Ball and valve seat grinding device for ball valve

The utility model discloses a ball and valve seat grinding device for a ball valve. The ball and valve seat grinding device comprises a connecting assembly, a ball head connecting rod, a ball head seat, a clamping beam assembly and at least one pair of clamping pieces, the connecting assembly is fixedly connected with an external drilling machine main shaft and is fixedly connected with the outer end of the ball head connecting rod; the ball head end of the ball head connecting rod is in rotating contact with the spherical cavity of the ball head seat; the ball cup is fixedly connected with the clamping beam assembly; the clamping beam assembly is provided with at least one pair of kidney-shaped holes. The pair of waist-shaped holes is arranged oppositely; the clamping piece penetrates through the kidney-shaped hole and is detachably and fixedly connected with a valve seat of an external ball valve. According to the grinding device, the distance between the two clamping pieces can be adjusted by adjusting the