What are the applicable conditions of ball valves?
Ball valve is also suitable for light structure, low pressure cut-off (small pressure), corrosive medium piping system. Ball valves can be used in cryogenic (cryogenic) units and piping systems. In the oxygen pipeline system of metallurgical industry, ball valve with strict degreasing treatment should be used. The main line in the oil pipeline and gas pipeline shall be buried in the ground, and all pass welding type ball valves shall be used. The ball valve with a V shape opening shall be used when required to adjust the performance. In the petroleum, petrochemical, chemical, electric power and urban construction, the piping system with working temperature above 200 degrees can choose metal to metal sealed ball valve.
This deformation can compensate the ball manufacturing accuracy and surface roughness, and ensure the sealing performance of the ball valve.Because the valve seat ring is usually made of plastic, so the choice of valve structure and performance, to consider the ball of fire and fire, especially in petroleum, chemical, metallurgy and other departments, the use of ball valve in the equipment and piping system of flammable and explosive medium, should pay attention to fire and fire.Usually, the double adjustment, strict sealing, slurry wear necking channel, the rapid opening and closing movement (1/4 turn open and close), high pressure cut-off (pressure difference), low noise, there is the phenomenon of cavitation and gasification, a small amount of leakage to the atmosphere,It is recommended that ball valves be used in piping systems with small operating torque and low fluid resistance.
As the ball valve is usually made of rubber, nylon and PTFE as the seat ring material, so its use temperature is limited by the seat ring material. Ball valve is the cut-off role of the metal sphere in the role of the media, in the plastic valve seat between each other to complete the compression (float ball valve). Seat ring sealing ring under certain contact pressure, elastic-plastic deformation occurs in some areas.
