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Low pressure drop than the control valve (C)
Low pressure drop ratio control valve (3) Low pressure drop ratio control valve Lecture 3 Low pressure drop ratio adjustment valve analysis and calculation Zhejiang University Chen Yiqiu Zhang Yurun Zhu Heyun [Abstract] By the low pressure drop ratio control valve design process can know that it is by △ PR is 0.1, its installation features linear and equal percentage of two features to design. In practice, △ PR is not necessarily 0.1, so it is necessary to analyze the performance of low pressure drop ratio control valve at different △ PR values ​​and get the best use of low pressure drop ratio control valve. First, the low pressure drop ratio valve in the different characteristics of △ PR low pressure drop ratio control valve as a control system actuator is installed in the fluid delivery pipeline. According to the pressure drop ratio of the valve, it is the ratio of the pressure drop across the valve (fully open) to the total pressure drop of the system (the pressure drop across the valve at full close). The essence is the resistance of the valve to the overall resistance of the system ratio. The status of process piping in production is ever-changing. One is that as production progresses, the resistance grows naturally: one is the need of changing production plans, and the resistance components are increased or decreased in the process of each process. For example, Nanjing refinery 1 * atmospheric vacuum tower bottom oil output pipe, in order to recover heat than the original design increased heat exchanger, an increase of system resistance; resulting in the actual pressure drop valve than the design of the pressure drop ratio , Affecting the quality of control. Low pressure drop ratio control valve is designed to reduce the pressure drop than the PR of 0.1 neuroticism, while the actual operating conditions of the pressure drop ratio is not necessarily 0.1. Therefore it is very necessary to analyze the working characteristics of low pressure drop ratio control valve under different △ PR. From the previous statement (12) and (13), the inherent flow characteristics of the low pressure drop ratio control valve are respectively related to the subject as follows: (2) According to the working flow characteristic F (h) of the control valve and the inherent flow rate The relationship between the characteristic f (h) and the pressure drop ratio ΔPR is as follows: The relevant pictures of this subject are as follows: (3) Substituting Eqs. (1) and (2) into Eq. Of the relative work flow Q ', the valve pressure drop ratio △ PR (Snake counterattack valve in operation consumes the power of the entire system power consumption ratio) and K'C (valve at a certain opening when the calculation of flow coefficient amplification Multiples), the results shown in Table 1, Table 2 shows the value of the characteristic curve shown in Figure 1, Figure 2. The related pictures of this topic are as follows: Figure 1 LLPV Installation Features ~ △ PR The related pictures of this topic are as follows: Figure 2 ELPV Installation Features ~ △ PR