gas and wind systems are AI controlled. In the control of large valves and wind systems, electric valves can also be used for two-position switch control. There can be AI feedback signals, which can be controlled by DO or AO, and are found in large pipes and dampers. The application fields of electric valves are: canned / bottle system, beer brewing and beverage technology chemical industry, fluid mixing device, food industry concrete and cement industry, vacuum technology, water treatment device, pneumatic device, laundry room, medical equipment, boiler Water supply, process control and other fields.

Features:

1. It can meet the requirements of most working conditions and the working conditions that ordinary valves can not be used;

2, with switch and adjustment function, with valve position indication and output;

3, suitable for almost all media, viscosity up to 600mm2 / s (centimeter);

4, high temperature resistance, chemical corrosion resistance, wear resistance and durability, water hammer impact;

5, comes with manual function, can be equipped with hand wheel type, explosion-proof environment actuator can be equipped with explosion-proof type;

6, two-way circulation, simple operation, stable control and long service life.

common problem:

Overcome scale

Whether it is a solenoid valve or an electric valve, scale will not only cause valve leakage, but also affect the normal operation of the valve in severe cases, so how to eliminate the impact of scale is a common concern in the industry.

The scope of the solenoid valve process is too wide, but the performance of the control valve can be summarized due to the difference in design actuators and the use of filler materials.

1. The presence of a dead zone during the process will cause the process variable to deviate from the original set point. Therefore, the output of the controller must be increased enough to overcome the dead zone, and only this corrective action will occur.

2, 1 The main factors affecting the dead zone: friction, migration, valve shaft torsion, dead zone of the amplifier. Various control valves are not sensitive to friction. For example, rotary valves are very sensitive to friction caused by high seat loads, so note this when using them. However, for some seal types, a high seat load is necessary to achieve a shutdown rating. In this way, the design of the valve is very poor, and it is easy to cause a large dead zone. The influence of the process deviation is obvious and it is decisive.

2 wear. It is inevitable that the valve will wear out during normal use, but the wear of the lubricating layer is the most powerful. According to the experiment, the lubrication rotary valve only passes through several hundred cycles, and the lubricating layer can be used almost as a brush. In addition, the load caused by the pressure can also cause the wear of the sealing layer, which is the main factor that causes the friction to increase. The result? Is the performance of the control valve devastating!

3The friction of the packing is the main source of the friction of the control valve. The friction used is different, and the friction caused by the packing is very different.

4 Different types of actuators also have a fundamental impact on friction. In general, spring diaphragm actuators are better than piston actuators.

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