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所在平台: Udemy |
课程主页: https://www.udemy.com/course/control-valve-sizing-for-liquid-applications/
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Coursera 课程《液体应用中的控制阀选型》内容概述 本课程旨在为工程师提供控制阀选型方面的专业知识，并可作为“chemengpro”工程培训库的一部分，其中包含相关工具、模板和附加材料。 **第一章：串联阻力** 介绍串联阻力的概念，并提供泵选型的路线图。 **第二章：阀门** 深入探讨控制阀的流量系数（Cv），包括 Cv 的粘度和比重修正、不同压降下的 Cv 和流量能力，以及 Cv 向阻力系数（K）的换算。讲解了阀门固有特性曲线及其在不同工况下的应用，并介绍了阀门权威性（Valve Authority）的概念。 **第三章：阀门权威性与安装特性曲线** 回顾阀门权威性的定义，对比阀门权威性与系统压头图，展示固有特性曲线与安装特性曲线的差异。通过实例演示如何估算不同阀门开启度下的泵曲线、系统曲线、阀门权威性及安装阀门特性曲线。讲解了如何用数学公式表示阀门开度百分比与系统压头的关系，并分析了操作参数对系统压头曲线的影响。 **第四章：量程比与 turndown** 解释控制阀的量程比（Rangeability）及其应用实例，并探讨阀门 turndown（可调节范围）。 **第五章：阀门选型估算法则** 提供实用的阀门选型估算法则（Rules of Thumb），包括在不同操作流速、液体速度和推荐的控制阀压降下，针对不同阀门开启度的启发式方法。 **第六章：阀门选型中的挑战** 讨论常见的阀门选型问题，重点讲解了气蚀（Cavitation）和闪蒸（Flashing）现象的成因、危害以及检查方法，并通过实例说明如何检查控制阀中的气蚀和闪蒸。 **第七章：阀门选型考虑因素** 提供一份高层指南，列出选择控制阀所需的典型参数。
This course is also available as part of my engineering training library on chemengpro, where I share tools, templates, and bonus materials for engineers.Chapter 1: Resistances in SeriesIntroduction to Resistances in SeriesPump Sizing RoadmapChapter 2: ValvesFlow Coefficient (Cv) for Control ValvesCv Corrections for Viscosity and Specific Gravity for Control ValvesCv and Flow Capacity at Different Pressure Drops for Control ValvesConverting Cv to Resistance Coefficient (K) for Control ValvesInherent Valve Curve for Control ValvesExample of Inherent Valve Curve for Control ValvesIntroduction to Valve Authority for Control ValvesChapter 3: Valve Authority & Installed Characteristic CurveReviewing Valve Authority Definitions for Control ValvesValve Authority vs System Head PlotInherent vs Installed Characteristic Curve for Control ValvesExample: Estimating Pump Curve, System Curve, Valve Authority, and Installed Valve Characteristic Curve at Different Valve Openings for Control ValvesExpressing Valve Open Percentage vs System Head MathematicallyImpact of Operating Parameters on System Head CurveChapter 4: Rangeability & TurndownValve Rangeability for Control ValvesExample of Valve Rangeability for Control ValvesValve Turndown for Control ValvesChapter 5: Rules of Thumb for Sizing a ValveKey Rules of Thumb for Valve Sizing: Includes Heuristics for Different Valve Openings at Different Operating Flowrates, Liquid Velocity, and Recommended Control Valve Pressure Drop Chapter 6: Challenges With Sizing ValvesCommon Sizing IssuesCavitation and Flashing: What Are They, Why Are They a Problem, and How to Check if They Are PresentExample of Checking for Cavitation and Flashing in a Control ValveChapter 7: Valve Selection ConsiderationsValve Selection Considerations: Includes a High-Level Guide on the Typical Parameters Required for Selecting a Control Valve
