Tungsten Carbide Valve Ball Advantages (2/2)

Continued from the preceding page, the advantages of tungsten carbide ball valve are given as follow:

5. It has bidirectional sealing property, which make the process more stable;

6. When fully open or fully closed, the ball and seat sealing surface and the medium is completely isolated state, which makes high-speed flow of the media is not prolonged contact with the sealing surface of the seat caused by erosion;

7. It is light in weight, has compact structure and suitable for high-temperature and low-temperature media system (In a range of -204℃-815℃);

8. Ball valve has symmetrical structure so that it can endure the pressure from pipeline perfectly;

9. Overall fully welded ball valve body can also be directly buried in the ground, so that the valve member from erosion, oil and gas pipelines in the most ideal type of valves, maximum useful life of 30 years.

In addition, to ensure the stability of tungsten carbide valve ball, the choice of the material of tungsten carbide ball seat is also can not be ignored. It requires that smaller coefficient of friction, stable physicochemical properties, broader range of temperature, excellent sealing property and so on. Common materials include copolymers of tetrafluoroethylene (PTFE), nylon and some synthetic rubber. However, these materials have also some defects, such as tetrafluoroethylene has a higher coefficient of thermal expansion, poor thermal conductivity, for lack of sensitivity to temperature, when the sealing material hardens, sealing it also decreases, especially when the pressure difference is low. Some synthetic rubber is limited by media types or temperature range, if there is no lubricant, it will be stuck.

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