Metal hard seal ball valve ball and seat contact surface hardness fit (Tech Center of Shanghai HY Industry Co., Ltd)
Metal sliding contact surface needs to have a certain hardness difference, otherwise it is easy to bite phenomenon. In practice, the general ball and seat hardness difference in 5-10HRC, the hardness difference so that the hydraulic ball valve can have a good service life. Due to the complex processing of the ball, high processing costs, in order to protect the ball is not easy to damage and wear, the general choice of ball hardness is higher than the hardness of the surface of the seat. Valve ball and seat contact surface hardness with the more widely used two hardness with.
ball surface hardness 55HRC, seat surface 45HRC, the ball surface can be supersonically sprayed Stellite20 alloy, the seat surface can be overlay welded Stellite12 alloy, the hardness match is the most widely used hardness match for metal sealed liquid ball valves, can meet the conventional wear requirements of metal hard seal ball valves.
The surface hardness of the valve ball is 68HRC, the surface of the valve seat is 58HRC, the surface of the valve ball can be supersonically sprayed with tungsten carbide, the surface of the valve seat can be supersonically sprayed with Stellite20 alloy, the hardness match is widely used in the coal chemical industry, with high wear resistance and service life.
Internationally there is the use of the ball and seat surface hardness of the same fit, the ball and seat surface are supersonic spraying tungsten carbide process, the surface hardness are greater than 72HRC, even in the case of ultra-hardness, the ball and seat contact surface is not easy to bite, but at present the domestic valve ball production surface hardness greater than 72HRC valve ball, valve seat no mature grinding process, it is difficult to ensure that the ball and seat fit, so the use of less.
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