What are the cross-section and radius of the valve sphere?
We know that the main characteristics of valve spheres are their compact structure, easy operation and maintenance, suitable for general working media such as water, solvents, acids, and natural gas, as well as for media with harsh working conditions such as oxygen, hydrogen peroxide, methane, and ethylene.
The nominal pressure rating (PN) of the valve sphere indicates the maximum working pressure of the valve at normal temperature. For example, PN4.0 indicates a maximum working pressure of 40 Bar (4.0MPa) when operating at temperatures between -290C and 380C. The nameplate of the ball valve displays the maximum operating pressure allowed by the valve ball at the maximum and minimum operating temperatures. The valve body can be integral or modular.
Do you know the relationship between the cross-section and radius of the valve sphere? After experimentation, it was found that:
The line connecting the center of the sphere and the center of the cross-section is perpendicular to the cross-section.
The distance d from the center of the sphere to the cross-section is related to the radius R of the sphere and the radius r of the cross-section as follows: r ^ 2=R ^ 2-d ^ 2. The circle obtained by cutting a plane passing through the center of a sphere is called a large circle, and the circle obtained by cutting a plane not passing through the center of a sphere is called a small circle. On a sphere, the length of the shortest connecting line between two points is the length of an inferior arc passing through the large circle passing through these two points. We call this arc length the spherical distance between the two points.
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