A union-type ball valve comprising: a valve body having a fluid passage therethrough; at least one connecting sleeve having a flange portion at an end thereof and at least one union nut for releasably joining said connecting sleeve to said valve body;Ball Valves a ball with a spindle, said ball and spindle being arranged in said valve body to enable said fluid passage through said valve body to be selectively opened or closed; Ball Valvesa valve seat formed integrally with the inner wall of said valve body, said valve seat having at least two concave valve seat portions contacting opposite portions of the outer periphery of said ball, said opposite portions of said outer periphery being positioned such that the rotational axis of said spindle passes through each of said outer periphery portions, BALL VALVESsaid ball being retained by said two concave seat portions such that ball blow out is prevented when said fluid passage is closed in the presence of fluid pressure on one side of said ball and the connecting sleeve is disconnected from said valve body on the opposite side of said ball; at least one seal carrier and a respective seal positioned between said connecting sleeve and said ball, said seal carrier abutting the flanged end of said connecting sleeve, said seal abutting a portion of the outer periphery of said ball not in contact with said seat and said seal carrier, such that as said union nut moves said connecting sleeve toward said valve body the sealing engagement between the seal and ball is increased.

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