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What is the specific scope of application of the valve ball
As a kind of valve, the ball valve is widely used in petroleum, chemical industry, power generation, papermaking, atomic energy, aviation, rocket and other industrial fields and people’s daily life due to its compact structure and fast and convenient operation. The ball valve generally includes a valve body, a valve cover, a valve seat, a valve ball, a valve stem and its operating mechanism, wherein the valve ball is the most important component of the ball valve to control the fluid.
During use, the valve ball will be eroded and corroded by the fluid. Once the valve ball is eroded, the ball valve will lose its control and interception effect, which will inevitably cause unnecessary economic and property losses, and even cause unnecessary safety accidents. Therefore, how to make the service life of the valve ball longer becomes an urgent problem to be solved by the technicians of the ball valve.
The valve ball in the existing ball valve is usually made of metal (mainly copper) or plastic. The metal valve ball has defects such as corrosion resulting in liquid leakage and scaling causing the ball valve to be stuck, and the plastic valve ball is not wear-resistant. Disadvantages.
When the operating temperature is between -29 ℃ and 200 ℃, most manual (open and closed) ball valves are suitable for the operation of hydrocarbons and public systems. Ball valves used above 100 ℃ should be carefully considered for the application of soft sealing materials. The temperature limit should be above 100°C. In the operation of high temperature or severe abrasion, the use of metal sealed ball valves should be considered, but it should be noted that the operating torque must be increased.
There are two designs of ball valves, namely float ball and trunnion ball valves. The design of the floating ball valve will produce high operating torque at high pressure or large pipe diameter, but the sealing is better.
Ball valves are not suitable for throttling because when the valve is partially opened, its sealing surface is exposed to the process fluid and is damaged.
For critical operations, you should consider purchasing a ball valve equipped with ball seat and stem lubrication fittings, because lubrication can prevent slight leakage and reduce operating torque. If the valve needs to have two functions of shut-off and relief, it should be provided Ball relief hole independent of lubrication fittings.