Top entry ball valve

A top entry ball valve consists of a housing having an interior cavity sufficiently large to receive a conventional ball and conventional seat rings through an opening in the housing. A cam arrangement is used to axially load the seat rings, after the ball/seat package has been inserted into the cavity. The cam arrangement comprises a pair of circular cams, each having an undulating annular surface, which is disposed in the housing cavity adjacent one of the seat rings with the respective undulating annular surfaces of the cams being in closely adjacent facing relation to one another. After assembly of the valve, one of the circular cams is rotated relative to the other cam to vary the rotational positions of the undulating annular surfaces relative to one another thereby to vary the axial positions of the circular cams relative to one another and relative to the ball and seat rings.
Top entry ball valve, Top entry ball valves are of integral top loading types, so it’s unnecessary to disassemble them from the pipes. Just remove the cover, you can repair them and change the spare parts to make the maintenance much easier.