Valve rod shaft shoulder and blowout prevention shaft sleeve combination of floating ball valve and installation method of valve rod shaft shoulder and blowout prevention shaft sleeve combination

The invention relates to a combination of a valve rod shaft shoulder and a blowout prevention shaft sleeve of a floating ball valve, which comprises a valve rod, the end part of the valve rod is sequentially provided with a second column body with the diameter of d2 and a first column body with the diameter of d1, and the d2 is smaller than the d1; planes with the width of k are machined on the two sides of the first column body and the second column body in the axial direction; the blowout prevention shaft sleeve comprises a ring body, and the inner diameter of the ring body is d1; the two support lugs are symmetrically arranged on the ring body, and the width of each support lug is k; the two steps are symmetrically arranged on the inner ring of the ring body, the inner ring of the ring body forms a long circle, and the distance between the two steps is d2; the plane of the valve rod is inserted into the blowout prevention shaft sleeve along the step of the blowout prevention shaft sleeve, after the second