초록 ▼

A first valve member has an axis and a first seat surface with a tapered contour facing axially downstream. A second valve member has a second seat surface with a tapered contour facing axially upstream. The second valve member has a closed position in which the second seat surface abuts the first s

A first valve member has an axis and a first seat surface with a tapered contour facing axially downstream. A second valve member has a second seat surface with a tapered contour facing axially upstream. The second valve member has a closed position in which the second seat surface abuts the first seat surface, and has an open position in which the second seat surface is spaced axially downstream from the first seat surface. The second valve member further has a terminal end portion configured as a nose cone. The nose cone may be located entirely downstream of the second seat surface, and may have a cavity with a drain opening.

대표청구항 ▼

1. An apparatus comprising: a flow guide body having a central axis, axially opposite inlet and outlet ends, a cylindrical surface portion reaching axially from the inlet end, and a tapered surface portion reaching axially and radially outward from the cylindrical surface portion toward the outlet e

1. An apparatus comprising: a flow guide body having a central axis, axially opposite inlet and outlet ends, a cylindrical surface portion reaching axially from the inlet end, and a tapered surface portion reaching axially and radially outward from the cylindrical surface portion toward the outlet end;a cylindrical wall surrounding a tubular fluid flow path that reaches over the flow guide body, the cylindrical wall having an outlet end spaced axially upstream from the outlet end of the flow guide body to provide the tubular flow path with an outlet flow area facing radially outward; anda plurality of vanes projecting radially outward from the flow guide body in circumferentially spaced-apart positions dividing the tubular flow path into arcuate segments, with each of the plurality of vanes projecting radially outward to the cylindrical wall and also projecting radially outward to the outlet flow area. 2. An apparatus as defined in claim 1 wherein each of the plurality of vanes reaches axially across the outlet flow area from the outlet end of the cylindrical wall to the outlet end of the flow guide body. 3. An apparatus as defined in claim 1 wherein the tapered surface portion of the flow guide body has an arcuate radial profile. 4. An apparatus comprising: a conduit structure defining a fluid flow path with a section centered on a first axis, a section centered on a second axis orthogonal to the first axis, and a turn between the sections; a pair of opposed valve members that are relatively movable along the first axis between a closed condition blocking the flow path and an open condition spaced apart across a flow area in the flow path;a stem connected between the valve members to move the valve members between the open and closed conditions;an actuator for moving the stem; anda flow directing structure having a bore through which the stem reaches from the actuator to the flow path, and having a planar turn surface that surrounds an opening from which the stem projects from the bore into the turn in the flow path, with the planar turn surface facing into the flow path at acute angles to the first and second axes. 5. An apparatus as defined in claim 4 wherein the planar turn surface is elliptical. 6. An apparatus as defined in claim 4 wherein the flow directing structure comprises a circular cylinder upon which the planar turn surface is an end surface shaped as a cylindric section.