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阀门选型、功能,及管道系统的主要因素 Function and service considerations |
![]() 美国尼伯科有限公司 |
Selection Valves serve the purpose of controlling the fluids in building services piping. Valves are produced in a variety of design types and materials. 为了保证管道系统能够实现最高的效率,最低的成本和最长的使用寿命,阀门的正确选型至关重要。 Proper selection is important to ensure the most efficient, cost-effective and long-lasting systems. Function Valves are designed to perform four principal functions: 1. 启动和阻止介质流动 1. Starting and stopping the flow 2. 调节(节流)介质流量 2. Regulating (throttling) the flow 3. 阻止倒流或回流 3. Preventing reversal of the flow 4. 调节或泄放流体压力 4. Regulating or relieving the pressure of the flow |
Service Considerations 1. Pressure 2. 温度 2. Temperature 3. 流体介质类型 3. Type of fluid a) 流体 a) Liquid b) 气体:例如,蒸汽或空气 b) Gas; i.e., steam or air c) 杂质或研磨剂(侵蚀性物质)含量 c) Dirty or abrasive (erosive) d) 腐蚀性 d) Corrosive 4. 介质流动 4. Flow a) 开启-关闭调节 a) On-off throttling b) 需要防止倒流或回流 b) Need to prevent flow reversal c) 关注压降 c) Concern for pressure drop d) 流速 d) Velocity 5. 工作环境 5. Operating conditions a) 冷凝 a) Condensation b) 工作频率 b) Frequency of operation c) 可接近性 c) Accessibility d) 外形尺寸/所适用的空间 d) Overall size/space available e) 手动或自动控制 e) Manual or automated control f) 需要具有无气泡关闭性能 f) Need for bubble-tight shut-off |
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