Fluid Pressure Control Device Having a Throttling Element Seal

• US 20090057595A1
• Filed: 11/06/2008
• Published: 03/05/2009
• Est. Priority Date: 03/17/2005
• Status: Active Grant

• Current Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Original Assignee: Fisher Controls International LLC (Emerson Electric Company)
• Inventors: Westwater, David J., Micheel, Raymond W.
• Granted Patent: US 8,403,003 B2
• Time in Patent Office: Days
• US Class Current: 251/324
• CPC Class Codes: F16K 25/04 Arrangements for preventing erosion, not otherwise provided for
• CPC Class Codes: F16K 3/246 Combination of a sliding valve and a lift valve
• CPC Class Codes: F16K 47/08 for decreasing pressure or noise level and having a throttling member separate from the closure member , e.g. screens, slots, labyrinths
• CPC Class Codes: Y10T 137/86734 With metering feature
• CPC Class Codes: Y10T 137/86759 Reciprocating
• CPC Class Codes: Y10T 137/86791 Piston
• CPC Class Codes: Y10T 137/86807 Sequential opening or closing of serial ports in single flow line

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.

Claims

1. A fluid flow control device comprising:

a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet;

a valve seat ring coupled to the body and defining an orifice through which the fluid flow path passes;

a cage coupled to the body and defining an interior bore, the cage including at least one passage through which the fluid flow path passes;

a throttling element sized for insertion into the cage interior bore and movable along an axis between open and closed positions, the throttling element defining a sealing surface oriented substantially parallel to the axis; and

a seal 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.

2. The fluid flow control device of claim 1, in which the sealing surface is located on an interior perimeter of the throttling element.

3. The fluid flow control device of claim 1, in which the valve seat ring includes a gland section defining a channel oriented toward the throttling element interior perimeter and sized to receive the seal.

4. The fluid flow control device of claim 1, in which the seal comprises an O-ring.

5. The fluid flow control device of claim 1, in which the throttling element sealing surface has an axial width, and in which the seal engages the sealing surface at any point along the axial width of the sealing surface.

6. A fluid flow control device comprising:

a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet;

a valve seat ring coupled to the body and defining an orifice through which the fluid flow path passes;

a cage coupled to the body and defining an interior bore, the cage including at least one passage through which the fluid flow path passes;

a throttling element sized for insertion into the cage interior bore and movable along an axis between a closed position, in which the throttling element engages the valve seat ring, and an open position, the throttling element defining a sealing surface located on an interior perimeter of the throttling element and oriented substantially parallel to the axis; and

a seal 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.

7. The fluid flow control device of claim 6, in which the throttling element includes a seating surface positioned to engage the valve seat ring when the throttling element is in the closed position, and in which the throttling element sealing surface is separate from the throttling element seating surface.

8. The fluid flow control device of claim 6, in which, when the throttling element is in the closed position, a primary leak path is defined between the throttling element and the cage and extends between the at least one passage of the cage and the valve seat ring fluid flow orifice, and in which the seal is positioned to substantially prevent fluid flow through the primary leak path.

9. The fluid flow control device of claim 6, in which the cage is coupled to the valve seat ring, wherein the cage and valve seat ring define a recess sized to receive the seal.

10. The fluid flow control device of claim 6, in which the throttling element sealing surface has an axial width, and in which the seal engages the sealing surface at any point along the axial width of the sealing surface.

11. A fluid flow control device comprising:

a body defining an inlet, an outlet, and a fluid flow path extending from the inlet to the outlet;

a valve seat ring coupled to the body and defining an orifice through which the fluid flow path passes;

a cage coupled to the body and defining an interior bore, the cage including at least one passage through which the fluid flow path passes;

a throttling element sized for insertion into the cage interior bore and movable along an axis between open and closed positions, the throttling element defining a sealing surface located on an interior perimeter of the throttling element and oriented substantially parallel to the axis; and

a seal 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.

12. The fluid flow control device of claim 11, in which, when the throttling element is in the closed position, a primary leak path is defined between the throttling element and the cage and extends between the at least one passage of the cage and the valve seat ring fluid flow orifice, and in which the seal is positioned to substantially prevent fluid flow through the primary leak path.

13. The fluid flow control device of claim 11, in which the valve seat ring includes a gland section defining a channel oriented toward the throttling element interior perimeter and sized to receive the seal.

14. The fluid flow control device of claim 11, in which the throttling element sealing surface has an axial width, and in which the seal engages the sealing surface at any point along the axial width of the sealing surface.