Forums > General Discussion > What are the types of ball valves? How to choose the right ball valve?
| What are the types of ball valves? How to choose the right ball valve? | |
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| Posted: 21 Jun 2022 05:05 UTC | Post #1 |
| Kaiwen Deck & Engine |
Registered Total Posts: 6 |
| Regarding the above issues, today Kaiwen will be announced one by one, and then come and see me. Ball valve basic information In a ball valve, the opening and closing part (ball) is driven by the valve stem. It is a valve in which the valve core ball rotates around the center line of the valve body to open and close. It can also be used for fluid regulation and control. There are also plug valves of the same type. The main feature of the ball valve is its compact structure, easy operation, and maintenance, suitable for general working media such as water, solvent, acid, and natural gas, and also suitable for media with harsh working conditions, such as oxygen, and hydrogen peroxide, methane, and ethylene. The ball valve body can be integral or combined. Ball valve classification Acco rding to the structure, it can be divided into floating ball valves and fixed ball valves; according to the ball installation method, it can be divided into top-mounted, side-mounted, and inclined-mounted ball valves. Asana; split type can be divided into the two-part and three-part ball valves. Today we mainly introduce floating ball valves and fixed ball valves. 1. Floating ball valve The ball core floats under the pressure, the sealing valve seat at the outlet end is compressed, and the sealing effect has been achieved. Considering the pressure bearing capacity and caliber, it generally corresponds to medium and low-pressure small-caliber ball valves. 2. Fixed ball valve The upper and lower shafts of the valve core are equipped with bearings, with low torque, generally with a floating valve seat, which is pressed against the ball core to achieve sealing. Ball valve Selection of ball valve Since the ball valve usually uses rubber, nylon, and PTFE as the material of the seat seal, its operating temperature is limited by the material of the seat seal. The cut-off effect of the ball valve is accomplished by pressing the metal ball against the plastic valve seat under the action of the medium (floating ball valve). Under the action of certain contact pressure, the valve seat sealing ring undergoes elastic-plastic deformation in local areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the sphere and ensure the sealing performance of the ball valve. And because the valve seat sealing ring of the ball valve is usually made of plastic, when choosing the structure and performance of the ball valve, the fire resistance and fire resistance of the ball valve should be considered, especially in the petroleum, chemical, metallurgical and other departments, in flammable and explosive media. If ball valves are used in the equipment and pipeline systems, more attention should be paid to fire resistance and fire protection. U sually, in two-position adjustment, strict sealing performance, mud, wear, shrinking channel, quick opening and closing action (1/4 turn opening and closing), high-pressure cut-off (large pressure difference), low noise, cavitation and gasification, Ball valves are recommended for pipeline systems with small amount of leakage to the atmosphere, small operating torque, and small fluid resistance. Ball valve:https://www.kw valvescontrol.com/Ba ll-valves | |
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