Abstract: A fluid valve includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. A valve seat is disposed within the fluid passageway. A fluid control member is movably disposed within the fluid passageway, the fluid control member cooperating with a trim assembly to control fluid flow through the fluid passageway. The valve seat is clamped into the valve body and the fluid valve operates under choked flow at a pressure drop of 10% or less of the inlet fluid pressure.

Abstract: A fluid valve includes a valve body having a fluid inlet and a fluid outlet connected by a fluid passageway. A valve seat is disposed within the fluid passageway. A fluid control member is movably disposed within the fluid passageway, the fluid control member cooperating with a trim assembly to control fluid flow through the fluid passageway. The valve seat is clamped into the valve body and the fluid valve operates under choked flow at a pressure drop of 10% or less of the inlet fluid pressure.

Abstract: Methods and apparatus to align a seat ring in a valve are described. An example fluid valve includes a valve body having a curved internal surface to receive a seat ring and a seat ring having a sealing surface to receive a movable control member and a curved surface opposite the sealing surface to engage the curved internal surface of the valve body.

Abstract: A fluid flow control device includes a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet. A valve seat ring is coupled to the body and defines an orifice through which the fluid flow path passes. A cage is also coupled to the body and defines an interior bore, wherein the cage includes at least one passage through which the fluid flow path passes. A throttling element is sized for insertion into the cage interior bore and movable along an axis between open and closed positions. The throttling element defines a sealing surface oriented substantially parallel to the axis. A seal is positioned to engage the sealing surface when the throttling element is substantially in the closed position, thereby to restrict fluid flow through the valve seat ring orifice.

Abstract: Methods and apparatus to align a seat ring in a valve are described. An example fluid valve includes a valve body having a curved internal surface to receive a seat ring and a seat ring having a sealing surface to receive a movable control member and a curved surface opposite the sealing surface to engage the curved internal surface of the valve body.

Abstract: Methods and apparatus to align a seat ring in a valve are described. An example fluid valve includes a valve body having a curved internal surface to receive a seat ring and a seat ring having a sealing surface to receive a movable control member and a curved surface opposite the sealing surface to engage the curved internal surface of the valve body.

Abstract: A fluid flow control device includes a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet. A valve seat ring is coupled to the body and defines an orifice through which the fluid flow path passes. A cage is also coupled to the body and defines an interior bore, wherein the cage includes at least one passage through which the fluid flow path passes. A throttling element is sized for insertion into the cage interior bore and movable along an axis between open and closed positions. The throttling element defines a sealing surface oriented substantially parallel to the axis. A seal is positioned to engage the sealing surface when the throttling element is substantially in the closed position, thereby to restrict fluid flow through the valve seat ring orifice.

Abstract: Methods and apparatus to align a seat ring in a valve are described. An example fluid valve includes a valve body having a curved internal surface to receive a seat ring and a seat ring having a sealing surface to receive a movable control member and a curved surface opposite the sealing surface to engage the curved internal surface of the valve body.

Abstract: A fluid flow control device includes a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet. A valve seat ring is coupled to the body and defines an orifice through which the fluid flow path passes. A cage is also coupled to the body and defines an interior bore, wherein the cage includes at least one passage through which the fluid flow path passes. A throttling element is sized for insertion into the cage interior bore and movable along an axis between open and closed positions. The throttling element defines a sealing surface oriented substantially parallel to the axis. A seal is positioned to engage the sealing surface when the throttling element is substantially in the closed position, thereby to restrict fluid flow through the valve seat ring orifice.

Abstract: A valve includes a fluid inlet passageway coupled to a fluid outlet passageway through an orifice and a valve plug that is moveable with respect to the orifice to vary the rate of fluid flow through the orifice. A seat ring is disposed at the orifice and includes a structural member having three vanes connected in a Y-shaped configuration extending into the fluid inlet passageway adjacent the orifice. The Y-shaped vane configuration prevents disturbances, such as intermittent vortices, from forming within the fluid in the fluid inlet passageway and, thereby, provides a stable rate of fluid flow through the valve.

Abstract: A valve includes a fluid inlet passageway coupled to a fluid outlet passageway through an orifice and a valve plug which is moveable with respect to the orifice to vary the rate of fluid flow through the orifice. A seat ring is disposed at the orifice and includes a structural member extending into the fluid inlet passageway adjacent the orifice which prevents disturbances, such as intermittent vortices, from forming within the fluid in the fluid inlet passageway and which, thereby, provides a stable rate of fluid flow through the valve. The structural member may, alternatively, be connected to the valve plug or a wall of the fluid inlet passageway.

Abstract: A fluid control valve for use in severe erosive fluid conditions which includes a ceramic plug seat. The ceramic plug seat is mounted to a metal valve element using a tapered mechanical bolt. The tapered portion of the mechanical bolt matches a cone-shaped interior surface portion within the ceramic plug to uniformly distribute the mounting forces within the ceramic plug to prevent cracking of the ceramic plug.