Importance

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Abstract

A ball valve (100) with an improved design of a seat ring (20), the ball valve (100) has a valve body (106) with a ball (102) disposed in a central passage (104) of the valve body (106). The ball (102) has a bore (103) through it for communicating with an inlet port (111) and an outlet port (112) of the present at ends of the central passage (104) of the ball valve (100). A pair of seat ring (20) is provided in the central passage (104) on opposite sides of the ball (102). An improved valve seat ring (20) consists of generally a conical structure having dominantly three surfaces—a dynamic surface (22), a static surface (24) and a free surface (26). There is provided a back cavity (28) which is open from the free surface (26). The dynamic surface (22) transitions from a convex profile to a near flat profile to a concave profile which facilitates a wide pressure band of operation of this ball valve with improved seat ring (20). Construction of back cavity (28) reduces mass and consequently the thermal influence on sealing reliability.

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