For tungsten carbide valve balls

High-precision tungsten cobalt carbide ball is widely used in oil drilling, deep-sea drilling pump ball, ball, which is the most critical components of the pump one. As the working environment and conditions in the oil drilling industry are more stringent, it is usually in the sand, heavy oil wells, high pressure anti-oil wells containing water, various gases, wax, sand and some other highly corrosive substances, [1] Pumps need to pump oil from hundreds or even thousands of meters of the stratum extraction, which requires its ball and valve seat to have a good seal, wear and corrosion resistance (ball, valve seat with the vacuum after the absolute Pressure 0.36kgN / cm below, 10s within the absolute pressure does not change).

Carbide ball valve main advantages can be divided into the following aspects:
1. It has theoretically the lowest flow resistance (flow resistance is the ratio of the pressure difference applied to both sides of the sample of the sound absorbing material in the steady air state and the velocity of the air flow through the sample.
2. Excellent chemical stability and wear resistance, with most of the liquid and some corrosive media contact;
3. In the high temperature and high pressure environment, still able to achieve a complete seal (nominal pressure from vacuum to 42MPa);
4. As the carbide ball valve with the ball as the opening and closing parts, by the friction effect is small, can achieve rapid opening and closing (can be controlled within 0.05-0.1s), and the impact of the operation is small, in addition, the ball off Can withstand the closure of the existence of a high pressure difference, but also to achieve automatic positioning;
5. It has a two-way seal, making the work more stable and reliable.