Valve caliber selection factor description
The flow path area of ​​the valve is directly related to the flow rate and flow rate, while the flow rate and flow rate are two quantities that are interdependent. However, when the flow rate is constant, the flow rate is large, the flow rate is large, the flow path area can be smaller, the flow rate is small, and the flow path area can be capitalized. On the contrary, the slip area is large, the gas flow rate is small, the flow path area is small, and the gas flow rate is large. The flow rate of the medium is large, the valve statistics can be smaller, but the resistance will be very large, so the valve is prone to problems. If the flow rate is large, it is easy to generate static electricity, which is very dangerous to the medium that is flammable and explosive. The flow rate is small, so the time will be more and it is uneconomical. For media that are viscous or flammable, use a small flow path valve. Pipeline flow is basically determinable, but the flow rate is determined by the experience of the engineer. The flow rate of each medium will also have a detailed table description. The flow rate and flow rate can be used to calculate the diameter of the valve to be used. If the valve diameter is the same, then the type of structure is different, the resistance of the fluid is also different. In the same environment, the greater the resistance of the valve body, the smaller the flow rate of the fluid passing through the valve, the smaller the valve resistance, the greater the flow of fluid through the valve. Among all types of valves, the resistance of the gate valve is relatively small, only between .01 and 1.5. Of course, if the diameter of the gate valve is relatively large, the resistance is between 0.2 and 0.5. The trapped gate valve has a relatively large resistance. The resistance of the shut-off valve will be larger than that of the gate valve, generally between 4 and 7. The resistance of the Y-type stop valve is small, between 1.5 and 2. Forged steel stop valve resistance is large, and sometimes it can reach 8. The resistance of the check valve is determined according to different structures: the swing check valve is usually 0.8~2, and the resistance of the multi-lobed check valve is between 3 and 6, and the check valve resistance is raised and lowered. The coefficient zui is large, and the Zui high value is 12. The drag coefficient of the plug valve is relatively small, generally 0.4~1.2. The resistance coefficient of the diaphragm valve is about 2.3, the drag coefficient of the butterfly valve is within 0.5, and the drag coefficient of the ball valve is small, just about 0.1. The resistance coefficients of these valves mentioned above are all when the valve is fully open. The choice of valve diameter also takes into account the accuracy and dimensional deviation of the valve production. Selecting the valve diameter should pay attention to the margin for the caliber, generally around 20%. All of the above can be summarized as the flow rate and flow rate of the valve mainly depends on the diameter of the valve. The type of structure of the valve is related to the resistance of the medium. At the same time, the pressure, temperature and medium characteristics of the valve must be within. Flush Mounted Type wireless charger
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