Abs Shower Head,Shower Head High Pressure,Chrome Shower Head,Abs Plastic Shower Head Kaiping Rainparty Sanitary Ware Technology Co.,Ltd. , https://www.rpshower.com
Types of Ball Valves
Medium and large ball valves can be categorized into various types, including floating ball valves, fixed ball valves, track ball valves, V-ball valves, three-way ball valves, stainless steel ball valves, forged steel ball valves, unloading ball valves, electric ball valves, pneumatic ball valves, ferrule ball valves, welded ball valves, flanged ball valves, and wire ball valves.
The floating ball valve features a ball that is free to float. When under the influence of medium pressure, the ball can move slightly and press against the sealing surface at the outlet end to ensure proper sealing. These valves have a relatively simple design and excellent sealing capabilities. However, the entire load from the ball is transferred to the outlet sealing ring. This means that the material of the sealing ring must be able to handle the pressure exerted by the medium. Additionally, when exposed to high-pressure shocks, the ball might become displaced. As such, this type of valve is typically used for medium and low-pressure applications.
In contrast, the fixed ball valve has a ball that remains stationary even under pressure. The valve seat of a fixed ball valve is designed to float, moving under medium pressure to press the sealing ring against the ball, ensuring a tight seal. Fixed ball valves often feature upper and lower shafts attached to the ball, which helps reduce the operating torque. These valves are ideal for high-pressure and large-diameter applications. Recently, oil-sealed ball valves have been developed to further reduce operating torque and enhance sealing reliability. By injecting specialized lubricating oil between the sealing surfaces, an oil film forms, improving sealing performance and decreasing torque—this makes them particularly suited for high-pressure and large-diameter scenarios.
Elastic ball valves utilize a ball with elastic properties. Both the ball and the sealing surface are made from metallic materials, requiring significant sealing pressure. Medium pressure alone cannot achieve adequate sealing, necessitating an additional external force. These valves are well-suited for high-temperature and high-pressure environments. The elasticity of the ball is achieved by creating an elastic groove at the bottom inner wall of the sphere. When closing the passage, the wedge of the valve stem pushes the ball against the seat to seal. Before rotating the ball, the wedge is loosened, allowing the ball to return to its original shape, creating a slight gap between the ball and the seat. This minimizes friction and reduces the operating torque of the sealing surfaces.
Overall, ball valves come in a variety of designs, each tailored to specific needs and conditions. Whether you're dealing with low or high pressure, or extreme temperatures, there's a ball valve out there designed to meet your requirements. Understanding the nuances of each type is crucial for selecting the right valve for your application.
Type of ball valve