Generally, stainless steel ball valves are recommended for pipeline systems with double position adjustment, strict sealing performance, mud, abrasion, necking channel, quick opening and closing (1 / 4 turn opening and closing), high pressure cut-off (large differential pressure), low noise, cavitation and gasification, small leakage to the atmosphere, small operating torque and small fluid resistance.
Since the stainless steel ball valve usually uses rubber and polytetrafluoroethylene as the seat sealing ring material, its use temperature is limited by the seat sealing ring material. The cut-off effect of stainless steel ball valve is achieved by pressing metal ball and plastic valve seat under the action of medium (floating ball valve). Under the action of a certain contact pressure, the seat sealing ring has elastic-plastic deformation in some areas. This deformation can compensate the manufacturing accuracy and surface roughness of the ball and ensure the sealing performance of the stainless steel ball valve.
Because the valve seat sealing ring of ball valve is usually made of plastic, the fire resistance and fire prevention of ball valve should be considered in the selection of structure and performance of stainless steel ball valve, especially in petroleum, chemical, metallurgical and other departments, when using ball valve in equipment and pipe system with inflammable and explosive medium, more attention should be paid to fire resistance and fire prevention.
Stainless steel ball valve is also suitable for light structure, low pressure cut-off (small pressure difference), corrosive medium pipeline system.
Stainless steel ball valves can also be used in cryogenic (cryogenic) devices and piping systems.
In the oxygen pipeline system of metallurgical industry, stainless steel ball valve with strict degreasing treatment should be used.
When the main pipelines in oil and gas pipelines need to be buried underground, full bore welded ball valves should be used.
When regulating performance is required, special stainless steel ball valve with V-shaped opening shall be selected.
In petroleum, petrochemical, chemical, electric power and urban construction, stainless steel ball valve with metal to metal seal can be selected for pipeline system with working temperature above 200 ℃.
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