为了保证阀门能很好地切断介质的流动，防止介质流出，需要保证阀门完好无损。造成阀箱损坏的原因很多，包括设计不当、密封接触面有缺陷、阀体和阀盖连接松动以及配合不良。所有这些问题都可能导致阀门定位不良和泄漏。因此，通风技术是阀门性能和质量的重要技术，这需要系统和深入的研究。

To ensure that the valve can effectively cut off the flow of the medium and prevent it from flowing out, it is necessary to ensure that the valve is intact and undamaged. There are many reasons for valve box damage, including improper design, defects in sealing contact surfaces, loose connection between valve body and valve cover, and poor fit. All of these issues can lead to poor valve positioning and leakage. Therefore, ventilation technology is an important technology for valve performance and quality, which requires systematic and in-depth research.

自从上海良工阀门诞生以来，它的密封技术有了很大的发展。迄今为止，阀门密封技术主要包括静态密封和动态密封。

Since the birth of Shanghai Lianggong Valve, its sealing technology has made great progress. So far, valve sealing technology mainly includes static sealing and dynamic sealing.

所谓静密封通常是指两个静面之间的密封，静密封重要的密封方法是使用密封。

The so-called static sealing usually refers to the sealing between two static surfaces, and an important sealing method for static sealing is to use sealing.

所谓动态密封主要是指阀杆的密封，即阀门中的介质不会随着阀杆的运动而失效。动态密封的密度法主要采用包装箱。

The so-called dynamic sealing mainly refers to the sealing of the valve stem, which means that the medium in the valve will not fail with the movement of the valve stem. The density method for dynamic sealing mainly uses packaging boxes.

上海良工阀门的类型对密封液的选择有很大影响。

The type of valve used by Shanghai Lianggong has a significant impact on the selection of sealing fluid.

阀门尺寸也是影响密封件选择的主要因素。

Valve size is also a major factor affecting the selection of sealing components.

对于小型阀门，阀杆和填料函内壁之间的环形截面较小。在某些情况下，小不一定是件好事，因为它限制了密封件的选择。小型阀门的环形横截面通常是独特的。很难安装坚固而新颖的密封元件。

For small valves, the circular section between the stem and the inner wall of the packing box is smaller. In some cases, being small may not necessarily be a good thing as it limits the selection of seals. The circular cross-section of small valves is usually unique. It is difficult to install sturdy and innovative sealing components.

大型阀门并不是说没有问题。过大的尺寸将导致阀杆和填料组承受过大的载荷。当阀门振动时，产生的力对于标准密封件来说可能太大。大型阀门不同截面之间的温差也很大，可能导致结构变形。

Large valves do not necessarily mean there are no problems. Excessive size will cause the valve stem and packing group to bear excessive loads. When the valve vibrates, the force generated may be too large for standard seals. The temperature difference between different cross-sections of large valves is also significant, which may cause structural deformation.

对于大多数类型的阀门，理想的填料函尺寸比是空腔高度约为横截面直径的3-5倍。如果是密封要求低的直角回转阀，即使填料函较浅，也能有效密封。填料函过深，意味着密封容易巩固，导致密封应力的损失，然后泄漏。其次，阀杆的高摩擦系数将成为某些应用中的障碍。

For most types of valves, the ideal packing box size ratio is a cavity height of approximately 3-5 times the cross-sectional diameter. If it is a right angle rotary valve with low sealing requirements, even if the packing box is shallow, it can effectively seal. If the packing box is too deep, it first means that the seal is easy to consolidate, leading to a loss of sealing stress and then leakage. Secondly, the high friction coefficient of the valve stem will become an obstacle in certain applications.