The male ball valve design is a key characteristic...MORE >>
Since Ball Valve usually use rubber, nylon and PTFE as […]
Since Ball Valve usually use rubber, nylon and PTFE as the material of the seat seal, its service temperature is limited by the material of the seat seal. The cut-off function of the ball valve is achieved by the metal ball under the action of the medium, and the plastic valve seat is pressed against each other (floating ball valve). Under a certain contact pressure, the valve seat sealing ring will undergo elastic-plastic deformation in some areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the ball and ensure the sealing performance of the ball valve.
And because the valve seat sealing ring of the ball valve is usually made of plastic, so when selecting the structure and performance of the ball valve, the fire resistance and fire prevention of the ball valve should be considered, especially in the petroleum, chemical, metallurgical and other departments, in the flammable and explosive media. Ball valves are used in advanced equipment and piping systems, and more attention should be paid to fire resistance and fire prevention.
Generally, in double-position adjustment, strict sealing performance, mud, wear, narrowing channel, rapid opening and closing (1/4 turn opening and closing), high pressure cut-off (large pressure difference), low noise, cavitation and gasification, Ball valves are recommended for piping systems with a small amount of leakage to the atmosphere, small operating torque, and small fluid resistance.
Ball valves are also suitable for pipeline systems with light structure, low pressure cut-off (small pressure difference), and corrosive media.
Ball valves can also be used in cryogenic (cryogenic) devices and piping systems.
In the oxygen pipeline system in the metallurgical industry, ball valves that have undergone strict degreasing treatment are required.
When the main lines in oil pipelines and gas pipelines need to be buried underground, full-bore welded ball valves are required.
When regulating performance is required, a ball valve with a special structure with a V-shaped opening should be selected.
In petroleum, petrochemical, chemical, electric power, and urban construction, metal-to-metal sealed ball valves can be selected for piping systems with operating temperatures above 200°C.