A four-stage step-down regulating valve

Abstract

The present invention relates to the technical field of regulating valve structures, and is used to extend the service life of regulating valves. Specifically, it relates to a four-stage pressure-reducing regulating valve, which includes a valve body assembly. The valve body assembly includes a valve seat, an integrated valve core and valve stem, and a valve cage. The upper end of the valve body assembly is connected to a valve cover through a bolt assembly. An inlet flow channel, an inlet buffer inner cavity, an outlet buffer inner cavity, and an outlet flow channel are provided inside the valve body assembly. The first pressure-reducing area is the inlet buffer inner cavity; the second pressure-reducing area is the first buffer flow channel provided on the valve seat, and a flow channel small hole is provided at the lower end of the valve seat; the valve core includes a first valve core and a second valve core, and the third pressure-reducing area includes a second buffer flow channel provided on the valve seat between the first valve core and the second valve core; the fourth pressure-reducing area includes a labyrinth structure of multiple small holes and flow channels provided on the valve cage; through four-stage pressure reduction treatment, problems such as erosion, cavitation, and vibration of the valve during high-pressure difference operation and inconvenience during maintenance are solved, and the service life of the valve can be greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of regulating valve structures, and is used for prolonging the service life of a regulating valve, in particular to a four-stage pressure-reducing regulating valve. Background Art

[0002] Valves are control components in fluid delivery systems and have functions such as diverting, intercepting, regulating, throttling, preventing backflow, diverting or overflowing and relieving pressure.

[0003] Existing throttle valves are usually composed of a valve body, a lower valve body, a valve core and a valve cage seat. During the use of conventional control valves, only a small flow rate needs to be adjusted under certain high pressure differences or conventional working conditions. However, in this case, the medium is prone to cavitation and flash evaporation, which will cause erosion on the sealing surface of the valve trim. At the same time, cavitation and flash evaporation are also likely to cause vibration of the valve trim, which will greatly reduce its adjustment performance, sealing effect and life. Summary of the invention

[0004] In view of the problem that the regulating valve in the prior art is easily eroded and cavitated, resulting in low regulating performance, poor sealing effect and short service life of the regulating valve, the present application proposes a four-stage pressure-reducing regulating valve. During use, it uses a four-stage pressure-reducing treatment to effectively solve the problems of erosion, cavitation, vibration and the inconvenience during maintenance when the valve works under high pressure difference, and can greatly improve the service life of the valve.

[0005] In order to achieve the above-mentioned purpose, the present invention provides a four-stage step-down regulating valve, including a valve body assembly, wherein the valve body assembly includes a valve seat, a valve core, a valve stem, and a valve cage. The upper end of the valve body assembly is connected to a valve cover by a bolt assembly. An inlet flow channel, an inlet buffer inner cavity, an outlet buffer inner cavity, and an outlet flow channel are provided inside the valve body assembly. The first pressure relief zone is the inlet buffer inner cavity; the second pressure relief zone is the first buffer flow channel provided on the valve seat, and a flow channel hole is provided at the lower end of the valve seat; the valve core includes a first valve core and a second valve core, and the third pressure relief zone includes a second buffer flow channel provided on the valve seat between the first valve core and the second valve core; the fourth pressure relief zone includes a maze structure of multiple layers of small holes and flow channels provided on the valve cage.

[0006] The technical solution of the present application is to set up four pressure relief zones, wherein in the first pressure relief zone, the inlet flow channel is appropriately reduced by calculating the flow rate, thereby playing a throttling effect to a certain extent; when the medium enters the buffer inner cavity arranged on the valve body assembly, it can play an effective buffering effect; in the second pressure relief zone, appropriate flow channel holes are opened at the lower end of the valve seat, and the medium enters the secondary throttling pressure relief zone through the flow channel holes to mix the flow, so that the flow direction of the medium is more uniform, the eccentric wear of the valve core is reduced, and the pressure relief effect is played again; in the third pressure relief zone, the flow rate is adjusted by the distance between the first valve core head and the second valve core head, and a second buffer flow channel is provided on the valve seat, and the medium is throttled and reduced pressure again when passing through the sealing surface of the valve core and the valve seat; in the fourth pressure relief zone, multiple layers of small holes and flow channels are opened on the valve cage, so that the medium is not easy to cause an instantaneous explosive force from high pressure to low pressure when passing through the valve seat and the valve core sealing surface, thereby effectively protecting the sealing surface of the valve core and the valve seat and extending the service life.

[0007] The inlet flow channel calculates the flow rate and appropriately reduces the diameter, so that the buffer cavity is as large as possible, and the medium enters the buffer cavity to effectively release energy.

[0008] The inlet position of the inlet flow channel of the present application is inclined downward. Because the valve is used with a large pressure difference and a high flow rate of the medium, the first flushing point of the medium is placed on the shell that does not have a sealing function. The valve body adopts specially designed forgings, which is 1 / 3 larger than the valve body of an ordinary valve of the same specification. The shell wall thickness is thickened and the valve cavity volume is increased to ensure that the buffer area can meet the requirements of use.

[0009] In this application, the valve core and the valve stem are processed with an integral material, the strength of the valve core is better, and the guidance is more stable and reliable. The valve stem adopts a body modification processing technology, and the surface finish of the valve stem can reach Ra≤0.08μm. At the same time, the surface hardness is increased by 20%-45%, which is not easy to wear, and there is little resistance when the valve stem moves up and down; the valve core, valve body, valve seat, and stuffing box are all on the same center point, so that the valve core will not get stuck during the adjustment process, and the sealing performance is better and the service life is longer.

[0010] Furthermore, the bolt assembly includes bolt holes arranged on the valve body assembly and the valve cover, the bolt holes are connected with bolts that cooperate with and lock with the bolt holes, and the bolts are connected with nuts.

[0011] The present application connects the valve body assembly and the valve cover by means of a bolt assembly, which can not only improve the fixing effect between the two, but also facilitate the disassembly and installation of the valve body assembly and the valve cover when the entire structure needs to be repaired.

[0012] Furthermore, no channel hole is provided on the 1 / 4 circle of the lower end of the valve seat facing the first buffer flow channel.

[0013] In the present application, small holes that meet the flow rate are provided at the lower end of the buffer area at the lower end of the valve seat. No small holes are drilled at the end facing the inlet (1 / 4 circle) to prevent the medium from directly scouring the head of the valve core. The buffer area is lengthened to cause the medium to form a mixed flow in the buffer area and change the flow direction of the medium, thereby achieving the effect of allowing the medium to pass smoothly through the head of the first valve core.

[0014] Further, the flow-through area of the inlet buffer inner cavity is more than 3 times that of the inlet flow channel.

[0015] In the present application, the flow-through area of the buffer inner cavity is made more than 3 times that of the inlet flow channel. When the medium enters this area, it can effectively play a buffering role.

[0016] Further, the valve seat is an independent valve seat.

[0017] In the present application, the valve seat is set as an independent valve seat, which is convenient for disassembly and simple for maintenance. Moreover, the valve seat adopts a two-stage pressure reduction structure: in the first stage, a very large buffer area is provided at the lowermost end of the valve seat. At the lower end of the buffer area at the lower end of the valve seat, small holes that meet the flow rate are provided. No small holes are drilled at the end facing the inlet (1 / 4 circle) to prevent the medium from directly scouring the head of the valve core. The buffer area is lengthened to cause the medium to form a mixed flow in the buffer area and change the flow direction of the medium, allowing the medium to pass smoothly through the head of the first valve core; in the second stage, a double valve core structure is adopted. The double valve core heads can effectively slow down the flow rate of the medium, and a buffer area is provided between the head of the first valve core and the head of the second valve core, which again plays an effective role in reducing the speed and pressure, enabling the flow direction and speed of the medium to pass more smoothly through the valve sealing surface and reducing the damage to the sealing surface.

[0018] Further, the valve cage, the valve seat, the valve core, the valve body assembly, and the valve cover are all on the same central dot.

[0019] In the present application, the valve cage, the valve seat, the valve core, the valve body assembly, and the valve cover are all set on the same central dot, ensuring the overall concentricity and the smoothness of the valve core during movement.

[0020] Further, the seal of the valve body assembly adopts a laminated metal wound seal.

[0021] The valve body seal in the present application adopts a laminated metal wound seal, which has a simple structure, good sealing effect, and is convenient for disassembly and inspection.

[0022] Further, multiple layers of small holes and flow channels are provided on the valve cage.

[0023] In the present application, by providing multiple layers of small holes and flow channels on the valve cage in the fourth pressure reduction area, it is not easy to generate an instantaneous explosive force from high pressure to low pressure when the medium passes through the valve seat and the valve core sealing surface, thereby effectively achieving the effect of protecting the sealing surfaces of the valve core and the valve seat.

[0024] In summary, the beneficial effects of the present invention compared with the prior art are as follows:

[0025] (1) The four-stage step-down regulating valve of the present application effectively solves the problems of erosion, cavitation, vibration, etc. of the valve during high-pressure difference operation and the inconvenience during maintenance, and can greatly improve the service life of the valve;

[0026] (2) The inlet position of the inlet flow channel of the present application is inclined downward. Because the pressure difference of the valve is large and the flow rate of the medium is high, the first erosion point of the medium is placed on the housing that does not play a sealing role. The valve body is made of a specially designed forging, which is 1 / 3 larger than the valve body of a common valve of the same specification. While the wall thickness of the housing is thickened, the valve cavity volume is increased to ensure that the buffer area meets the use requirements;

[0027] (3) The valve body assembly and the valve cover are connected by a bolt assembly in the present application, which can not only make the fixing effect between the two better, but also facilitate the disassembly and installation of the valve body assembly and the valve cover when the whole structure needs to be repaired;

[0028] (4) Small holes meeting the flow rate are arranged at the lower end of the buffer area at the lower end of the valve seat in the present application. No small holes are drilled at the end (1 / 4 circle) facing the inlet to prevent the medium from directly flushing the head of the valve core. The buffer area is lengthened, so that the medium forms a mixed flow in the buffer area, changing the flow direction of the medium, and the effect of allowing the medium to pass through the head of the first valve core smoothly can be achieved;

[0029] (5) The cross-sectional area of the buffer inner cavity in the present application is made more than 3 times that of the inlet flow channel. When the medium enters this area, it can effectively play a buffering role;

[0030] (6) The valve seat in the present application is set as an independent valve seat, which is convenient for disassembly and simple to maintain; moreover, the valve seat adopts a two-stage step-down structure: in the first stage, a very large buffer area is provided at the lowermost end of the valve seat. There are small holes meeting the flow rate at the lower end of the buffer area at the lower end of the valve seat. No small holes are drilled at the end (1 / 4 circle) facing the inlet to prevent the medium from directly flushing the head of the valve core. The buffer area is lengthened, so that the medium forms a mixed flow in the buffer area, changing the flow direction of the medium, and allowing the medium to pass through the head of the first valve core smoothly; in the second stage, a double-valve-core structure is adopted. The double-valve-core heads can effectively slow down the flow rate of the medium, and a buffer area is provided between the head of the first valve core and the head of the second valve core, which plays an effective role in reducing the speed and pressure again, so that the flow direction and speed of the medium pass through the valve sealing surface more smoothly, reducing the damage to the sealing surface;

[0031] (7) The valve cage, valve seat, valve core, valve body assembly and valve cover in the present application are all set on the same central dot, ensuring the overall concentricity and the smoothness of the valve core during movement;

[0032] (8) In this application, the valve core and the valve stem are processed from a single piece of material, resulting in better strength and more stable and reliable guidance for the valve core. The valve stem part adopts a body modification processing technology, with the surface finish of the valve stem reaching Ra ≤ 0.08μm. At the same time, the surface hardness is increased by 20% - 45%, making it not easily worn and having less resistance when moving the valve stem up and down; the valve core, valve body, valve seat, and stuffing box are all on the same central dot, so that the valve core will not get stuck during the adjustment process, with better sealing performance and longer service life;

[0033] (9) The valve body seal in this application adopts a laminated metal wound seal, which has a simple structure, good sealing effect, and is convenient for disassembly and inspection;

[0034] (10) In this application, by opening multiple layers of small holes and flow channels on the valve cage in the fourth pressure reduction area, it is not easy to generate an instantaneous explosive force from high pressure to low pressure when the medium passes through the valve seat and the sealing surface of the valve core, thus effectively achieving the effect of protecting the sealing surfaces of the valve core and the valve seat. Brief Description of the Drawings

[0035] Figure 1 is the overall structural schematic diagram of a four - stage pressure reducing regulating valve in the present invention;

[0036] Figure 2 is the structural schematic diagram of the first pressure reduction area of a four - stage pressure reducing regulating valve in the present invention;

[0037] Figure 3 is the structural schematic diagram of the second pressure reduction area of a four - stage pressure reducing regulating valve in the present invention;

[0038] Figure 4 is the structural schematic diagram of the third pressure reduction area of a four - stage pressure reducing regulating valve in the present invention;

[0039] Figure 5 is the structural schematic diagram of the fourth pressure reduction area of a four - stage pressure reducing regulating valve in the present invention;

[0040] Figure 6 is the cross - sectional view of the valve cage of a four - stage pressure reducing regulating valve in the present invention.

[0041] The labels in the figure are: valve body assembly 01, inlet flow channel 01 - 1, inlet buffer inner cavity 01 - 2, outlet buffer inner cavity 01 - 3, outlet flow channel 01 - 4, valve seat 02, first buffer flow channel 02 - 1, second buffer flow channel 02 - 2, flow channel small holes 02 - 3, integrated valve core and valve stem 03, first valve core 03 - 1, second valve core 03 - 2, valve cage 04, 04 - 1 multiple layers of small holes, valve cover 05, nut 06. Detailed Description of the Invention

[0042] All features disclosed in this specification, except for mutually exclusive features and / or steps, can be combined in any way.

[0043] To enable those skilled in the art to better understand the technical solution of the present invention, the following further elaborates on the present invention in conjunction with Figures 1-6 and specific embodiments.

[0044] Embodiment 1

[0045] Referring to Figures 1-6 , a four-stage step-down regulating valve provided by the present invention includes a valve body assembly 01. The valve body assembly 01 includes a valve seat 02, an integrated valve core valve stem 03, and a valve cage 04. The upper end of the valve body assembly 01 is connected with a valve cover 05 through a bolt assembly. An inlet flow channel 01-1, an inlet buffer inner cavity 01-2, an outlet buffer inner cavity 01-3, and an outlet flow channel 01-4 are opened inside the valve body assembly 01. The first decompression area is the inlet buffer inner cavity 01-2; the second decompression area is the first buffer flow channel 02-1 opened on the valve seat 02, and a flow channel small hole 02-3 is opened at the lower end of the valve seat 02; the valve core 03 includes a first valve core 03-1 and a second valve core 03-2. The third decompression area includes the second buffer flow channel 02-2 on the valve seat 02 arranged between the first valve core 03-1 and the second valve core 03-2; the fourth decompression area includes a labyrinth structure of multiple small holes and flow channels arranged on the valve cage.

[0046] The technical solution of the present application sets four decompression areas. In the first decompression area, by calculating the size of the flow rate, the inlet flow channel 01-1 is appropriately narrowed to play a throttling role to a certain extent; when the medium enters the buffer inner cavity arranged on the valve body assembly 01, an effective buffering effect can be achieved; in the second decompression area, appropriate flow channel small holes 02-3 are opened at the lower end of the valve seat 02, and the medium enters the secondary throttling decompression area through the flow channel small holes 02-3 for mixed flow, making the flow direction of the medium more uniform and reducing the phenomenon of eccentric wear of the integrated valve core valve stem 03, and playing a decompression role again; in the third decompression area, the size of the flow rate is adjusted by the distance between the head of the first valve core 03-1 and the head of the second valve core 03-2. The valve seat 02 is provided with a second buffer flow channel 02-2, and the medium is throttled and decompressed again when passing through the sealing surface between the integrated valve core valve stem 03 and the valve seat 02; in the fourth decompression area, by opening multiple small holes and flow channels on the valve cage, it is not easy to generate an instantaneous explosive force from high pressure to low pressure when the medium passes through the sealing surface of the valve seat 02 and the integrated valve core valve stem 03, thereby effectively protecting the seal and extending the service life.

[0047] The inlet flow channel 01-1 appropriately reduces the diameter of the through-hole by calculating the size of the flow rate, and the buffer inner cavity is as large as possible, so that the medium entering the buffer cavity effectively plays a role in releasing energy.

[0048] The inlet position of the inlet flow channel 01-1 of the present application is inclined downward. Because the valve is used with a large pressure difference and a high flow rate of the medium, the first flushing point of the medium is placed on the shell that does not have a sealing function. The valve body adopts specially designed forgings, which is 1 / 3 larger than the valve body of an ordinary valve of the same specification. The shell wall thickness is thickened and the valve cavity volume is increased to ensure that the buffer area meets the requirements of use.

[0049] In this application, the valve core and the valve stem are processed with an integral material, the strength of the valve core is better, and the guidance is more stable and reliable. The valve stem adopts a body modification processing technology, and the surface finish of the valve stem can reach Ra≤0.08μm. At the same time, the surface hardness is increased by 20%-45%, which is not easy to wear, and there is little resistance when the valve stem moves up and down; the valve core, valve body, valve seat, and stuffing box are all on the same center point, so that the valve core will not get stuck during the adjustment process, and the sealing performance is better and the service life is longer.

[0050] Example 2

[0051] Based on Example 1, refer to Figures 1-6 The bolt assembly of this embodiment includes bolt holes arranged on the valve body assembly 01 and the valve cover 05, and bolts that are locked in cooperation with the bolt holes are connected in the bolt holes, and nuts 06 are connected to the bolts.

[0052] The present application connects the valve body assembly 01 and the valve cover by a bolt assembly, which can not only improve the fixing effect between the two, but also facilitate the disassembly and installation of the valve body assembly 01 and the valve cover 05 when the entire structure needs to be repaired.

[0053] Example 3

[0054] Based on Example 1, refer to Figures 1-6 In this embodiment, the flow channel small hole 02-3 is not provided in the 1 / 4 circle facing the first buffer flow channel 02-1.

[0055] In the present application, a small hole that meets the flow rate is set at the lower end of the buffer area at the lower end of the valve seat 02, and no small hole is drilled at the end facing the inlet (1 / 4 circle) to prevent the medium from directly eroding the head of the integrated valve core valve stem 03. The buffer area is lengthened to achieve the effect of allowing the medium to pass smoothly through the head of the first valve core 03-1.

[0056] Example 4

[0057] Based on Example 1, refer to Figures 1-6 , the flow area of ​​the inlet buffer cavity 01 - 2 of this embodiment is greater than 3 times that of the inlet flow channel 01 - 1.

[0058] The present application makes the flow area of ​​the buffer cavity more than three times that of the inlet flow channel 01-1, so that when the medium enters this area, it can effectively play a buffering role.

[0059] Example 5

[0060] Based on Example 1, referring to Figures 1-6 , the valve seat 02 of this embodiment is an independent valve seat 02.

[0061] In this application, the valve seat 02 is set as an independent valve seat 02, which is convenient to disassemble and simple to maintain; moreover, the valve seat 02 adopts a two-stage pressure reduction structure: in the first stage, a very large buffer area is provided at the lowermost end of the valve seat 02, and there are small holes that meet the flow rate at the lower end of the buffer area at the lower end of the valve seat 02. No small holes are drilled at the end (1 / 4 circle) facing the inlet to prevent the medium from directly flushing the head of the valve core. The buffer area is lengthened to allow the medium to pass through the head of the first valve core 03-1 smoothly; in the second stage, a double valve core structure is adopted. The heads of the double valve cores can effectively slow down the flow rate of the medium, and a buffer area is provided between the head of the first valve core 03-1 and the head of the second valve core 03-2, which plays an effective role in reducing speed and pressure again, making the flow direction and speed of the medium pass through the valve sealing surface more smoothly and reducing the damage to the sealing surface.

[0062] Example 6

[0063] Based on Example 1, referring to Figures 1-6 , the valve cage 04 of this embodiment is on the same central dot as the valve seat 02, the integral valve core valve stem 03, the valve body assembly 01, and the valve cover 05.

[0064] In this application, the valve cage, the valve seat 02, the integral valve core valve stem 03, the valve body assembly 01, and the valve cover 05 are all set on the same central dot, ensuring the overall concentricity and the smoothness of the valve core during movement.

[0065] In this application, the valve core and the valve stem are processed from a whole material. The valve core has better strength and more stable and reliable guidance. The valve stem part adopts a body modification processing technology. The surface finish of the valve stem can reach Ra≤0.08μm, and at the same time, the surface hardness is increased by 20% - 45%, making it not easy to wear and having small resistance when moving the valve stem up and down; the valve core, valve body, valve seat, and stuffing box are all on the same central dot, so that the valve core will not get stuck during the adjustment process, and has better sealing performance and longer service life.

[0066] Example 7

[0067] Based on Example 1, referring to Figures 1-6 , the seal of the valve body assembly 01 of this embodiment adopts a laminated metal wound seal.

[0068] The valve body seal in this application adopts a laminated metal wound seal, which has a simple structure, good sealing effect, and is convenient for disassembly and inspection.

[0069] Example 8

[0070] Based on Example 1, referring to Figures 1-6, multiple layers of small holes 04-1 and flow channels are provided on the valve cage 04 of this embodiment.

[0071] In this application, by providing multiple layers of small holes 04-1 and flow channels on the valve cage 04 in the fourth pressure reduction area, it is not easy to cause the generation of instantaneous explosive force from high pressure to low pressure when the medium passes through the valve seat and the sealing surface of the valve core, thereby effectively achieving the effect of protecting the sealing surfaces of the valve core and the valve seat.

[0072] The above-described embodiments only represent the specific implementation manners of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the protection scope of this application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the technical solution of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application.

Claims

1. A four-stage step-down regulating valve, comprising a valve body assembly (01), the valve body assembly (01) including a valve seat (02), an integrated valve core and valve stem (03), and a valve cage (04), wherein the upper end of the valve body assembly (01) is connected to a valve cover (05) through a bolt assembly, characterized in that, An inlet flow channel (01-1), an inlet buffer inner cavity (01-2), an outlet buffer inner cavity (01-3), and an outlet flow channel (01-4) are provided inside the valve body assembly (01). The first pressure reduction area is the inlet buffer inner cavity (01-2); the second pressure reduction area is the first buffer flow channel (02-1) provided on the valve seat (02). No flow channel small holes (02-3) are provided in a 1 / 4 circle of the lower end of the valve seat (02) facing the inlet flow channel (01-1), and flow channel small holes (02-3) are provided in the other 3 / 4 circle; the valve core of the integrated valve core valve stem (03) includes a first valve core (03-1) and a second valve core (03-2). The third pressure reduction area includes a second buffer flow channel (02-2) provided on the valve seat (02) between the first valve core (03-1) and the second valve core (03-2); the fourth pressure reduction area includes a labyrinth structure of multiple small holes and flow channels provided on the valve cage (04); the valve cage (04), the valve seat (02), the integrated valve core valve stem (03), the valve body assembly (01), and the valve cover (05) are all on the same central dot; The flow area of the inlet buffer inner cavity (01-2) is more than 3 times that of the inlet flow channel (01-1).

2. The four-stage step-down regulating valve according to claim 1, characterized in that The bolt assembly includes bolt holes provided on the valve body assembly (01) and the valve cover (05). Bolts that are matched and locked with the bolt holes are connected in the bolt holes, and nuts (06) are connected to the bolts.

3. The four - stage step - down regulating valve according to claim 1, wherein, The valve seat (02) is an independent valve seat (02).

4. The four-stage step-down regulating valve according to claim 1, characterized in that, The seal of the valve body assembly (01) adopts a laminated metal wound seal.

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