译文：
　疏水阀在蒸汽加热系统中起到阻汽排水作用，选择合适的疏水阀，可使蒸汽加热设备达到{zg}工作效率。要想达到最理想的效果，就要对各种类型疏水阀的工作性能、特点进行全面的了解。 　　疏水阀的品种很多，各有不同的性能。选用疏水阀时，首先应选其特性能满足蒸汽加热设备的{zj0}运行，然后才考虑其他客观条件，这样选择你所需要的疏水阀才是正确和有效的。 　　疏水阀要能“识别”蒸汽和凝结水，才能起到阻汽排水作用。“识别” 蒸汽和凝结水基于三个原理：密度差、温度差和相变。于是就根据三个原理制造出三种类型的疏水阀：分类为机械型、热静力型、热动力型。 　　机械型也称浮子型，是利用凝结水与蒸汽的密度差，通过凝结水液位变化，使浮子升降带动阀瓣开启或关闭，达到阻汽排水目的。机械型疏水阀的过冷度小，不受工作压力和温度变化的影响，有水即排，加热设备里不存水，能使加热设备达到{zj0}换热效率。{zd0}背压率为80%，工作质量高，是生产工艺加热设备最理想的疏水阀。

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原文：
Traps in the steam heating system in a waste air drainage, select the appropriate traps, steam heating equipment can reach the highest efficiency. To achieve optimal results, we should work on all types of steam trap performance, feature a comprehensive understanding. Steam traps many varieties, each with different performance. Steam traps, the first of its characteristics should be selected to meet the steam heating equipment, the best run, before considering other objective conditions, such choices you need to trap is the correct and effective. Traps to be "identified" steam and condensed water can play a blocking air drainage. "Recognition" of steam and condensate based on three principles: the density difference, temperature difference of change. So on the basis of three principles of creating three types of traps: classified as machine type, thermal static type, thermal power type. Mechanical type, also known as float type, is the use of steam condensate and the density difference, by condensation of water level changes, so that lifting the float valve to open or close the valve drive to achieve the purpose of blocking water vapor. Mechanical-type traps, the undercooling is small, from working pressure and temperature changes, water that is exclusive, not heating equipment in storage, can achieve the best heat transfer efficiency heating equipment. 80% of the maximum back pressure, the work of high quality production process heating equipment is the best trap.