Hard seal ball valve including bonnet, bonnet and forms a closed structure, the Industrial Valves seat is set up on the bonnet stem, the stem end of the product is set on a first transmission pin, the product of the first transmission pin set on the first drive plate, is set up inside the body of the bottom has a shaft, is set up on the fulcrum of a second drive pin, the product of the second drive pin set on a second drive plate, the product of the first transmission between the plate and the second transmission plate set a sphere. This product is simple in structure, low manufacture cost, opening and closing speed, wear small, simple operation. Suitable for high abrasion and strong corrosion conditions and solution to the problem of the ceramic ball valves easily embrittlement hard seal ball valve and its production process. The characteristics of the ball valve is respectively on the surface of the sphere and valve seat with plasma spraying ceramic layer. Due to the use of the characteristics of the ceramic material abrasion resistance and corrosion resistance, strong in the face of high wear and corrosion, the bad working conditions such as high temperature, high pressure, good sealing performance and service life; At the same time due to the seat, sphere and body still USES metal, and can avoid the seat and sphere of embrittlement. The process in the sphere and valve seat machining, coating on the surface of the sphere and valve seat with a certain thickness of the ceramic material form ceramic layer, and then matching surface of a sphere and valve seat grinding respectively, and then push the ball and seat after assembly to grind make hard sphere and Industrial Valves seat seal, the sphere and valve seat to fulfill the requirements of hard seal matching accuracy, improve hard seal ball valve sealing performance.
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