Ultrahigh-pressure straight-through plate-type manual throttle valve

Abstract

The invention discloses an ultrahigh-pressure straight-through type plate-type manual throttle valve, and relates to the technical field of valves, a flashboard throttling assembly is arranged in a valve cavity of a valve body, the valve body and a valve cover are connected through a sealing backing ring and uniformly distributed studs and nuts, a supporting flange and a gear driving assembly are fixed above the valve cover through threads and set screws, and the gear driving assembly is connected with the flashboard throttling assembly. The valve rod indicating assembly penetrates through the center of the valve cover, the center of the bearing flange and the center of the gear driving assembly and is connected with the flashboard throttling assembly in the valve cavity, the gear driving assembly drives the valve rod indicating assembly and the flashboard embedded with the valve element to move up and down, and the flow is adjusted according to the number of throttling holes in the middle of the valve element covered by valve seat channel holes fixed to the two sides. The valve element and the valve seat are both made of hard alloy materials, the hard alloy abrasion-resistant layer is arranged in the outlet channel of the valve body in a surfacing mode, and the novel throttling valve is resistant to high pressure, small in resistance, accurate in metering, long in service life and easy to produce.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, in particular to an ultra-high pressure straight-through plate-type manual throttle valve. Background Art

[0002] Currently, the majority of throttle valves used in petrochemical machinery and equipment are of the right-angle turn type. This means that the fluid makes a right-angle turn as it passes through the valve's throttling assembly, thus meeting the throttling and steering requirements of many equipment. The few straight-through throttle valves currently in use appear to be a straight line with flanged ends, but internally they employ a zigzag flow path and a right-angle turn throttling assembly, essentially remaining unchanged. Throttle valves with right-angle turns or zigzag flow paths, when subjected to ultra-high-pressure, sand-laden fluids exceeding 100 MPa, suffer from issues such as easy valve body penetration, rapid wear of the valve core and seat, high flow resistance, high energy consumption, and inaccurate metering. In addition, the petrochemical machinery industry has long held the consensus that "straight-through flat gate valves cannot be used as throttling valves." This consensus stems from two main reasons: first, during the throttling process, a deep groove forms between the gate hole and the valve seat hole, which in turn stimulates the impact and destructive force of the sand-laden fluid, causing rapid wear of the gate and valve seat; second, both the gate and valve seat are made of medium- and low-carbon alloy steel with a tungsten carbide coating on the surface, which lacks long-lasting wear resistance. Once the sealing performance of the flat gate valve and valve seat is damaged, they lose their functionality, resulting in significant economic losses. Therefore, this consensus, formed based on objective facts, has had a somewhat negative impact on the subsequent design of straight-through throttling valves.

[0003] However, the petrochemical machinery industry is in urgent need of straight-through throttle valves. Therefore, it is imperative to design a straight-through throttle valve that offers a high standardization coefficient, ease of mass production, resistance to valve body breakdown, long valve core and seat life, low flow resistance, low energy consumption, and more accurate metering. However, throttle valves operating at pressures of 140MPa to 175MPa are currently the most difficult to manufacture and suffer the most quality issues, presenting a pressing technical challenge for those skilled in the art. Summary of the Invention

[0004] The purpose of the present invention is to provide an ultra-high pressure straight-through plate-type manual throttle valve that can adapt to the working conditions of 140MPa to 175MPa and solve the problems listed in the background technology.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides an ultra-high pressure straight-through plate-type manual throttle valve, which is composed of a valve body, a gate throttling assembly, a valve cover, a supporting flange, a gear drive assembly, a valve stem indicator assembly and matching seals and threaded connectors. The valve is characterized in that the overall structural design of an ultra-high pressure tailless rising stem flat plate valve is adopted as the whole, the gate throttling assembly is installed in the valve cavity of the valve body, the valve body and the valve cover are connected by a sealing gasket and evenly distributed stud nuts, the supporting flange is fixed to the top of the valve cover by threads and set screws, the supporting flange is connected to the gear drive assembly by a hexagonal bolt, the valve stem indicator assembly passes through the center of the valve cover, the supporting flange and the gear drive assembly, the valve stem indicator assembly is connected to the gate throttling assembly, and the gear drive assembly drives the valve stem indicator assembly and the gate embedded in the valve core to move up and down.

[0007] Preferably, a hard alloy wear-resistant layer is built-up on the hole wall of the valve body outlet channel.

[0008] Preferably, the gate throttling assembly includes a gate, a valve core, a valve seat, a sand control plate and a guide strip. The gate abuts against the valve seats on both sides, and the guide strips are installed in the grooves on the front and rear sides of the gate. Both ends of the valve seat are connected to the valve body, and an inner sealing ring and an outer sealing ring are installed in sequence from the inside to the outside between the opposing surfaces of the valve seat and the valve body.

[0009] A sand-proof plate is installed between the valve seat and the valve body, and the inner side of the sand-proof plate contacts the side surface of the gate plate;

[0010] The valve core is embedded in the channel hole of the gate plate.

[0011] Preferably, the valve core and the valve seat are both made of hard alloy material.

[0012] Preferably, the middle of the valve core is densely covered with throttle holes, and the throttle holes are located in the channel aperture formed by the valve body and the valve seat, and are symmetrically distributed relative to the perpendicular bisector of the channel aperture;

[0013] Except for the center line of the top row of throttling holes being a straight line, the center lines of the other throttling holes are all arc lines of the same radius, and the centers of the arc lines are all located on the perpendicular bisector of the channel aperture.

[0014] Preferably, the throttle holes are divided into small throttle holes and large throttle holes, the small throttle holes are distributed on both side edges of the spool where the throttle holes are densely distributed, and the large throttle holes are located in the middle of the spool where the throttle holes are densely distributed;

[0015] The small throttling hole and the large throttling hole both have safety boundaries with the same wall thickness, wherein the safety boundaries of the large throttling hole are only tangent but not intersecting.

[0016] Preferably, the valve stem indicator assembly includes a valve stem, an indicator rod and a spring washer, the trapezoidal threaded rod in the valve stem is connected to the valve stem nut in the gear drive assembly, and the valve stem nut is installed in the spline hole in the center of the large bevel gear in the gear drive assembly;

[0017] The indicator rod is installed on the upper end of the valve stem, and a spring washer is installed at the connection between the indicator rod and the valve stem.

[0018] Preferably, a through-hole cover is installed on the gear drive assembly, an O-ring is installed on the inner ring of the through-hole cover, and the O-ring abuts against the outer peripheral surface of the indicator rod;

[0019] The outer circumference of the indicator rod is engraved with ten equally spaced horizontal circular scale lines, and above each of the horizontal circular scale lines are four groups of values ​​of the same equivalent aperture;

[0020] The sum of the distances of the ten equally spaced horizontal circumferential scale lines is the same as the diameter of the passage holes of the valve body and the valve seat;

[0021] The values ​​of the equivalent aperture above each horizontal surrounding scale line start from "φ0.00" from top to bottom to the maximum value.

[0022] Preferably, a sealing assembly is installed in the central hole above the valve cover, and the sealing assembly abuts against the outer peripheral surface of the valve stem;

[0023] A through hole is provided on the side wall of the valve cover, and a grease injection valve is sealed and installed in the through hole.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] The present invention provides an ultra-high-pressure straight-through plate-type manual throttle valve, in which a hard alloy valve core is embedded in the original channel hole of the gate plate, and a unique throttle hole distribution design is added, which completely avoids the previous problems of deep groove formation and accelerated wear between the gate plate hole and the valve seat hole; in addition, the valve seat is also made entirely of hard alloy material, and a hard alloy wear-resistant layer is welded on the hole wall of the outlet channel of the valve body, so that it has long-lasting wear resistance; the slender throttle holes with a clear number and the same thickness as the gate plate in the valve core will not be easily worn or deformed, and the flow stability and metering accuracy can be maintained for a long time; in addition, the trapezoidal thread self-locking function and the display of the adjustment status in the gear drive assembly and the valve stem indicator assembly can be used to easily and accurately adjust the flow. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings.

[0027] Figure 1This is a cross-sectional schematic diagram of an ultra-high pressure straight-through plate-type manual throttle valve of the present invention;

[0028] Figure 2 It is a partial cross-sectional schematic diagram of the position AA below the valve body of the present invention;

[0029] Figure 3 This is an enlarged schematic diagram of the valve core in the gate throttling assembly of the present invention in the B direction;

[0030] Figure 4 This is an enlarged schematic diagram of the cross section of the inner sealing ring in the gate throttling assembly of the present invention;

[0031] Figure 5 This is an enlarged schematic diagram of the removed section of the sealing component in the valve cover of the present invention.

[0032] Explanation of the accompanying reference numerals: 1. Valve body; 2. Sealing gasket; 3. Valve cover; 4. Stud nut; 5. Support flange; 6. Hexagonal bolt; 7. Gear drive assembly; 8. Valve stem; 9. Through-hole top cover; 10. Indicator rod; 11. Spring washer; 12. O-ring; 13. Stem nut; 14. Sealing assembly; 15. Set screw; 16. Grease injection valve; 17. Gate; 18. Valve core; 18-1. Small throttle hole; 18-2. Large throttle hole; 18-3. Safety limit; 19. Valve seat; 20. Inner sealing ring; 21. Outer sealing ring; 22. Sand control plate; 23. Guide strip; 24. Wear-resistant layer. DETAILED DESCRIPTION

[0033] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0034] like Figure 1-5 As shown, an ultra-high-pressure straight-through plate-type manual throttle valve is composed of a valve body 1, a gate throttling assembly, a valve cover, a support flange 5, a gear drive assembly 7, a valve stem indicator assembly, and matching seals and threaded connectors. The valve body 1 is used as a carrier, and a modified gate throttling assembly is installed in the valve cavity of the valve body 1. The valve body 1 is connected to the valve cover 3 above with a sealing ring 2 and evenly distributed stud nuts 4; the support flange 5 and the gear drive assembly 7 are fixed above the valve cover 3 by threads and set screws 15.

[0035] The valve stem indicator assembly passes through the center of the valve cover 3, the supporting flange 5 and the gear drive assembly 7. The valve stem indicator assembly is connected to the gate throttling assembly in the valve cavity. The gear drive assembly 7 drives the valve stem indicator assembly and the gate 17 inlaid with the valve core 18 to move up and down, and the channel holes of the valve seats 19 fixed on both sides cover the number of throttling holes in the middle of the valve core 18 to adjust the flow rate.

[0036] Specifically, the middle of the valve body 1 is a columnar body with a cylindrical blind hole valve cavity, and the left and right ends are extended with neck flanges. The center of the neck flange is processed with left and right channel holes that intersect with the valve cavity hole at right angles. The intersection of the left and right channel holes and the valve cavity hole is expanded with a mounting hole for the valve seat 19; the end faces of the left and right neck flanges are processed with a trapezoidal gasket groove and evenly distributed stud holes for external connection; the upper surface of the middle columnar body of the valve body 1 is processed with a trapezoidal gasket groove and evenly distributed threaded blind holes for connecting the valve cover;

[0037] As the valve body of the throttle valve, a hard alloy wear-resistant layer 24 is built-up on the entire wall of the outlet channel of the valve body 1 to extend its service life.

[0038] Specifically, the gate throttling assembly consists of a gate 17, a valve core 18, valve seats 19 on both sides, an inner sealing ring 20, an outer sealing ring 21, a sand control plate 22 and guide strips 23 on the front and rear sides. It is symmetrically installed in the valve cavity of the valve body 1 from top to bottom. The gate 17 is a rectangular parallel gate. Its upper end is connected to the "I"-shaped joint at the lower end of the valve stem 8 with a "⊥"-shaped groove. Valve seats 19 are installed on the left and right sides. The contact point between the valve seat 19 and the valve body 1 is equipped with an inner sealing ring 20 and an outer sealing ring 21. A sand control plate 22 is installed below the valve seat 19. The front and rear sides of the gate 17 are limited by a through long groove and a guide strip 23.

[0039] The valve core 18 is made of cemented carbide and has a step on its circumference. It is densely packed with throttle holes in the middle and is embedded in the original passage hole of the gate 17. It is ground flat together with the tungsten carbide sealing surfaces sprayed on both sides of the gate 17.

[0040] Furthermore, the gate throttling assembly can be replaced after being worn, thereby significantly extending the service life of the throttle valve and generating better use benefits.

[0041] like Figure 3 As shown, the throttle holes densely distributed in the center of the valve core 18 are located within the channel aperture formed by the valve body 1 and the valve seat 19, and are symmetrically distributed relative to the perpendicular bisector of the channel aperture. Except for the center line of the top row of throttle holes, which is a straight line, the center lines of the remaining nine rows of throttle holes are all circular arcs of the same radius, and the centers of the circular arcs are all located on the perpendicular bisector of the channel aperture. The throttle holes densely distributed in the center of the valve core 18 are divided into small throttle holes 18-1 and large throttle holes 18-2. The small throttle holes 18-1 with smaller apertures are located on the edges of the valve core 18, and the large throttle holes 18-2 with larger apertures are sandwiched by the small throttle holes 18-1 on the edges of the valve core 18. The small throttle holes 18-1 and the large throttle holes 18-2 both have safety boundaries 18-3 with the same wall thickness. The safety boundary 18-3 of the large throttle hole 18-2 is tangential and does not intersect, so as to ensure unobstructed flow of the throttle holes during flow adjustment and have a wall thickness that is durable and wear-resistant.

[0042] Specifically, the valve seat 19 is a tubular short section part with a groove for disassembly and assembly processed on its inner and outer circumferences. The inner end is a metal sealing surface, and the outer end surface is processed with two annular sealing grooves of different diameters. The annular sealing grooves are respectively equipped with an inner sealing ring 20 and an outer sealing ring 21; the valve seat 19, as the core part of the throttle valve, is made entirely of cemented carbide material to ensure a long service life.

[0043] like Figure 4 As shown, the inner sealing ring 20 and the outer sealing ring 21 matching the valve seat 19 are both elastic sealing rings composited with two materials, the outer layer of which is a plastic ring with a bud-shaped radial cross-section, which is molded with "PEEK polyetheretherketone" special engineering plastic; the opening of the bud-shaped ring contains a metal spring ring with an O-shaped radial cross-section, and the metal spring ring is wound with "Elgiloy" non-magnetic alloy steel wire; the difference between the inner sealing ring 20 and the outer sealing ring 21 is: first, the diameter of the inner sealing ring 20 is small, and the diameter of the outer sealing ring 21 is large; second, the bud-shaped ring of the inner sealing ring 20 opens inward, and the bud-shaped ring of the outer sealing ring 21 opens outward, so that the opening is opened and sealed under the action of the pressure medium.

[0044] Specifically, the sand-proof plate 22 is a rectangular steel plate with smooth planes on the left and right sides, and a small pressure-balancing hole drilled below the centerline of the plane; there is an arc-shaped notch on the top that connects with the valve seat 19, and the bottom contacts the bottom of the valve cavity. The front and back sides are arc edges that fit the cylindrical valve cavity, and the intersection of the two arc edges and the bottom is a large chamfer to facilitate installation in the valve cavity; there are two sand-proof plates 22 and they are used opposite to each other, clamped on both sides of the gate plate 17 and the valve core 18 to prevent impurities such as sand particles from entering the valve cavity.

[0045] Specifically, the guide strip 23 is a strip-shaped part punched from a thin steel plate, has an arcuate cross section, and is elastic. The guide strip 23 is inserted at the front and rear sides of the gate plate 17 to prevent the gate plate from deflecting.

[0046] The upper end of the valve cover 3 is a hollow stud body with a smaller diameter and a back cutter groove, which is used to connect the supporting flange; the lower end is a hollow cylinder with a larger diameter, and the bottom of the hollow cylinder is processed with a trapezoidal gasket groove and evenly distributed stud holes for connecting to the valve body 1; the center of the valve cover 3 is a threaded hole and a cylindrical hole of different diameters, and the upper end face downwards are a threaded hole with a smaller diameter and a cylindrical step hole, which are used to install the combined seal 14; the lower end face upwards is a large cylindrical hole with the same diameter as the valve cavity and a shallower depth, which is used as an extension of the valve cavity; on the side wall of the hollow cylinder at the lower end of the valve cover 3, a stepped hole with a tapered thread at the inlet is drilled, and a grease injection valve 16 is installed in the hole for injecting sealing grease into the valve to improve the sealing performance of the valve or to discharge residual pressure in the valve cavity during maintenance.

[0047] like Figure 4 As shown, the sealing assembly 14 is composed of a packing gland, two layers of metal washers, four layers of sealing rings with different cross sections and a layer of ⊥-shaped retaining ring stacked together; under the packing gland, two layers of metal washers are placed on the upper and lower surfaces of the four layers of sealing rings with different cross sections and the layer of ⊥-shaped retaining ring respectively; the four layers of sealing rings with different cross sections, the top layer is a square V-groove sealing ring with a cross section, the second layer is a symmetrical wing-shaped sealing ring with a cross section, the third layer is a short-handled bell-shaped composite sealing ring with a cross section; the fourth layer is a long-handled bell-shaped composite sealing ring with a cross section; when the four layers of sealing rings are stacked: the V-groove below the top square V-groove sealing ring coincides with the tip above the second layer of symmetrical wing-shaped sealing ring, the grooved V-groove below the second layer of symmetrical wing-shaped sealing ring coincides with the tip and short handle above the third layer of short-handled bell-shaped composite sealing ring, the fourth layer of long-handled bell-shaped composite sealing ring coincides with the tip and short handle above the third layer of short-handled bell-shaped composite sealing ring, and the fourth layer of long-handled bell-shaped composite sealing ring coincides with the tip and short handle above the third layer of short-handled bell-shaped composite sealing ring. The long handle of the ring is inserted into the inner cavity below the third layer of short-handled bell-shaped composite sealing ring, and the long handle of the ⊥-shaped retaining ring is inserted into the inner cavity below the outer fourth layer of long-handled bell-shaped composite sealing ring. Under the pressure from the medium below, multiple seals can be formed on the upper valve cover 3 and the valve stem 8; in addition, in order to cope with ultra-high pressure working conditions, the square V-groove section sealing ring, the symmetrical wing-shaped section sealing ring and the ⊥-shaped retaining ring in the combined seal 19, as well as the shells of the short-handled bell-shaped section composite sealing ring and the long-handled bell-shaped section composite sealing ring, are all molded with "PEEK polyetheretherketone" special engineering plastic; in the inner cavity of the short-handled bell-shaped section composite sealing ring, an annular spring with the top bent into a circular arc and a V-shaped cross-section is installed; the annular springs are all stamped and welded with "Elgiloy" non-magnetic alloy thin steel plates.

[0048] Specifically, the supporting flange 5 is an upright neck flange, the bottom end of which is connected to the stud body at the upper end of the valve cover 3 by a threaded hole, and then fixed with two set screws 15; uniformly distributed bolt holes are processed on the upper end plane of the supporting flange 5, and the gear drive assembly 7 is fixed with hexagonal bolts 6.

[0049] Specifically, the gear drive assembly 7 adopts a universal manual bevel gear drive, which is composed of a handwheel, an end cover, a pair of large and small bevel gears, two pairs of large and small bearings, a housing, an oil cup, a through-hole top cover 9, an О-shaped sealing ring 12, a valve stem nut 13, a bottom cover plate and matching seals and threaded connectors. The holes in the center of the through-hole top cover 9, the О-shaped sealing ring 12 and the valve stem nut 13 must be processed in accordance with the design requirements of the present invention. The bottom cover plate of the gear drive assembly 7 is fixed to the housing and the supporting flange 5 with a hexagon socket screw and a hexagon bolt 6 respectively; a pair of large and small bevel gears, two pairs of large and small bearings are installed in the housing. And the valve stem nut 13; the threaded hole above the shell is equipped with a through-hole top cover 9 and an О-shaped sealing ring 12; the end cover and handwheel are installed at the protruding end of the shell; the valve stem nut 13 is also used as the large bevel gear shaft in the manual bevel gear driver, and its upper end is a cylinder with a step, which is connected to the thrust bearing in the shell; its lower end is a spline column, which is installed in the spline hole in the center of the large bevel gear; the through hole in the center is processed into a cylindrical hole in the upper half and a trapezoidal threaded hole in the lower half, which is connected to the trapezoidal threaded rod in the upper section of the valve stem 8, thereby converting the rotational motion of the bevel gear into the axial motion of the valve stem indicating assembly.

[0050] Specifically, the valve stem indicator assembly consists of a valve stem 8, an indicator rod 10 and a spring washer 11. The mark of the indicator rod 10 must be engraved as required. The valve stem 8 is processed from bottom to top and from thick to thin into an "I" type joint, a smooth thick rod and a trapezoidal threaded rod, and a threaded blind hole is also processed on its top; the lower end of the valve stem 8 is connected to the gate 17, and the rest of the part passes through the valve cover, the supporting flange and the center hole of the gear drive assembly 7, and then the indicator rod 10 and the spring washer 11 are installed and fixed. The indicator rod 10 is a screw rod with a screw at the lower end. The valve body is a smooth cylinder with ten equally spaced horizontal encircling scale lines on its outer surface. Four sets of equivalent aperture values ​​are evenly distributed above each horizontal encircling scale line to facilitate observation from all sides. The total distance of the ten equally spaced horizontal encircling scale lines is the same as the channel hole diameter of the valve body 1 and the valve seat 19. The equivalent aperture values ​​above each scale line, starting from "φ0.00" from top to bottom to the maximum value, indicate the opening degree and adjustment status of the throttle valve, allowing users to calculate the flow rate according to on-site working conditions.

[0051] When the gear drive assembly 7 drives the valve stem indicator assembly and the gate throttling assembly to adjust flow, the indicator rod 10 in the valve stem indicator assembly will be at different heights relative to the upper end plane of the through-hole cover 9 in the gear drive assembly 7. The scale line and value on the surface of the indicator rod 10 aligned with the upper end plane of the through-hole cover 9 represent the adjusted equivalent aperture of the throttle valve. The flow adjustment of the present invention is limited to the ten levels specified by the scale lines on the surface of the indicator rod 10. Intermediate positions and intermediate values ​​are not allowed to prevent the gap between the throttling hole in the valve core 18 and the passage hole of the valve seat 19, which would accelerate the wear of the valve seat 19.

[0052] It should be noted that the terms "include", "comprises" or any other variations thereof in this document (in the absence of the first and second matters) are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also include elements that are inherent to such process, method, article or apparatus.

[0053] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An ultra-high pressure straight-through plate-type manual throttle valve, comprising a valve body (1), a gate throttle assembly, a valve cover (3), a supporting flange (5), a gear drive assembly (7), a valve stem indicator assembly, and matching seals and threaded connectors, characterized in that: The overall structure design of the ultra-high pressure tailless rising stem flat plate valve is adopted. A gate throttling assembly is installed in the valve cavity of the valve body (1). The valve body (1) and the valve cover (3) are connected by a sealing ring (2) and uniformly distributed stud nuts (4). The support flange (5) is fixed to the top of the valve cover (3) by a thread and a set screw (15). The support flange (5) is connected to the gear drive assembly (7) by a hexagonal bolt (6). The valve stem indicator assembly runs through the center of the valve cover (3), the support flange (5) and the gear drive assembly (7). The valve stem indicator assembly is connected to the gate throttling assembly. The gear drive assembly drives the valve stem indicator assembly and the gate embedded in the valve core to move up and down.

2. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 1, characterized in that: A hard alloy wear-resistant layer (24) is built-up welded on the hole wall of the outlet channel of the valve body (1).

3. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 1, characterized in that: The gate throttling assembly includes a gate (17), a valve core (18), a valve seat (19), a sand control plate (22) and a guide strip (23). The gate (17) abuts against the valve seats (19) on both sides, and the guide strips (23) are installed in the grooves on the front and rear sides of the gate (17); the two ends of the valve seat (19) are connected to the valve body (1), and an inner sealing ring (20) and an outer sealing ring (21) are installed in sequence from the inside to the outside between the opposing surfaces of the valve seat (19) and the valve body (1); A sand-proof plate (22) is installed between the valve seat (19) and the valve body (1), and the inner side of the sand-proof plate (22) contacts the side surface of the gate plate (17); The valve core (18) is embedded in the channel hole of the gate plate (17).

4. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 3, characterized in that: The valve core (18) and the valve seat (19) are both made of hard alloy material.

5. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 4, characterized in that: The valve core (18) is densely covered with throttle holes in the middle, and the throttle holes are located in the channel aperture formed by the valve body (1) and the valve seat (19), and are symmetrically distributed relative to the perpendicular bisector of the channel aperture; Except for the center line of the top row of throttling holes being a straight line, the center lines of the other throttling holes are all arc lines of the same radius, and the centers of the arc lines are all located on the perpendicular bisector of the channel aperture.

6. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 5, characterized in that: The throttle holes are divided into small throttle holes (18-1) and large throttle holes (18-2), the small throttle holes (18-1) are distributed on both sides of the throttle holes densely distributed in the valve core (18), and the large throttle holes (18-2) are located in the middle of the throttle holes densely distributed in the valve core (18); The small throttle hole (18-1) and the large throttle hole (18-2) both have safety boundaries (18-3) with the same wall thickness, wherein the safety boundaries (18-3) of the large throttle hole (18-2) are only tangent but not intersecting.

7. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 6, characterized in that: The valve stem indicator assembly comprises a valve stem (8), an indicator rod (10) and a spring washer (11); the trapezoidal threaded rod in the valve stem (8) is connected to a valve stem nut (13) in the gear drive assembly (7); and the valve stem nut (13) is installed in a spline hole in the center of a large bevel gear in the gear drive assembly (7); The indicating rod (10) is installed on the upper end of the valve stem (8), and a spring washer (11) is installed at the connection between the indicating rod (10) and the valve stem (8).

8. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 7, characterized in that: A through-hole cover (9) is installed on the gear drive assembly (7), an O-type sealing ring (12) is installed on the inner ring of the through-hole cover (9), and the O-type sealing ring (12) abuts against the outer peripheral surface of the indicator rod (10); Ten equally spaced horizontal encircling scale lines are engraved on the outer circumference of the indicator rod (10), and four groups of values ​​of the same equivalent aperture are evenly distributed above each of the horizontal encircling scale lines; The sum of the distances of the ten equally spaced horizontal encircling scale lines is the same as the diameter of the passage holes of the valve body (1) and the valve seat (19); The values ​​of the equivalent aperture above each horizontal encircling scale line start from "φ0.00" from top to bottom to the maximum value.

9. The ultra-high pressure straight-through plate-type manual throttle valve according to claim 1, characterized in that: A sealing assembly (14) is installed in the central hole above the valve cover (3), and the sealing assembly (14) abuts against the outer peripheral surface of the valve stem (8); A through hole is provided on the side wall of the valve cover (3), and a grease injection valve (16) is sealed and installed in the through hole.

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