Introduction to the differences and features between ball valves and globe valves

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The working principle of a ball valve is to use the rotating valve stem 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. 　　The main advantages of ball valves are their compact structure, reliable sealing, simple design, and ease of maintenance. The sealing surface and the ball itself remain in a closed state, making them resistant to erosion by the medium flowing through them. They are easy to operate and maintain, and are suitable for use with various working media such as water, solvents, acids, and natural gas. They can also be used with media under harsh operating conditions, such as oxygen, hydrogen, methane, and ethylene, and are widely utilized in various industries. The ball valve body can be integral or modular. A stop valve, also known as a ball valve, belongs to the category of valves with forced sealing; therefore, when the valve is closed, pressure must be applied to the valve disc in order to ensure that the sealing surfaces do not leak. The working principle of a ball valve is to rotate the valve stem 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. High-pressure ball valves are divided into two categories: floating ball type and fixed ball type. 　　Ball valves are primarily used to shut off or connect the flow of medium in pipelines; they can also be employed for regulating and controlling fluid flow. Hard-sealed V-ball valves, in particular, have a strong shear force between their V-shaped ball core and the metal seat coated with cemented carbide, making them especially suitable for handling media that contain fibers or small solid particles. The multi-port ball valve allows for flexible control of the mixing, splitting of fluids, and reversal of their flow direction in pipelines; it can also close any one channel to connect the other two channels together. 　　It has the following advantages: 1. Low fluid resistance, with a drag coefficient equal to that of pipe sections of the same length. 　　2. Simple structure, small size, and light weight. 　　3. Tight and reliable; currently, plastic is widely used as the material for the sealing surfaces of ball valves, offering good sealing performance, and it is also extensively utilized in vacuum systems. 　　4. It is easy to operate and opens/closes quickly – only 90° of rotation is needed to go from fully open to fully closed, facilitating remote control. 　　5. It is easy to maintain; the ball valve has a simple structure, and the sealing rings are usually movable, making it convenient to remove and replace them. 　　6. When fully open or fully closed, the sealing surfaces of the ball and the valve seat are separated from the medium; thus, as the medium passes through, it does not cause erosion 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. 　　Globe valves are a type of valve with forced sealing; their valve stem has a relatively short opening or closing stroke, and they provide a very reliable shut-off action, which makes them highly suitable for shutting off, regulating, or throttling fluids. Therefore, when the valve is closed, pressure must be applied to the valve disc to force the sealing surfaces to remain leak-free. When the medium enters the valve from below the valve disc, the resistance that the operating force must overcome consists of the friction between the valve stem and the packing, as well as the thrust generated by the pressure of the medium. The force required to close the valve is greater than that needed to open it; therefore, the diameter of the valve stem must be large, otherwise the valve stem may bend. Once the disc of a globe valve is in the open position, there is no longer any contact between its seat and the sealing surface of the disc, resulting in a very reliable shut-off action; this makes such valves highly suitable for shutting off, regulating, or throttling fluids. 　　Globe valves have the following advantages: 1. Simple structure, making them easy to manufacture and maintain. 　　2. The working stroke is small, and the opening and closing time is short. 　　3. It has good sealing performance, low friction between the sealing surfaces, and a long service life. 　　The disadvantages of globe valves are as follows: 1. High fluid resistance, and significant force is required to open and close them. 　　2. Not suitable for media containing particles, with high viscosity, or prone to coking. 　　3. The adjustment performance is poor.