The essential components of a ball valve are a valve body, a valve seat, a sphere, a valve stem, and a handle. A ball valve has a sphere as its closing section (or other driving devices). It revolves around the axis of the ball valve and is propelled by the valve stem. It is primarily used in pipelines to cut, distribute, and change the direction of the medium’s flow. Users should select various types of ball valves based on their needs due to the large range of ball valves, including the various functioning principles, media, and application locations. Ball valves are categorized into different categories based on the actual operating conditions at a given location.
According to the structure can be divided into:
The floating ball of the ball valve. Under the influence of medium pressure, the ball can create a certain displacement and push firmly against the outlet end’s sealing surface to maintain the outlet end’s seal.
Although the floating ball valve has a straightforward design and effective sealing capabilities, it is important to take into account whether the material of the sealing ring can withstand the working load of the ball medium because the load of the working medium on the ball is completely transmitted to the outlet sealing ring. Ball valves with medium and low pressure commonly employ this construction.
After being pressurized, the ball of the ball valve is fixed and does not move. Floating valve seats are included with fixed ball and ball valves. The valve seat moves when it is under medium pressure, pressing the sealing ring firmly against the ball to ensure the sealing. Typically, ball bearings are mounted on the upper and lower shafts, and their small operating torque makes them ideal for large-diameter valves with high pressure.
An oil-sealed ball valve, more appropriate for high-pressure large-diameter ball valves, has emerged in recent years in order to decrease the operating torque of the ball valve and increase the availability of the seal. it not only injects special lubricating oil between the sealing surfaces to form an oil film, which improves the sealing performance but also reduces the operating torque.
The elastic ball in the ball valve. The valve seat’s ball and sealing ring are both comprised of metal, therefore a high sealing specific pressure is required. According to the pressure of the medium, an external force must be used to seal the device because the medium’s pressure is insufficient to do so. This valve can handle mediums with high temperatures and pressures.
By widening an elastic groove at the bottom end of the inner wall of the sphere, the elastic sphere acquires its elastic properties. The wedge-shaped head of the valve stem should be used to expand the ball while closing the channel and press the valve seat to accomplish sealing. Release the wedge-shaped head first, then turn the ball while restoring the original prototype so that there is a tiny gap and sealing surface to lessen friction and operating torque between the ball and valve seat.
Post time: Feb-10-2023
