Step-by-step pressure reduction winding type noise reduction valve

Abstract

The invention discloses a step-by-step pressure reduction winding type noise reduction valve, and relates to the technical field of noise reduction valves. A step-by-step pressure reduction winding type noise reduction valve comprises a valve body, a valve cover installed on the valve body and an execution piece installed on the valve cover, the valve body is provided with a fluid inlet, a fluid passing channel and a fluid outlet which are communicated, a valve seat and a valve element are arranged in the fluid passing channel, the valve seat is installed on the valve body, the valve element is connected with the execution piece, and the valve element is connected with the execution piece. The execution piece is configured to drive the valve element to move in a reciprocating mode so as to leave / make contact with the valve seat to open / close the flowing channel, and the valve seat is provided with a pressure reduction mechanism. The pressure reducing mechanism comprises a plurality of pressure reducing pieces installed on the valve seat, and the pressure reducing pieces are sequentially arranged in the fluid flowing direction. Each pressure reducing piece comprises a plurality of pressure reducing holes penetrating through the wall face, and the number and / or the hole diameter of the pressure reducing holes in different pressure reducing pieces are different, so that step-by-step pressure reduction of fluid is achieved. According to the invention, fluid flow is stable, so that noise is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of noise reduction valves, and in particular to a step-by-step pressure reducing winding type noise reduction valve. Background Art

[0002] In the field of industrial production, valves, as key components for controlling the flow of fluid media, are widely used in many industries such as petroleum, chemical industry, electric power, and metallurgy. With the continuous expansion of industrial production scale and the increasing requirements of people for working environment and quality of life, the noise problem generated by valves during operation has gradually attracted attention. When traditional valves control the flow of fluids, they will generate large noise due to factors such as turbulent flow rate and drastic pressure changes. These noises will not only damage the hearing of operators, but also easily cause tinnitus, hearing loss and other problems if they are in a high-decibel noise environment for a long time. It will also interfere with the communication and monitoring systems at the production site, affecting the normal production, and even causing noise pollution to the surrounding environment, which does not meet environmental protection requirements. Summary of the invention

[0003] In order to stabilize the fluid flow and thus reduce noise, the present application provides a step-by-step pressure reducing winding type noise reduction valve.

[0004] The present application provides a step-by-step pressure reducing winding type noise reduction valve adopts the following technical solution: A step-by-step pressure reducing winding type noise reducing valve, comprising a valve body, a valve cover mounted on the valve body and an actuator mounted on the valve cover, the valve body having a fluid inlet, a flow channel and a fluid outlet connected to each other, a valve seat and a valve core are arranged in the flow channel, the valve seat is mounted on the valve body, the valve core is connected to the actuator, the actuator is configured to be able to drive the valve core to reciprocate so as to leave / contact the valve seat to open / close the flow channel, and the valve seat is installed with a pressure reducing mechanism; The pressure reducing mechanism comprises a plurality of pressure reducing parts installed on the valve seat, and the plurality of pressure reducing parts are arranged in sequence along the flow direction of the fluid; each of the pressure reducing parts comprises a plurality of pressure reducing holes penetrating through the wall surface, and the number and / or aperture of the pressure reducing holes on different pressure reducing parts are different, so as to realize step-by-step pressure reduction of the fluid.

[0005] By adopting the above technical solution, after the actuator drives the valve core to move away from the valve seat, the fluid can enter from the fluid inlet and flow out from the fluid outlet through the flow channel, and the pressure reducing mechanism will reduce the noise of the flowing fluid. Specifically, when the fluid flows through multiple pressure reducing parts, the multiple pressure reducing parts will gradually reduce the pressure of the fluid to ensure the stability of the speed and pressure of the fluid flow, reduce the occurrence of turbulence and pressure pulsation, and reduce the generation of noise from the source.

[0006] Preferably, each of the pressure reducing components comprises a pressure reducing mother component which is annularly installed on the valve seat, a plurality of through installation grooves are opened on the inner wall of the pressure reducing mother component, and the plurality of installation grooves are evenly arranged along the axis of the pressure reducing mother component, and a pressure reducing sub-component is installed in each of the installation grooves, and the fluid will flow through the pressure reducing mother component and the pressure reducing sub-component, and the pressure reducing sub-component and the installation groove are detachably connected.

[0007] By adopting the above technical solution, the fluid will be decompressed when flowing through the decompression mother component and the decompression sub-component. By replacing the decompression sub-component, the total number of decompression holes or the aperture of the decompression holes can be adjusted. Based on the adjustment of the number and aperture of the decompression holes, the amplitude of decompression can be changed to meet different application scenarios.

[0008] Preferably, multiple groups of the pressure reducing holes are formed at either end of the pressure reducing mother component, the multiple groups of pressure reducing holes are evenly arranged around the axis of the pressure reducing mother component, the pressure reducing holes in the same group are distributed in an array, and each of the pressure reducing holes penetrates into the installation groove.

[0009] Preferably, the decompression sub-component includes a decompression top plate, a noise reduction inner plate and a decompression bottom plate which are connected in sequence, a plurality of decompression holes are respectively formed in an array on the decompression top plate and the decompression bottom plate, the noise reduction inner plate includes a plurality of honeycomb through holes arranged in an array on the wall surface, and the noise reduction inner plate is made of sound-absorbing material.

[0010] By adopting the above technical solution, the fluid will flow through the pressure reducing top plate, the noise reducing inner plate and the pressure reducing bottom plate, wherein the pressure reducing top plate and the pressure reducing bottom plate are mainly used for fluid pressure reducing, while the noise reducing inner plate, i.e., the multiple honeycomb through holes provided therein, are mainly used for fluid noise reduction.

[0011] Preferably, the connection between the pressure reducing top plate and the noise reducing inner plate and the connection between the noise reducing inner plate and the pressure reducing bottom plate both have smooth transition portions.

[0012] By adopting the above technical solution, when the fluid contacts a sharp boundary, the fluid will separate at the boundary layer, and the flow of the fluid is easily changed from a relatively regular state to a more disordered turbulent state, which will increase noise; in the present application, since the connection is relatively smooth, the pressure can be relatively stable when the fluid flows, and the fluid can flow smoothly along the wall, reducing the possibility of boundary layer separation.

[0013] Preferably, the valve body has a cylinder for cooperating with the valve core, and the valve core is installed with a plurality of sealing members, and the plurality of sealing members are all installed at the cooperating position between the valve core and the valve body.

[0014] By adopting the above technical solution, the setting of the sealing member can prevent the fluid from flowing at a high speed in the gap and generating noise.

[0015] Preferably, the valve core divides the flow channel into chamber one and chamber two, and a balancing hole for connecting chamber one and chamber two is opened on the valve core.

[0016] By adopting the above technical solution, based on the balance hole, the fluid enters from the fluid inlet and subsequently reaches chamber one and chamber two. This structure can ensure the pressure balance on both sides of the valve core, and can also ensure that the valve core can be buffered by the liquid when moving, thereby avoiding high-speed impact of the valve core.

[0017] Preferably, the valve seat includes a step portion formed in the flow channel, the step portion is used to contact the valve core, and a buffer pad is installed on the step portion.

[0018] By adopting the above technical solution, the buffer pad can buffer the action of the valve core contacting the step portion to reduce the generation of noise.

[0019] Preferably, the actuator comprises a valve stem, a mounting hole is formed on the valve core, the valve stem is threadedly connected to the mounting hole, and a detachable pin is also commonly connected between the valve stem and the valve core.

[0020] By adopting the above technical solution, the valve core can be disassembled to refurbish the valve core.

[0021] Preferably, the valve cover has a first connecting hole, the valve body has a second connecting hole, and the first connecting hole and the second connecting hole are commonly connected with a screw.

[0022] In summary, the present invention includes at least one of the following beneficial technical effects: 1. After the actuator drives the valve core to move away from the valve seat, the fluid can enter from the fluid inlet and flow out from the fluid outlet through the flow channel, and the pressure reducing mechanism will reduce the noise of the flowing fluid. Specifically, when the fluid flows through multiple pressure reducing parts, the multiple pressure reducing parts will gradually reduce the pressure of the fluid to ensure the stability of the speed and pressure of the fluid flow, reduce turbulence and pressure pulsation, and reduce the generation of noise from the source; 2. When the fluid flows, it will pass through the pressure reducing mother component and the pressure reducing sub-component to be decompressed. By replacing the pressure reducing sub-component, the total number of pressure reducing holes or the aperture of the pressure reducing holes can be adjusted. Based on the adjustment of the number and aperture of the pressure reducing holes, the amplitude of pressure reducing can be changed to meet different application scenarios; in addition, the specific fluid will flow through the pressure reducing top plate, the noise reducing inner plate and the pressure reducing bottom plate, among which the pressure reducing top plate and the pressure reducing bottom plate are mainly used for fluid pressure reducing, and the noise reducing inner plate, that is, the multiple honeycomb through holes set therein, are mainly used for fluid noise reduction; 3. Based on the balance hole, the fluid enters from the fluid inlet and then reaches chamber 1 and chamber 2. This structure can ensure the pressure balance on both sides of the valve core, and can also ensure that the valve core can be buffered by the liquid when it moves, thereby avoiding high-speed impact of the valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a cross-sectional view of a step-by-step pressure reducing winding type noise reduction valve in an embodiment of the present application; Figure 2 It is a structural schematic diagram of the pressure reducing mechanism; Figure 3 It is a cross-sectional view used to reflect the decompression sub-component; Figure 4 It is used to reflect the schematic diagram of the structure of the decompression sub-component; Figure 5 yes Figure 1 Enlarged view of part A.

[0024] Markings in the accompanying drawings: 1. valve body; 11. fluid inlet; 12. flow channel; 121. chamber one; 122. chamber two; 13. fluid outlet; 14. second connecting hole; 15. cylinder; 16. sealing member; 2. valve cover; 21. first connecting hole; 3. actuator; 31. actuator body; 32. valve stem; 4. valve seat; 41. step portion; 42. buffer pad; 43. throttle plate; 431. liquid flow hole; 5. valve core; 51. mounting hole; 52. pin; 53. balancing hole; 6. pressure reducing mechanism; 61. pressure reducing member; 611. pressure reducing mother member; 6111. mounting groove; 612. pressure reducing sub-member; 6121. pressure reducing top plate; 6122. noise reducing inner plate; 61221. honeycomb through hole; 6123. pressure reducing bottom plate; 6124. smooth transition portion; 62. pressure reducing hole. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0027] The embodiment of the present application discloses a step-by-step pressure reducing winding type noise reduction valve.

[0028] Reference Figure 1The step-by-step pressure reducing winding noise reduction valve includes a valve body 1, a valve cover 2 installed on the valve body 1, and an actuator 3 installed on the valve cover 2. The specific structure of the actuator 3 is the prior art and is not described here. The valve body 1 has a fluid inlet 11, a flow channel 12 and a fluid outlet 13 connected from left to right. A valve seat 4 and a valve core 5 are provided in the flow channel 12. The valve seat 4 is installed on the valve body 1, and the valve core 5 is connected to the actuator 3. The actuator 3 can drive the valve core 5 to move up and down so as to leave / contact the valve seat 4 to open / close the flow channel 12. Specifically, the valve cover 2 has a first connecting hole 21, the valve body 1 has a second connecting hole 14, the first connecting hole 21 and the second connecting hole 14 are commonly connected with a screw, so the valve cover 2 can be disassembled; the actuator 3 includes an actuator body 31 installed on the valve cover 2, the actuator body 31 is connected with a valve stem 32, the valve stem 32 is slidably connected to the valve cover 2, a mounting hole 51 is opened on the valve core 5, the valve stem 32 is threadedly connected to the mounting hole 51, and a detachable pin 52 is also commonly connected between the valve stem 32 and the valve core 5, so the valve core 5 can be disassembled and separated from the valve stem 32.

[0029] Reference Figure 1 In order to ensure the stability of fluid flow and reduce noise, the valve seat 4 is equipped with a pressure relief mechanism 6; the pressure relief mechanism 6 includes a plurality of pressure relief members 61 installed on the valve seat 4, and the plurality of pressure relief members 61 are arranged in sequence along the fluid flow direction. In this embodiment, the number of the pressure relief members 61 is four, and the four pressure relief members 61 are vertically stacked; refer to Figure 2 and Figure 3 Each pressure reducing member 61 includes a plurality of pressure reducing holes 62 penetrating the wall surface, but the number and / or aperture of the pressure reducing holes 62 on different pressure reducing members 61 are different, so as to realize step-by-step pressure reduction of the fluid.

[0030] After the actuator 3 is driven to drive the valve core 5 to move upward and leave the valve seat 4, the fluid entering from the fluid inlet 11 flows out from the fluid outlet 13 through the flow channel 12, and the pressure reducing mechanism 6 will reduce the noise of the flowing fluid. Specifically, when the fluid flows through multiple pressure reducing components 61, the multiple pressure reducing components 61 will gradually reduce the pressure of the fluid to ensure the stability of the speed and pressure of the fluid flow, reduce the occurrence of turbulence and pressure pulsation, and thus reduce the generation of noise at the source.

[0031] Specifically, in this embodiment, the number of the pressure reducing holes 62 of the pressure reducing member 61 arranged from top to bottom gradually decreases, and the apertures of the pressure reducing holes 62 also gradually become smaller, so that the fluid will be gradually decompressed after flowing.

[0032] It should be noted that: the number and aperture of the pressure reducing holes 62 directly determine the resistance of the fluid when passing through; when the aperture of the pressure reducing holes 62 is small and the number is small, the throttling effect on the fluid when passing through is stronger, and the pressure drop is greater; with the cooperation of the multi-stage pressure reducing parts 61, it is possible to achieve a significant reduction in the fluid pressure; on the contrary, the pressure reducing holes 62 with larger apertures and more numbers have a relatively weak throttling effect on the fluid, and the pressure drop is smaller. Therefore, by reasonably designing the number and aperture changes of the pressure reducing holes 62 on adjacent pressure reducing parts 61, it is possible to achieve precise control of the fluid pressure, ensure that each stage of pressure reducing can achieve the expected effect, and meet the requirements for fluid pressure under different working conditions.

[0033] Reference Figure 1 and Figure 2 , taking one of the pressure reducing components 61 structures as an example: the pressure reducing component 61 includes a ring-shaped pressure reducing mother component 611 installed on the valve seat 4, the pressure reducing mother component 611 and the valve seat 4 are connected by screws, and a plurality of through mounting grooves 6111 are provided on the inner wall of the pressure reducing mother component 611. In the present embodiment, the number of the mounting grooves 6111 is four, and the plurality of mounting grooves 6111 are evenly arranged along the axis of the pressure reducing mother component 611, and each mounting groove 6111 is installed with a pressure reducing sub-component 612, and the fluid will flow through the pressure reducing mother component 611 and the pressure reducing sub-component 612, and the pressure reducing sub-component 612 and the mounting groove 6111 are detachably connected, specifically, the pressure reducing sub-component 612 is inserted into the mounting groove 6111, and the pressure reducing sub-component 612 and the mounting groove 6111 are connected by screws.

[0034] Reference Figure 2 and Figure 3 A plurality of pressure reducing holes 62 are formed at either end of the pressure reducing mother component 611. In the present embodiment, there are four groups of pressure reducing holes 62. The four groups of pressure reducing holes 62 are evenly arranged around the axis of the pressure reducing mother component 611. The pressure reducing holes 62 in the same group are distributed in an array, and each pressure reducing hole 62 penetrates into the mounting groove 6111.

[0035] Reference Figure 3 and Figure 4 The decompression sub-component 612 includes a decompression top plate 6121, a noise reduction inner plate 6122 and a decompression bottom plate 6123 which are sequentially connected from top to bottom. A plurality of decompression holes 62 are respectively formed in an array on the decompression top plate 6121 and the decompression bottom plate 6123. The noise reduction inner plate 6122 includes a plurality of honeycomb through holes 61221 arranged in an array on the wall surface. The noise reduction inner plate 6122 is made of sound-absorbing material. The materials of the noise reduction inner plate 6122 include synthetic fibers, glass wool and melamine foam.

[0036] The fluid will flow from the top of the decompression mother component 611 into the mounting groove 6111 and pass through the decompression top plate 6121, the noise reduction inner plate 6122 and the decompression bottom plate 6123 and flow out at the bottom of the decompression mother component 611, wherein the decompression mother component 611, the decompression top plate 6121 and the decompression bottom plate 6123 are mainly used for fluid decompression, and the noise reduction inner plate 6122 is mainly used for fluid noise reduction.

[0037] For high-pressure, high-flow fluids, larger apertures and a larger number of pressure-reducing holes 62 are required to ensure sufficient flow through, while avoiding excessive pressure drop due to excessive throttling, which affects the normal operation of the system. For low-pressure, low-flow fluids, smaller apertures and a smaller number of pressure-reducing holes 62 can be used to achieve fine pressure reduction control. In the present application, the pressure-reducing sub-component 612 can be disassembled to replace other types of pressure-reducing sub-components 612. Here, other types refer to pressure-reducing sub-components 612 with different apertures and numbers of pressure-reducing holes 62. Of course, the pressure-reducing mother component 611 can also be disassembled and replaced when necessary. The flexibility of the number and aperture of the pressure-reducing holes 62 on this single pressure-reducing component 61 makes it easy for the valve to be adjusted to adapt to various complex industrial production scenarios, improving the versatility and practicality of the present application.

[0038] Reference Figure 4 , because when the fluid contacts the sharp boundary, the fluid will separate in the boundary layer, and the flow of the fluid is easy to change from a relatively regular state to a more chaotic turbulent state. When the fluid passes through these areas, the pressure will change sharply and cause pressure pulsation, which will increase the noise. Therefore, in order to further avoid the generation of noise, the connection between the pressure reduction top plate 6121 and the noise reduction inner plate 6122 and the connection between the noise reduction inner plate 6122 and the pressure reduction bottom plate 6123 are both provided with a smooth transition portion 6124. In the present application, since the connection is relatively smooth, the pressure can be relatively stable when the fluid flows, and the fluid can flow smoothly along the wall, reducing the possibility of boundary layer separation.

[0039] Reference Figure 5 The valve body 1 has a cylinder 15 for cooperating with the valve core 5. The valve core 5 is equipped with a plurality of seals 16, such as sealing pads, sealing rings, etc. The plurality of seals 16 are all installed at the cooperating position of the valve core 5 and the valve body 1. When the valve core 5 moves, the plurality of seals 16 can prevent the fluid from flowing through the gap between the valve core 5 and the valve body 1. This design is also used to prevent the fluid from being in a turbulent state.

[0040] Reference Figure 5 Combined with Figure 1, the valve core 5 divides the flow channel 12 into chamber 1 121 and chamber 2 122, and a balance hole 53 is opened on the valve core 5 for connecting chamber 1 121 and chamber 2 122. Based on the balance hole 53, the fluid will exist in chamber 1 121 and chamber 2 122 at the same time. This structure can ensure the pressure balance on both sides of the valve core 5, and can also ensure that the valve core 5 can be buffered by the liquid when moving, thereby preventing the valve core 5 from hitting the valve body 1 at high speed. In order to prevent the large flow of fluid from impacting the bottom of the valve body 1 when flowing from top to bottom in the flow channel 12, the valve seat 4 includes a throttle plate 43 at the bottom end, and the throttle plate 43 has a plurality of through-flowing liquid holes 431. The plurality of liquid holes 431 can play a throttling role to mitigate the impact.

[0041] Reference Figure 5 In order to avoid noise when the valve core 5 contacts the valve seat 4, the valve seat 4 includes a step portion 41 formed in the flow channel 12, the step portion 41 is used to contact the valve core 5, and a buffer pad 42 is installed on the step portion 41. The material of the buffer pad 42 is rubber, for example.

[0042] The implementation principle of the step-by-step pressure reducing winding noise reduction valve in the embodiment of the present application is: The driving actuator 3 drives the valve core 5 to move upward and away from the valve seat 4. The fluid entering from the fluid inlet 11 flows out from the fluid outlet 13 through the flow channel 12. The fluid will flow through multiple pressure reducing components 61. The multiple pressure reducing components 61 will gradually reduce the pressure of the fluid to ensure the stability of the speed and pressure of the fluid during flow.

[0043] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A step-by-step pressure reducing winding type noise reduction valve, characterized in that: The invention comprises a valve body (1), a valve cover (2) mounted on the valve body (1), and an actuator (3) mounted on the valve cover (2); the valve body (1) has a fluid inlet (11), a flow channel (12), and a fluid outlet (13) which are connected to each other; a valve seat (4) and a valve core (5) are arranged in the flow channel (12); the valve seat (4) is mounted on the valve body (1); the valve core (5) is connected to the actuator (3); the actuator (3) is configured to be able to drive the valve core (5) to move back and forth so as to leave / contact the valve seat (4) to open / close the flow channel (12); and the valve seat (4) is installed with a pressure reducing mechanism (6); The pressure reducing mechanism (6) comprises a plurality of pressure reducing members (61) mounted on the valve seat (4), wherein the plurality of pressure reducing members (61) are arranged in sequence along the flow direction of the fluid; each of the pressure reducing members (61) comprises a plurality of pressure reducing holes (62) penetrating the wall surface, and the number and / or aperture of the pressure reducing holes (62) on different pressure reducing members (61) are different, so as to achieve step-by-step pressure reduction of the fluid.

2. The step-by-step pressure reducing winding type noise reduction valve according to claim 1 is characterized in that: Each of the pressure reducing components (61) comprises a pressure reducing mother component (611) which is annularly mounted on the valve seat (4); a plurality of through mounting grooves (6111) are formed on the inner wall of the pressure reducing mother component (611); the plurality of mounting grooves (6111) are evenly arranged along the axis of the pressure reducing mother component (611); a pressure reducing sub-component (612) is mounted in each of the mounting grooves (6111); a fluid flows through the pressure reducing mother component (611) and the pressure reducing sub-component (612); and the pressure reducing sub-component (612) and the mounting groove (6111) are detachably connected.

3. The step-by-step pressure reducing winding type noise reduction valve according to claim 2 is characterized in that: A plurality of the pressure reducing holes (62) are formed in a plurality of groups at either end of the pressure reducing mother component (611), and the plurality of groups of pressure reducing holes (62) are evenly arranged around the axis of the pressure reducing mother component (611), and the pressure reducing holes (62) in the same group are distributed in an array, and each of the pressure reducing holes (62) penetrates into the mounting groove (6111).

4. The step-by-step pressure reducing winding type noise reduction valve according to claim 2 is characterized in that: The decompression sub-component (612) comprises a decompression top plate (6121), a noise reduction inner plate (6122) and a decompression bottom plate (6123) which are connected in sequence; a plurality of decompression holes (62) are respectively formed in an array on the decompression top plate (6121) and the decompression bottom plate (6123); the noise reduction inner plate (6122) comprises a plurality of honeycomb through holes (61221) arranged in an array on the wall surface; and the noise reduction inner plate (6122) is made of sound-absorbing material.

5. The step-by-step pressure reducing winding type noise reduction valve according to claim 4 is characterized in that: The connection between the pressure-reducing top plate (6121) and the noise-reducing inner plate (6122) and the connection between the noise-reducing inner plate (6122) and the pressure-reducing bottom plate (6123) both have a smooth transition portion (6124).

6. The step-by-step pressure reducing winding type noise reduction valve according to claim 1 is characterized in that: The valve body (1) has a cylinder (15) for cooperating with a valve core (5); the valve core (5) is provided with a plurality of sealing members (16); and the plurality of sealing members (16) are all installed at the cooperating position between the valve core (5) and the valve body (1).

7. The step-by-step pressure reducing winding type noise reduction valve according to claim 6 is characterized in that: The valve core (5) divides the flow channel (12) into chamber one (121) and chamber two (122), and a balancing hole (53) for connecting chamber one (121) and chamber two (122) is formed on the valve core (5).

8. The step-by-step pressure reducing winding type noise reduction valve according to claim 1 is characterized in that: The valve seat (4) comprises a step portion (41) formed in the flow channel (12), the step portion (41) being used to contact the valve core (5), and a buffer pad (42) being installed on the step portion (41).

9. The step-by-step pressure reducing winding type noise reduction valve according to claim 1, characterized in that: The actuator (3) comprises a valve stem (32), a mounting hole (51) is formed on the valve core (5), the valve stem (32) is threadedly connected to the mounting hole (51), and a detachable pin (52) is also commonly connected between the valve stem (32) and the valve core (5).

10. The step-by-step pressure reducing winding type noise reduction valve according to claim 1, characterized in that: The valve cover (2) has a first connecting hole (21), the valve body (1) has a second connecting hole (14), and the first connecting hole (21) and the second connecting hole (14) are connected together by a screw.

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