Performance characteristics of electric control valves
The electric control valve is composed of a combination of electric actuator and control valve, and its main features are:
1. Light weight and beautiful appearance.
2. Functionally, it can replace many products with incomplete functions, simplify the modeling, and solve the shortcomings of complex factory management, complex selection and large maintenance workload.
3. The adjustable ratio of the electric control valve is large, generally up to 100, and good adjustability can be guaranteed from 10% to 90% of the opening.
4. Stable action and high reliability, which can solve the fatal structural defects of traditional valves with large leakage.
5. Excellent on-off characteristics and zero leakage, which solves the fatal structural defect of traditional valves with large leakage.
6. Good ability to overcome differential pressure, anti-blocking function, simple flow path, non-resistance adjustment, large KV value, good "self-cleaning" performance.
7. The flow characteristics of the electric control valve are approximately equal percentages. The actual flow characteristics, because there is always a pressure difference between the front and back of the valve, the actual curve of the traditional control valve will have a large distortion but is relatively small, so it not only has good regulation performance, but also has good economy and energy saving.
8. Compared with the pneumatic control valve, the power supply for the electric control valve is convenient and economical, saving a series of troubles in establishing an air source station.
9. The electric adjustment mechanism has high precision, the degree of decomposition can reach 1/1000, the operating cost is low, and no maintenance is required.
10. According to the actual use environment, PTFE-lined ceramic ball valve or fully lined ceramic hard-sealed ball valve can be used to obtain higher corrosion resistance and wear resistance.
02
Performance characteristics of pneumatic control valves
The pneumatic control valve is composed of a combination of pneumatic actuator and control valve, and its main features are:
1. The extruded high-strength aluminum cylinder block has the inner surface of the cylinder body after fine grinding and hard anodizing, which has a long service life, low friction coefficient and fast action.
2. Beautiful, compact and modern shape, multi-specification series of products make the selection more economical.
3. All movable surfaces are made of high-quality bearings, with low friction, long life and no noise.
4. Two independent stroke adjustment mechanisms are installed externally, which is convenient for adjusting the ±5° fully open or fully closed position.
5. The piston and end cover are made of die-cast aluminum alloy, which has high strength and light weight.
6. Change the seal, which can be applied to high or low temperature occasions.
7. A variety of angular stroke and three-position pneumatic actuators can be provided according to needs.
8. The control is simple and intrinsically safe. No additional explosion protection measures are required.
9. However, its basic error and sensitivity are too low to be improved.
From the above, it can be seen that the basic error and sensitivity of the electric control valve reach 0.3%, and there is no need to establish a separate air source, and it is not suitable for occasions with high explosion-proof requirements. The basic error and sensitivity of the pneumatic control valve reach 0.5%, and the air source station must be established separately, but its intrinsic safety. It is suitable for occasions with high requirements for explosion protection.
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