Differences between one-piece ball valves and two-piece ball valves

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A ball valve is a valve in which the closing element (the ball) is driven by a valve stem and rotates around the axis of the ball valve. It can also be used for the conditioning and control of fluids. In such applications, the hard-sealed V-ball valve features a high shear force between its V-shaped ball core and the metal seat coated with cemented carbide, making it particularly suitable for media containing fibers, fine solid particles, and the like. The multi-port ball valve enables precise control of the mixing, splitting, and direction reversal of the fluid in the pipeline; it can also seal any one channel, thereby connecting the other two channels together. Valves of this type should generally be installed horizontally in pipelines. Today, we will be explaining the one-piece ball valve and the two-piece ball valve. Many people find it difficult to distinguish between these two types of ball valves; so what are the differences between them? 1. Introduction to the one-piece ball valve: The one-piece ball valve belongs to the same category as the flanged gate valve. The difference lies in the fact that its closing element is a sphere, which rotates around the center line of the valve body to enable opening and closing of the valve. Ball valves are primarily used in pipelines to shut off flow, distribute it, and change the direction of the fluid flow. The Guangdong-style ball valve is a new type of valve that has been widely used in recent years. 1. Characteristics of one-piece ball valves: 1. Low fluid resistance, with a resistance coefficient comparable to that of pipe sections of the same length. 2. Simple structure, small size, and light weight. 3. It is tight and reliable; plastic is widely used as the material for the sealing surfaces of current ball valves, resulting in good sealing performance, and it is also extensively utilized in vacuum systems. 4. Easy to operate with quick opening and closing; it only requires a 90° rotation from fully open to fully closed, facilitating remote control. 5. It is easy to repair; the ball valve has a simple structure, and the sealing rings are usually movable, making disassembly and replacement straightforward. 6. When fully open or fully closed, the sealing surfaces of the ball and the valve seat are separated from the medium; as a result, the medium does not cause corrosion of the valve’s sealing surfaces. 7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and it can be used in conditions ranging from high vacuum to high pressure. When the ball rotates 90 degrees, its spherical surface should be fully visible at both the inlet and outlet to prevent movement. http://www.tozenv.com/UploadFile/2017108223754320.jpg II. Introduction to two-piece ball valves 1. No conflict during opening and closing. This function completely solves the sealing problem associated with traditional valves, which is caused by the interference between their sealing surfaces. 2. Upper-mounted structure. Valves installed on pipelines can be directly inspected and repaired online, which effectively reduces plant downtime and lowers costs. 3. Single-seat design. It eliminates the problem of abnormal pressure rise in the valve’s internal chamber affecting operational safety. 4. Low torque planning. The valve stem designed with a special structure allows the valve to be easily opened and closed simply by using a small handle. 5. Wedge-shaped sealing structure. The valve seals by using the mechanical force supplied by the valve stem to wedge the ball against the valve seat, ensuring that its sealing performance is not affected by changes in pipeline pressure differences; thus, reliable sealing is maintained 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 sealing surface of the ball at 360°, which not only eliminates the scouring effect of high-speed fluid on the valve seat area but also removes deposits from the sealing surface, achieving a self-cleaning effect. http://www.tozenv.com/UploadFile/2017108223758804.jpg III. Differences between one-piece ball valves and two-piece ball valves. The working principle of a one-piece ball valve, also known as a Guang-style ball valve, is to open or close the valve by rotating the valve stem. 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 surface remain in contact when the valve is closed, making them resistant to erosion by the medium flowing through them; as a result, they are widely used in various industries. Two-piece ball valves and gate valves belong to the same type of valve; the difference lies in the fact that their sealing element is a sphere, which rotates around the center line of the valve body to achieve either an open or closed state. Ball valves are primarily used in pipelines to block, distribute, and change the flow direction of the medium. The biggest difference between the two is the valve body. The differences between one-piece ball valves and two-piece ball valves have been explained in detail above; we believe you now understand them better. We use ball valves less often in our daily lives, but they are widely used in other industries. They are small in size, have a simple structure, and are easy to protect, which is why they are used in many local areas. Specifically, whether to use a one-piece ball valve or a two-piece ball valve depends on the operational requirements, to determine which type is more suitable. Related knowledge: Introduction to valve products, Introduction to check valve products, Introduction to globe valve products, Introduction to gate valve products, Introduction to ball valve products