為了保證閥門能很好地切斷介質的流動，防止介質流出，需要保證閥門完好無損。造成閥箱損壞的原因很多，包括設計不當、密封接觸面有缺陷、閥體和閥蓋連接松動以及配合不良。所有這些問題都可能導致閥門定位不良和泄漏。因此，通風技術是閥門性能和質量的重要技術，這需要系統和深入的研究。

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.

自從上海良工閥門誕生以來，它的密封技術有了很大的發展。迄今為止，閥門密封技術主要包括靜態密封和動態密封。

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.

所謂靜密封通常是指兩個靜面之間的密封，靜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.

所謂動態密封主要是指閥桿的密封，即閥門中的介質不會隨著閥桿的運動而失效。動態密封的密度法主要采用包裝箱。

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.

上海良工閥門的類型對密封液的選擇有很大影響。

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

閥門尺寸也是影響密封件選擇的主要因素。

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

對于小型閥門，閥桿和填料函內壁之間的環形截面較小。在某些情況下，小不一定是件好事，因為它限制了密封件的選擇。小型閥門的環形橫截面通常是獨特的。很難安裝堅固而新穎的密封元件。

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.

大型閥門并不是說沒有問題。過大的尺寸將導致閥桿和填料組承受過大的載荷。當閥門振動時，產生的力對于標準密封件來說可能太大。大型閥門不同截面之間的溫差也很大，可能導致結構變形。

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.

對于大多數類型的閥門，理想的填料函尺寸比是空腔高度約為橫截面直徑的3-5倍。如果是密封要求低的直角回轉閥，即使填料函較淺，也能有效密封。填料函過深，意味著密封容易鞏固，導致密封應力的損失，然后泄漏。其次，閥桿的高摩擦系數將成為某些應用中的障礙。

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.