截止阀是指关闭件(阀瓣)沿阀座中线移动的阀门。根据阀瓣的这种移动形式，阀座通口的变化是与阀瓣行程成正比例关系。由于该类阀门的阀杆开启或关闭行程相对较短，而且具有非常可靠的切断功能，又由于阀座通口的变化与阀瓣的行程成正比例关系，非常适合于对流量的调节。因此，这种类型的阀门非常适合作为切断或调节以及节流使用。
Stop valve refers to the valve whose closing part (disc) moves along the centerline of the valve seat. According to this movement form of the valve disc, the change of the valve seat opening is in direct proportion to the stroke of the valve disc. Because the opening or closing stroke of the valve stem of this kind of valve is relatively short, and has a very reliable cutting function, and because the change of the valve seat opening is in direct proportion to the stroke of the valve disc, it is very suitable for the regulation of flow. Therefore, this type of valve is very suitable for cut-off or regulation and throttling.
截止阀的阀瓣一旦从关闭位置移开，它的阀座和阀瓣密封面之间就不再有接触，因而它的密封面机械磨损很小，故其密封性能是很好的，缺点是密封面间可能会夹住流动介质中的颗粒。但是，如果把阀瓣做成钢球或瓷球，这个问题也就迎韧而解了。由于大部分截止阀的阀座和阀瓣比较容易修理或更换，而且在修理或更换密封元件时无需把整个阀门从管线上拆卸下来，这在阀门和管线焊成一体的场合是非常适用的。
Once the valve disc of the stop valve is removed from the closed position, there will be no contact between its seat and the sealing surface of the valve disc. Therefore, the mechanical wear of its sealing surface is very small, so its sealing performance is very good. The disadvantage is that the particles in the flowing medium may be clamped between the sealing surfaces. However, if the valve disc is made into steel ball or porcelain ball, this problem will be solved. Because the valve seat and disc of most stop valves are relatively easy to repair or replace, and there is no need to disassemble the whole valve from the pipeline when repairing or replacing the sealing elements, it is very applicable when the valve and pipeline are welded into one.
由于介质通过此类阀门时的流动方向发生了变化，因此截止阀的流阻也较高于大多数其他类型的阀门。然而，根据阀体结构和阀杆相对于进、出口通道的布局，这种状况是可以改变的。同时。由于截止阀瓣开与关之间行程小，密封面又能承受多次启闭，因此它很适用于需要频繁开关的场合。
As the flow direction of medium passing through such valves has changed, the flow resistance of stop valves is also higher than that of most other types of valves. However, this situation can be changed according to the structure of the valve body and the layout of the valve stem relative to the inlet and outlet channels. At the same time. Because the stroke between the opening and closing of the stop valve disc is small, and the sealing surface can withstand multiple opening and closing, it is very suitable for occasions requiring frequent opening and closing.
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。
Stop valves can be used in most media process systems. Various forms of stop valves have been developed to meet various uses in petrochemical, electric power, metallurgy, urban construction, chemical and other departments.
截止阀的使用普遍，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。
Globe valves are widely used. However, due to the large opening and closing torque and long structural length, the nominal diameter is usually limited to less than 250mm, and some to 400mm. However, special attention should be paid to the inlet and outlet direction when selecting. Generally, most of the stop valve media below 15mm flows from below the valve disc, while most of the stop valve media above 2o0mm flows from above the valve disc. This is due to the closing torque of the valve. In order to reduce the opening or closing torque, the stop valves above 2o0mm are generally equipped with internal bypass or external bypass valves.
截止阀明显的优点是：
The obvious advantages of stop valve are:
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。
In the process of opening and closing, the friction between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, so it is wear-resistant. (2) the opening height is generally only L / 4 of the diameter of the valve seat channel, so it is much smaller than the gate valve.
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。其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。
Generally, there is only one sealing surface on the valve body and disc, so the manufacturing process is relatively good and easy to maintain. However, the shortcomings of stop valve can not be ignored. Its disadvantage is that the flow resistance coefficient is relatively large, resulting in pressure loss, especially in hydraulic devices.
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