Working principle of ball valves
Ball valves are known for their ability to close tightly with only a 90 degree rotation and minimal turning torque. With a completely symmetrical valve body cavity, medium can flow through with little resistance and no deviation from its original path. Though ball valves are traditionally viewed as a direct opening and closing solution, recent technological developments have enabled them to incorporate throttling and flow control functions as well.
The compact and straightforward structure of ball valves make them easy to operate and maintain. They are ideal for use with a broad range of working media, including water, acids, solvents, and natural gas. Moreover, ball valves perform well under harsh conditions such as those containing oxygen, ethylene, methane, and hydrogen peroxide. Depending on the specific application, ball valves come in both integral and modular options.
Application of Ball Valves
Ball valves are extensively employed in various Chinese industries, including steel, petroleum refining, electricity, chemicals, papermaking, pharmaceuticals, water conservancy, and municipal engineering, and play a vital role in the nation's economy. These valves function through a 90-degree rotation action, and the plug body appears as a sphere housing a circular through hole or channel passing through its center.
In pipeline systems, ball valves play a crucial role in regulating, blocking, and redirecting the flow of liquids or gases. These valves require only a 90-degree rotation and a minimal rotational torque for a secure seal. Ball valves are particularly useful as shut-off valves or switch valves, with some designs even including V-shaped balls for enhanced performance. However, it is vital to consider not only the pipeline specifications but also the surrounding conditions when using electric valves. The electric elements within these valves are electromechanical and, thus, heavily influenced by their operating environment.
Precautions for using ball valves
Before disassembling the ball valve, it is crucial to confirm whether the piping system that leads to and from it has been depressurized. This precautionary step is necessary to prevent any potential accidents or damages during the disassembly process.
It is important to note that non-metallic parts should be taken out of the cleaning agent as soon as they have been cleaned and should not be left to soak for an extended period of time.
To ensure proper assembly, it is crucial to tighten the bolts on the flange symmetrically, gradually, and evenly. This means that each bolt should be tightened in a uniform and systematic way to achieve the desired outcome. Failing to follow these guidelines can lead to a faulty assembly, which could result in significant safety hazards or a malfunctioning system. Therefore, it is essential to adhere to these instructions carefully to ensure a successful and efficient operation.
It is important to select a cleaning agent that is suitable for all the components of the ball valve, including the rubber parts, plastic parts, metal parts, and working media (if any gas is used). If gas is the working medium, gasoline (GB484-89) can be used to clean the metal parts, while pure water or alcohol can be used to clean the non-metallic parts. It is essential to ensure compatibility between the cleaning agent and the components to avoid any damage or corrosion and maintain the longevity of the valve.
It is possible to clean each component of a disassembled ball valve by immersion. Any metal parts that have not decomposed or non-metallic parts can be wiped with a clean silk cloth that has been impregnated with a suitable cleaning agent. To prevent detachment of fibers and adherence to parts, use a fine and clean silk cloth. During the cleaning process, it is essential to remove all grease, dirt, adhesive deposits, dust, or any other substances that have stuck to the valve surface.
To avoid any harm to the sealing surface of the components, particularly the non-metallic parts, it is necessary to exercise caution while taking apart and putting together ball valves. When it comes to removing O-rings, specialized tools should be used.
It's important to allow the wall cleaning agent to evaporate before reassembling furniture after cleaning. A silk cloth can be used to wipe away any excess cleaning agent, but it's important not to leave the furniture for too long as it may become rusted or contaminated by dust. Remember to be patient and let the cleaner fully evaporate before continuing.
It is necessary to clean new parts before putting them together during the assembly process.
To ensure proper lubrication, it is important to use compatible lubricating grease for ball valves. This lubricating grease should work well with the metal materials, rubber parts, plastic parts, and the working medium of the valve. When working with gas as the working medium, Te221 lubricating grease is a good choice. To apply the lubricating grease correctly, a thin layer should be used on the surface of the seal installation groove, the rubber seal, and on the sealing and friction surfaces of the valve stem. By following these steps, optimal performance can be achieved in ball valve operation.