译文：
电力是最重要的能源行业之一，目前有蒸汽、风力、水力、地热、潮汐发电、太阳能发电，本文重点讨论燃油、煤油、燃气及核电站中部分典型控制阀的选用。这类电站共同点就是将水汽化为蒸汽，利用蒸汽驱动气轮机带动发电机产生电力，不同点是将水转化成蒸汽的能源各不相同，分别有：天然气、燃油、煤炭、原子堆。各种电站的结构大致相同，我们先以联合循环电站为例来简述控制阀的选用，然后再将各电站中不同的部分作简要说明。 简单来看电力流程图实际上是水、蒸汽的循环流程，在此流程中选用控制阀既简单又复杂。简单的是过程介质简单，只有水和蒸汽两种，复杂的是水和蒸汽的温度与压力波动范围大，带来系列问题如：闪蒸、气蚀、冲刷、噪音、腐蚀。但首先要考虑的是控制阀的安全性与可靠性。 我们按照系统流程来展开控制阀选用说明。 给水阀主、副锅炉给水阀、复合型给水调节阀 控制要求：控制锅炉进水，维持汽锅液位与蒸汽流量。 工况要求：锅炉启动时阀门压差可达100-300公斤，流量较小，正常运行时压差较小，流量大，流量可调比为75:1-100:1。 阀门要求：阀体材质为WCB/WC9，对于双阀系统中的启动阀要求抗气蚀，V级关闭等级，对于复合型给水阀需使用特性化阀内件同时满足锅炉启动与正常运行时的需要。一般阀门选择为故障关，(需要注意的是一般给水中为xx溶解其中的氧会加入联胺进行处理，它会对SATELLITE 6号合金或其它的类似合金产生不良反应，所以{zh0}不使用316+STELLITE堆焊的方法处理阀内件，可直接选用416不锈钢材料)。 锅炉给水泵最小流量循环阀 控制要求：使锅炉给水泵安全启动及运行，xx因流量过小、温升增加、水强烈气蚀使泵损坏。(老式电站有使用开关型的最小流量控制阀，同时还有使用机械式的泵自动循环阀)。 工况情况：压降达160-350公斤，是电站系统中承受压差{zd0}的阀门，流量一般为正常流量的30%。 阀门要求：抗气蚀，防堵结构，V级密封等级，泵启动与停止运行时阀门连续工作，泵正常启动后次阀门关阀，阀门通常为故障开。 高/低加热器疏水阀 给水加热器疏水、冷凝水加热器疏水 控制要求：控制加热器中冷凝水的位置，及时将冷凝水排放，即高水位排放，正常水位疏水。 工况情况：介质为饱和水，加热器之间的控制阀压差一般为6-30公斤，{zh1}一级疏水阀直接连接冷凝器或除氧器。 阀门要求：抗闪蒸冲刷，V或VI级密封等级，阀门通常为故障开。 除氧器水位控制阀(DALC) 控制要求：提供流量保持除氧器正常水位，通过加入蒸汽提高水温xx溶解在水中的气体。 工况情况：启动阶段流量较小，压差较大，正常情况流量大，压差小，工况类似给水阀。 阀门要求：较低流量时有效抗气蚀， 减温阀 (减温器) 控制要求：将高压水喷射入蒸汽中使蒸汽温度达到控制要求。 工况情况：介质为水，压差较大，阀门要求：类型多样：喷嘴型，辅助雾化型，自我包容型及对夹型。 减温减压阀(高、低压旁路阀) 控制要求：将高温高压蒸汽调整到一定温度压力的蒸汽；给汽机提供一个旁路通道，锅炉能够独立汽机而工作。 工况情况：高温高压蒸汽减温减压。 阀门要求：抗热冲击，降噪，反应迅速。

“ How to choose the power industry control valve ”是由提供的国际阀门新闻，译文仅供参考。另外，中国控制阀网还提供相关产品搜索：、、、、等。

原文：
Electricity is one of the most important energy sector, there are steam, wind, hydro, geothermal, tidal power, solar power, this paper focuses on fuel oil and kerosene, gas and nuclear power plants in the selection of some typical control valves. Common ground in those plants is to water vapor into steam, using steam-driven gas-turbine driven generator to produce electricity, the difference is the energy of water into steam vary, respectively, are: natural gas, fuel oil, coal, atomic heap. The structure of various power plants or less the same, we first used combined-cycle power plant as an example to briefly control valve selection, and then the different parts of the plant to make a brief description. Simply look at the power flow is actually water, steam cycle process chosen in this process both simple and complex control valves. Media is simple and easy process, only the water and steam are two kinds of complex water and steam temperature and pressure fluctuations over large areas, has brought a series of issues such as: flash, cavitation, erosion, noise, corrosion. But the first thing to consider is the control valve of the safety and reliability. We follow the system flow control valve to expand use instructions. Water Fa Zhu, Vice boiler valve, compound feed water control valve Control requirements: control the boiler water, the maintenance of boilers and steam flow of liquid. Condition Requirements: boiler starts up to 100-300 kg of pressure valves, flow smaller, less pressure during normal operation, traffic flow, flow rate adjustable ratio 75:1-100:1. Valve requirements: body made of WCB/WC9, for the pairs of valves in the system requirements to start anti-cavitation valve, V-class off class for the compound to the water valve need to use features of Valve parts while meeting the boiler startup and normal operation needs. Generally choose to fail off valve, (should be noted that in general to the water to remove dissolved oxygen which will be added hydrazine for processing, it would SATELLITE 6 Hao alloy or other alloys of similar adverse reaction, so it is best not to use 316 + STELLITE surfacing approach to valve parts, can be directly use 416 stainless steel material). Boiler feed pump minimum flow valve cycle Control requirements: the boiler feed pump safe start-up and running, eliminate traffic is too small, temperature increase, the water a strong cavitation damage to the pump. (Old-fashioned power stations are used to switch-based minimum flow control valves, along with the use of mechanical pumps automatically cycle valves). Condition: The pressure drop of up to 160-350 kilograms, is the largest power plant systems to withstand pressure valves, flow is generally normal flow of 30%. Valve requirements: anti-cavitation and plug up the structure, V-class seal level, pump start and stop running when the valve continuous work, pump normally starts off after the second valve valve, valve usually fail to open. High / Low water heater heater trap hydrophobic, hydrophobic condensation water heater Control requirements: Control the location of condensation water heater, condensate water discharge in a timely manner, that is, high water discharge, the normal water level hydrophobic. Conditions: The medium is saturated in water, heater control valve between the pressure is usually 6-30 kg, finally a trap directly connected to the condenser or deaerator. Valve requirements: anti-flash erosion, V, or VI level seal rating, the valve usually fail to open. Deaerator Water Level Control Valve (DALC) Control requirements: to provide flow deaerator to maintain a normal water level, by adding steam to increase temperature to eliminate the gas dissolved in the water. Condition: The flow of small start-up phase, pressure larger normal flow of large pressure difference is small, similar to the valve condition. Valve requirements: low-flow and effective anti-cavitation, Temperature reduction valve (desuperheater) Control requirements: the high-pressure water jet of steam into the steam temperature manipulation to control requirements. Conditions: The medium is water, a larger pressure difference, valve requirements: type of diversity: nozzle type, assisted atomization type, self-contained type and right-clip. Reduced temperature valves (high and low pressure bypass valve) Control requirements: the high-temperature high-pressure steam to adjust to a certain temperature and pressure of the steam; to a steam turbine to provide a bypass channel, boilers, steam turbine capable of independent working. Condition: The high-temperature high-pressure steam temperature and pressure reduction. Valve requirements: resistance to thermal shock, noise reduction, quick response.