Views: 15 Author: Site Editor Publish Time: 2022-09-22 Origin: Site
Since the ball valve usually uses rubber, nylon and polytetrafluoroethylene as the material of the seat seal, its operating temperature is limited by the material of the seat seal. The cut-off effect of the ball valve is accomplished by pressing the metal ball against the plastic valve seat under the action of the medium (floating ball valve). Under the action of a certain contact pressure, the valve seat sealing ring undergoes elastic-plastic deformation in local areas. This deformation can compensate for the manufacturing accuracy and surface roughness of the sphere, ensure the sealing performance of the ball valve.
Because the valve seat sealing ring of the ball valve is usually made of plastic, when selecting the structure and performance of the ball valve, the fire resistance and anti-static properties of the ball valve should be considered, especially in the petroleum, chemical, metallurgical and other departments. When using ball valves in equipment and pipeline systems with flammable and explosive media, more attention should be paid to fire resistance and anti-static.
Usually, in two-position adjustment, strict sealing performance, mud, wear, shrinking channel, rapid opening and closing action (1/4r), high pressure cut-off (large pressure difference), low noise, cavitation and vaporization, and a small amount of air to the atmosphere in the pipeline system with leakage, small operating torque and small fluid resistance, it is recommended to use a ball valve.
The ball valve is also suitable for the pipeline system of light structure, low pressure cut-off (small pressure difference) and corrosive medium.
Ball valves can also be used in cryogenic (cryogenic) installations and piping systems.
In the oxygen pipeline system in the metallurgical industry, ball valves that have undergone strict degreasing treatment are required.
The main line and branch line in the oil pipeline and gas pipeline can be used with three-piece and two-piece ball valves. When it needs to be buried in the ground, a full-bore welded ball valve is required.
When the adjustment 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 sealing ball valves can be used for pipeline systems with operating temperatures above 200oC.
More details of ball valves, please go to https://www.mingpinmetals.com/Brass-Ball-Valve-FxM-pd45629341.html