Introduction To The Structure And Working Principle of Stainless Steel Plate Ball Valve

1pc Ball Valve

•     Structure: It has a one - piece body, usually made by casting or forging. The valve stem is connected to the ball, and a sealing ring, such as PTFE, is set between the ball and the body. Its port size is usually smaller than the pipeline size, featuring a reduced - bore design.

•     Working Principle: Based on the rotation of the ball to control the on - off of the fluid. When the hole in the ball is completely aligned with the inlet and outlet of the body, the fluid can pass through smoothly; when the ball rotates to make the hole perpendicular to the inlet and outlet, the fluid is cut off.

•     Features and Applications: It is simple in structure, small in size, light in weight, and low in cost. It has quick opening and closing, good sealing performance, and small fluid resistance. However, it is not easy to disassemble and repair, and can only be replaced as a whole when damaged. It is widely used in plumbing, HVAC systems, and some industrial processes where the flow is small and the requirements for disassembly and repair are not high.

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2pc Ball Valve

•     Structure: The body is composed of two parts, which are connected by threads or bolts. The sphere, seat, and sealing ring are combined in an independent module manner. The valve stem is connected to the sphere, and there are manual handles or electric actuators and other operating devices on the valve stem.

•     Working Principle: Rotate the valve stem to drive the sphere to rotate. When the hole in the sphere is aligned with the pipeline, the fluid can pass through; when the sphere rotates to make the hole misaligned with the pipeline, the surface of the sphere forms a sealing line with the body to achieve sealing and cut off the fluid.

•     Features and Applications: It is easy to install and maintain, and the sphere and seat components can be independently disassembled without disassembling the entire pipeline system. It has a two - way sealing function, good sealing performance, small operating torque, and smooth flow path. It is suitable for occasions where medium flow and sealing performance are required, such as in some chemical, petroleum, and water treatment systems.

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3pc Ball Valve

•     Structure: It consists of three parts: the left body, the right body, and the middle body. The connection modes of the connectors include threaded connection, welding, or flange connection. The valve stem adopts a downward - sealing structure, and the seat adopts an elastic sealing structure.

•     Working Principle: When opening the valve, turn the handwheel counterclockwise, the valve stem moves in the opposite direction, and the angle plane at the bottom of the valve stem makes the ball leave the seat, and then the ball rotates to the fully open position; when closing the valve, turn the handwheel clockwise, the valve stem descends and drives the ball to rotate, and finally the ball is pressed tightly on the seat by the mechanical force of the valve stem to achieve sealing.

•     Features and Applications: It is easy to disassemble, and the components can be disassembled for cleaning or repair without removing the entire valve, and sometimes the body can still be in place. It has the advantages of no friction during opening and closing, not easy to wear the seal, and small opening and closing torque. It is suitable for high - cycle, high - pressure applications that require frequent maintenance, such as in the petroleum, chemical, and power industries.

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