Selection of control valve should pay attention to the problem
Classification:
Release Time：2017-12-25
1. Regulating function ① requires the regulating valve to act smoothly; ② small opening adjustment performance is good; ③ select the required flow characteristics; ④ meet the adjustable ratio; ⑤ small resistance and large flow ratio (ratio of rated flow parameters of regulating valve to nominal diameter);⑥ adjust speed. 2, leakage and cut-off pressure difference This is an inseparable, interrelated two factors. Leakage should meet the process requirements, and the reliability of the sealing surface of the protection measures; cut off the pressure must be put forward, so that the selected control valve has enough output force to overcome it, otherwise it will lead to the implementation of the agency to choose large or small. 3, anti-blocking even clean media, there is also a blockage problem, this is
1. Adjustment function
① requires the control valve to act smoothly; ② small opening adjustment performance is good; ③ select the required flow characteristics; ④ meet the adjustable ratio; ⑤ small resistance, flow ratio (control valve rated flow parameters and nominal diameter ratio);⑥ adjust the speed.
2. Leakage and cut-off pressure difference
These are two inseparable and interrelated factors. Leakage should meet the process requirements, and the reliability of the sealing surface of the protection measures; cut off the pressure must be put forward, so that the selected control valve has enough output force to overcome it, otherwise it will lead to the implementation of the agency to choose large or small.
3. Anti-blocking
Even if it is a clean medium, there is also a blockage problem. This is the unclean things in the pipeline that are caused by the medium in the regulating valve. This is a common fault, so the anti-blocking performance of the regulating valve should be considered. Generally, the angle stroke type of regulating valve is much better than the anti-blocking performance of the straight stroke type of regulating valve, so the use of the angle stroke type of regulating valve will be more and more.
4. Corrosion resistance
It includes resistance to erosion, cavitation and corrosion. Mainly related to the selection of materials and the service life of the valve, at the same time, related to economic issues. The essence of this problem should be the selected valve has good corrosion resistance and reasonable price.
5. Pressure and temperature resistance
This involves the nominal pressure of the regulating valve, the selected operating temperature. In terms of pressure resistance, it is not difficult if the pressure is only high, mainly cavitation is generated by the pressure difference assembly. In terms of temperature resistance, it is usually very easy to solve the problem below 450 ℃, and it is not difficult to 450~600 ℃, but when it is above 600 ℃, the contradiction will be prominent. When the temperature is 80 ℃, it is usually not advisable to use soft sealing materials for cut-off valves, and hard seal cutting should be considered.
6. Weight and appearance
This problem is very intuitive, it must be good appearance, light weight control valve by the use of manufacturers welcome. Here to change a prejudice, that the regulator is a "boss rough", heavy or appearance almost nothing great. Now we attach great importance to it, so that the control valve should have the characteristics of miniaturization, light, instrumentation.
Previous Page
Next Page
Related News
2026/02/28
Contact Information
+86 27-8970 8339
Address: No.5, Zhengjie, Shuangliu Street, Xinzhou District, Wuhan City, Hubei Province