Abstract: A ball valve trim apparatus for high differential pressure service that is resistant to erosion includes elements selected from a plurality of stacked impedance trim plates positioned in the passage of the ball portion of the valve; the plates being independently adjustable along transverse axes that are parallel to the axis of rotation of the ball: one or more of the plates having a convex upstream contour, each plate provided with a predetermined pattern of variously sized fluid passageways, the pattern varying from plate-to-plate in the stack; erosion-resistant bushings inserted into the trim plate holes can be independently rotationally adjustable to control the rate of the flowing fluid, the upstream surface of the plate surrounding the orifice of the bushing defining a raised toroidal body.

Abstract: A ball valve trim apparatus for high differential pressure service that is resistant to erosion includes elements selected from a plurality of stacked impedance trim plates positioned in the passage of the ball portion of the valve; the plates being independently adjustable along transverse axes that are parallel to the axis of rotation of the ball: one or more of the plates having a convex upstream contour, each plate provided with a predetermined pattern of variously sized fluid passageways, the pattern varying from plate-to-plate in the stack; erosion-resistant bushings inserted into the trim plate holes can be independently rotationally adjustable to control the rate of the flowing fluid, the upstream surface of the plate surrounding the orifice of the bushing defining a raised toroidal body.

Abstract: A sealing device (1) for a stem (12) of a valve (10) comprising a metal gasket (4) for the valve (10) stem (12), shaped as a half “U” provided with a single sealing lip (44), which has a radially inner surface (442) and a radially outer surface (444), inclined along the radially inner direction, a wedge metal ring (6) positioned inside the half “U” of the metal gasket (4), an elastic element (7) configured to cooperate with said wedge metal ring (6), the elastic element providing the wedge metal ring with an elastic load and a static sealing ring (8). The elastic element (7) is configured for applying a force to the wedge metal ring (6) such that said wedge metal ring (6) applies a contact pressure to the sole sealing lip (44) of the metal gasket (4) shaped as a half “U”.

Abstract: A sealing device (1) for a stem (12) of a valve (10) comprising a metal gasket (4) for the valve (10) stem (12), shaped as a half “U” provided with a single sealing lip (44), which has a radially inner surface (442) and a radially outer surface (444), inclined along the radially inner direction, a wedge metal ring (6) positioned inside the half “U” of the metal gasket (4), an elastic element (7) configured to cooperate with said wedge metal ring (6), the elastic element providing the wedge metal ring with an elastic load and a static sealing ring (8). The elastic element (7) is configured for applying a force to the wedge metal ring (6) such that said wedge metal ring (6) applies a contact pressure to the sole sealing lip (44) of the metal gasket (4) shaped as a half “U”.

Abstract: A regulation ball valve for a fluid flow in which a ball is rotatable to bring a passage thereof from a limit position of full opening of the valve to a limit position of full closure of the valve and vice versa. Present in the passage are perforated baffles that at least at an intermediate position between the limit positions are passed through by a fluid flow. The perforated baffles include two perforated metal sheets between which a layer permeable to the fluid is disposed. In particular the layer can advantageously be formed of chaotically-disposed filaments as in steel wool.

Abstract: A ball valve for fluids comprises a body (11) provided with an inlet and an outlet (12, 13) and with an inner chamber (14) in which a ball element (15) having a main communication passageway (17) passing through the ball element itself is rotatably received. The ball element is rotatable between an angular position at which the valve is completely closed, said passageway being disposed substantially transverse to the inlet and outlet, and an angular position at which the valve is completely open, said main passageway being aligned with the valve inlet and outlet to create a communication therebetween. The ball element (15) comprises a secondary communication passageway (19) of a reduced section disposed laterally of said main communication passageway. The secondary passageway is designed to bring the valve inlet and outlet into communication with each other when said ball element is in a range of intermediate angular positions between said completely open and completely closed positions.

Abstract: A regulation ball valve for a fluid flow in which a ball is rotatable to bring a passage thereof from a limit position of full opening of the valve to a limit position of full closure of the valve and vice versa. Present in the passage are perforated baffles that at least at an intermediate position between the limit positions are passed through by a fluid flow. The perforated baffles comprise two perforated metal sheets between which a layer permeable to the fluid is disposed. In particular the layer can advantageously be formed of chaotically-disposed filaments, like in steel wool.

Abstract: A ball valve for fluids comprises a body (11) provided with an inlet and an outlet (12, 13) and with an inner chamber (14) in which a ball element (15) having a main communication passageway (17) passing through the ball element itself is rotatably received. The ball element is rotatable between an angular position at which the valve is completely closed, said passageway being disposed substantially transverse to the inlet and outlet, and an angular position at which the valve is completely open, said main passageway being aligned with the valve inlet and outlet to create a communication therebetween. The ball element (15) comprises a secondary communication passageway (19) of a reduced section disposed laterally of said main communication passageway. The secondary passageway is designed to bring the valve inlet and outlet into communication with each other when said ball element is in a range of intermediate angular positions between said completely open and completely closed positions.