A choke valve body of a valve apparatus includes a lower stem that terminating at a lower end thereof with a plug. A conduit traverses a lower portion of the lower stem between at least one plug aperture traversing the plug to at least one top aperture traversing an upper end of the lower portion. T
A choke valve body of a valve apparatus includes a lower stem that terminating at a lower end thereof with a plug. A conduit traverses a lower portion of the lower stem between at least one plug aperture traversing the plug to at least one top aperture traversing an upper end of the lower portion. The lower portion is slidably retained within the valve chamber between closed and open positions. A bonnet fixed with the valve body has a bonnet chamber for receiving the lower portion, and a bore with at least one annular seal for slidably retaining an upper portion. A yoke assembly is fixed with the bonnet, terminates at an upper end with a drive mechanism, and includes an upper stem with a threaded upper end that is driven between raised and lowered positions by the drive mechanism, the upper stem fixed with the lower stem.
대표청구항▼
1. A choke valve apparatus for controlling the flow of fluid between a source and a receiver, comprising: a choke valve body having a choke valve chamber with an inlet and an outlet; a seat disposed within the choke valve chamber;a lower stem having an upper portion and a lower portion, the lower po
1. A choke valve apparatus for controlling the flow of fluid between a source and a receiver, comprising: a choke valve body having a choke valve chamber with an inlet and an outlet; a seat disposed within the choke valve chamber;a lower stem having an upper portion and a lower portion, the lower portion having an upper end and a lower end and terminating at the lower end thereof with a plug, a conduit traversing the lower portion between at least one plug aperture traversing the plug to at least one top aperture traversing the upper end of the lower portion, the lower portion slidably retained at least partially within the choke valve chamber between a closed position wherein the plug abuts the seat to prevent fluid flow between the inlet and the outlet, and an open position wherein the plug is axially retracted from the seat to permit fluid flow between the inlet and the outlet, the conduit venting the choke valve chamber in the closed position;a bonnet selectively fixed with the choke valve body and having a bonnet chamber axially aligned with the lower portion for receiving the lower portion at least partially and slidably therein, the bonnet including a bore axially aligned with the lower portion, the bore including at least one annular seal, the conduit comprising a flowpath having openings only at the top aperture positioned within the bonnet chamber and the at least one plug aperture;the upper portion of the lower stem axially aligned with and fixed at a lower end thereof with the upper end of the lower portion, the upper portion slidably retained within the bore of the bonnet and the annular seal, the upper portion being at most one-half of the diameter of the lower portion; anda yoke assembly selectively fixed at a lower end thereof with the bonnet and terminating at an upper end thereof with a rotational drive mechanism, the yoke assembly including an upper stem axially aligned with the lower stem and having a threaded upper end and a lower end fixed with the upper end of the upper portion of the lower stem, the rotational drive mechanism including an internally-threaded rotational drive shaft that captures and drives the threaded upper end of the upper stem between a raised position corresponding with the open position of the plug and lowered position corresponding to the closed position of the plug;whereby the bonnet chamber at the lower end of the upper portion of the lower stem is always in fluid communication with the inlet through the at least one top aperture of the upper end of the lower portion, the conduit, and the at least one plug aperture such that the fluid pressure at the upper portion of the lower stem in substantially equal to the fluid pressure at the inlet, the annular seal preventing the fluid from leaking between the upper portion of the lower stem and the bore of the bonnet. 2. The choke valve apparatus of claim 1 wherein the plug is a generally conical choke-type plug. 3. The choke valve apparatus of claim 2 wherein the plug and seat are both made from a relatively hard carbide material embedded in a jacket comprised of a nickel or chrome-based material. 4. The choke valve apparatus of claim 1 wherein the plug is a generally cylindrical gate-type plug. 5. The choke valve apparatus of claim 4 wherein the plug and seat are both made from a relatively hard carbide material embedded in a jacket comprised of a nickel or chrome-based material. 6. The choke valve apparatus of claim 1 wherein the lower portion of the lower stem is axially maintained within the choke valve chamber with at least one annular U-ring situated between the at least one top aperture and the at least one plug aperture. 7. The choke valve apparatus of claim 1 wherein the bonnet is selectively fixed with a threaded portion of the choke valve body at a metal-to-metal seal by a wing nut, the metal-to-metal seal preventing the fluid from leaking between the choke valve body and the bonnet when the wing nut is tightened. 8. The choke valve apparatus of claim 1 wherein the bore of the bonnet further including a threaded, annular packing nut through which the upper portion of the lower stem is slidably retained, the bore including a packing nut thread for engaging the packing nut, whereby the annular seal may be accessed and lubricated from outside of the bonnet by removing the packing nut. 9. The choke valve apparatus of claim 1 wherein a yoke assembly is selectively fixed with a top side of the bonnet at a yoke support plate of the bonnet. 10. The choke valve apparatus of claim 1 wherein the yoke assembly includes a yoke having at least one slot therein aligned with the upper and lower stems, the at least one slot adapted for slidably capturing a shoulder bolt therein, the shoulder bolt transversely engaged with the upper and lower stems to prevent rotation of the upper and lower stems by the drive shaft, whereby rotary motion is converted to linear motion. 11. The choke valve apparatus of claim 10 wherein the yoke assembly further includes an outer indicator sleeve fixed with the upper stem and an inner indicator fixed with the yoke assembly and within the indicator sleeve, whereby as the upper stem moves from the raised position to the lowered position the indicator sleeve moves away from the indicator to reveal progressively more of the indicator, the indicator having indicia thereon corresponding to the position of the plug within the seat. 12. The choke valve apparatus of claim 1 wherein the rotational drive mechanism further includes a thrust assembly disposed about the drive shaft that includes at least one thrust bearing to prevent axial movement of the drive shaft while facilitating rotational movement of the drive shaft. 13. The choke valve apparatus of claim 12 wherein the drive shaft terminates at a top end thereof with a nut, whereby a handle wrench or wheel may be used to rotate the nut to move the choke valve apparatus between the closed and open positions. 14. The choke valve apparatus of claim 12 wherein the drive shaft terminates at an actuator coupling, whereby an electrically-driven choke valve actuator engaged with the actuator coupling may be used to remotely move the choke valve apparatus between the closed and open positions. 15. The choke valve apparatus of claim 1 wherein the lower end of the upper stem is selectively fixed with the upper end of the upper portion of the lower stem at a coupler. 16. The choke valve apparatus of claim 1 wherein the choke valve seat is selectively fixed within the choke valve body at a metal-to-metal seal by a treaded arrangement, the metal-to-metal seal preventing the fluid from leaking between the choke valve seat and the choke valve body when the choke valve seat is tightened within the choke valve body. 17. The choke valve apparatus of claim 1, further comprising a breakaway coupler releasably joining the lower end of the upper stem with the upper end of the upper portion of the lower stem, said breakaway coupler releasing the rotational drive mechanism at a preferred torque threshold limit. 18. The choke valve apparatus of claim 17, wherein the breakaway coupler comprises a frictional sleeve fixed to the upper end of the upper portion of the lower stem, said frictional sleeve having a frictional engagement limit corresponding to the preferred torque threshold limit.
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이 특허에 인용된 특허 (12)
Tsai Chun-Tie (P.O. Box 96-405 Taipei 10098 TWX), Auxiliary assembly for improving the combustion efficiency of an engine.
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