A valve housing having a flow passage therethrough;Ball Valves a spherical ball mounted in said valve housing for movement between an open position and a closed position; tubular caps having connected means for receiving ends of pipelines and abutting against outer end walls of said valve housing, said tubular caps provided with externally extended annular flanges; and cap nuts provided with internally extended annular flanges cooperating with said externally extended annular flanges of the tubular caps and internal threads cooperating with said external threads of the valve housing; said internal threads of the cap nuts being threaded onto the external threads of the valve housing so to firmly connect the valve housing and the tubular caps; said valve housing including: Ball Valvesa tubular valve body terminating at one end with a cylindrical through hole and at the other end with a larger cylindrical through hole; a tubular union adhered inside said larger cylindrical hole of the valve body and having a cylindrical through hole; a valve chamber formed between the valve body and the union, said valve chamber rotatably receiving said ball having a cylindrical through hole;BALL VALVES on the opposite surfaces of the valve body and the union facing the ball annular grooves of rectangular cross-sections are formed, within said annular grooves there being fitted an annular seating ring made polytetrafluoroethylene backed by an annular resilient ring made of elastic rubber so as to urge said seating ring into tight contact with said ball; outer end walls of the valve housing being formed substantially in the shape of convex spherical surfaces having radii centered on the axis of said flow passage, and inner end walls of the tubular caps cooperating with the outer end walls of the valve housing being formed complementary to the convex spherical surfaces of said outer end walls; and inner end walls of the flanges of the cap nuts being formed substantially in the shape of concave spherical surfaces substantially concentric of said outer end walls of the valve housing, and outer end walls of the flanges of the tubular caps being formed complementary to the concave spherical surfaces of said inner end walls.

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