Fundamentals of Purification 2018-12-12

When the valve opens, the ball first moves away from the seat

The spool is pulled away from the valve seat through a mechanical contraction action; it does not come into contact with the valve seat as it rotates

When the valve opens, the ball first moves away from the seat

1. No friction during opening and closing. This feature completely solves the problem of poor sealing in traditional valves, which is caused by friction between the sealing surfaces. 2. Top-mounted structure. Valves installed on pipelines can be inspected and repaired directly online, which effectively reduces plant downtime and lowers costs. 3. Single-seat design. It eliminates the problem of the medium in the valve chamber affecting safety of use due to abnormal pressure rise. 4. Low-torque design. The valve stem, with its specially designed structure, allows the valve to be easily opened and closed using only a small handwheel. 5. Wedge-shaped sealing structure. The valve seals by using the mechanical force provided by the valve stem to wedge the ball against the seat, ensuring that its sealing performance is not affected by changes in pipeline pressure differences; thus, reliable sealing is guaranteed under various operating conditions. 6. Self-cleaning structure for the sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline flows evenly around the ball’s sealing surface at 360°, which not only eliminates the localized scouring of the valve seat by high-speed fluid but also removes deposits from the sealing surface, achieving a self-cleaning effect.

When a track-type ball valve is opened or closed, the ball first deflects by an angle before rotating; during the entire opening and closing process, the ball is separated from the valve seat, so the valve seat is not scratched, and the torque required for opening and closing is low

Structural features of orbital ball valves: 1. Frictionless opening and closing. This feature completely solves the problem of poor sealing in traditional valves, which is caused by friction between the sealing surfaces. 2. Top-mounted structure. Valves installed on pipelines can be inspected and repaired directly online, which effectively reduces plant downtime and lowers costs. 3. Single-seat design. It eliminates the problem of the medium in the valve chamber affecting safety of use due to abnormal pressure rise. 4. Low-torque design. The valve stem, with its specially designed structure, allows the valve to be easily opened and closed using only a small handwheel. 5. Wedge-shaped sealing structure. The valve seals by using the mechanical force provided by the valve stem to wedge the ball against the seat, ensuring that its sealing performance is not affected by changes in pipeline pressure differences; thus, reliable sealing is guaranteed under various operating conditions. 6. Self-cleaning structure for the sealing surface. When the ball is tilted away from the valve seat, the fluid in the pipeline flows evenly around the ball’s sealing surface at 360°, which not only eliminates the localized scouring of the valve seat by high-speed fluid but also removes deposits from the sealing surface, achieving a self-cleaning effect. Ball valves can be classified into straight-through, three-way, and right-angle types according to the position of their passages. The latter two types of ball valves are used to distribute the medium and change its flow direction. The following points should be noted for the installation and maintenance of ball valves: 1. Space must be left for the valve handle to rotate. 2. It cannot be used for throttling. 3. Ball valves equipped with a belt drive mechanism should be installed vertically. The working principle of a ball valve is to use the rotation of the valve core to open or close the valve. Ball valves are easy to operate, compact in size, and can be manufactured in large diameters. They offer reliable sealing, a simple structure, and are easy to maintain. The sealing surface and the ball itself remain in a closed state, making them resistant to erosion by the medium flowing through them; as a result, they are widely used in various industries. Ball valves and plug valves belong to the same type of valve; the only difference is that their closing element is a sphere, which rotates around the axis of the valve body to enable opening and closing.

When the valve is opened, the valve core is first pulled away from the valve seat.

1. No friction during opening and closing. This feature completely solves the sealing problem associated with traditional valves, which is caused by friction between the sealing surfaces. 2. Top-mounted structure. Valves installed on pipelines can be inspected and repaired directly online. It can effectively reduce equipment downtime and lower production costs. 3. Single-seat design. It eliminates the problem of the medium in the valve chamber affecting safety due to abnormal pressure increases. 4. Low-torque design. The valve stem, with its specially designed structure, allows the valve to be easily opened and closed using just a small handwheel. 5. Wedge-shaped sealing mechanism. The valve seals by using the mechanical force provided by the valve stem to wedge the ball against the seat. This ensures that the sealing performance of the valve is not affected by changes in pipeline pressure differences, providing reliable sealing under various operating conditions

When the valve opens, the ball first moves away from the valve seat and then rotates 90°; when it closes, it first rotates 90° and then the ball presses against the valve seat