Valve ball is used to control the flow of fluid in the pipeline, because of its simple structure, easy installation and maintenance, good sealing performance, no internal leakage, small size, etc. . So what are the applications of the valve ball? Because the valve ball seat sealing ring is generally made of plastic, so in the selection of the structure and performance of the ball valve, to consider the fire performance of the ball valve, in inflammable and explosive medium equipment and pipeline system use ball valve, should pay more attention to fire prevention. The valve ball is suitable for low pressure cut-off, light structure, corrosive medium pipeline system. Valves may also be used in cryogenic installations and piping systems. In the oxygen pipeline system of the metallurgical industry, the valve ball needs to undergo the strict degreasing treatment when in use. When the main pipeline in oil pipeline and gas pipeline should be buried underground, the full-bore welded valve ball should be used. In the request has the adjustment performance, must choose the special structure with the v-shaped opening valve ball.