1、按闸板的构造可分
1. According to the structure of the gate, it can be divided into
1）平行式闸阀：密封面与垂直线平行，即两个密封面互相平行的闸阀。
1) Parallel gate valve: A gate valve where the sealing surface is parallel to the vertical centerline, i.e. two sealing surfaces are parallel to each other.
在平行式闸阀中，以带推力楔块的结构zui常为常见，既在两闸板中间有双面推力楔块，这种闸阀适用于低压中小口径（DN40—300mm）闸阀。也有在两闸板间带有弹簧的，弹簧能产生予紧力，有利于闸板的密封。
In parallel gate valves, a structure with a thrust wedge is often common, with a double-sided thrust wedge in the middle of the two gate plates. This type of gate valve is suitable for low pressure small and medium-sized (DN40-300mm) gate valves. There are also those with springs between the two rams, which can generate pre tightening force and facilitate the sealing of the rams.
2）楔式闸阀：密封面与垂直线成某种角度，即两个密封面成楔形的闸阀。
2) Wedge gate valve: A gate valve with a sealing surface at an angle to the vertical centerline, i.e. two sealing surfaces forming a wedge shape.
密封面的倾斜角度一般有2°52?，3°30?，5°， 8°， 10°等，角度的大小主要取决于介质温度的高低。一般工作温度愈高，所取角度应愈大，以减小温度变化时发生楔住的可能性。
The inclination angle of the sealing surface is generally 2 ° 52 °?, 3 ° 30 °?, The angle of 5 °, 8 °, 10 °, etc. mainly depends on the temperature of the medium. The higher the working temperature, the larger the angle taken to reduce the possibility of wedging during temperature changes.
在楔式闸阀中，又有单闸板，双闸板和弹性闸板之分。单闸板楔式闸阀，结构简单，使用可靠，但对密封面角度的精度要求较高，加工和维修较困难，温度变化时楔住的可能性很大。双闸板楔式闸阀在水和蒸气介质管路中使用较多。它的优点是：对密封面角度的精度要求较低，温度变化不易引起楔住的现象，密封面磨损时，可以加垫片补偿。但这种结构零件较多，在粘性介质中易粘结，影响密封。更主要是上、下挡板长期使用易产生锈蚀，闸板容易脱落。弹性闸板楔式闸阀，它具有单闸板楔式闸阀结构简单，使用可*的优点，又能产生微量的弹性变形弥补密封面角度加工过程中产生的偏差，改善工艺性，现已被大量采用。
In wedge gate valves, there are three types: single gate, double gate, and elastic gate. The single gate wedge gate valve has a simple structure and reliable use, but it has a high requirement for the accuracy of the sealing surface angle, making it difficult to process and maintain. There is a high possibility of wedging during temperature changes. Double wedge gate valves are commonly used in water and steam medium pipelines. Its advantages are: low precision requirements for the sealing surface angle, less likely to cause wedging due to temperature changes, and the use of gaskets to compensate for wear on the sealing surface. But this type of structural component has many parts, which are easy to bond in viscous media and affect sealing. The main issue is that the upper and lower baffles are prone to rusting and the gate is prone to falling off after long-term use. Elastic wedge gate valve, which has the advantages of simple structure and easy use of a single wedge gate valve, and can generate a small amount of elastic deformation to compensate for the deviation generated during the sealing surface angle machining process, improving the processability, has been widely adopted.
2、按阀杆的构造闸阀又可分为
2. According to the structure of the valve stem, gate valves can be further divided into
1） 明杆闸阀：阀杆螺母在阀盖或支架上，开闭闸板时，用旋转阀杆螺母来实现阀杆的升降。这种结构对阀杆的润滑有利，开闭程度明显，因此被广泛采用。
1) Rising stem gate valve: The valve stem nut is placed on the valve cover or bracket. When opening and closing the gate, the valve stem nut is rotated to achieve the lifting and lowering of the valve stem. This structure is beneficial for the lubrication of the valve stem and has a clear degree of opening and closing, so it is widely used.
2） 暗杆闸阀：阀杆螺母在阀体内，与介质直接接触。开闭闸板时，用旋转阀杆来实现。这种结构的优点是：闸阀的高度总保持不变，因此安装空间小，适用于大口径或对安装空间受限制的闸阀。此种结构要装有开闭指示器，以指示开闭程度。这种结构的缺点是：阀杆螺纹不仅无法润滑，而且直接接受介质侵蚀，容易损坏。
2) Non rising stem gate valve: The stem nut is located inside the valve body and in direct contact with the medium. When opening and closing the gate, rotate the valve stem to achieve this. The advantage of this structure is that the height of the gate valve remains constant, so the installation space is small, making it suitable for gate valves with large diameters or limited installation space. This structure should be equipped with an opening and closing indicator to indicate the degree of opening and closing. The disadvantage of this structure is that the valve stem thread not only cannot be lubricated, but also directly accepts medium erosion, which is easy to damage.
四、闸阀的通径收缩
4、 Shrinkage of gate valve diameter
如果一个阀体内的通道直径不一样（往往都是阀座处的通径小于法兰连接处的通径），称为通径收缩。
If the diameter of the channels inside a valve body is different (often the diameter at the valve seat is smaller than the diameter at the flange connection), it is called diameter contraction.
通径收缩能使零件尺寸缩小，开、闭所需力相应减小，同时可扩大零部件的应用范围。但通径收缩后。流体阻力损失增大。
Diameter shrinkage can reduce the size of parts, reduce the force required for opening and closing, and expand the application range of components. But after the diameter shrinks. The fluid resistance loss increases.
在某些部门的某些工作条件下（如石油部门的输油管线），不允许采用通径收缩的阀门。这一方面是为了减小管线的阻力损失，另一方面是为了避免通径收缩后给机械清扫管线造成障碍。
Under certain working conditions in certain departments (such as oil pipelines in the petroleum department), it is not allowed to use valves with diameter shrinkage. On the one hand, this is to reduce the resistance loss of the pipeline, and on the other hand, to avoid obstacles to mechanical cleaning of the pipeline caused by diameter shrinkage.
With the summary above from Lianggong Valve Agency, we hope it can be helpful to our customers. If you have any questions or need help, please click on our website: http://www.jnlgvf.com Or call for consultation, and we will do our best to solve it for you
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