BALL VALVE

摘要

The present invention comprises a seat spring installed at a rear surface of a seat retainer and allows a spring force applied to a side surface of the seat retainer to be acted more strongly than an upper and lower portion so that pushes the side surface more strongly, and forms a groove in inner side of a seat ring of a seat retainer so that according to a fluid pressure, when deformation of a ball is generated, a same fluid pressure is applied into a the groove followed by the deformation of the ball seat portion is deformed, such that seat springs, which are intensely arranged on the seat portion corresponding to a side surface portion of the ball, pushes more harder and a deformation occurs in the seat portion and even when the ball geometrically and non-uniformly deformed to be concave such as an egg-like shape, the seat retainer is deformed to a corresponding form, thereby a gap is eliminated between the ball and the seat retainer, thus improves sealing function.