with the development of science and technology and the demand of modern industry, metal sealed ball valve in the transportation of special medium conditions ( Such as pulp, coal-water slurry and silicon powder mixture containing solid particles) Get more and more widely used. According to the working condition requirements, metal seal was developed for ball valve wear resistance.

metal seal wear resistance ball valve adopts elastic with automatic compensation function of the seat structure, prevent the valve in the condition of containing particulate medium or high temperature circumstances appear card plug phenomenon, improve the service life of the valve. Sphere and valve seat has good shearing and self-cleaning function, suitable for the control of particulate medium and fiber. To stem the side type, can make sure packing reliable seal and stem blow-out proof. The valve structure of sealing in both directions, namely, improves the sealing performance of the valve, also ensure the sealing performance, when the reverse flow of medium to prevent the backflow medium provides the necessary guarantee. Sphere and valve seat sealing surface spraying high temperature and high pressure resistance, corrosion resistance and wear resistance of cemented carbide.

3, technical treatment ( 1) Metal sealing ball valve sealing pressure ratio is higher, sealing pressure is taken into account in structure design need spring pre-tightening force, the downstream seat is fixed, the upstream seat after compensation structure setup disc springs.

( 2) Consider the temperature linear expansion of metal materials, high load disc springs. Offers both valve sealing pressure needed initial pre-tightening force, and also to avoid the phenomenon of sphere and valve seat's resistance caused by the temperature reason, to ensure that the valve opening and closing flexible. Due to solid particle medium into the disc spring tour area can cause failure resistance of disc spring card, add the disc spring protection structure, to ensure that the valve under the condition of low pressure sealing performance.

( 3) As a result of the transmission medium contains solid grain hardness is higher, the sphere and valve seat surface with high hardness. Otherwise, the valve opening and closing process will be a solid particle inlay on sphere surface, affect the overall sealing performance of the valve. So the sphere and valve seat surface spraying tungsten carbide cobalt, nickel base alloy or chromium carbide materials, etc. Make the sealing surface hardness of 56-64 HRC. Different coating materials, different hardness can be obtained.

( 4) Seat designs which has the function of self-cleaning scraper structure, in the process of the valve opening and closing, can adsorption on the surface of a sphere content scraping, prevent solid particles from entering the valve sealing surface, increase the service life of the valve.

( 5) Sphere and Industrial Valves seat adopt numerical control machine tool processing, special spherical grinding, grinding machine and special grinding machine matching grinding.

to floating (- PN6. 3 metal sealing ball valve as an example, sealing pressure, total friction torque, disc spring load calculation.

4。 1, the parameter analysis

( 1) According to the calculated data available qb < q
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