A high-performance ultra-high pressure manual flat valve with non-stick stem.

Abstract

A high-performance ultra-high pressure manual flat plate valve with a non-circular stem has a drive unit connected to its valve body via a valve cover, valve stem, and support assembly. A display unit is mounted above the valve stem and drive unit. The drive unit is a general-purpose manual bevel gear actuator, using an arc-shaped groove in the large bevel gear shaft to drive the valve stem to rotate. The gate and valve stem nut are two independent parts connected by a "⊥" shaped groove and connector. The valve stem uses a screw at its lower end to pass through the threaded through-hole of the valve stem nut and the cylindrical blind hole above the gate to drive the valve's opening and closing. The display unit, driven by the valve stem, uses a reverse-threaded indicator screw to drive the indicator post, moving it up and down relative to the top cover of the through-hole, visually indicating the valve's opening and closing status. It features easy operation, comprehensive display, reliable sealing, wear and corrosion resistance, and sand and clogging prevention, making it more suitable for operation under ultra-high pressure and harsh conditions.

Description

Technical Field

[0001] This invention relates to a "manual flat valve" used in petroleum machinery and other industries. Background Technology

[0002] Manual rising stem slab valves are a common type of large-diameter gate valve used in oil drilling and production equipment. Compared to another commonly used type of manual rising stem slab valve, which has valve covers at both ends of the valve body and a protruding tail stem, it has always had advantages such as small size, light weight, and low price. However, its shortcomings become apparent when applied to ultra-high pressure conditions: Firstly, in ultra-high pressure conditions, manual rising stem slab valves replace the trapezoidal thread of the valve stem with a ball screw drive, thereby significantly reducing operating resistance; while manual rising stem slab valves, because they do not have a protruding tail stem, have the valve stem subjected to force in one direction, and the ball screw pair has a low coefficient of friction and poor self-locking ability, thus making it unsuitable for use. Furthermore, the nut of the ball screw assembly has a large diameter and an internal ball circuit; however, in existing manual non-rising stem flat valves, the valve stem nut and gate are integrated, with internal threads machined within the flat gate body. Therefore, it is difficult to machine the ball circuit of the ball screw assembly. If a ball circuit were to be designed and machined, the gate thickness would need to be significantly increased, leading to a substantial increase in the volume and size of components such as the valve body and valve cover, which is unacceptable. Secondly, in existing manual non-rising stem flat valves, the valve stem nut and gate are the same part. Under the action of ultra-high pressure sand-containing media, the gate will experience uneven wear and misalignment, thus causing twisting of the valve stem with varying axiality. This increases the frictional resistance of the trapezoidal thread assembly, making the valve opening and closing more difficult. Third, existing manual non-rising stem flat valves do not allow the moving stem and tail stem to be visible outside the valve body, making it impossible for operators to directly observe the valve's opening and closing status. If an operation error occurs, the valve will quickly wear out and become unusable under the impact of ultra-high pressure sand-containing media. A few specially designed manual non-rising stem flat valves, although equipped with on / off indicators, are confined below the handwheel, and their small size further complicates observation. Fourth, the sealing technology and related components of existing manual non-rising stem flat valves are ill-suited to the requirements of ultra-high pressure conditions; corresponding improvements are needed to achieve this. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems by employing multiple technical measures to innovatively design a manual flat valve with a non-stick stem, thereby resolving a series of issues such as difficulty in operation and observation under ultra-high pressure conditions, as well as short service life, and providing customers with more product options.

[0004] This invention comprises a valve body assembly, a valve cover assembly, a valve stem assembly, a support assembly, a drive assembly, a display assembly, a valve seat assembly, a valve stem nut, a gate, a sand guard plate, and matching seals and connectors. Its key features are: the drive assembly is connected to the valve body assembly via the valve cover assembly, valve stem assembly, and support assembly; the display assembly is mounted above the valve stem assembly and the drive assembly; the drive assembly is a general-purpose manual bevel gear actuator, using a circular arc head slot within a large bevel gear shaft to drive the valve stem assembly in rotational motion; the valve stem nut and the gate are two independent parts connected by a "⊥" shaped connector and a groove; the valve stem assembly uses its lower end screw to pass through the threaded through-hole of the valve stem nut and the cylindrical blind hole above the gate to drive the valve's opening and closing; the display assembly, driven by the valve stem assembly, uses a reverse-threaded indicator screw to drive the indicator post to move up and down relative to the through-hole 2 cover, visually displaying the valve's opening and closing status.

[0005] In addition, the non-metallic materials of the sealing components in the valve cover assembly and the inner and outer sealing rings in the valve seat assembly are all made of engineering plastics molded from "polyether ether ketone, code: PEEK" or "polytetrafluoroethylene, code: PTFE".

[0006] Because the driving component of this invention uses a manual bevel gear actuator, the lever effect of its transmission ratio can significantly reduce the operating resistance of the valve. Furthermore, since the gate and valve stem nut are independent, there can be a slight relative displacement at their connection point, thus eliminating the misalignment and twisting phenomenon between the valve stem nut and the valve stem. This allows for easy operation of the manual non-stick flat valve even under ultra-high pressure conditions. The valve's on / off indicator is mounted above the valve stem assembly and the manual bevel gear actuator, without any obstruction, allowing for easy observation of the valve's on / off status from multiple angles, reducing misjudgment losses. The combined seal in the valve cover assembly and the inner and outer sealing rings in the valve seat assembly are made of engineering plastics molded from "polyetheretherketone (PEEK)" or "polytetrafluoroethylene (PTFE)". Compared to previous rubber seals, these not only have lower frictional resistance but also significantly improved pressure resistance and corrosion resistance. This makes this invention more suitable for operation under ultra-high pressure conditions containing sand and sulfur. Attached Figure Description

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

[0008] Figure 2 For the present invention Figure 1 In the middle, a partial enlarged cross-sectional view of the sealing assembly inside the valve cover;

[0009] Figure 3 For the present invention Figure 1 In the middle, an enlarged schematic diagram of the marking lines and text on the outer surface of the A-direction indicator post;

[0010] Figure 4 For the present invention Figure 1 A partially enlarged schematic diagram of the cross-section at point B of the inner and outer sealing rings of the valve seat;

[0011] Figure 5 For the present invention Figure 1 In the middle, a half-section enlarged schematic diagram of the joint between the valve stem nut and the gate in direction C.

[0012] The component names shown in the diagram are as follows:

[0013] 1. Valve body, 2. Valve cover, 3. Valve stem, 4. Bracket, 5. Manual bevel gear actuator, 6. Through-hole top cover, 7. Indicator screw, 8. Indicator post, 9. Dust cover, 10. O-ring, 11. Cylindrical end screw, 12. Sealing gasket, 13. Cylindrical pin, 14. Drive rod, 15. O-ring, 16. Thrust bearing, 17. Cylindrical pin, 18. Connecting bolt, 19. Oil cup, 20. Set screw, 21. Sealing assembly, 22. Stud nut, 23. Sealing washer ring, 24. Valve stem nut, 25. Gate, 26. Valve seat, 27. Sandproof plate, 28. Grease injection valve, 29. Inner sealing ring, 30. Outer sealing ring. Detailed Implementation

[0014] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0015] Figure 1 This invention comprises a valve body component, a valve cover component, a valve stem component, a bracket component, a drive component, a display component, a valve seat component, a valve stem nut 24, a gate 25, a sand guard 27, and matching seals and connectors. In the drive component, a manual bevel gear actuator 5 replaces the conventional handwheel; a valve switch display component is installed above the valve stem component and the manual bevel gear actuator 5; the valve stem nut 24 and the gate 25, which are the same part, are divided into two independent parts and then connected together using a "⊥" shaped connector and a groove; the sealing assembly 21 in the valve cover component and the inner sealing ring 29 and outer sealing ring 30 in the valve seat component are changed from conventional rubber products to high-performance plastic products; these are several key technical measures that provide excellent performance under ultra-high pressure conditions.

[0016] The valve body component of this invention consists of a valve body 1 and a grease injection valve 28. The valve body 1 is a three-way component with a central column. The center of the column is machined into a cylindrical blind-hole valve cavity for mounting the valve stem 3, valve stem nut 24, gate 25, sand guard 27, and valve seat component. The upper end face of the column is machined with trapezoidal gasket grooves concentric with the blind-hole valve cavity and evenly distributed threaded blind holes for connecting the valve cover 2. The left and right sides of the valve body 1 have protruding necked flanges, the center of which has a channel hole perpendicularly penetrating the blind-hole valve cavity. On the end faces of the necked flanges on both sides, trapezoidal gasket grooves concentric with the channel hole and evenly distributed bolt holes are machined for external connection. A radial stepped hole with tapered threads at the inlet is drilled at the lower edge of the valve body 1, and the grease injection valve 28 is installed in the hole.

[0017] The valve cover component of the present invention consists of a valve cover 2, a sealing assembly 21, and a grease injection valve 28. The valve cover 2 is a "⊥" shaped part. The upper end has a small-diameter stud and a cylinder for connecting the support component. The lower end is a larger-diameter cylindrical flange with a trapezoidal gasket groove concentric with the central hole and evenly distributed stud holes on its lower end face. It is connected and sealed to the valve body 1 by stud nuts 22 and sealing gaskets 23. The center of the valve cover 2 is a through hole that is thick at both ends and thin in the middle. The upper end has a larger-diameter threaded hole and a cylindrical hole for installing the sealing assembly 21. The lower end has a large cylindrical hole with the same diameter as the valve cavity and a larger-diameter cylindrical hole, providing space for the valve stem 3, valve stem nut 24 and gate 25 to move. The valve stem 3 passes through the smaller-diameter cylindrical hole in the middle. On the side wall of the valve cover 2 body, there is a radial stepped hole with a tapered thread at the inlet, and a grease injection valve 28 is installed in the hole. The grease injection valve 28 is a general-purpose part that fits with the grease injection valve 28 on the bottom of the valve body 1 to inject sealing grease into the blind hole valve cavity.

[0018] Figure 1 and Figure 2 In the valve cover assembly, the sealing component 21 is composed of a metal cap, a sealing ring with a square V-groove cross section, a sealing ring with a symmetrical wing-shaped cross section, a composite sealing ring with a bell-shaped cross section, and a retaining ring with a ⊥-shaped cross section, stacked from top to bottom. The three sealing rings and the retaining ring are all molded from engineering plastics such as "polyetheretherketone (PEEK)" or "polytetrafluoroethylene (PTFE)". In the inner cavity of the composite sealing ring with a bell-shaped cross section, there is also a ring-shaped metal spring ring with a top bent into an arc and a V-shaped cross section to prevent the excessive pressure in the valve cavity from leaking from the valve stem 3.

[0019] The valve stem component of this invention comprises a valve stem 3, a drive rod 14, an O-ring seal 15, a thrust bearing 16, and a cylindrical pin 17, and runs through the valve body component, valve cover component, bracket component, drive component, valve stem nut 24, and gate 25. The upper half of the valve stem 3 is a smooth cylinder to facilitate sealing with the sealing assembly 21; a radial pin hole is machined at the upper end, which is connected to the lower end of the drive rod 14 by the cylindrical pin 17; the lower half is machined into a screw to cooperate with the valve stem nut 24, so as to convert the rotational torque into an up-and-down pushing and pulling force. In the middle of the valve stem 3, there is a shoulder with a conical surface, the diameter of which is larger than the smallest diameter hole in the center of the valve cover 2. When the conical shoulder contacts the smallest diameter hole, a reverse seal can be formed to facilitate the replacement of damaged sealing assembly 21 or other parts under pressure. The upper half of the drive rod 14 is a flat cylinder symmetrically machined into two planes, which mates with the arc-shaped head slot at the center of the large bevel gear shaft in the manual bevel gear drive 5 to transmit torque. Its upper end is machined with a central blind hole and a radial pin hole for connecting the display component. The lower half of the drive rod 14 consists of a cylinder with progressively thicker diameter sections and a raised shoulder. A groove is machined on the first thickened section of the cylinder, in which an O-ring seal 15 is installed. Thrust bearings 16 are mounted above and below the raised shoulder for positioning and supporting the valve stem component. Its lower end also has a central blind hole and a radial pin hole, through which a cylindrical pin 17 connects the valve stem 3 and the drive rod 14.

[0020] The bracket component of this invention consists of a bracket 4, an oil cup 19, and a set screw 20. The bracket 4 is a "T"-shaped part: a stepped hole runs through the center from bottom to top; the lower end of the stepped hole is a threaded hole with the largest diameter, used to connect to the upper end of the valve cover 2; the middle part is a cylindrical hole with a larger diameter, used to install the protruding shoulder of the drive rod 14 and the thrust bearing 16; the upper end is a cylindrical hole with a smaller diameter, used to accommodate the thickened cylinder of the first section of the drive rod 14 and the O-ring seal 15. The upper end of the bracket 4 is a large-diameter flange, which is connected to the manual bevel gear drive 5 via evenly distributed bolt holes using connecting bolts 18; the lower end is a hollow cylinder with a reduced diameter, and a radial threaded hole is drilled above the hollow cylinder, in which an oil cup 19 is installed; two radial threaded holes are symmetrically drilled at the lower edge, each containing a set screw 20 to prevent deflection between the bracket 4 and the valve cover 2.

[0021] The driving component of this invention uses a universal manual bevel gear drive 5, which consists of a handwheel, a pair of bevel gears, a large bevel gear shaft, bearings, end caps, a housing, a bottom cover plate, and matching seals and connectors. The large bevel gear shaft has a through stepped hole at its center. Above the stepped hole is a cylindrical hole with a larger diameter for mounting the display component; below is a slightly smaller arc-shaped slot for connecting the upper end of the drive rod 14. A positioning bearing is mounted at the upper end of the large bevel gear shaft, and the lower end is connected to the central hole of the large bevel gear by a spline. The bottom cover plate of the manual bevel gear drive 5 has evenly distributed threaded holes for connection and fixation with the bracket 4. A threaded hole with a larger diameter is opened at the top of the housing for attaching a top cover, or for mounting the display component or other parts.

[0022] Figure 1 and Figure 3 In this invention, the display component comprises a through-hole top cover 6, an indicator screw 7, an indicator post 8, a dust cover 9, an O-ring seal 10, a cylindrical end screw 11, a sealing gasket 12, and a cylindrical pin 13. The through-hole top cover 6 can be improved from the original top cover of the manual bevel gear drive 5: its central blind hole is machined into a through hole, and a groove is cut in the through hole to install the O-ring seal 10; a radial threaded hole communicating with the central hole is drilled on the exposed circumference of the top cover, and a cylindrical end screw 11 is installed inside. The majority of the indicator screw 7 is machined into a screw of the same diameter, with the screw direction opposite to that of the lower half of the valve stem 3, to drive the indicator post 8; a small portion at the lower end of the indicator screw 7 is machined into a cylinder and drilled with a radial pin hole for connection with the upper end of the drive rod 14 using the cylindrical pin 13. The indicator post 8 is a hollow cylindrical part with the same outer diameter. Its center has a through hole with a reverse internal thread at the bottom, which moves up and down under the drive of the indicator screw 7. An axial groove is cut on the outer surface of the cylinder to prevent torsion after it is engaged with the cylinder end screw 11. On the outer surface of the cylinder, five equally spaced horizontal position lines are also engraved. Above the position lines are the words "fully closed, 25%, 50%, 75% and fully open". After it is engaged with the upper end plane of the through hole top cover 6, it indicates the position of the gate channel hole. A plastic dust cover 9 is inserted at the upper hole of the indicator post 8. A small vent hole is drilled in the center of the dust cover 9.

[0023] Figure 1 and Figure 4In this invention, the valve seat component comprises a valve seat 26, an inner sealing ring 29, and an outer sealing ring 30, symmetrically installed between the inner side of the left and right passage holes of the valve body 1 and the gate plate 25. The valve seat 26 is a tubular short section with a groove for disassembly and assembly cut in the middle of its outer circumference. A tungsten carbide hard alloy layer is coated on the sealing surface at its inner end, and two annular sealing grooves of different diameters are cut on its outer end face. The inner sealing ring 29 and the outer sealing ring 30 are respectively installed in the sealing grooves for contact and sealing with the valve body 1. Both the inner sealing ring 29 and the outer sealing ring 30 in the valve seat assembly are composite elastic sealing rings: the radial cross-section of the outer main ring is U-shaped, and it is molded from engineering plastics such as "polyetheretherketone (PEEK)" or "polytetrafluoroethylene (PTFE)". Inside the U-shaped opening of the main ring, there is a metal spring ring with a radial cross-section of V-shape; inside the V-shaped opening of the metal spring ring, there is an elastic plastic ring with a radial cross-section of rectangle and chamfered edges. The differences between the inner sealing ring 29 and the outer sealing ring 30 are: firstly, their diameters are different; secondly, the U-shaped main ring opening of the inner sealing ring 29 faces inward, while the U-shaped main ring opening of the outer sealing ring 30 faces outward.

[0024] Figure 1 and Figure 5 In this invention, the valve stem nut 24 is a columnar part independent of the gate plate 25; its upper part is a cylinder that enters and exits the lower end of the valve cover 2 through a cylindrical hole with a relatively large diameter, and its lower part is a "⊥"-shaped connector that connects with the "⊥"-shaped groove at the upper end of the gate plate 25. The bottom plate of the "⊥"-shaped connector is square to increase the anti-torsion contact area; its center is a threaded through hole that mates with the lower half of the valve stem 3 screw, thereby generating the force to drive the gate plate 25.

[0025] The gate plate 25 of this invention is a rectangular steel plate with chamfered edges. A "⊥" shaped groove is machined at the upper end of the steel plate for connecting the valve stem nut 24. A cylindrical blind hole is drilled below the "⊥" shaped groove, and a vent hole perpendicularly intersecting the blind hole is drilled at the lower end of the blind hole, serving as the movement space for the valve stem 3 and thereby shortening the axial dimensions of the valve cover 2 and the valve stem 3. Tungsten carbide hard alloy layers are coated on both sealing surfaces of the steel plate, and cylindrical channel holes are opened below the sealing surfaces. After fitting with the inner surfaces of the left and right valve seats 26 and the lower sandproof plate 27, bidirectional metal sealing of the valve can be achieved, and sandproof function is provided. The two sandproof plates 27 below the valve seat 26 are symmetrically distributed. In addition to preventing sand-containing media in the channel hole of the gate plate 25 from entering the valve cavity, their upper arc concave surfaces also provide auxiliary support for the valve seat 26.

Claims

1. A high-performance ultra-high pressure manual flat valve with a non-sunken stem, comprising a valve body assembly, valve cover assembly, valve stem assembly, bracket assembly, drive assembly, display assembly, valve seat assembly, valve stem nut, gate, sandproof plate parts, and matching seals and connecting parts; characterized in that: Above the valve body assembly, the drive assembly is connected via the valve cover assembly, valve stem assembly, and bracket assembly. Above the valve stem assembly and drive assembly, a display assembly is mounted. The drive assembly is a general-purpose manual bevel gear actuator, which uses the arc-shaped head slot in the large bevel gear shaft to drive the valve stem assembly to rotate. The valve stem nut and gate are two independent parts, connected together by a "⊥" shaped connector and groove. The valve stem assembly uses its lower end screw to pass through the threaded through hole of the valve stem nut and the cylindrical blind hole above the gate to drive the valve to open and close. Driven by the valve stem assembly, the display assembly uses an indicator screw with a reverse thread to drive the indicator post to move up and down relative to the top cover of the through hole, visually displaying the valve's open and closed status. The gate is a rectangular steel plate with chamfered edges. A "⊥" shaped groove is machined on the upper end of the steel plate. A cylindrical blind hole is drilled below the "⊥" shaped groove. A vent hole perpendicular to the blind hole is drilled at the lower end of the blind hole. Tungsten carbide hard alloy layer is coated on the sealing surfaces on both sides of the steel plate. A cylindrical channel hole is opened below the sealing surface. Both the inner and outer sealing rings in the valve seat assembly are composite elastic sealing rings: the radial cross-section of the outer main ring is U-shaped, molded from polyetheretherketone (PEEK) engineering plastic; inside the U-shaped opening of the main ring is a metal spring ring with a V-shaped radial cross-section; inside the V-shaped opening of the metal spring ring is an elastic plastic ring with a rectangular radial cross-section and chamfered edges; the differences between the inner and outer sealing rings are: firstly, their diameters are different; secondly, the U-shaped main ring opening of the inner sealing ring faces inward, while the U-shaped main ring opening of the outer sealing ring faces outward. The valve seat is symmetrically equipped with sand-proof plates at the bottom. When closed, the inner sides of the two symmetrically arranged sand-proof plates fit against the gate, preventing sand-containing media in the gate channel hole from entering the valve cavity. At the same time, the arc concave surface at the upper end of the sand-proof plates assists in supporting the valve seat.

2. The ultra-high pressure manual flat valve with a non-stick stem according to claim 1, characterized in that: The sealing assembly in the valve cover component consists of, from top to bottom, a pressure cap, a sealing ring with a square V-groove cross section, a sealing ring with a symmetrical wing-shaped cross section, a composite sealing ring with a bell-shaped cross section, and a retaining ring with a ⊥-shaped cross section. All three sealing rings and the retaining ring are molded from engineering plastic "polyetheretherketone (code: PEEK)". Inside the cavity of the composite sealing ring with a bell-shaped cross section, there is also a ring-shaped metal spring ring with a top bent into an arc and a V-shaped cross section.

3. The ultra-high pressure manual flat valve with a non-stick stem according to claim 1, characterized in that: The display component consists of a through-hole top cover, an indicator screw, an indicator post, a dust cover, an O-ring, a cylindrical end screw, a sealing gasket, and a cylindrical pin. The indicator post is a hollow cylindrical part with the same outer diameter. Its center is a through hole with a section of reverse internal thread at the bottom. An axial groove is cut on the outer surface of the cylinder. On the outer surface of the cylinder, five equally spaced horizontal position lines are engraved. Above the position lines are the words "fully closed, 25%, 50%, 75%, and fully open".

4. The ultra-high pressure manual flat valve with concealed stem as described in claim 1, Its characteristic is that the valve stem nut is a columnar part independent of the gate; Above it is a cylinder with a relatively large diameter cylindrical hole at the lower end of the valve cover, and below it is a "⊥" shaped connector that connects with the "⊥" shaped groove at the upper end of the gate plate. The bottom plate of the "⊥" shaped connector is square. Its center is a threaded through hole that mates with the lower half of the valve stem screw.

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