A labor-saving and durable ultra-high pressure manual wedge throttle valve

Abstract

A labor-saving and durable ultra-high pressure manual wedge throttle valve. The valve body is a #imgabs0#-type four-way structure. Inside and outside the valve cavity hole above it, there are valve cover components, valve stem and spool components, bracket components, drive components, and display components. Among them, the drive component is a common manual bevel gear driver, using the valve stem nut in the center of the large bevel gear to drive the valve stem and spool components to move up and down. The display component installed at the top of the valve stem and the upper end of the drive component displays the equivalent aperture of the valve opening and closing. Inside the channel hole below it, there is a valve seat component. The valve seat is made of cemented carbide material, thick at the top and thin at the bottom, and its length runs through the entire channel hole below the valve body. On its left side, there is an inlet channel hole and an external connection flange, and on its right side, there is a newly designed return hole, and a blind flange with a cemented carbide module is installed at the hole opening. In addition, a T-shaped pressure balance hole is drilled upward on the lower end face of the valve cover, and together with the overall improvement of the used seals, it has excellent ultra-high pressure resistance performance.

Description

Technical Field

[0001] The present invention relates to a "wedge throttle valve" used in oil machinery and other industrial industries. Background Art

[0002] The wedge throttle valve is welcomed by more and more customers for its characteristics such as smooth flow, small vibration, low noise, accurate measurement, and long service life. Especially in drilling and production equipment where oil and gas wells are drilled deeper and the working pressure is higher, its usage is also increasing. However, for existing wedge throttle valve products, when working under ultra-high pressure above 100 MPa, some obvious problems will occur: First, the opening and closing resistance of the valve is very large, and manual operation is difficult. If hydraulic drive is used instead, the cost is very high; Second, for the existing valve body, under the impact of ultra-high pressure sand-containing medium, the side facing the inlet will quickly wear out and be scrapped, shortening the service life of the product; Third, for the commonly used short valve seats, it is difficult to protect the channel holes under the valve seats under the impact of ultra-high pressure sand-containing medium, and it is also difficult to replace the valve seats themselves after wear. Therefore, it is necessary to improve the performance and service life of the wedge throttle valve under ultra-high pressure working conditions. Summary of the Invention

[0003] The purpose of the present invention is to carry out innovative design on the basis of existing product technologies in view of the above problems and special working conditions, so as to improve the performance and service life of the wedge throttle valve product in dealing with ultra-high pressure sand-containing medium.

[0004] The present invention is composed of a valve body component, a valve cover component, a valve stem and spool component, a bracket component, a drive component, a display component, a valve seat component and supporting seals and connectors. The difference is that the valve body in the valve body component is a four-way structure of type

[0005] In addition, in the present invention, a T-shaped pressure balance hole is drilled upward from the lower end surface of the valve cover, and an FS-type sealing ring made of corrosion-resistant material is used for sealing at the lower end of the valve cover. Metal sealing gasket rings are used for sealing at the joints between the valve body and the valve cover, the blind flange and its external flange.

[0006] Since the present invention adopts a manual bevel gear driver, by utilizing the lever effect of its transmission ratio, the operating resistance can be greatly reduced. In addition, the pressure balance hole at the lower end of the valve cover can reduce the pressure difference between the upper and lower parts of the valve core and the resistance of compressed air, enabling the ultra-high pressure throttle valve to be easily operated. Opposite to the inlet passage of the valve body, a return hole penetrating the valve body is machined. On the valve body outside the return hole, a blind flange with a cemented carbide module is installed, and replaceable wear-resistant parts are used to withstand the erosion of ultra-high pressure sand-containing medium, preventing the valve body from being damaged prematurely. The valve seat in the valve seat component is made of cemented carbide material, thick at the top and thin at the bottom, and its length runs through the entire passage hole below the valve body, making it more convenient for replacement and maintenance while improving its wear resistance. FS-type sealing rings are used for sealing at the lower ends of the valve covers, and metal sealing gasket rings are used for sealing at the joints between the valve body and the valve cover, the blind flange and its external flange, improving the overall pressure resistance and corrosion resistance of the throttle valve. Brief Description of the Drawings

[0007] Figure 1 is a full-sectional schematic view of the overall structure of the present invention;

[0008] Figure 2 is the present invention Figure 1 is a schematic view of the A-A cross-section at the joint of the valve body, valve cover and valve stem in the present invention;

[0009] Figure 3 is a partially enlarged sectional view of the contact between the sealing component and the valve stem in the valve cover component of the present invention;

[0010] Figure 4 is the present invention Figure 1 is a partially enlarged sectional view of the inner sealing ring at position B in the valve cover component in the present invention;

[0011] Figure 5 is the present invention Figure 1 is an enlarged view of the bottom surface of the valve core part in the C direction in the present invention;

[0012] Figure 6 is the present invention Figure 1 is an enlarged view of the radius expansion of the marked content on the D-direction indicating rod in the present invention.

[0013] The names of the components indicated by the reference numerals in the drawings are as follows:

[0014] 1. Valve body, 2. Valve core, 3. Valve stem, 4. Valve cover, 5. Bracket, 6. Manual bevel gear drive, 7. Sealing gasket, 8. Through-hole top cover, 9. Indicator rod, 10. Spring washer, 11. Flat washer, 12. O-ring seal, 13. Valve stem nut, 14. Connecting bolt, 15. Sealing assembly, 16. Set screw, 17. Pressure relief valve, 18. Cylindrical pin, 19. Socket head cap screw, 20. Outer sealing ring, 21. Cemented carbide module, 22. Blind flange, 23. Inner sealing ring, 24. Sealing gasket ring, 25. Stud nut, 26. Compression nut, 27. Valve seat. Detailed implementation mode

[0015] The following further explains the detailed implementation mode of the present invention in conjunction with the attached drawings:

[0016] Figure 1 In this invention, the valve body component is used as a carrier, and the valve cover component, valve stem and valve core component, bracket component, drive component, display component and valve seat component are connected by matching seals and connectors to form a functional unit with the function of regulating flow rate under the working conditions of ultra-high pressure and sand-containing medium.

[0017] The valve body component of the present invention is composed of a valve body 1, a cemented carbide module 21, a blind flange 22, a sealing gasket ring 24 and a stud nut 25. The valve body 1 is a four-way structure part of type

[0018] Figure 1 and Figure 2In the valve cover component of the present invention, it is composed of a valve cover 4, a sealing assembly 15, a pressure relief valve 17, a cylinder head screw 19, an outer sealing ring 20, and an inner sealing ring 23. In the valve cover component: The center of the valve cover 4 is a multi-step through hole that is thick at both ends and thin in the middle. The step hole with an internal thread at the inlet is located at the upper end, which is used to install the sealing assembly 15; the smooth cylindrical hole with a groove at the inlet is located at the lower end, which is used to install the inner sealing ring 23 and the valve stem 3. The upper end of the valve cover 4 is a stud with an external thread and a relief groove, which is used to connect the support component; in the middle is a large-diameter connecting flange. Below the connecting flange, a trapezoidal gasket ring groove and evenly distributed stud holes are processed, which are used to connect with the valve body 1; a radial step hole with a thread at the inlet is processed on the circumference of the flange, and the pressure relief valve 17 is installed at the orifice; the lower end is a hollow cylinder with a conical surface. On the outer surface below the cylinder, a groove is processed, and the outer sealing ring 20 is installed in the groove; above the groove, two radial threaded holes for installing the cylinder head screw 19 are symmetrically processed, which are used to prevent the valve stem from rotating; on the side wall of the lower end of the valve cover 4 with the conical surface facing upward, a T-shaped pressure balance hole is drilled. The pressure balance hole passes through the outer sealing ring 20 and the inner sealing ring 23. The outer orifice at the upper end is located on the outer circumference of the valve cover 4, and the inner orifice at the upper end communicates with the central hole of the valve cover 4, so as to keep the pressure in the cylindrical hole at the lower section of the valve cover 4 balanced with the pressure in the valve cavity, thereby reducing the opening and closing torque of the throttle valve and the axial force on the outer sealing ring 20 and the inner sealing ring 23. The pressure relief valve 17 of the present invention is installed on the circumference of the connecting flange of the valve cover 4 and communicates with the valve cavity through the gap between the valve stem 3 and the valve cover 4 and the T-shaped pressure balance hole, so as to discharge the remaining pressure in the valve body 1 during maintenance.

[0019] Figure 1 and Figure 3 In the valve cover component, the sealing assembly 15 is stacked from top to bottom by a metal cap, a sealing ring with a square V-groove cross-section, a sealing ring with a symmetric wing-shaped cross-section, a composite sealing ring with a bell-shaped cross-section, and a retaining ring with a ⊥-shaped cross-section; the three sealing rings and one retaining ring are all molded from engineering plastics of "polyether ether ketone (code: PEEK) or polytetrafluoroethylene (code: PTFE)". Inside the inner cavity of the composite sealing ring with a bell-shaped cross-section, a ring-shaped metal spring with a top bent into an arc and a V-shaped cross-section is also installed to prevent the ultra-high pressure in the valve cavity from leaking from the valve stem 3.

[0020] Figure 1 and Figure 4 In the valve cover component, both the outer sealing ring 20 and the inner sealing ring 23 adopt FS-type elastic sealing rings; the main material of the FS sealing ring is "FKM fluororubber" or "HNBR highly saturated hydrogenated nitrile rubber". On both shoulders of the convex end, an elastic steel wire ring is inlaid respectively to improve its pressure resistance.

[0021] Figure 1 andFigure 5 In the present invention, the valve stem valve core component is composed of a valve core 2, a valve stem 3 and a cylindrical pin 18, and is installed in the center hole of the valve cover component, the bracket component and the driving component. The valve core 2 is made of hard alloy material, and the upper end is a cylinder with a thinner diameter, and a radial through hole is drilled on the cylinder; the lower end is a cylinder with a thicker diameter, and a wedge surface is processed upward from the lower end surface; the wedge surface is an arc-shaped concave surface, and the cross section of the wedge surface is from top to bottom, from surplus to deficit, and finally presents a crescent shape, so as to maintain the cylindrical shape of the medium flow as much as possible. The upper section of the valve stem 3 is a stud, which is connected to the valve stem nut 13; the middle section is a smooth cylinder with a slightly thicker diameter, which is convenient for the sealing assembly 15 to seal; the lower section is a cylinder with a thicker diameter, and two symmetrical semi-through axial long grooves are milled on the thickened cylinder, which slide and cooperate with two symmetrical cylindrical end screws 19 radially installed on the hollow cylinder at the lower end of the valve cover 4 to prevent the valve stem 3 from rotating; the lower end of the thickened cylinder is also processed with an axial blind hole and a radial pin hole, which is connected and fixed with the upper end of the valve core 2. A threaded blind hole is also processed on the upper end face of the valve stem 3, which is connected with the indicator rod 9 in the display component to output the opening and closing information of the valve.

[0022] The bracket component of the present invention is composed of a bracket 5 and a set screw 16. The bracket 5 is a T-shaped structure part, with a through step hole in the center, and a threaded hole with a large diameter at the lower end of the step hole, which is connected to the upper end of the valve cover 4; the upper end is a cylindrical hole with a smaller diameter, which serves as a partial accommodation for the valve stem 3. The upper end of the bracket 5 is a flange with a large diameter, and the flange is connected to the manual bevel gear driver 6 with connecting bolts 14 through evenly distributed bolt holes; the lower end is a hollow cylinder with a reduced diameter, and two small threaded holes are symmetrically drilled at the lower edge of the hollow cylinder, and a set screw 16 is installed in each of the small threaded holes to prevent the bracket 5 and the valve cover 4 from deflecting after assembly.

[0023] The driving component of the present invention adopts a universal manual umbrella gear driver 6, which is composed of a hand wheel, a pair of large and small umbrella gears, bearings, valve stem nuts 13, end covers, housings, bottom cover plates, and matching seals and connectors. The bottom cover plate has evenly distributed threaded holes for connecting and fixing with the bracket 5; a threaded hole with a larger diameter is opened on the top of the housing, which can be used to install a top cover, a display component or other components. The valve stem nut 13 of the present invention is modified from the large umbrella gear shaft in the manual umbrella gear driver 6; its upper end is a cylindrical body with a step, which is connected to the thrust bearing in the housing; its lower end is a spline column, which is installed in the spline hole in the center of the large umbrella gear; the through hole in the center is processed into a cylindrical hole in the upper half and a threaded hole in the lower half, which is connected to the stud in the upper section of the valve stem 3 to convert the rotational motion of the umbrella gear into the axial motion of the valve stem valve core component.

[0024] Figure 1 and Figure 6In the present invention, the display component consists of a sealing gasket 7, a through-hole top cover 8, an indicating rod 9, a spring washer 10, a flat washer 11 and an O-ring 12. The through-hole top cover 8 can be modified using the original top cover in the manual bevel gear driver 6: change the blind hole in its center into a cylindrical through-hole with a groove cut at the upper opening, and install the indicating rod 9 and the O-ring 12 inside; keep the circular cover plate with a larger diameter at its upper end and the stud body with a relief groove at its lower end unchanged. After adding the sealing gasket 7, it is connected and sealed with the threaded hole above the housing of the manual bevel gear driver 6. The main body part of the indicating rod 9 is a cylinder with the same diameter. A hexagonal blind hole is machined at its upper end for disassembly and assembly with a wrench; the lower end is machined into a reduced-diameter screw head. After installing the spring washer 10 and the flat washer 11, it is connected and fixed to the threaded blind hole at the upper end of the valve stem 3 and moves up and down under the drive of the valve stem 3. On the outer cylindrical surface of the indicating rod 9, ten equally spaced horizontal position lines are engraved, and the text "φXX.Xmm" is correspondingly engraved above each position line; the numerical value in each group of text starts from "φ0.0mm", arranges vertically from top to bottom, and increases row by row; the above text is evenly distributed in three or four groups on the circumference of the indicating rod for observation from different directions. The lifting indicating rod 9 uses the relative position between the horizontal position line on its outer surface and the upper plane of the through-hole end cover 8 to display the opening and closing degree and equivalent aperture of the throttle valve, so that users can calculate the flow rate according to the on-site medium conditions.

[0025] The valve seat component of the present invention consists of a compression nut 26 and a valve seat 27. The center of the compression nut 26 is machined into a stepped hole with a larger diameter at the lower part and a smaller diameter at the upper part for pressing the circular step at the upper end of the valve seat 27 to prevent it from floating up; the outer circle is machined into a stud body and is connected and fixed to the threaded stepped channel hole in the lower part of the valve body 1; on the upper end face of the compression nut 26, 4 blind holes are symmetrically drilled for easy disassembly and assembly with tools. The valve seat 27 is made of hard alloy material and is a hollow cylinder with a thicker upper part and a thinner lower part. It is fixed in the valve body 1 under the clamping of the compression nut 26, and its length runs through the entire channel hole below the valve body 1, which not only improves its wear resistance but also facilitates replacement after wear.

Claims

1. An energy-saving and durable ultra-high pressure manual wedge throttle valve is composed of a valve body component, a valve cover component, a valve stem and valve core component, a bracket component, a driving component, a display component, a valve seat component and matching seals and connectors. Its characteristics are as follows: The valve body in the valve body part is a ┝-shaped four-way structure: the valve cover part, valve stem and valve core part, bracket part, driving part and display part are installed inside and outside the valve cavity hole above it, and the driving part is a universal manual bevel gear driver, which drives the valve stem and valve core part to move up and down with the valve stem nut in the center of the large bevel gear; the display part installed on the top of the valve stem and valve core part and the upper end of the manual bevel gear driver housing uses the relative position of the horizontal position line on the outer surface of the indicator rod and the upper end plane of the through hole end cover to display the equivalent aperture of the valve opening and closing; below it is the channel hole and the neck flange connected to the outside, and the valve seat part is installed in the channel hole. The valve seat in the valve seat part is made of hard alloy material, thick at the top and thin at the bottom, and the length runs through the entire channel hole below the valve body; On the left side is the channel hole for the medium inlet, which is connected to the outside through a neck flange; On the right side is a newly designed reflux hole, with a blind flange inlaid with a carbide module installed at the orifice; The sealing assembly in the valve cover is composed of a metal pressure cap, a sealing ring with a square V-groove section, a sealing ring with a symmetrical wing section, a composite sealing ring with a bell-shaped section, and a retaining ring with a ⊥-shaped section. In the inner cavity of the composite sealing ring with a bell-shaped section, there is also an annular metal spring with a top bent into a circular arc and a V-shaped section. In the valve cover component: a T-shaped pressure balance hole is drilled on the upward side wall of the cone surface at the lower end of the valve cover. The pressure balance hole passes the outer sealing ring and the inner sealing ring. The outer opening at the upper end is located on the outer circumference of the valve cover, and the inner opening at the upper end is connected to the center hole of the valve cover.

2. The ultra-high pressure manual wedge throttle valve according to claim 1, characterized in that: Steel sealing rings are used at the joints between the upper end face of the valve body and the valve cover, and between the right side face of the valve body and the blind flange, and are sealed under the extrusion of the stud nuts.

3. The ultra-high pressure manual wedge throttle valve according to claim 1, characterized in that: In the valve cover component: the pressure relief valve is installed on the circumference of the connecting flange of the valve cover, and is connected to the valve cavity through the gap between the valve stem and the valve cover and the T-shaped pressure balance hole.

4. The ultra-high pressure manual wedge type throttle valve according to claim 1, characterized in that: The sealing components, three-layer sealing rings and one-layer retaining ring in the valve cover are all molded by engineering plastics such as "polyetheretherketone (code: PEEK) or polytetrafluoroethylene (code: PTFE).

5. The ultra-high pressure manual wedge throttle valve according to claim 1, characterized in that: The outer sealing ring and the inner sealing ring in the valve cover component are both FS-type elastic sealing rings; the main material of the FS-type elastic sealing ring is "FKM fluororubber" or "HNBR highly saturated hydrogenated nitrile rubber", and an elastic steel wire ring is inlaid on each shoulder of its raised end.

6. The ultra-high pressure manual wedge throttle valve according to claim 1, characterized in that: The valve core is made of cemented carbide material. The upper end is a cylinder with a smaller diameter and a radial through hole drilled on the cylinder. The lower end is a cylinder with a larger diameter and a wedge surface is processed upward from the lower end surface. The wedge surface is an arc-shaped concave surface, and the cross-section of the wedge surface is from top to bottom, from surplus to deficit, and finally presents a crescent shape.

7. The ultra-high pressure manual wedge throttle valve according to claim 1 is characterized in that: the valve stem nut is modified from the large bevel gear shaft in the manual bevel gear driver; its upper end is a cylinder with a step, and its lower end is a spline column; the through hole in the center is processed into a cylindrical hole in the upper half and a threaded hole in the lower half.

8. The ultra-high pressure manual wedge throttle valve according to claim 1, characterized in that: The main body part of the indicating rod is a cylinder with the same diameter. A hexagonal blind hole is machined at its upper end, and the lower end is machined into a screw head with a reduced diameter. On the outer surface of the cylinder of the indicating rod, ten equally spaced horizontal position lines are engraved, and the text "φXX.Xmm" is correspondingly engraved above each horizontal position line. The numerical value in each group of text starts from "φ0.0mm", is arranged longitudinally from top to bottom, increases row by row, and the above-mentioned text is evenly distributed in three or four groups on the circumference of the indicating rod.

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