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原文
Throttle characteristics and structure Throttle valve structure and appearance is no different, except that they open and close parts of the shape is different. Throttle valve opening and closing pieces of mostly conical streamlined, through its cross-sectional area and change the channel to regulate flow and pressure. Throttle valve for the pressure drop under conditions of great pressure to reduce media use. Medium between the throttle valve and seat a large flow to the surface quickly resulting in damage to these parts - the so-called cavitation phenomenon. To do is to reduce cavitation effects, the use of anti-cavitation valve materials (steel manufacturing) and made ??the top angle of 140 ~ 180 streamlined cone, which also enables the valve to open a larger height, generally do not recommended in the small gap under the throttle. Throttle has the following characteristics: Structure is relatively simple, easy to manufacture and maintenance costs low. Regulation accuracy is not high, can not be adjusted to use. Easy sealing surface erosion, cut off the media can not be used. Sealing is poor. Throttle valve by channels can be divided into two kinds of straight-and angle; by opening and closing parts of the shape points, a needle-shaped, groove-shaped and window-shaped three. Throttle valve installation and maintenance should note the following: Often need to operate the valve, so it should be installed in the easy-to-side operating position. Installation media to pay attention to the direction of the arrow with the body of the standard is consistent.
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译文：

译文：
节流阀的外形结构与截止阀并无区别，只是它们启闭件的形状有所不同。节流阀的启闭件大多为圆锥流线型，通过它改变通道截面积而达到调节流量和压力。节流阀供在压力降极大的情况下作降低介质压力之用。　　介质在节流阀瓣和阀座之间流速很大，以致使这些零件表面很快损坏－即所谓汽蚀现象。为了尽是减少汽蚀影响，阀瓣采用耐汽蚀材料（合金钢制造）并制成顶尖角为140～180的流线型圆锥体，这还能使阀瓣能有较大的开启高度，一般不推荐在小缝隙下节流。　　节流阀具有以下特点：　　构造较简单，便于制造和维修，成本低。　　调节精度不高，不能作调节使用。　　密封面易冲蚀，不能作切断介质用。　　密封性好较差。　　节流阀按通道方式可分为直通式和角式两种；按启闭件的形状分，有针形、沟形和窗形三种。节流阀的安装与维护应注意以下事项：　　该阀经常需要操作，因此应安装在易于方面便操作的位置上。　　安装时要注意介质方向与阀体所标箭头方向保持一致。

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