译文：
截止阀用途如下： 截止阀可用于大部分介质流程系统中。已研制出满足石化、电力、冶金、城建、化工等部门各种用途的多种形式的截止阀。 截止阀的使用极为普遍，但由于开启和关闭力矩较大、结构长度较长，通常公称通径都限制在250mm 以下，也有到400mm 的，但选用时需特别注意进出口方向。一般15Omm 以下的截止阀介质大都从阀瓣的下方流入，而2O0mm 以上的截止阀介质大都从阀瓣的上方流入。这是考虑到阀门的关闭力矩所致。为了减小开启或关闭力矩，一般2O0mm 以上的截止阀都设内旁通或外旁通阀门。 截止阀最明显的优点是： ( l ）在开启和关闭过程中，由于阀瓣与阀体密封面间的摩擦力比闸阀小，因而耐磨． ( 2 ）开启高度一般仅为阀座通道直径的l / 4 ，因此比闸阀小得多。 ( 3 ）通常在阀体和阀瓣上只有一个密封面，因而制造工艺性比较好，便于维修。但是，截止阀的缺点也是不容忽视的。 缺点主要是流阻系数比较大，因此造成压力损失，特别是在液压装置中，这种压力损失尤为明显。

“ Valve uses and advantages and disadvantages ”是由提供的国际阀门新闻，译文仅供参考。另外，中国截止阀网还提供相关产品搜索：、、、、等。

原文：
Valve for the following purposes: Valve can be used for most of the media flow systems. Has been developed to meet the petrochemical, electric power, metallurgy, urban construction, chemical and other departments for various uses of the various forms of cut-off valve. The use of cut-off valve is very common, but a larger opening and closing moments, the structure length is longer, usually nominal 250mm diameter are limited to the following, but also to 400mm, but need special attention By Using import and export orientation. The following general 15Omm Most medium closing valve below the inflow from the disc, but 2O0mm valve above most medium flows from the top of the valve flap. This is because the torque caused by the closure of the valve. In order to reduce the torque on or off, the general 2O0mm more bypass valves are located inside or outside the bypass valve. The most obvious advantage of cut-off valve is: (L) in the opening and closing process, because the valve flap and valve sealing surface friction forces between the gate is small, and therefore wear. (2) generally only open seat height channel diameter l / 4, so much smaller than the gate valve. (3) in the valve body and disc are usually only one sealing surface, and thus comparison of manufacturing processes, and easy maintenance. However, valve defects can not be ignored. Main drawback is the relatively large flow resistance coefficient, the resulting pressure loss, especially in the hydraulic device, this pressure loss is particularly evident.