其中，球座的外径为Ø53.8，考虑到“check valve”的整体尺

其中，球座的外径为Ø53.8，考虑到“check valve”的整体尺寸不大，根据相关O型圈设计标准《GB/T 3452.1》中表2“一般应用的O型圈内径、截面直径尺寸和公差”选择O型圈的截面直径尺寸为2.65mm，根据O型圈槽的相关设计标准《GB/T 3452.3》中表1“径向密封的沟槽尺寸”，选择O型圈槽的宽度情况： O型圈沟槽宽度为3.6mm，深度为2.1mm，结构如图1.2所示：

Among them, the outer diameter of the ball socket is Φ 53.8. Considering that the overall size of "check valve" is small, the section diameter of the O-ring is 2.65mm according to table 2 "inner diameter, section diameter and tolerance of O-ring for general application" in the relevant O-ring design standard GB / T 3452.1. According to table 1 "groove size of radial seal" in the relevant design standard GB / T 3452.3 of O-ring groove, Select the width of O-ring groove: the width of O-ring groove is 3.6mm and the depth is 2.1mm. The structure is shown in Figure 1.2:

Among them, the outer diameter of the ball seat is 53.8. Considering that the overall size of the "check valve" is not large, the cross-sectional diameter of the O-ring is selected as 2.65mm according to Table 2 "Inner Diameter, Cross-sectional Diameter and Tolerance of General O-rings" in the relevant design standard GB/T 3452.1, and according to the relevant design standard GB/T 3452.3 of the O-ring groove