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Author Topic: Fluid Control - An Introduction to Ball Valve  (Read 916 times)

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Fluid Control - An Introduction to Ball Valve
« on: May 13, 2013, 07:07:04 PM »
Ball valves, since invention in the 1950s has grown to be one of the fast-developed valves in recent years, especially in USA, Germany, Japan, France, Italy, Spain and UK where ball valves are widely used.

The types and quantities of ball valve available today is still on the increase, and its engineering development has began to move towards applications of high temperature, high pressure, large port, secure sealing, longer duration, great adjustment and multiple functions.

Due to dedication to research and development, the stability and capability of ball valves have managed to reach higher levels of achievement, which is able to replace gate valves, check valves and throttle valves in applications. Ball valves are widely used in aerospace, petrochemical, pipelines, food and beverage and construction industries.

The Main Features of Ball Valves:

1. Low Flow Resistance
The passage of ball valve can be divided into full port and reduced port. Whether full port or reduced port, its factor of flow resistance are smaller, especially the full-port type. The passage diameter of the full-port ball valve is the same as the pipe diameter that makes the partial resistance equal to friction resistance of the pipe. Therefore, full-port ball valve has the lowest flow resistance compared to other types.

2. Quick and Easy to Open and Close
Its 90-degree manual handle is easy and quick to open and close. In some cases, it only takes as little as 0.05~0.1 second to finish the action. So it is preferable in automation system.

3. Great Sealing
At present, most of the sealing element is made of flexible materials such as Polytetrafluoroethene, PTFE. Sealing element combined with metal and non-metal materials is called soft sealing. Generally speaking, effectiveness of soft sealing is easy to guarantee, and it requires low machining precision and rough surface.

4. Longer Duration
The self-lubrication feature of PTFE reduces the friction between sealing element and ball. Besides, the improvement on machining skills lowers the rough surface of the ball, increasing the life span.

5. The smooth surface of passage facilitates the transportation of sticky fluid, serous fluid and particles.

6. It can work smoothly without applying lubricants which is ideal to handle corrosive medium and low-boiling-point fluid.

7. Under condition of higher pressure and temperature, it can do bi-directional sealing.

8. The sealing elements inside the body and seat can fully separate the medium that can prevent erosion.

9. Its compact construction and light weight is ideal to handle low temperature medium.

10. Its symmetrical design, especially welded ball valve, is easy to take the pressure from Pipeline.

11. The welded ball valve can be directly buried underground to prevent the components inside the body from erosion. The duration can last up to 30 years. It is mostly used in Oil and gas sectors.


Adewale Odubiyi
Owner, Nigeria Oil & Gas Forum

Nigeria Oil & Gas Forum

Fluid Control - An Introduction to Ball Valve
« on: May 13, 2013, 07:07:04 PM »

 

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