Abstract: A ball valve and a method for fabricating this ball valve wherein a ball seat, formed of a synthetic resin, is mounted at each end of a flow passage in a ball of the valve. A sealing end portion of the ball seat contacts the spherical surface of the ball only in the closed position of the ball. In the open position, the lip falls within a recess surrounding the end of the flow passage in the ball. A gap of 0.3 to 0.7 mm is formed, in the open position, between the wall surface of the recess and the end of the lip. The end of the lip should fall, in the open position of the ball, about 0.2 mm inside an imaginary continuation of the surface of the ball at the recess.

Abstract: A ball valve and a method for fabricating this ball valve wherein a ball seat, formed of a synthetic resin, is mounted at each end of a flow passage in a ball of the valve. A sealing end portion of the ball seat contacts the spherical surface of the ball only in the closed position of the ball. In the open position, the lip falls within a recess surrounding the end of the flow passage in the ball. A gap of 0.3 to 0.7 mm is formed, in the open position, between the wall surface of the recess and the end of the lip. The end of the lip should fall, in the open position of the ball, about 0.2 mm inside an imaginary continuation of the surface of the ball at the recess.

Abstract: A ball valve is provided which comprises a valve body formed from a tubular member with a cylindrical hole extending therethrough, a stem having one end thereof projecting into the hole, and a ball fixed to an end of the stem. The ball has a circular bore extending diametrically therethrough, wherein the ball is spherical in shape with removed chordal segments corresponding to the bore. A seat carrier is inserted in the hole, the seat carrier having one end adjacent the ball, a connecting sleeve contacts the seat carrier at the other end thereof opposite the end adjacent the ball, and a union nut couples the connecting sleeve to the valve body. Diametrically opposed projections are provided on the inner surface of the valve body, the projections extending into the hole, recesses formed on the side of the seat carrier adjacent the one end thereof, and diametrically opposed grooves are formed in the side of the seat carrier adjacent the recesses.

Abstract: A ball valve is provided which comprises a valve body formed from a tubular member with a cylindrical hole extending therethrough, a stem having one end thereof projecting into the hole, and a ball fixed to an end of the stem. The ball has a circular bore extending diametrically therethrough, wherein the ball is spherical in shape with removed chordal segments corresponding to the bore. A seat carrier is inserted in the hole, the seat carrier having one end adjacent the ball, a connecting sleeve contacts the seat carrier at the other end thereof opposite the end adjacent the ball, and a union nut couples the connecting sleeve to the valve body. Diametrically opposed projections are provided on the inner surface of the valve body, the projections extending into the hole, recesses formed on the side of the seat carrier adjacent the one end thereof, and diametrically opposed grooves are formed in the side of the seat carrier adjacent the recesses.