High-pressure straight-through plate type manual throttling valve

Abstract

A high-pressure straight-through plate-type manual throttle valve adopts the overall structural design of a high-pressure stemless, rising-stem plate valve. A gate throttling component is installed within the valve cavity of the valve body. A valve cover component is fixed above the valve body using sealing gaskets and evenly distributed studs and nuts. Above the valve cover component, a support component and a handwheel drive component are fixed via threads and set screws. A valve stem indicator component passes through the center of the valve cover component, support component, and handwheel drive component, connecting with the gate throttling component within the valve cavity. The handwheel drives the valve stem indicator component and the gate, which houses the valve core, to move up and down, changing the number of throttling orifices in the valve core relative to the fixed valve seat channels on both sides, thus regulating the flow rate. Because both the valve core and valve seat are made of hard alloy material, equipped with a composite elastic sealing ring, and a hard alloy wear-resistant layer is welded onto the outlet channel wall of the valve body, this valve becomes a new type of throttle valve characterized by high pressure resistance, low resistance, low energy consumption, accurate metering, long service life, and ease of production.

Description

Technical Field

[0001] This utility model relates to a "plate-type throttle valve" used in industries such as petrochemical machinery. Background Technology

[0002] Currently, the vast majority of throttle valves used in petrochemical machinery are right-angle bend throttle valves, meaning that the fluid undergoes a right-angle turn when passing through the throttling component of the valve, thus meeting the throttling and reversing requirements of many devices. A few existing straight-through throttle valves, while outwardly appearing as a straight line with flanges at both ends, employ an inclined and tortuous flow path and a right-angle bend throttling component internally, thus their fundamental nature remains unchanged. Right-angle bend or inclined and tortuous flow path throttle valves, under the impact of high-pressure or ultra-high-pressure sand-containing fluids, suffer from problems such as "easy valve body breakdown, rapid wear of the valve core and seat, high flow resistance and energy consumption, and inaccurate metering." Furthermore, it has long been a consensus in the petroleum machinery industry that "straight-through flat gate valves cannot be used as throttling valves." There are two main reasons for this consensus: first, during throttling, a deep groove forms between the gate orifice and the valve seat orifice, which in turn triggers 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 low-carbon alloy steel with a tungsten carbide coating, lacking durable wear resistance. Once the sealing performance of the flat gate valve is compromised, it quickly loses its functionality, resulting in significant economic losses. Therefore, this consensus, formed based on the lessons learned from flat gate valves, has had some negative impact on the design of subsequent straight-through throttling valves.

[0003] However, there is an objective demand for straight-through throttle valves in the petrochemical machinery industry. High-pressure throttle valves with working pressures of 14MPa to 105MPa are currently the most widely used and most influential type of throttle valve in the petrochemical machinery industry. Therefore, it is necessary to design a high-pressure straight-through throttle valve with a high standardization coefficient, easy mass production, no valve body breakdown, long valve core and seat life, low flow resistance and low energy consumption, and more accurate metering. Utility Model Content

[0004] The purpose of this invention is to address the problems of existing right-angle turn-type throttle valves by combining the high-pressure resistance technology of straight-through plate gate valves of the same pressure level to create a new straight-through plate throttle valve with outstanding performance suitable for use under high-pressure conditions of 14MPa to 105MPa.

[0005] This utility model is composed of a valve body, a gate throttling component, a valve cover component, a support component, a handwheel drive component, a valve stem indicator component, and matching seals and threaded connections. Its key feature is that it adopts the overall structural design of a high-pressure, stemless, rising-stem flat valve. A gate throttling component is installed within the valve cavity of the valve body. The valve cover component is fixed above the valve body using sealing gaskets and evenly distributed studs and nuts. Above the valve cover component, the support component and handwheel drive component are fixed above it using threads and set screws. The valve stem indicator component passes through the center of the valve cover component, support component, and handwheel drive component, connecting with the gate throttling component within the valve cavity. The handwheel drive component drives the valve stem indicator component and the gate containing the valve core to move up and down, adjusting the flow rate by changing the number of valve core throttling orifices in the valve seat channels fixed on both sides.

[0006] Furthermore, a hard alloy wear-resistant layer is overlaid on the entire wall of the valve body outlet channel.

[0007] Furthermore, two threaded holes are drilled on the upper circumference of the support cover in the support component, and a locking screw and an oil cup are respectively installed in the two threaded holes. The locking screw can contact the valve stem nut in the handwheel drive component to lock.

[0008] Furthermore, the gate throttling component consists of a gate, a valve core, valve seats on both sides, an inner sealing ring, an outer sealing ring, a sandproof plate, and guide strips on both sides; the valve core is made of hard alloy material, with a step machined on its circumference and numerous throttling holes densely distributed in the middle, which are embedded in the original channel hole of the gate.

[0009] Furthermore, the valve seats on both sides of the gate are all made of hard alloy material, and the inner and outer sealing rings that match the valve seats are both composite elastic sealing rings.

[0010] Furthermore, the indicator sleeve in the valve stem indicator component is a hollow cylinder with an open top cover. On the outer circumference of the cylinder, ten equally spaced horizontal encircling scale lines are engraved. Above each horizontal encircling scale line, four sets of equivalent orifice diameter values ​​are evenly distributed. The total distance between the ten equally spaced horizontal encircling scale lines is the same as the diameter of the channel hole of the valve body and valve seat. The equivalent orifice diameter values ​​above each scale line start from "φ0.00" from top to bottom and go up to the maximum value.

[0011] Because this utility model adopts the overall structural design of a high-pressure stemless, rising-stem flat plate valve, the commonality rate of components between the two is over 85%, which is highly beneficial for organizing mass production and reducing production costs. The hard alloy valve core is embedded in the original channel hole of the gate, and with its unique throttling orifice distribution design, the problems of deep grooves and accelerated wear between the gate hole and the valve seat hole, as seen in previous designs, are completely avoided. Furthermore, the valve seat is entirely made of hard alloy material, equipped with a composite elastic sealing ring, and a hard alloy wear-resistant layer is welded onto the hole wall of the valve body outlet channel, giving it durable wear resistance. The clearly defined number of slender throttling orifices in the valve core, with the same thickness as the gate, will not be easily worn or deformed, maintaining flow stability and metering accuracy for a long time. In addition, the handwheel drive component can accurately drive the valve stem indicator component for flow regulation, and the locking screws in the support component prevent accidental movement and inaccuracy, ultimately making it a high-performance high-pressure straight-through plate throttling valve product. Attached Figure Description

[0012] Figure 1 This is a schematic cross-sectional view of the overall structure of this utility model; Figure 2 This utility model Figure 1 A partial cross-sectional view of the valve body at point AA below the valve body; Figure 3 This utility model Figure 1 In the middle, a magnified schematic diagram of the valve core from direction B; Figure 4 This utility model Figure 1 In the middle, an enlarged schematic diagram of the cross-section of the inner sealing ring; The component names shown in the diagram are as follows: 1. Valve body, 2. Sealing gasket, 3. Valve cover, 4. Stud nut, 5. Support cover, 6. Spacer, 7. Locking screw, 8. Thrust bearing, 9. Valve stem nut, 10. Handwheel, 11. Set screw, 12. Valve stem, 13. Indicator sleeve, 14. Screw washer, 15. Type O seal ring, 16. Flat key, 17. Type O seal ring, 18. Oil cup, 19. Sealing assembly, 20. Set screw, 21. Grease injection valve, 22. Gate, 23. Valve core, 23-1. Small throttling orifice, 23-2. Large throttling orifice, 23-3. Safety line, 24. Valve seat, 25. Inner sealing ring, 26. Outer sealing ring, 27. Sandproof plate, 28. Guide strip, 29. Wear-resistant layer. Detailed Implementation

[0013] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings: Figure 1 , Figure 2In this invention, the valve body 1, gate throttling component, valve cover component, support component, handwheel drive component, valve stem indicator component, and matching sealing component and threaded connection component are combined. It directly adopts the overall structural design of high pressure tailless rising stem flat valve and its existing components. In addition to improving the standardization coefficient, facilitating mass production and reducing production costs, it also best reflects the technical advantages of straight flow channel and plate throttling. This utility model uses a valve body 1 as a carrier. A modified gate throttling component is installed in the valve cavity of the valve body 1. A sealing gasket ring 2 and evenly distributed stud nuts 4 are used to connect and fix the valve body 1 to the valve cover component. A support component and a handwheel drive component are fixed above the valve cover component by threads and set screws 20. A valve stem indicator component passes through the center of the valve cover component, the support component and the handwheel drive component, and is connected to the gate throttling component in the valve cavity. The handwheel drive component drives the valve stem indicator component and the gate 22 with the valve core 23 embedded in it to move up and down. The number of throttling holes of the valve core 23 in the channel holes of the valve seats 24 fixed on both sides changes, thereby adjusting the flow rate.

[0014] The valve body 1 of this invention is a commonly used component. The valve body 1 has a cylindrical body with a blind-hole valve cavity in the middle, and extended necked flanges at both ends. The center of each necked flange has left and right channel holes perpendicular to the valve cavity hole. Mounting holes for valve seats 24 are enlarged at the intersection of the left and right channel holes and the valve cavity hole. A trapezoidal gasket groove and evenly distributed stud holes are machined on the end faces of the necked flanges at both ends for external connection. A trapezoidal gasket groove and evenly distributed threaded blind holes are machined on the top of the central cylindrical body of the valve body 1 for connecting the valve cover component. Due to the changed application of the valve body 1, this invention features a hard alloy wear-resistant layer 29 welded onto the entire wall of the outlet channel of the valve body 1 to withstand the scouring of high-speed sand-containing fluid after throttling.

[0015] The gate throttling component of this utility model consists of a gate 22, a valve core 23, valve seats 24 on both sides, an inner sealing ring 25, an outer sealing ring 26, a sandproof plate 27, and guide strips 28 on both sides. It is symmetrically installed from top to bottom within the valve cavity of the valve body 1. Except for the valve core 23, which is a new part, and the valve seat 24, which uses a different material, all other components are existing common parts. The gate 22 is a rectangular parallel gate. Its upper end is connected to the lower end of the valve stem by an "I"-shaped joint with a "⊥"-shaped groove. Valve seats 24 are installed on both sides. The contact points between the valve seats 24 and the valve body 1 are fitted with an inner sealing ring 25 and an outer sealing ring 26. A sandproof plate 27 is installed below the valve seat 24. The front and rear sides are limited by through-grooves and guide strips 28. The valve core 23 is made of hard alloy material, with a step machined on its circumference and numerous throttling holes densely distributed in the middle. It is embedded in the original channel hole of the gate plate 22 and ground flat together with the tungsten carbide sealing surface sprayed on both sides of the gate plate 22.

[0016] Figure 3In this invention, the valve core 23 is densely covered with throttling orifices, located within the channel diameter of the valve body 1 and valve seat 24. These orifices are symmetrically distributed relative to the vertical bisector of the channel diameter. Except for the top row of throttling orifices, whose center-to-center line is a straight line, the center-to-center lines of the remaining nine rows of throttling orifices are all arcs of the same radius, with the center of each arc located on the vertical bisector of the channel diameter. The densely covered throttling orifices in the center of the valve core 23 are divided into small throttling orifices 23-1 and large throttling orifices 23-1. There are two types. The smaller throttling orifices 23-1 are located on both sides of the densely packed throttling orifices. The larger throttling orifices 23-2 are sandwiched between the smaller throttling orifices 23-1 on both sides. Both the smaller throttling orifices 23-1 and the larger throttling orifices 23-2 have safety boundaries 23-3 with the same wall thickness. The safety boundaries 23-3 of the larger throttling orifices 23-2 are only tangent and do not intersect, so as to ensure that the throttling orifices are unobstructed during flow regulation and have durable and wear-resistant wall thickness.

[0017] The valve seat 24 of this invention is a tubular short section part, with an inner channel hole and an outer cylinder. A groove for disassembly and assembly is machined on both its inner and outer circumferential walls. The inner end is a metal sealing surface, and the outer end face is machined with two annular sealing grooves of different diameters, each containing an inner sealing ring 25 and an outer sealing ring 26. As the core components of the throttle valve, the valve seats 24 on both sides of the gate of this invention are entirely made of hard alloy material to ensure a long service life. Figure 4 In this design, both the inner sealing ring 25 and the outer sealing ring 26, which are matched with the valve seat 24, are composite elastic sealing rings. The radial cross-section of the outer main ring of the composite elastic sealing ring is U-shaped, and it is molded from PEEK polyether ether ketone special engineering plastic. Within the U-shaped opening of the main ring, there is a metal spring ring with a V-shaped radial cross-section. The V-shaped metal spring ring is made of Elgiloy non-magnetic alloy thin steel sheet through stamping and welding. Within the V-shaped metal spring ring, there is a polymer material ring with a rectangular radial cross-section and chamfered edges. The differences between the inner sealing ring 25 and the outer sealing ring 26 are: firstly, their diameters are different; secondly, the U-shaped main ring opening of the inner sealing ring 25 faces inward, while the U-shaped main ring opening of the outer sealing ring 26 faces outward.

[0018] The sandproof plate 27 of this invention is a rectangular steel plate with smooth flat surfaces on the left and right sides. A small pressure-balancing hole is drilled below the center line of the flat surface. There is an arc-shaped notch on the top edge that connects to the valve seat 24, and the bottom edge contacts the bottom of the valve cavity. The front and rear edges are arc-shaped edges that fit into the cylindrical valve cavity. The intersection of the two arc-shaped edges and the bottom edge is a large chamfer for easy installation inside the valve cavity. Two sandproof plates 27 are used opposite each other, sandwiching the gate plate 22 and valve core 23 on both sides to prevent sand and other impurities from entering the valve cavity. The guide strip 28 of this invention is made of thin steel plate by stamping. Its cross-section is arc-shaped and elastic. It is inserted on both sides of the gate plate 22 to prevent the gate plate from shifting.

[0019] The valve cover component of this utility model consists of a valve cover 3, a sealing assembly 19, and a grease injection valve 21, all of which use existing common parts. The upper end of the valve cover 3 is a hollow stud with a small diameter and a relief groove, used to connect the support component; the lower end is a hollow cylinder with a larger diameter, and the bottom of the hollow cylinder is machined with a trapezoidal washer groove and evenly distributed stud holes for connecting the valve body 1; the center of the valve cover 3 has threaded holes and cylindrical holes of different diameters, with the upper end facing downwards having a smaller diameter threaded hole and a cylindrical stepped hole, used to install the combined seal 19; the lower end facing upwards has a large cylindrical hole with the same diameter as the valve cavity and a shallow depth, 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, there is a stepped hole with a tapered thread at the inlet, and the grease injection valve 21 is installed in the hole to inject sealing grease into the valve to improve the sealing performance of the valve, or to release residual pressure in the valve cavity during maintenance.

[0020] The sealing assembly 19 in the valve cover component of this utility model is composed of a packing gland, a metal gasket, three sealing rings with different cross-sections, and a U-shaped retaining ring stacked together. The three sealing rings with different cross-sections are: the top layer is a sealing ring with a square V-groove cross-section, the second layer is a sealing ring with a symmetrical wing-shaped cross-section, and the third layer is a composite sealing ring with a bell-shaped cross-section. When stacked: the V-shaped groove under the top sealing ring matches the tip of the second sealing ring, the V-shaped groove and square groove under the second sealing ring match the tip of the third composite sealing ring with a bell-shaped cross-section, and the long handle above the U-shaped retaining ring is inserted into the inner cavity below the third composite sealing ring with a bell-shaped cross-section to seal the valve stem 12. In addition, to cope with high-pressure or ultra-high-pressure operating conditions, the entire body of the square V-groove section sealing ring, the symmetrical wing section sealing ring, and the ⊥-shaped retaining ring in the combined seal 19, as well as the shells of the short-handle bell-shaped section composite sealing ring and the long-handle bell-shaped section composite sealing ring, are all molded from "PEEK polyether ether ketone" special engineering plastic; in the inner cavity of the short-handle bell-shaped section composite sealing ring, there is a ring spring with the top bent into an arc and a V-shaped section; the ring springs are all made of "Elgiloy" non-magnetic alloy thin steel plate by stamping and welding.

[0021] The support component of this utility model consists of a support cover 5, a spacer 6, a locking screw 7, an oil cup 18, and a set screw 20. Except for the locking screw 7, which is a newly added part, all other components are directly adopted from existing common parts. It is used to connect the valve cover component and install the handwheel drive component. The support cover 5 of this utility model is a hollow cylinder with an open top cover. Its bottom end is connected to the stud at the upper end of the valve cover 3 by a threaded hole, and then fixed with two set screws 20. Two threaded holes are drilled on the upper circumference of the support cover 5 in the support component. The locking screw 7 and the oil cup 18 are respectively installed in the two threaded holes. The locking screw 7 can contact and lock the valve stem nut 9 in the handwheel drive component. The spacer 6 is a completely hollow cylindrical part, installed in the middle position inside the support cover 5, supporting the handwheel drive component.

[0022] The handwheel drive component of this utility model consists of a thrust bearing 8, a valve stem nut 9, a handwheel 10, a set screw 11, an O-type sealing ring 15, a flat key 16, and an O-type sealing ring 17, all of which use existing common parts. The valve stem nut 9 of this utility model has a sealing groove and a raised shoulder machined on its lower, thicker cylindrical body, and a keyway machined on its upper, thinner cylindrical body. From top to bottom, a deep cylindrical hole with a sealing groove, a trapezoidal threaded hole, and a shallow cylindrical hole are machined in its center. A thrust bearing 8 is mounted on the upper and lower surfaces of the raised shoulder of the valve stem nut 9, carrying the O-type sealing rings 15 and 17, and installed inside the upper end of the support housing 5. The slender neck of the valve stem nut 9 extends out of the opening top cover of the support housing 5 and is connected and fixed to the handwheel 10, the set screw 11, and the flat key 16.

[0023] The valve stem indicating component of this utility model consists of a valve stem 12, an indicating sleeve 13, and a screw washer 14, all of which are general-purpose parts, but the surface scale lines and markings of the indicating sleeve 13 are different. The valve stem 12 of this utility model is machined from bottom to top and from thick to thin into an "I"-shaped joint, a smooth thick rod, a trapezoidal threaded rod, and a smooth thin rod, with a threaded blind hole machined at its top. The lower end of the valve stem 12 connects to the gate plate 22, and the remaining part passes through the central holes of the valve cover component, the support component, and the handwheel drive component, before the indicating sleeve 13 is fitted on and fixed with the screw washer 14. The indicator sleeve 13 in the valve stem indicator component is a hollow cylinder with an open top cover. Ten equally spaced horizontal scale lines are engraved on the outer surface of the cylinder. Above each horizontal scale line are four sets of values ​​for the same equivalent orifice diameter, facilitating observation from all sides. The total distance between the ten equally spaced horizontal scale lines is the same as the diameter of the channel orifice of the valve body 1 and valve seat 24. The equivalent orifice diameter values ​​above each scale line, from top to bottom, start from "φ0.00" and go up to the maximum value, indicating the opening degree and adjustment status of the throttle valve, allowing users to calculate the flow rate based on on-site conditions. The maximum equivalent orifice diameter used for throttling in this invention should be designed according to the diameter of the throttle valve inlet channel and the customer's throttling requirements. Figure 3 The values ​​displayed by the densely packed throttling orifices of the valve core 23 and the indicator sleeve 13 are only one embodiment of the present invention with an inlet channel diameter of 65mm.

[0024] The value displayed by the indicator sleeve

[0025] When the handwheel drive component drives the valve stem indicator component and the gate throttling component to adjust the flow rate, the indicator sleeve 13 in the valve stem indicator component will have a different height relative to the upper plane of the valve stem nut 9 in the handwheel drive component. The circumferential scale lines and values ​​on the surface of the indicator sleeve 13, which are aligned with the upper plane of the valve stem nut 9, represent the adjusted equivalent orifice diameter of the throttling valve. At this time, the locking screw 7 in the support component must be used to lock the valve stem nut 9 in the handwheel drive component to prevent unnecessary rotation, thereby ensuring the accuracy and stability of the flow rate. The flow rate adjustment of this utility model is limited to the ten levels specified by the circumferential scale lines on the surface of the indicator sleeve 13. The use of intermediate positions and intermediate values ​​is not allowed to prevent bumps between the throttling orifice in the valve core 23 and the channel hole in the valve seat 24, which would accelerate the wear of the valve seat 24.

[0026] The gate throttling component of this invention can be replaced after wear, thereby significantly extending the service life of the throttling valve and producing better performance.

Claims

1. A high-pressure straight-through type plate-type manual throttle valve, comprising a valve body, a gate throttling component, a valve cover component, a support component, a handwheel drive component, a valve stem indicating component, and matching seals and threaded connections, characterized in that: The overall structure adopts a high-pressure stemless, rising stem flat plate valve design. A gate throttling component is installed within the valve cavity of the valve body. A valve cover assembly is fixed above the valve body using sealing gaskets and evenly distributed studs and nuts. Above the valve cover assembly, a support assembly and a handwheel drive assembly are fixed via threads and set screws. A valve stem indicator runs through the center of the valve cover assembly, support assembly, and handwheel drive assembly, connecting with the gate throttling component within the valve cavity. The handwheel drive assembly drives the valve stem indicator and the gate plate, which houses the valve core, to move up and down, adjusting the flow rate by changing the number of valve core throttling orifices in the valve seat channels fixed on both sides.

2. The high-pressure straight-through type plate-type manual throttle valve according to claim 1, characterized in that: The entire valve body outlet channel hole wall is overlaid with a hard alloy wear-resistant layer.

3. The high-pressure straight-through type plate-type manual throttle valve according to claim 1, characterized in that: Two threaded holes are drilled on the upper circumference of the support cover in the support component. A locking screw and an oil cup are installed in the two threaded holes respectively. The locking screw can contact the valve stem nut in the handwheel drive component to lock.

4. The high-pressure straight-through type plate-type manual throttle valve according to claim 1, characterized in that: The gate throttling component consists of a gate, a valve core, valve seats on both sides, an inner sealing ring, an outer sealing ring, a sandproof plate, and guide strips on both sides. The valve core is made of hard alloy material, with a step machined on its circumference and numerous throttling holes densely distributed in the middle, which are embedded in the original channel hole of the gate. The valve seats on both sides of the gate are all made of hard alloy material. The inner and outer sealing rings that match the valve seats are both composite elastic sealing rings. The radial cross-section of the outer main ring of the composite elastic sealing ring is U-shaped and is molded from "PEEK polyether ether ketone" special engineering plastic. The U-shaped opening of the main ring contains a metal spring ring with a radial cross-section of V-shaped. The V-shaped metal spring ring is stamped and welded from "Elgiloy" non-magnetic alloy thin steel plate. The V-shaped metal spring ring contains a polymer material ring with a radial cross-section of rectangle and chamfered corners.

5. The high-pressure straight-through type plate-type manual throttle valve according to claim 4, characterized in that: The valve core is densely packed with throttling orifices, located within the channel diameter of the valve body and valve seat, and symmetrically distributed with respect to the vertical bisector of the channel diameter. Except for the top row of throttling orifices, whose center line is a straight line, the center lines of the other nine rows of throttling orifices are all arcs of the same radius, and the center of each arc is located on the vertical bisector of the channel diameter.

6. The high-pressure straight-through type plate-type manual throttle valve according to claim 5, characterized in that: The valve core is densely covered with throttling orifices, which are divided into small throttling orifices and large throttling orifices. The small throttling orifices are located on both sides of the densely covered throttling orifices, and the large throttling orifices are surrounded by the small throttling orifices on both sides. Both small throttling orifices and large throttling orifices have safety boundaries with the same wall thickness. The safety boundaries of the large throttling orifices are tangent but do not intersect.

7. The high-pressure straight-through type plate-type manual throttle valve according to claim 1, characterized in that: The indicator sleeve in the valve stem indicator component is a hollow cylinder with an open top cover. On the outer surface of the cylinder, there are ten equally spaced horizontal encircling scale lines. Above each horizontal encircling scale line, there are four sets of values ​​for the same equivalent orifice diameter. The total distance between the ten equally spaced horizontal encircling scale lines is the same as the diameter of the channel hole of the valve body and valve seat. The equivalent orifice diameter values ​​above each scale line start from "φ0.00" from top to bottom and go up to the maximum value.

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