Pipe force axial flow slow closing automatic control valve

Abstract

The present invention discloses a pipe-force type axial flow slow-closing automatic control valve, and includes: a valve body, the valve body having an inlet and an outlet; a valve core assembly, the valve core assembly including a first valve flap, a second valve flap and a piston cylinder, the piston cylinder is fixedly installed in the valve body, the first valve flap and the second valve flap, the second valve flap and the piston cylinder are all movably connected along the inlet direction, a piston connected to the second valve flap is provided in the piston cylinder, and the piston divides the interior of the piston cylinder into a first sub-chamber and a second sub-chamber; the first valve flap is suitable for pressing against the inlet and is provided with a first drain hole, the second valve flap is suitable for pressing against the first drain hole and is provided with a second drain hole connected to the first drain hole, the first drain hole is connected to the first sub-chamber of the piston cylinder, and the second sub-chamber of the piston cylinder is connected to an adjustment structure. The pipe-force type axial flow slow-closing automatic control valve of the present invention can realize the slow closing of the valve body, play the role of medium backflow prevention, eliminate water hammer, and protect the water pump, motor, and pipeline.

Description

Technical Field

[0001] The present invention relates to the technical field of control valves, in particular to a pipe-force type axial flow slow-closing automatic control valve. Background Art

[0002] In related technologies, control valves are used to control the flow status of pipelines or interfaces. However, existing control valves close immediately in a short time after the liquid stops flowing. The valve closes quickly, which can easily cause water hammer impact, etc., resulting in low safety and reliability, and there is room for improvement. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a pipe-force axial flow slow-closing automatic control valve that can achieve slow closing of the valve body, serve as a medium check valve, eliminate water hammer, and protect the water pump, motor, and pipeline.

[0004] According to an embodiment of the present invention, a tube-force axial flow slow-closing automatic control valve includes: a valve body, the valve body having an inlet and an outlet; a valve core assembly, the valve core assembly including a first valve flap, a second valve flap and a piston cylinder distributed in sequence in the inlet direction from the inlet to the outlet, the piston cylinder being fixedly installed in the valve body, the first valve flap and the second valve flap, the second valve flap and the piston cylinder being movably connected along the inlet direction, a piston connected to the second valve flap being provided in the piston cylinder, the piston dividing the interior of the piston cylinder into a first sub-chamber and a second sub-chamber; the first valve flap being suitable for pressing against the inlet and being provided with a first drain hole, the second valve flap being suitable for pressing against the first drain hole and being provided with a second drain hole connected to the first drain hole, the first drain hole being connected to the first sub-chamber of the piston cylinder, and the second sub-chamber of the piston cylinder being connected with an adjusting structure.

[0005] According to the embodiment of the present invention, the pipe-force axial flow slow-closing automatic control valve is used in conjunction with a valve body, a first valve flap, a second valve flap and a piston cylinder, and an adjustment structure is provided. When the fluid medium input is stopped at the corresponding pipeline or water pump interface, the valve body can be slowly closed, which plays the role of medium backflow and elimination of water hammer, thereby protecting the water pump, motor and pipeline.

[0006] According to some embodiments of the present invention, the tube-force axial flow slow-closing automatic control valve further includes a guide shaft, the axial direction of the guide shaft is along the inlet direction, and the first valve disc is sleeved on the guide shaft and slides along the axial direction of the guide shaft.

[0007] According to some embodiments of the tube-forced axial flow slow-closing automatic control valve of the present invention, the first valve flap includes a first radial sealing portion and a first axial connecting portion, the first radial sealing portion is connected to one end of the first axial connecting portion, the first radial sealing portion is provided with the first drain hole, and the first axial connecting portion is sleeved outside the guide shaft.

[0008] According to some embodiments of the tube-forced axial flow slow-closing automatic control valve of the present invention, the second valve flap includes a second radial sealing portion and a second axial connecting portion, the second radial sealing portion is connected to one end of the second axial connecting portion and the other end is connected to the piston, the second axial connecting portion is provided with the second drain hole, and the second axial connecting portion is sleeved outside a portion of the first valve flap.

[0009] According to some embodiments of the pipe-forced axial flow slow-closing automatic valve of the present invention, the outer diameter of the first valve disc is larger than the outer diameter of the second valve disc, and the inner diameter of the first drain hole is larger than the inner diameter of the second drain hole.

[0010] According to some embodiments of the tube-forced axial flow slow-closing automatic control valve of the present invention, the first valve flap includes two first sub-valve flaps suitable for splicing and slidably fitting, the second valve flap includes two second sub-valve flaps suitable for splicing and slidably fitting, and the piston includes two sub-plug bodies suitable for splicing and slidably fitting, and the two first sub-valve flaps, the two second sub-valve flaps and the two sub-plug bodies are connected one by one.

[0011] According to some embodiments of the tube-force axial flow slow-closing self-control valve of the present invention, the two sub-plug bodies are respectively located in the first side area and the second side area of ​​the piston cylinder, and one of the first side area and the second side area is provided with the adjustment structure.

[0012] According to some embodiments of the pipe-forced axial flow slow-closing automatic valve of the present invention, the regulating structure includes a regulating valve and a connecting conduit, the regulating valve is connected to the connecting conduit, and the regulating valve selectively passes the regulating medium into the second sub-chamber through the connecting conduit.

[0013] According to some embodiments of the pipe-force axial flow slow-closing automatic control valve of the present invention, there are two connecting conduits, and the two connecting conduits respectively lead into the second sub-cavity from two positions facing each other in the radial direction of the second sub-cavity.

[0014] According to some embodiments of the pipe-force axial flow slow-closing automatic control valve of the present invention, a valve seat is provided at the inlet, the valve seat is detachably connected to the valve body, and a sealing structure is provided at the position where the valve seat contacts the first valve disc.

[0015] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0017] Figure 1 2. It is a schematic diagram of the end portion of a pipe-force type axial flow slow-closing automatic control valve according to an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of a pipe-force type axial flow slow-closing automatic control valve in a closed state according to an embodiment of the present invention;

[0019] Figure 3 is a cross-sectional view of a pipe-force type axial flow slow-closing automatic control valve in a fully open state according to an embodiment of the present invention;

[0020] Figure 4 2 is a cross-sectional view of a pipe-force type axial flow slow-closing automatic control valve in a half-open state according to an embodiment of the present invention.

[0021] Reference numerals:

[0022] Pipe force axial flow slow closing automatic control valve 100,

[0023] Valve body 1, first valve body 11, inlet 111, second valve body 12, outlet 121,

[0024] Valve core assembly 2, first valve disc 21, first sub-valve disc 211, first radial blocking portion 212, first axial connecting portion 213, first drain hole 214, second valve disc 22, second sub-valve disc 221, second radial blocking portion 222, second axial connecting portion 223, second drain hole 224, piston cylinder 23, first sub-chamber 231, second sub-chamber 232, piston 24, sub-plug body 241,

[0025] Adjusting structure 3, regulating valve 31, connecting conduit 32, guide shaft 4, valve seat 5, sealing structure 51. DETAILED DESCRIPTION

[0026] Some embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0027] Reference below Figures 1-4A pipe-force axial flow slow-closing automatic control valve 100 according to an embodiment of the present invention is described. When the fluid medium at the corresponding pipeline or interface stops flowing, the pipe-force axial flow slow-closing automatic control valve 100 will not close quickly, but can be closed slowly, thereby playing the role of medium backflow and eliminating water hammer.

[0028] like Figures 1-4 As shown, the pipe-force axial flow slow-closing automatic control valve 100 according to an embodiment of the present invention includes: a valve body 1 and a valve core assembly 2.

[0029] The valve body 1 has an inlet 111 and an outlet 121. Figure 2-Figure 4 As shown, the inlet 111 and the outlet 121 are sequentially distributed in the axial direction of the valve body 1, and the inlet 111 is located at one end of the valve body 1 to allow the fluid medium to enter, and the outlet 121 is located at the other end of the valve body 1 to allow the fluid medium in the valve body 1 to flow out. It should be noted that the valve body 1 in the present invention can be installed on the system pipeline or at the water pump interface to achieve control of the flow state of the pipeline or interface.

[0030] The valve core assembly 2 is installed in the valve body 1. The valve core assembly 2 includes a first valve flap 21, a second valve flap 22 and a piston cylinder 23 which are sequentially distributed in the flow direction from the inlet 111 to the outlet 121. Figure 2-Figure 4 As shown in the figure, the first valve flap 21, the second valve flap 22 and the piston cylinder 23 are distributed from left to right in sequence, wherein the piston cylinder 23 is fixedly installed in the valve body 1, that is, the relative position of the piston cylinder 23 in the valve body 1 is fixed, and the first valve flap 21 and the second valve flap 22, and the second valve flap 22 and the piston cylinder 23 are movably connected along the inlet direction, so that the second valve flap 22 can move relative to the piston cylinder 23 along the inlet direction, such as moving toward the direction of the inlet 111 or moving away from the inlet 111. Similarly, the first valve flap 21 can move relative to the second valve flap 22 along the inlet direction, such as moving toward the direction of the inlet 111 or moving away from the inlet 111.

[0031] A piston 24 connected to the second valve disc 22 is provided in the piston cylinder 23. For example, the end of the second valve disc 22 facing away from the first valve disc 21 is fixedly connected to the end face of the piston 24, so that the second valve disc 22 can drive the piston 24 to move relative to the piston cylinder 23 and the valve body 1. The piston 24 divides the interior of the piston cylinder 23 into a first sub-chamber 231 and a second sub-chamber 232. For example, the first sub-chamber 231 is a cavity portion close to the first valve disc 21 and the second valve disc 22, and the second sub-chamber 232 is a cavity portion away from the first valve disc 21 and the second valve disc 22. Figure 2-Figure 4 As shown in FIG, the first sub-chamber 231 is located in the left part of the piston cylinder 23 , the second sub-chamber 232 is located in the right part of the piston cylinder 23 , and the piston 24 separates the first sub-chamber 231 from the second sub-chamber 232 .

[0032] The first valve flap 21 is adapted to press against the inlet 111 and is provided with a first drain hole 214, so that the first valve flap 21 can block and obstruct most of the inlet 111. The second valve flap 22 is adapted to press against the first drain hole 214 and is provided with a second drain hole 224 communicating with the first drain hole 214, so that the second valve flap 22 can block and obstruct most of the first drain hole 214. The first drain hole 214 is communicated with the first sub-chamber 231 of the piston cylinder 23. The second sub-chamber 232 of the piston cylinder 23 is connected to the adjustment structure 3. The adjustment structure 3 can adjust the pressure in the second sub-chamber 232. For example, by introducing a fluid medium into the second sub-chamber 232, the piston 24 is compressed toward the first sub-chamber 231 under the action of the fluid medium in the second sub-chamber 232, thereby driving the second valve flap 22 to move relative to the first valve flap 21 and the piston cylinder 23, thereby adjusting the position of the valve flap.

[0033] Therefore, in actual operation, if the pipe-force type axial flow slow-closing automatic control valve 100 operates normally and the fluid medium is introduced into the inlet 111, at this time, the fluid medium at the inlet 111 pushes the first valve flap 21 to move toward the piston cylinder 23, so that the inlet 111 is in an open state. At the same time, the fluid medium entering the valve body 1 enters the first drain hole 214 and pushes the second valve flap 22 to move toward the piston cylinder 23, and gradually drives the first valve flap 21 and the second valve flap 22 to be in an open state through the fluid medium pressure, thereby realizing the full opening of the pipe-force type axial flow slow-closing automatic control valve 100; further, when the water pump or system pipe connected to the pipe-force type axial flow slow-closing automatic control valve 100 is When the circuit stops running, there is no fluid medium input at the inlet 111, and the fluid medium in the valve body 1 pushes the first valve disc 21 to quickly close the inlet 111. At this time, the second valve disc 22 is not completely pressed against the first valve disc 21, and the pressure can continue to be discharged through the first discharge hole 214 of the first valve disc 21 to avoid the water hammer peak. Furthermore, the fluid medium at the outlet 121 enters the second sub-chamber 232 of the piston cylinder 23, and pushes the piston 24 to move relative to the piston cylinder 23, and drives the second valve disc 22 to move relative to the first valve disc 21, slowly closing the valve. In this way, it can play the role of medium check and eliminate water hammer, thereby protecting the water pump, motor and pipeline.

[0034] According to the embodiment of the present invention, the pipe-force axial flow slow-closing automatic control valve 100 is used in conjunction with the valve body 1, the first valve flap 21, the second valve flap 22 and the piston cylinder 23, and an adjustment structure 3 is provided. When the fluid medium input is stopped at the corresponding pipeline or water pump interface, the valve body 1 can be slowly closed, which plays the role of medium backflow and elimination of water hammer, thereby protecting the water pump, motor and pipeline.

[0035] In some embodiments, the pipe-force axial flow slow-closing automatic control valve 100 further includes a guide shaft 4, the axial direction of the guide shaft 4 is along the inlet direction, and the first valve disc 21 is sleeved on the guide shaft 4 and slides along the axial direction of the guide shaft 4, such as Figures 1-4 As shown, the guide shaft 4 is installed in the middle position of the valve body 1, and the guide shaft 4 can be fixed relative to the valve body 1.

[0036] In this way, when fluid medium is introduced into the inlet 111, the fluid medium can push the first valve flap 21 to slide along the guide shaft 4 toward the piston cylinder 23, thereby causing the first valve flap 21 to open the inlet 111. When the fluid medium is stopped from entering the inlet 111, the fluid medium pushes the first valve flap 21 to move along the guide shaft away from the piston cylinder 23, thereby causing the first valve flap 21 to approach the inlet 111 and gradually close the inlet 111. Therefore, by providing the guide shaft 4, it is helpful to ensure that the first valve flap 21 slides stably within the valve body 1, thereby achieving accurate opening or closing of the inlet 111.

[0037] In some embodiments, the first valve flap 21 includes a first radial blocking portion 212 and a first axial connecting portion 213, wherein Figure 2-Figure 4 As shown, the first radial sealing portion 212 is constructed in a plate shape, and the first axial connecting portion 213 is constructed in a tubular shape. The first radial sealing portion 212 is connected to one end of the first axial connecting portion 213, and the two are integrally formed. At the same time, the first radial sealing portion 212 is provided with a first drain hole 214, and the first axial connecting portion 213 is sleeved on the outside of the guide shaft 4.

[0038] Therefore, when the first axial connection portion 213 slides along the guide shaft 4 in a direction close to the inlet 111, the first radial sealing portion 212 gradually approaches the inlet 111 to close the inlet 111, and when the first axial connection portion 213 slides along the guide shaft 4 in a direction away from the inlet 111, the first radial sealing portion 212 gradually moves away from the inlet 111 to open the inlet 111.

[0039] It should be noted that the end surface area of ​​the first radial blocking portion 212 is relatively large, and the pressure of the fluid medium can push the first radial blocking portion 212 to move axially, thereby achieving selective closing or opening of the inlet 111.

[0040] In some embodiments, the second valve flap 22 includes a second radial blocking portion 222 and a second axial connecting portion 223. Figure 2-Figure 4As shown, the second radial sealing portion 222 is constructed in a plate shape, and the second axial connecting portion 223 is constructed in a tubular shape. The second radial sealing portion 222 is connected to one end of the second axial connecting portion 223, such as the two are integrally formed. At the same time, the second axial connecting portion 223 is provided with a second drain hole 224, and the second axial connecting portion 223 is sleeved outside a portion of the first valve disc 21, such as the second axial connecting portion 223 is sleeved outside the first axial connecting portion 213.

[0041] Thus, a sliding connection can be achieved between the first valve flap 21 and the second valve flap 22, enabling relative sliding between the two, thereby facilitating switching of the structural state of the pipe-force axial flow slow-closing automatic control valve 100. The second axial connection portion 223 is sleeved with the first axial connection portion 213, allowing the two to share a radial structural space, thereby facilitating reduction of the overall radial structural dimensions of the valve core assembly 2 and achieving a compact design.

[0042] In some embodiments, the outer diameter of the first valve flap 21 is larger than the outer diameter of the second valve flap 22. In other words, the first valve flap 21 is a large valve flap, and the second valve flap 22 is a small valve flap, and the inner diameter of the first drain hole 214 is larger than the inner diameter of the second drain hole 224. Thus, the first valve flap 21 can block a relatively large flow of medium at the inlet 111, while the second valve flap 22 can block a relatively small flow of medium at the first drain hole 214. When the corresponding pipeline stops inputting flowing medium, the first valve flap 21 and the second valve flap 22 can successively block the corresponding flow of medium, thereby slowly closing the inlet 111 and reducing water hammer.

[0043] In some embodiments, the first valve flap 21 includes two first sub-valve flaps 211 suitable for splicing and slidably fitting, the second valve flap 22 includes two second sub-valve flaps 221 suitable for splicing and slidably fitting, and the piston 24 includes two sub-plug bodies 241 suitable for splicing and slidably fitting, and the two first sub-valve flaps 211, the two second sub-valve flaps 221 and the two sub-plug bodies 241 are connected one by one.

[0044] like Figure 2-Figure 4 As described, the two first sub-valve flaps 211 are suitable for splicing in the up and down directions to form a complete first valve flap 21, the two second sub-valve flaps 221 are suitable for splicing in the up and down directions to form a complete second valve flap 22, and the two sub-plug bodies 241 are suitable for splicing in the up and down directions to form a complete piston 24, wherein, during actual operation, a first sub-valve flap 211, a second sub-valve flap 221 and a sub-plug body 241 are used in conjunction with each other, and another first sub-valve flap 211, another second sub-valve flap 221 and another sub-plug body 241 are used in conjunction with each other, thereby realizing a semi-closed and semi-open state of the tube-force axial flow slow-closing automatic control valve 100.

[0045] Furthermore, the two sub-plug bodies 241 are respectively located in the first side region and the second side region of the piston cylinder 23, and one of the first side region and the second side region is provided with an adjustment structure 3. Figure 2-Figure 4 As shown, the first side area is the upper area within the piston cylinder 23, the second side area is the lower area within the piston cylinder 23, and a first sub-valve flap 211, a second sub-valve flap 221 and a sub-plug body 241 are located in the upper area within the piston cylinder 23, and another first sub-valve flap 211, another second sub-valve flap 221 and another sub-plug body 241 are located in the lower area within the piston cylinder 23.

[0046] The upper region is connected to an adjustment structure 3 , and the internal pressure state of the upper region of the second sub-cavity 232 can be adjusted by the adjustment structure 3 .

[0047] Through this design, the upper area and the lower area in the valve body 1 can be controlled separately so that the two areas have different closed states. Figure 4 As shown, the upper half of the valve body 1 is in a fully open state, and the lower half of the valve body 1 is in a semi-open state, wherein the first sub-valve flap 211 of the lower half is in a closed state and the second sub-valve flap 221 is in a closing state.

[0048] During actual operation, when fluid flows into the upper half of the valve body 1, it pushes the corresponding first sub-valve flap 211, second sub-valve flap 221, and sub-plug 241 in the upper half toward the right, fully opening the valve. When reverse flow occurs in the lower half of the valve body 1, the fluid pushes the first sub-valve flap 211 in the lower half toward the inlet 111, and the first drain hole 214 corresponding to the first sub-valve flap 211 remains open, allowing a small amount of circulating medium to continue to be discharged, eliminating water hammer. Simultaneously, the reverse flow enters the upper half of the piston cylinder 23 through the connecting conduit 32, causing the second sub-valve flap 221 to slowly close. The second drain hole 224 of the second sub-valve flap 221 drains the medium in the piston cylinder 23, and the piston 24 gradually moves toward the inlet 111, slowly closing the valve. This eliminates vibration and water hammer when the medium is not flowing back, protecting the water pump, motor, and pipelines.

[0049] In some embodiments, the regulating structure 3 includes a regulating valve 31 and a connecting conduit 32. The regulating valve 31 is connected to the connecting conduit 32, and the regulating valve 31 selectively passes the regulating medium into the second sub-chamber 232 through the connecting conduit. Thus, the regulating valve 31 can control the flow state of the flowing medium in the connecting conduit 32 to achieve pressure regulation in the second sub-chamber 232.

[0050] Furthermore, if Figure 1As shown, there are two connecting conduits 32, and the two connecting conduits 32 respectively pass into the second sub-cavity 232 from two positions opposite to each other in the radial direction of the second sub-cavity 232, wherein a portion of the connecting conduit 32 is constructed as an arc tube, and the arc tube extends in the circumferential direction of the second sub-cavity 232 and is connected in the radial direction of the second sub-cavity 232, ensuring that the connecting conduit 32 can provide effective flow medium toward the second sub-cavity 232, thereby improving the pressure state of the second cavity.

[0051] In some embodiments, as Figure 2-Figure 4 As shown, a valve seat 5 is provided at the inlet 111. The valve seat 5 is detachably connected to the valve body 1 and has a sealing structure 51 at the position where the valve seat 5 contacts the first valve disc 21. For example, the sealing surface of the valve seat 5 may be welded with a chromium-nickel alloy and equipped with an EPDM rubber sealing ring to form a soft and hard double seal, thereby achieving fire protection and improving the safety of the pipe-force axial flow slow-closing automatic control valve 100. The valve seat 5 is connected to the end face of the valve body 1 by screws.

[0052] As well as Figure 2-Figure 4 As shown, the valve body 1 includes a first valve body 11 and a second valve body 12, wherein the first valve body 11 and the second valve body 12 are detachably connected and are distributed along the inlet direction, that is, the inlet 111 is provided at one end of the first valve body 11 away from the second valve body 12, and the outlet 121 is provided at one end of the second valve body 12 away from the first valve body 11, as shown in FIG. Figure 2-Figure 4 As shown, the first valve body 11 and the second valve body 12 are connected by bolts.

[0053] 1. In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0054] 2. In the description of the present invention, "first feature" and "second feature" may include one or more of these features.

[0055] 3. In the description of the present invention, “plurality” means two or more.

[0056] 4. In the description of the present invention, a first feature being “above” or “below” a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but via another feature therebetween.

[0057] 5. In the description of the present invention, the phrases “above”, “above” and “above” a first feature to a second feature include the first feature being directly above and obliquely above the second feature, or simply indicate that the first feature is horizontally higher than the second feature.

[0058] Throughout this specification, reference to terms such as "one embodiment," "an embodiment," "an illustrative embodiment," "an example," "a specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative uses of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0059] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A pipe-force axial flow slow-closing automatic control valve, characterized in that: include: a valve body, the valve body having an inlet and an outlet; A valve core assembly, the valve core assembly comprising a first valve flap, a second valve flap, and a piston cylinder, which are sequentially distributed in the flow direction from the inlet to the outlet, the piston cylinder being fixedly mounted in the valve body, the first valve flap and the second valve flap, as well as the second valve flap and the piston cylinder being movably connected along the flow direction, a piston connected to the second valve flap being disposed in the piston cylinder, the piston dividing the interior of the piston cylinder into a first sub-chamber and a second sub-chamber; The first valve flap is adapted to press against the inlet and is provided with a first drain hole. The second valve flap is adapted to press against the first drain hole and is provided with a second drain hole communicating with the first drain hole. The first drain hole is communicated with the first sub-chamber of the piston cylinder. The second sub-chamber of the piston cylinder is connected to an adjustment structure. The first valve flap includes two first sub-valve flaps suitable for splicing and slidably fitting, the second valve flap includes two second sub-valve flaps suitable for splicing and slidably fitting, and the piston includes two sub-plug bodies suitable for splicing and slidably fitting, and the two first sub-valve flaps, the two second sub-valve flaps and the two sub-plug bodies are connected one by one.

2. The pipe-force axial flow slow-closing automatic control valve according to claim 1 is characterized in that: It also includes a guide shaft, the axial direction of the guide shaft is along the inlet direction, and the first valve disc is sleeved on the guide shaft and slides along the axial direction of the guide shaft.

3. The pipe-force axial flow slow-closing automatic control valve according to claim 2, characterized in that: The first valve flap includes a first radial blocking portion and a first axial connecting portion, the first radial blocking portion is connected to one end of the first axial connecting portion, the first radial blocking portion is provided with the first drain hole, and the first axial connecting portion is sleeved outside the guide shaft.

4. The pipe-force type axial flow slow-closing automatic control valve according to claim 1, characterized in that: The second valve flap includes a second radial sealing portion and a second axial connecting portion, the second radial sealing portion is connected to one end of the second axial connecting portion and the other end is connected to the piston, the second axial connecting portion is provided with the second drain hole, and the second axial connecting portion is sleeved outside a portion of the first valve flap.

5. The pipe-force type axial flow slow-closing automatic control valve according to claim 1, characterized in that: The outer diameter of the first valve flap is greater than the outer diameter of the second valve flap, and the inner diameter of the first drain hole is greater than the inner diameter of the second drain hole.

6. The pipe-force type axial flow slow-closing automatic control valve according to claim 1, characterized in that: The two sub-plug bodies are respectively located in a first side area and a second side area of ​​the piston cylinder, and the adjustment structure is provided in one of the first side area and the second side area.

7. The pipe-force type axial flow slow-closing automatic control valve according to claim 1, characterized in that: The regulating structure includes a regulating valve and a connecting conduit. The regulating valve is connected to the connecting conduit, and the regulating valve selectively passes the regulating medium into the second sub-cavity through the connecting conduit.

8. The pipe-force type axial flow slow-closing automatic control valve according to claim 7, characterized in that: There are two connecting conduits, and the two connecting conduits respectively pass into the second sub-cavity from two positions facing each other in the radial direction of the second sub-cavity.

9. The pipe-force axial flow slow-closing automatic control valve according to claim 1, characterized in that: A valve seat is provided at the inlet, the valve seat is detachably connected to the valve body, and a sealing structure is provided at a position where the valve seat contacts the first valve disc.

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