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Valve equipment, the characteristics of the flow and transient correlation
Content introduction: When the valve is formed in series in the pipeline, the total resistance coefficient of the series valve system is the sum of the resistance coefficient of each valve. The reciprocal of the square of the flow coefficient of the valve system is the quadratic of the flow coefficient of all the valves The sum of the countdown. When two or more identical valves are connected in series, the flow coefficient of the valve is related to the opening as shown if the valves open and close at the same time. Overcurrent characteristics of parallel valves When the water flow and pipe diameter larger, the control section can be divided into parallel lines of small diameter pipe, to take more than one valve in parallel control. It can be seen from the above deduction that when multiple valves form a parallel connection, the flow coefficient of the parallel valve system is the sum of the flow coefficients of each valve, and the inverse of the square root of the resistance coefficient of the valve system is the quadratic of all the valve flow coefficients The sum of the reciprocal of the root. When two or more identical valves are connected in parallel, the flow coefficient of the valve is related to the opening as shown if the valves open and close at the same time. Because the combined valve system's flow coefficient is the sum of the individual valve flow coefficients, the flow coefficient of the parallel valve is greater than the flow coefficient of any single valve. From the calculation results, the hydraulic shock pressure generated by the piston valve and the ball valve is smaller, and the valve flow coefficient corresponding to the change process is relatively smooth; The water hammer pressure generated by the butterfly valve and the ball gate valve is relatively large, and the corresponding flow coefficient change process is relatively fast. Therefore, according to the need to choose different types of valves and the flow coefficient of smooth change process, can reduce the value of water hammer pressure. If the flow coefficient varies linearly, the process of closing the valve in a straight line will smooth the flow coefficient and the resulting water hammer will be smaller, consistent with previous studies. This result also shows that if the valve's overcurrent characteristics are analyzed in terms of the nominal diameter of the valve, the transient process of valve regulation is directly related to the process of changing the flow coefficient. Conclusion Through the above analysis and calculation can be concluded as follows: 1) Complex valve system overcurrent characteristics and the system of each valve overcurrent characteristics of a direct function relationship, through a single valve valve system overcurrent characteristics of the combination formula Describe the overcurrent characteristics of the entire system. 2) If the valve's over-current characteristics are analyzed based on the nominal diameter of the valve, the transient process of valve regulation is directly related to the change of the flow coefficient. 3) For similar conditions, the water hammer pressure generated in the pipeline is relatively small when the flow coefficient of the valve changes gently (such as piston valve and ball gate valve) during the closing process.