A flow guide valve cover, flow guide valve cover assembly, and anti-freezing fire-resistant breather valve

Abstract

The application discloses a flow guide valve cover, a flow guide valve cover assembly and a freezing-preventing fire-resistant breather valve, and relates to the technical field of valve covers. The flow guide valve cover assembly is arranged above a valve disc of the fire-resistant breather valve, the flow guide valve cover has a flow guide surface which inclines from a central region to an outer peripheral region, and condensed medium falling on the flow guide valve cover can move from above the central region of the valve disc to above the outer peripheral region of the valve disc along the flow guide surface, so that the possibility of the condensed medium directly falling into or staying in the central region of the valve disc and a region near a guide rod is reduced.

Description

Technical Field

[0001] This invention relates to the technical field of flame arrestor breather valves, and more particularly to a flow guide valve cover, a flow guide valve cover assembly, and an anti-condensation flame arrestor breather valve. Background Technology

[0002] In applications involving high-viscosity, easily condensable, or easily solidified media such as heavy oil, residual oil, sludge, and asphalt, the vapor from the medium entering the breather valve tends to condense, be absorbed, or accumulate inside the valve body, valve disc, valve core, and near the guide rod. With increased usage time, the accumulated condensate may affect the valve disc's opening, reseating, and sealing, thereby reducing the breather valve's operational stability.

[0003] Existing anti-condensation flame arrestor breather valves typically reduce the risk of medium condensation through valve body insulation. However, in the area above the valve disc, especially in the center of the valve disc and near the guide rod, local stagnation may still occur due to factors such as concentrated condensate fall paths, abrupt structural changes, and delayed wetting of high-viscosity media. Adding a large baffle or flow guide structure directly above the valve disc may affect the internal ventilation path of the valve body, the full opening stroke of the valve disc, and the pressure setting of the gravity-type valve disc. Summary of the Invention

[0004] In view of the problem that existing flame arrestor breather valves tend to accumulate condensate in the central area of ​​the valve disc and near the guide rod under high-viscosity, easily solidified media conditions, thus affecting the valve disc's opening and closing stability, this invention is proposed.

[0005] Therefore, the purpose of this invention is to provide a flow guide valve cover, which is used to allow high-viscosity condensing medium to slide off the flow guide surface with low resistance and in a directional manner through a flow guide base surface with a low surface roughness factor and a flow guide groove extending in a downward direction.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a flow guide valve cover, comprising a flow guide surface sloping downward from the center side to the outer periphery; the flow guide surface includes a flow guide base surface and a flow guide groove formed on the flow guide base surface; the surface roughness factor r1 of the ungrooved area of ​​the flow guide base surface is <1.60, where r1 is the ratio of the actual surface area of ​​the ungrooved area to the planar projected area; the flow guide groove extends along the downward sloping direction of the flow guide base surface.

[0007] As a preferred embodiment of the flow guide valve cover of the present invention, the flow guide groove includes multiple long grooves, which are spaced apart along the direction intersecting with their length direction; the length direction of each groove extends along the flow guide surface from the high side to the low side, so as to form multiple grooved flow guide channels extending in the downward direction on the flow guide surface.

[0008] As a preferred embodiment of the flow guide valve cover of the present invention, wherein: the area where the flow guide groove is located forms a directional surface with a dominant direction, the surface space parameter Str3 of the directional surface is 0.10~0.25, and the dominant direction is consistent with the length direction of the long groove.

[0009] As a preferred embodiment of the flow guide valve cover of the present invention, wherein: the flow guide surface forms a flow guide angle α with the horizontal plane, the flow guide angle α is not less than the critical slip angle ω0 of the condensing medium to be guided relative to the flow guide base surface at a set working temperature, and the flow guide angle α ≥ 30°.

[0010] Another object of the present invention is to provide a flow guide valve cover assembly, including the flow guide valve cover described above, wherein: it further includes a connecting portion disposed at the center position of the flow guide valve cover, the connecting portion having a guide rod clearance hole for the guide rod of the flame arrester breather valve to pass through; the flow guide surface extends downward from the outside of the connecting portion toward the outer periphery of the flow guide valve cover.

[0011] In a preferred embodiment of the flow guide valve cover assembly of the present invention, the flow guide valve cover is a cover body continuously arranged circumferentially around the guide rod clearance hole; the flow guide surface extends continuously circumferentially around the guide rod clearance hole to form a continuous downward flow guide area on the outer periphery of the guide rod clearance hole.

[0012] As a preferred embodiment of the flow guide valve cover assembly of the present invention, wherein: the flow guide valve cover is a conical valve cover; the flow guide surface is a conical flow guide surface extending circumferentially around the guide rod clearance hole, and the conical flow guide surface slopes continuously downward from the connecting portion to the outer peripheral side of the flow guide valve cover.

[0013] As a preferred embodiment of the flow guide valve cover assembly of the present invention, wherein: the flow guide valve cover further includes a transition support portion connected to the outside of the connecting portion, and the flow guide surface is located on the outer periphery of the transition support portion; the transition support portion is connected between the connecting portion and the flow guide surface, and supports the flow guide surface so that the flow guide surface maintains a downward tilting posture from the connecting portion to the outer periphery.

[0014] In a preferred embodiment of the flow guide valve cover assembly of the present invention, the connecting portion includes a connecting sleeve disposed around the guide rod clearance hole, the connecting sleeve being fitted over the guide rod; the connecting sleeve is provided with a locking member, the locking member passing through the connecting sleeve and abutting or connecting to the guide rod, thereby restricting the axial movement of the connecting sleeve relative to the guide rod.

[0015] As a preferred embodiment of the flow guide valve cover assembly of the present invention, wherein: the outer periphery of the flow guide valve cover is provided with a downwardly extending drip flange; the drip flange is connected to the lower side edge of the flow guide surface, and the lower end of the drip flange is lower than the lower side edge of the flow guide surface, so as to form a drip boundary for the condensing medium to detach from the flow guide valve cover.

[0016] Another object of the present invention is to provide an anti-condensation flame arrestor breather valve, comprising the above-described flow guide valve cover assembly, wherein: it further comprises a valve body, a flame arrestor assembly disposed within the valve body, and at least one valve disc assembly disposed within the valve body; the valve disc assembly comprises a valve seat, a valve disc capable of being raised and lowered relative to the valve seat, and a guide rod connected to the valve disc; the flow guide valve cover assembly is disposed above the valve disc of at least one of the valve disc assemblies.

[0017] In a preferred embodiment of the anti-condensation flame arrestor breather valve of the present invention, the flow guide valve cover assembly is connected to the corresponding guide rod or the valve disc to rise and fall with the corresponding valve disc; the outer periphery of the flow guide valve cover is spaced apart from the inner wall of the valve body to form a ventilation gap communicating with the flame arrestor assembly on the outer periphery of the flow guide valve cover; an opening clearance space is formed between the upper part of the flow guide valve cover and the inner wall of the valve body, and the opening clearance space is located above the movement path of the flow guide valve cover when it rises with the valve disc.

[0018] The beneficial effects of this invention are as follows: The flow guide valve cover of this invention has a flow guide surface that slopes downward from the center to the outer periphery. The flow guide surface includes a flow guide base surface and flow guide grooves formed on the flow guide base surface. The surface roughness factor r1 of the ungrooved area of ​​the flow guide base surface is less than 1.60, which can reduce the actual contact area between the condensing medium and the flow guide base surface and reduce the sliding resistance caused by contact angle hysteresis. The flow guide grooves extend along the downward slope direction of the flow guide base surface, which can restrict the lateral diffusion of the condensing medium and form grooved flow guide channels. As a result, the condensing medium can slide down the flow guide surface with low resistance and directionally from the center to the outer periphery, reducing its local retention, lateral diffusion, and adhesion on the flow guide valve cover.

[0019] When the flow guide valve cover assembly is installed above the valve disc of the flame arrestor breather valve, the flow guide valve cover can be located in the area above the center side of the valve disc and near the guide rod, so that the condensate falling into this area first contacts the flow guide surface and moves along the flow guide surface from the center side to the outer periphery, thereby reducing the possibility of the condensate falling directly into or remaining in the area near the center side of the valve disc and near the guide rod.

[0020] When the guide valve cover is continuously arranged around the guide rod clearance hole or formed into a conical valve cover, the guide surface can form a continuous downward guide path around the guide rod, so that the condensate falling at different circumferential positions can move towards the outer peripheral area of ​​the valve disc, thereby reducing local accumulation and local deflection.

[0021] When the guide surface is provided with a guide groove extending in the downward direction, the guide groove can guide the condensing medium to move in the predetermined sliding direction, reduce the lateral diffusion, retention and movement resistance of the condensing medium on the guide surface when crossing the surface texture, and improve the stability of the condensing medium being discharged from the central area to the outer peripheral area.

[0022] When the outer periphery of the flow guide valve cover is provided with a drip flange, the condensing medium can be removed from the flow guide valve cover at the drip flange after moving to the outer periphery of the flow guide surface. This reduces the possibility of the condensing medium flowing back or adhering along the outer periphery of the flow guide valve cover, and makes the condensing medium more stably discharged from the outer periphery of the valve disc. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a top view of the flow guide valve cover of the present invention.

[0025] Figure 2 For the present invention Figure 1 A magnified view of a portion of the guide surface at point A.

[0026] Figure 3 This is a schematic diagram showing the relationship between the flow guide valve cover assembly and the valve disc in this invention.

[0027] Figure 4 This is a top view of the flow guide valve cover assembly of the present invention.

[0028] Figure 5 This is a partial cross-sectional view of the flow guide valve cover assembly of the present invention.

[0029] Figure 6 This is a schematic diagram of the flow guide groove arrangement of the flow guide valve cover assembly of the present invention.

[0030] Figure 7 This is a schematic diagram of the structure of the anti-condensation flame arrestor breather valve of the present invention.

[0031] Figure 8 This is a schematic diagram of the principle of droplet critical slip angle testing.

[0032] Figure 9 This is a schematic diagram of the Young contact angle.

[0033] Figure 10 This is a schematic diagram of the forward contact angle and the backward contact angle.

[0034] Figure 11Schematic diagrams of different surface textures.

[0035] Figure 12 This is a graph showing the relationship between theoretical and measured contact angles.

[0036] Figure 13 This is a graph showing the relationship between surface roughness factor, contact angle hysteresis, and wetting resistance coefficient.

[0037] Figure 14 This is a comparison chart of contact angle hysteresis for different samples.

[0038] Figure 15 This is a graph showing the relationship between critical slip angles under different media and temperatures.

[0039] Figure 16 The graph shows the relationship between |Ssk| and contact angle hysteresis.

[0040] Figure 17 This is a graph showing the relationship between Sku and contact angle hysteresis.

[0041] Figure 18 This is a graph showing the relationship between Str3 and contact angle hysteresis.

[0042] Explanation of reference numerals in the attached drawings: 100, flow guide valve cover assembly; 101, flow guide valve cover; 101a, central area; 101b, outer peripheral area; 101c, flow guide surface; 101c1, flow guide base surface; 102, connecting part; 102a, connecting sleeve; 102b, locking element; 103, guide rod clearance hole; 104, transition support part; 105, drip flange; 106, flow guide groove; 200, valve body; 201, valve disc assembly; 201a, valve seat; 201b, valve disc; 201c, guide rod; 300, flame arrestor assembly. Detailed Implementation

[0043] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0044] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0045] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0046] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0047] Example 1

[0048] Reference Figure 1 , Figure 3 , Figure 9 and Figure 10 This embodiment provides a flow guide valve cover 101, which has a flow guide surface 101c that slopes downward from the center to the outer periphery. The flow guide surface 101c includes a flow guide base surface 101c1 and a flow guide groove 106 formed on the flow guide base surface 101c1. The flow guide base surface 101c1 is used to receive the condensate falling onto the flow guide valve cover 101, and the flow guide groove 106 extends along the downward slope direction of the flow guide base surface 101c1, allowing the condensate to move from the high position side to the low position side along the flow guide surface 101c.

[0049] The guide surface 101c1 has an ungrooved region. The ungrooved region refers to the surface area on the guide surface 101c1 where the guide grooves 106 are not formed. This ungrooved region serves as the basic contact surface for the condensing medium to slide down. The surface roughness factor r1 of the ungrooved region of the guide surface 101c1 is < 1.60, where r1 is the ratio of the actual surface area of ​​the ungrooved region to its projected area. Here, the surface roughness factor r1 differs from conventional roughness parameters such as Ra, Rz, and Sa, which are measured in units of length; r1 is a dimensionless area ratio. The larger r1 is, the greater the increase in the actual surface area of ​​the ungrooved region relative to its projected area due to microscopic irregularities; the closer r1 is to 1, the closer the ungrooved region is to a flat surface.

[0050] After a high-viscosity condensing medium falls onto the guide surface 101c, the actual contact area between the condensing medium and the guide base surface 101c1 affects the ease with which the condensing medium slides down the guide surface 101c. If the surface roughness factor r1 of the guide base surface 101c1 is too large, the condensing medium is more likely to enter the micro-pits of the guide base surface 101c1 or be blocked by micro-peaks, resulting in a strong contact angle hysteresis at the boundary of the condensing medium, making it difficult for the condensing medium to slide down the guide surface 101c. Controlling the surface roughness factor r1 of the ungrooved area of ​​the guide base surface 101c1 to less than 1.60 can reduce the actual contact area between the condensing medium and the guide base surface 101c1, thereby reducing the retention resistance of the condensing medium on the guide base surface 101c1.

[0051] Reference Figure 9To illustrate the wetting relationship of a liquid on a solid surface, for an ideal smooth solid surface, the static contact angle between the droplet and the solid surface can be expressed by the Young equation: , in, It is the contact angle between liquid and solid. It is the surface free energy at the solid-gas interface. It is the surface free energy at the solid-liquid interface. It is the surface free energy at the liquid-gas interface.

[0052] The actual guiding surface 101c1 is not an ideally smooth surface. For solid surfaces with microscopically rough morphology, the apparent contact angle of the droplet can be represented by the Wenzel model: , in, The apparent contact angle under the Wenzel model. The contact angle under the Young model. 1 represents the surface roughness factor, which is the ratio of the actual surface area of ​​a rough surface to its projected area. From the formula above, it can be seen that the surface roughness factor... This will affect the apparent wetting state of the droplets on the guiding substrate 101c1. When When 1 increases, the actual contact area between the condensing medium and the guide surface 101c1 increases, and the adhesion and retention of the condensing medium in the micro-uneven structure becomes more obvious, which is not conducive to the movement of the condensing medium along the guide surface 101c.

[0053] As a droplet moves along an inclined surface, the droplet's leading edge forms an advancing contact angle, and its trailing edge forms a receding contact angle. The difference between these two angles constitutes contact hysteresis. This contact hysteresis generates wetting resistance that hinders droplet slippage, which can be expressed as: , in, The drag caused by contact angle hysteresis. Forward contact angle, For the retreat contact angle, The contact radius of the three-phase contact wire. Let be the surface tension of the liquid. From this equation, it can be seen that, given a fixed surface tension and contact line dimensions, the greater the difference between the advancing and retreating contact angles, the greater the resistance experienced by the droplet as it moves on the guiding surface 101c1.

[0054] When the guide surface 101c is inclined, the condensing medium is subjected to a gravitational component along the downward inclination direction of the guide surface 101c. The critical state at which the droplets begin to slide can be expressed as: , in, For the mass of the droplet, It is the acceleration due to gravity. ω is the critical slip angle at which the droplet begins to slide, and w is the effective contact line length of the droplet along the direction perpendicular to the slip direction. It should be noted that... In this equation, r2 represents the receding contact angle, which is different from the aforementioned surface roughness factor r1. From this equation, it can be seen that the downward-sloping structure of the guide surface 101c can provide the condensing medium with a gravitational component that moves along the downward direction; when this gravitational component overcomes the wetting resistance corresponding to the contact angle hysteresis, the condensing medium begins to slide down along the guide surface 101c.

[0055] To verify the effect of the surface roughness factor r1 of the 101c1 guide surface on the sliding resistance of the condensing medium, a roughness comparison experiment was conducted using a stainless steel block sample. The sample size was 2cm × 2cm × 0.3cm. After polishing, the sample surface was ground with sandpaper of different grits. After grinding, the sample surface was contour scanned to obtain the actual surface area, and the ratio of the actual surface area to the projected area of ​​the plane was used as the surface roughness factor r1. The experimental results are shown in Table 1 below.

[0056] Table 1: Test results of surface roughness factor for different surface treatment methods

[0057] As shown in Table 1, under the same planar projected area, different surface treatment methods result in significant differences in the actual sample surface area. The surface roughness factors r1 of samples S1 and S2 are 2.65 and 2.14, respectively, indicating that their actual surface areas are much larger than their planar projected areas, and the condensing medium easily forms a large actual contact area on this type of surface. The surface roughness factor r1 of sample S3 is 1.60, which can be used as a comparison sample close to the critical value; the surface roughness factor r1 of sample S4 is 1.10, which meets the requirement of r1 < 1.60 in this embodiment, indicating that as the surface treatment becomes smoother, the difference between the actual surface area and the planar projected area decreases.

[0058] Reference Figure 12 The theoretical contact angle and the measured contact angle show a good correlation, indicating that the contact angle test results can be used to evaluate the wetting state of the guiding base surface 101c1. (Refer to...) Figure 13 As the surface roughness factor r1 decreases, the contact angle hysteresis and wetting resistance coefficient show an overall downward trend, indicating that reducing the surface roughness factor of the ungrooved area of ​​the guide surface 101c1 is beneficial to reducing the sliding resistance of the condensing medium on the guide surface 101c.

[0059] Therefore, in this embodiment, the surface roughness factor r1 of the ungrooved area of ​​the guide surface 101c1 is controlled to be less than 1.60, so that the guide surface 101c1 has a lower actual contact area increment, thereby reducing the wetting resistance of the high-viscosity condensing medium on the guide surface 101c1. This limitation is not simply to pursue a bright surface, but to reduce the resistance when the condensing medium slides down the downward direction of the guide surface 101c.

[0060] Meanwhile, a guide groove 106 is formed on the guide base surface 101c1 and extends along the downward slope of the guide base surface 101c1. The guide groove 106 is used to provide a groove-oriented path for the condensing medium to move along the downward slope. That is, the ungrooved area of ​​the guide base surface 101c1 reduces the contact resistance between the condensing medium and the guide base surface 101c1 through a lower surface roughness factor r1, while the guide groove 106 restricts the lateral diffusion of the condensing medium through its own extension direction, making it easier for the condensing medium to slide down the guide surface 101c1 from the high side to the low side.

[0061] Therefore, the guide surface 101c in this embodiment is not an ordinary inclined shielding surface, but a low-resistance directional sliding surface jointly formed by the guide base surface 101c1 with a low surface roughness factor and the guide groove 106 extending in the downward inclination direction. For high-viscosity, easily condensable or easily solidified media such as heavy oil, residual oil, sludge oil, and asphalt, after the condensed medium falls onto the guide surface 101c, it can reduce the retention resistance on the guide base surface 101c1 and move in the predetermined downward inclination direction under the guidance of the guide groove 106, thereby reducing the local retention, lateral diffusion and adhesion of the condensed medium on the guide valve cover 101.

[0062] During operation, when the high-viscosity vapor medium inside the flame arrestor breather valve condenses inside the valve body and falls onto the guide valve cover 101, the condensed medium first contacts the guide surface 101c. Since the guide surface 101c slopes downwards from the center to the outer periphery, the condensed medium experiences a gravitational component along the downward slope of the guide surface 101c. Because the surface roughness factor r1 of the ungrooved area of ​​the guide base surface 101c1 is < 1.60, the actual contact area increment of the condensed medium on the guide base surface 101c1 is relatively small. Simultaneously, because the guide groove 106 extends along the downward slope of the guide base surface 101c1, the condensed medium can move along the extension direction of the guide groove 106. These three factors work together to make the condensed medium slide more stably from the center to the outer periphery of the guide valve cover 101.

[0063] Example 2

[0064] Reference Figure 6 , Figure 11 , Figure 14 , Figures 16 to 18This is the second embodiment of the present invention, which differs from the first embodiment in that: the guide groove 106 includes multiple long grooves, which are spaced apart along a direction intersecting the length direction of the guide groove. The length direction of each long groove extends along the guide surface 101c from the high side to the low side, so as to form multiple grooved guide channels extending in a downward direction on the guide surface 101c.

[0065] In this context, the elongated groove refers to a groove whose length is greater than its width, forming a groove-like structure with a dominant extension direction on the guide surface 101c. For a conical guide surface, the length of the elongated groove can extend along the generatrix of the conical guide surface; for a non-standard conical surface or a segmented downward-sloping surface, the length of the elongated groove can extend along the maximum downward-sloping direction of the guide base surface 101c1. Thus, after the condensing medium falls onto the guide surface 101c, it does not need to frequently cross the transverse groove wall or disordered protrusions, but can instead move from the higher to the lower side along the length of the elongated groove.

[0066] Multiple long, groove-shaped grooves are spaced apart along their length, creating channel-like flow channels at different circumferential or lateral positions on the flow guiding surface 101c. Compared to a single flow guiding groove, multiple long, groove-shaped grooves can expand the flow guiding coverage area, allowing high-viscosity condensing media falling to different positions on the flow guiding surface 101c to be guided by adjacent long, groove-shaped grooves, thereby reducing lateral diffusion, local accumulation, and retention of the condensing media on the flow guiding surface 101c.

[0067] It should be noted that the elongated groove in this embodiment is not intended to treat the guide surface 101c as a disordered, highly rough surface. As described in Embodiment 1, if the surface roughness factor of the guide base surface 101c1 is too large, the actual contact area between the condensing medium and the guide base surface 101c1 increases, which in turn enhances the contact angle hysteresis. Therefore, the elongated groove in this embodiment is intended to form a dominant texture extending along the predetermined sliding direction of the condensing medium, enabling the guide surface 101c to simultaneously possess both low contact resistance and a clearly directional guiding capability.

[0068] To characterize the directionality of the region where the guide groove 106 is located, a directional surface with a dominant direction is formed in the region where the guide groove 106 is located. The surface spatial parameter Str3 of the directional surface is 0.10~0.25, and the dominant direction is consistent with the length direction of the long groove.

[0069] The surface spatial parameter Str3 is used to characterize the directionality of surface texture. The closer Str3 is to 1, the smaller the difference in surface texture in different directions, and the surface tends to be isotropic; the closer Str3 is to 0, the more obvious the striped or directional texture of the surface, and the more obvious the dominant direction. Therefore, by controlling the Str3 of the region where the guide groove 106 is located between 0.10 and 0.25, the guide surface 101c can form a more obvious groove-oriented dominant texture, and make this dominant direction consistent with the direction in which the condensing medium slides down the guide surface 101c.

[0070] To verify the influence of different surface morphologies on orientation, stainless steel block samples were prepared. The sample dimensions were 2cm × 2cm × 0.3cm. After polishing, the sample surfaces were first sanded with sandpaper of different grits, and then some samples were laser-marked to create different types of surface textures. S4 is the reference surface, S5 is a square texture, S6 is a circular texture, S7 is a rectangular texture, and S8 is a long groove texture. The surface morphology parameters obtained after three-dimensional contour scanning of each sample are shown in Table 2 below.

[0071] Table 2: Test results of different surface texture morphology parameters

[0072] Table 2 shows that the Str3 values ​​for the S5 square texture and the S6 circular texture are 0.9089 and 0.9713, respectively, close to 1, indicating that the texture differences in different directions are small and there is no obvious dominant direction. The Str3 values ​​for the S7 rectangular texture and the S8 long groove texture are 0.2005 and 0.1207, respectively, significantly lower than those for S5 and S6, indicating that the rectangular texture and long groove texture can form a more obvious directional surface. Among them, the Str3 value of the S8 long groove texture is even lower, indicating that its striped and groove-oriented dominant characteristics are more obvious.

[0073] Reference Figure 16 and Figure 17 The surface height distribution parameters Ssk and Sku show a correlation with the contact angle hysteresis, indicating that the micro-geometry affects the retention and sliding resistance of droplets on the surface. (Refer to...) Figure 18 There is a corresponding relationship between the surface spatial parameter Str3 and the contact angle hysteresis. The closer Str3 is to 0, the more obvious the surface directionality. When the Str3 of the area where the guide groove 106 is located is 0.10 to 0.25, a directional surface with a dominant direction can be formed.

[0074] In some embodiments, the surface spatial parameter Str3 of the region where the guide channel 106 is located can be set to 0.10 to 0.25, so that the region where the guide channel 106 is located forms a directional surface with a dominant direction. This dominant direction is consistent with the length direction of the elongated groove and with the direction of the guide surface 101c from the high side to the low side, so that the condensing medium mainly moves along the groove direction when it slides down the guide surface 101c.

[0075] To further verify the influence of directional texture on droplet motion resistance, the aforementioned samples were tested for advancing contact angle, receding contact angle, and contact angle hysteresis. During the test, the droplet volume was increased or decreased using a micro-injection tube, which was inserted into the center of the droplet, with each injection or aspiration volume not exceeding 0.1 μL. The droplet change process was recorded by a camera. When the droplet reached a critical state, the three-phase contact line of the droplet shifted; the contact angle measured when it expanded outward was the advancing contact angle, and the contact angle measured when it contracted inward was the receding contact angle. The experiment was conducted at a temperature of 25℃ and a humidity of 75%. Each group of experiments was performed five times, and the average of the three intermediate data sets was taken after removing the maximum and minimum values. The test results are shown in Table 3 below.

[0076] Table 3: Contact Angle Hysteresis Test Results of Samples with Different Oriented Textures

[0077] in, The apparent contact angle, Forward contact angle, For the retreat contact angle, This is due to contact angle hysteresis. This indicates that the rectangular texture sample was tested along a direction parallel to its long side. This indicates that the rectangular texture sample is tested along the direction perpendicular to its long side; This indicates that the sample with the long groove-shaped texture was tested along the direction parallel to the long side. This indicates that the long groove-shaped textured sample is tested along the direction perpendicular to the long side.

[0078] As shown in Table 3, the S7 rectangular textured sample exhibits contact angle hysteresis when tested in the direction parallel to the long side. The contact angle is 43.37°; when tested in the direction perpendicular to the long side, the contact angle hysteresis is observed. The contact angle is 54.84°, a difference of 11.47°. When the S8 long groove textured sample is tested parallel to its long side, the contact angle hysteresis is... The contact angle is 37.64°; when tested in the direction perpendicular to the long side, the contact angle hysteresis is observed. The value is 57.11°, and the difference between the two is 19.47°.

[0079] The above results indicate that for surfaces with directional textures, the contact hysteresis of droplets moving along the dominant texture direction is less than that of droplets moving perpendicular to the dominant texture direction. In particular, the S8 long groove texture sample shows that the contact hysteresis parallel to the long side is significantly less than that perpendicular to the long side, indicating that the long groove texture can reduce the wetting resistance of droplets moving in the direction parallel to the groove. However, in the direction perpendicular to the groove, the resistance increases significantly because the droplet needs to cross adjacent groove structures.

[0080] Based on the above experimental results, in this embodiment, the guide channel 106 is configured as multiple long grooves, and the length direction of each long groove extends along the guide surface 101c from the high side to the low side. Therefore, the area where the guide channel 106 is located not only forms a directional surface with a Str3 of 0.10 to 0.25, but the dominant direction of this directional surface is also consistent with the predetermined sliding direction of the condensing medium on the guide surface 101c. When the condensing medium slides along the guide surface 101c, it mainly moves along the length direction of the long grooves, thereby reducing the lateral spreading and the motion resistance generated by crossing the channel wall.

[0081] It should be noted that the guide groove 106 in this embodiment is not intended to increase the disordered roughness of the guide surface 101c, but rather to form a dominant texture extending along the sliding direction. The ungrooved area of ​​the guide base surface 101c1 reduces the actual contact resistance between the condensing medium and the guide base surface 101c1 through a lower surface roughness factor r1, while the guide groove 106 defines the sliding direction of the condensing medium through its elongated groove structure. The two work together to form a low-resistance and directional guide surface on the guide surface 101c.

[0082] During use, when high-viscosity condensing media such as heavy oil, residual oil, sludge oil, and asphalt fall onto the guide surface 101c, the condensing media moves from the higher to the lower side along the guide surface 101c under the influence of gravity. Since the guide channel 106 extends along the downward inclination direction of the guide surface 101c, the condensing media can slide down along the channel to guide the flow channel, and is less likely to undergo disordered lateral diffusion, local accumulation, or retention on the guide surface 101c, thereby improving the stability of the condensing media being discharged in the predetermined direction.

[0083] The remaining structure is the same as that in Example 1.

[0084] Example 3

[0085] Reference Figure 8 and Figure 15This is the third embodiment of the present invention, which differs from the second embodiment in that a guiding angle α is formed between the guiding surface 101c and the horizontal plane. The guiding angle α is the angle formed between the downward inclination direction of the guiding surface 101c from the high side to the low side and the horizontal plane. For a conical guiding surface, the guiding angle α can be understood as the angle of inclination of the conical guiding surface along its generatrix direction relative to the horizontal plane; for a segmented or approximately conical guiding surface, the guiding angle α can be understood as the angle of inclination of the main downward inclination region of the guiding surface 101c used to guide the condensing medium to slide down relative to the horizontal plane.

[0086] In this embodiment, the guiding angle α is not less than the critical slip angle ω0 of the condensing medium to be guided relative to the guiding base surface 101c1 at the set operating temperature, and the guiding angle α is not less than 30°. The critical slip angle ω0 refers to the tilt angle at which the condensing medium droplet begins to slip as the guiding base surface 101c1 gradually tilts when it is located on the guiding base surface 101c1.

[0087] When the condensing medium is located on the guide surface 101c, it is subjected to a gravitational component along the downward direction of the guide surface 101c, and also to retention resistance caused by contact angle hysteresis. According to the description of contact angle hysteresis in Example 1, the greater the difference between the advancing contact angle and the retreating contact angle, the greater the resistance experienced by the condensing medium when sliding on the guide surface 101c.

[0088] As the inclination angle of the guide surface 101c gradually increases, the gravitational component of the condensing medium along the downward inclination direction of the guide surface 101c gradually increases. When this gravitational component can overcome the retention resistance caused by the contact angle hysteresis, the condensing medium begins to slide down the guide surface 101c. The inclination angle corresponding to this state is the critical sliding angle ω0. Therefore, ensuring that the guide inclination angle α is not less than the critical sliding angle ω0 allows the condensing medium to have the inclination angle condition to slide down the guide surface 101c to the lower side under the corresponding operating temperature, medium type, and surface condition.

[0089] To determine the critical slip angle of high-viscosity condensing media under different operating conditions, the critical slip angle of 120# heavy oil, 180# heavy oil, and 380# heavy oil were tested using a tilted plate at 50℃, 75℃, and 100℃. During the test, a droplet was placed on the sample surface. After the droplet reached equilibrium, the sample stage was slowly rotated around a fixed point while gradually increasing the tilt angle. When the solid-liquid contact area of ​​the droplet was about to change and slip began, the corresponding tilt angle was recorded as the critical slip angle ω0. The test results are shown in Table 4 below.

[0090] Table 4: Critical slip angle test results under different heavy oil media and temperatures

[0091] Table 4 shows that for the same heavy oil medium, the critical slip angle ω0 decreases overall with increasing temperature. This is because as temperature increases, the viscosity of the heavy oil medium decreases, enhancing the fluidity of the condensing medium on the guide surface 101c1, making it easier to overcome the retention resistance caused by contact angle hysteresis. For different heavy oil media, at the same temperature, media with higher grades and higher viscosity generally correspond to larger critical slip angles, indicating that they require larger guide angles to achieve more stable slippage. (Refer to...) Figure 15 The critical slip angle of different media at different temperatures generally decreases as the temperature increases, and media with higher viscosity usually correspond to a larger critical slip angle.

[0092] Table 4 also shows that the critical slip angles of 120# and 180# heavy oils are both less than 30° in the range of 50°C to 100°C; the critical slip angles of 380# heavy oil are less than 30° at 75°C and 100°C, and approximately 30.05° at 50°C. Therefore, in this embodiment, 30° is not necessarily interpreted as being greater than the absolute value of the critical slip angle under all media and all temperature conditions. Instead, the guiding angle α is set to simultaneously satisfy: not less than the critical slip angle ω0 of the condensing medium to be guided at the set operating temperature, and not less than 30°.

[0093] Based on the above limitations, when the critical slip angle ω0 is less than 30° under a certain operating condition, the guiding angle α must be at least 30°; when the critical slip angle ω0 is slightly higher than 30° under a certain operating condition, for example, the critical slip angle of 380# heavy oil at 50°C is approximately 30.05°, the guiding angle α must still not be less than this critical slip angle ω0. This can cover the preferred angles for most typical heavy oil operating conditions, while avoiding the absolutization of 30° into a fixed critical value that ensures sufficient slip under all operating conditions.

[0094] Meanwhile, a larger guide angle α is not always better. For the anti-condensation flame arrestor breather valve, the guide valve cover 101 is positioned above the valve disc 201b and can rise and fall with the valve disc 201b or the guide rod 201c. The valve disc 201b itself needs to maintain a predetermined starting height and full opening height to ensure the normal ventilation performance of the breather valve. As the guide angle α increases, the space occupied by the conical guide valve cover 101 in the height direction increases; if the shell height of the valve body 200 remains unchanged, the guide valve cover 101 may interfere with the structure above the valve body 200 when it jumps up with the valve disc 201b, causing the valve disc 201b to fail to reach the predetermined opening height.

[0095] Therefore, as the guide angle α increases, the height of the valve body 200 needs to be increased accordingly, or an allowance space needs to be opened, to ensure that the valve disc 201b does not interfere with the upper structure when it drives the guide valve cover 101 to jump upwards. Increasing the height of the housing will increase the overall mass of the breather valve; simultaneously, the guide valve cover 101 itself will also experience a change in mass due to the angle change. In other words, the selection of the guide angle α not only affects the ability of the condensate to slide off, but also the weight of the follow-up part of the guide valve cover 101, the height of the valve body 200, the overall weight of the breather valve, and the pressure setting of the self-weight valve disc.

[0096] Taking the DN200 anti-condensation integrated flame arrestor breather valve as an example, based on the same shell structure, when the guide angle α of the conical guide valve cover 101 increases, the height of the valve body 200 needs to be increased accordingly to ensure the full opening height of the valve disc 201b. The changes in height and weight corresponding to different guide angles are shown in Table 5 below.

[0097] Table 5: Results of height and weight variations corresponding to different guide angles

[0098] Wherein, ΔH is the height that the valve body 200 needs to increase to ensure the full opening height of the valve disc 201b; ΔM1 is the mass increment of the guide valve cover 101 caused by the change in the guide angle; and ΔM2 is the overall mass increment of the breather valve caused by the increase in the height of the valve body 200.

[0099] As shown in Table 5, as the guide angle α increases from 35° to 60°, the required increase in height ΔH to ensure the full opening height of valve disc 201b increases from 14.3 mm to 134.5 mm, the increase in mass ΔM1 of the guide valve cover 101 increases from 2.9 g to 27.2 g, and the increase in mass ΔM2 of the entire breathing valve increases from 4936.7 g to 46432.6 g. Therefore, increasing the guide angle α significantly increases the height compensation of valve body 200 and the overall weight of the device.

[0100] For a weight-bearing flame arrestor breather valve, the flow guide valve cover 101 rises and falls with the valve disc 201b or guide rod 201c. The increase in its own mass may affect the opening pressure and reseating state of the valve disc 201b. Furthermore, the increased overall mass due to the increased height of the valve body 200 will increase product weight, manufacturing costs, and installation burden. Simultaneously, an excessively large flow guide angle α may compress the ventilation gap and opening clearance space inside the valve body 200, affecting the normal breathing performance of the breather valve. Therefore, in this embodiment, the flow guide angle α is set to be not less than the critical slip angle ω0 and not less than 30°. This is not simply about pursuing a larger angle, but rather about achieving a balance between the condensate slippage capability, the full opening stroke of the valve disc 201b, the following weight of the flow guide valve cover 101, the height of the valve body 200, the overall weight of the breather valve, and the weight-bearing pressure setting.

[0101] Therefore, in this embodiment, the guide angle α is set to be no less than the critical slip angle ω0 and no less than 30°. This is not simply about pursuing a larger angle, but rather about achieving a balance between the condensate slippage capacity, the full opening stroke of the valve disc 201b, the internal space of the valve body 200, the weight of the guide valve cover 101, and the weight-based pressure setting. For most heavy oil operating conditions, 30° provides a good slippage foundation; for specific operating conditions where the critical slippage angle is slightly higher than 30°, the constraint that α is no less than ω0 ensures that the guide surface 101c still has a sufficient slippage angle.

[0102] During use, when the high-viscosity condensing medium falls onto the guide surface 101c, the ungrooved area of ​​the guide base surface 101c1 reduces the contact resistance between the condensing medium and the guide base surface 101c1 through a lower surface roughness factor. The guide groove 106 guides the condensing medium to move in a directional direction along the downward slope, and the guide angle α provides the gravity component required for the condensing medium to slide down the lower side. When α is not less than the critical slip angle ω0, the condensing medium can overcome the retention resistance caused by the contact angle hysteresis and slide along the guide surface 101c; when α is further satisfied to be not less than 30°, the guide valve cover 101 can adapt to the typical slip requirements of most heavy oil condensing media.

[0103] Therefore, the guiding angle α in this embodiment works in conjunction with the low surface roughness factor guiding base surface 101c1 in Embodiment 1 and the long groove-shaped guiding channel 106 in Embodiment 2: the guiding base surface 101c1 reduces the actual solid-liquid contact resistance, the guiding channel 106 defines the channel-oriented sliding path, and the guiding angle α provides the gravitational component required to overcome contact angle hysteresis. Together, these three elements enable the high-viscosity condensing medium to slide more stably along the guiding surface 101c from the center to the outer periphery, and reduce the retention, lateral diffusion, and adhesion of the condensing medium on the guiding surface 101c.

[0104] The remaining structure is the same as that in Example 2.

[0105] Example 4

[0106] Reference Figures 3-5 This is the fourth embodiment of the present invention. The difference between this embodiment and the third embodiment is that the flow guide valve cover assembly 100 includes a flow guide valve cover 101 and a connecting part 102 disposed on the central side of the flow guide valve cover 101. The connecting part 102 is provided with a guide rod clearance hole 103, which is used for the guide rod 201c of the flame arrester breathing valve to pass through.

[0107] Specifically, the connecting part 102 is located on the center side of the flow guide valve cover 101, and the guide rod clearance hole 103 passes through the connecting part 102 along the height direction of the flow guide valve cover 101. The position of the guide rod clearance hole 103 corresponds to the axis of the guide rod 201c, so that when the flow guide valve cover assembly 100 is installed in the flame arrestor breather valve, the guide rod 201c can pass through the guide rod clearance hole 103, and the flow guide valve cover 101 can be arranged around the area where the guide rod 201c is located.

[0108] The guide surface 101c extends downward from the outside of the connecting portion 102 to the outer periphery of the guide valve cover 101. That is, the connecting portion 102 is located near the center or high side of the guide surface 101c, and the guide surface 101c decreases from the outside of the connecting portion 102 to the outer periphery, so that the condensate falling around the connecting portion 102 or on the high side of the guide surface 101c can move along the guide surface 101c to the outer periphery of the guide valve cover 101.

[0109] In a flame arrestor breather valve, the guide rod 201c is typically connected to the valve disc 201b and located near the central area of ​​the valve disc 201b. For high-viscosity, easily condensable or easily solidified media such as heavy oil, residual oil, sludge oil, and asphalt, condensable media tend to adhere to or accumulate near the guide rod 201c, on the central side of the valve disc 201b, and at the junction of adjacent structures. If the flow guide valve cover 101 cannot be adapted to the through-structure of the guide rod 201c, it is difficult for the flow guide valve cover 101 to be stably arranged above the valve disc 201b, and it is also difficult to effectively guide the flow in the area near the guide rod 201c.

[0110] In this embodiment, by providing a guide rod clearance hole 103 on the connecting part 102, the flow guide valve cover 101 can be installed around the guide rod 201c without needing to be offset from the guide rod 201c. Therefore, the flow guide valve cover 101 can form a flow guide surface 101c that slopes downwards from the center to the outer periphery around the guide rod 201c, with the location of the guide rod 201c as a center reference. This allows the condensate above and near the guide rod 201c to be received by the flow guide surface 101c and guided outwards.

[0111] The diameter of the guide rod clearance hole 103 can be larger than the outer diameter of the guide rod 201c to allow the guide rod 201c to pass through, and to allow for assembly errors or minor deviations during the lifting and lowering process of the guide rod 201c. The guide rod clearance hole 103 can be a round hole or a non-round hole that matches the cross-sectional shape of the guide rod 201c, as long as it allows the guide rod 201c to pass through and prevents the flow guide valve cover 101 from interfering with the movement of the guide rod 201c.

[0112] The connecting portion 102 can be a thickened portion, a boss portion, a sleeve mounting portion, or a flat mounting portion formed on the central side of the flow guide valve cover 101. The connecting portion 102 and the flow guide valve cover 101 can be integrally formed, or they can be fixedly connected by welding, riveting, pressing, screwing, or other methods. Preferably, a smooth transition is formed between the connecting portion 102 and the flow guide valve cover 101 to reduce the retention of condensate at the junction of the connecting portion 102 and the flow guide surface 101c.

[0113] During use, when the high-viscosity medium vapor inside the valve body 200 condenses and falls towards the area where the valve disc 201b is located, some of the condensed medium may fall near the guide rod 201c or the central area of ​​the flow guide valve cover 101. Since the guide rod 201c passes through the guide rod clearance hole 103 on the connecting part 102, the flow guide valve cover 101 can be stably arranged around the guide rod 201c; and since the flow guide surface 101c extends downward from the outside of the connecting part 102 to the outer periphery of the flow guide valve cover 101, the condensed medium falling around the connecting part 102 can move towards the outer periphery along the flow guide surface 101c, and is less likely to directly accumulate near the guide rod 201c.

[0114] Therefore, in this embodiment, the connecting part 102 and the guide rod clearance hole 103 are not simply mounting holes, but are designed to adapt the flow guide valve cover 101 to the structural environment where the guide rod 201c is centrally located in the flame arrestor breather valve, and to enable the flow guide surface 101c to form a continuous or substantially continuous downward flow guide path around the guide rod 201c. This structure helps to reduce the retention of condensate near the guide rod 201c and on the center side of the valve disc 201b, providing a structural basis for the subsequent installation or lifting of the flow guide valve cover 101 along with the valve disc assembly 201.

[0115] Example 5

[0116] Reference Figures 3 to 5 This is the fifth embodiment of the present invention, which differs from the previous embodiments in that: the flow guide valve cover 101 is a cover continuously arranged circumferentially around the guide rod clearance hole 103. The flow guide surface 101c extends continuously circumferentially around the guide rod clearance hole 103 to form a continuous downward flow guide region on the outer periphery of the guide rod clearance hole 103.

[0117] Specifically, the guide rod clearance hole 103 is located on the center side of the flow guide valve cover 101, and the flow guide valve cover 101 expands outward from the guide rod clearance hole 103 as the center. The flow guide surface 101c is continuously distributed in the circumferential direction of the guide rod clearance hole 103, rather than being a partial flow guide plate only provided on one side of the guide rod 201c. Thus, different circumferential positions on the outer periphery of the guide rod clearance hole 103 can form a flow guide path that slopes downward from the center side to the outer periphery.

[0118] In actual use of the flame arrester breather valve, the condensate may not drip from a fixed direction. Instead, it may condense on the inner wall of the valve body 200, near the flame arrester assembly 300, the upper part of the valve cavity, or other structural surfaces, and then fall onto the valve disc 201b from different circumferential positions. If the flow guide valve cover 101 only has a flow guide surface in a local direction, the condensate may fall directly into the vicinity of the guide rod 201c or the center side of the valve disc 201b from a circumferential position where no flow guide surface is provided, thus still posing a risk of local accumulation. In this embodiment, by continuously circumferentially arranging the flow guide valve cover 101 around the guide rod clearance hole 103, the flow guide valve cover 101 can receive and guide the guide rod 201c in the circumferential direction.

[0119] Furthermore, the flow guide valve cover 101 can be a conical valve cover, and the flow guide surface 101c can be a conical flow guide surface extending circumferentially around the guide rod clearance hole 103. The conical flow guide surface slopes continuously downward from the connecting part 102 to the outer peripheral side of the flow guide valve cover 101. For the conical valve cover, the flow guide surface 101c slopes downward from the center side where the connecting part 102 is located to the outer peripheral side along its generatrix direction, so that the condensing medium is guided on the flow guide surface 101c from the center side to the outer peripheral side.

[0120] The conical guide surface can be a conical surface, an arc-shaped conical surface that approximates a conical surface, or a segmented conical surface. As long as the guide surface 101c extends circumferentially around the guide rod clearance hole 103 and continuously slopes downward from the outside of the connecting part 102 to the outer periphery of the guide valve cover 101, the conical guide surface described in this embodiment can be formed.

[0121] When the guide surface 101c is a conical guide surface, it has a downward sloping direction from the center to the outer periphery at different circumferential positions. For any circumferential position of the guide surface 101c, the condensing medium can move outward along the conical guide surface at that position. Compared to a single-sided inclined surface or a local guide plate, the conical guide surface reduces the possibility of the condensing medium forming a local stagnation zone or flow deviation zone at a certain circumferential position.

[0122] In some embodiments, the guiding base surface 101c1, the guiding groove 106, and the guiding angle α can all be formed on the conical guiding surface of this embodiment. In this case, the guiding base surface 101c1 is continuously distributed circumferentially around the guide rod clearance hole 103, and the guiding groove 106 can extend along the generatrix direction of the conical guiding surface, so that the length direction of the guiding groove 106 is consistent with the downward inclination direction of the conical guiding surface. In this way, the guiding base surface 101c1 with a low surface roughness factor, the guiding groove 106 extending along the downward inclination direction, and the continuous downward inclination shape of the conical guiding surface can cooperate with each other, so that the high viscosity condensing medium can slide outward in a predetermined direction at different circumferential positions.

[0123] During use, when the high-viscosity medium vapor inside the flame arrestor breather valve condenses and drips from different circumferential positions toward the valve disc 201b, the condensed medium first falls onto the guide valve cover 101, which is continuously arranged circumferentially around the guide rod clearance hole 103. Since the guide surface 101c extends continuously circumferentially around the guide rod clearance hole 103, the condensed medium can move from the center side to the outer periphery along the guide surface 101c at the corresponding position, regardless of which circumferential position it falls on.

[0124] When the flow guide valve cover 101 is further formed into a conical valve cover, the condensing medium can slide off the outer periphery of the flow guide valve cover 101 along the generatrix direction of the conical flow guide surface 101c. As a result, the flow guide valve cover 101 can form a circumferentially continuous, radially downward sloping flow guide path around the guide rod 201c, reducing the possibility of the condensing medium falling directly into the vicinity of the guide rod 201c or the center side of the valve disc 201b, thereby reducing the impact of high-viscosity condensing medium accumulation on the opening and closing stability of the valve disc 201b.

[0125] In this embodiment, the circumferentially continuous cover is mainly used to solve the problem of receiving and guiding the condensing medium at different circumferential positions, while the conical valve cover is mainly used to make the guiding surface 101c form a geometric guiding path that slopes continuously downward from the center to the outer periphery. The two work together to make the guiding valve cover 101 form a stable, continuous and clearly directional guiding structure around the guide rod 201c.

[0126] Example 6

[0127] Reference Figure 5 and Figure 6 This is the sixth embodiment of the present invention, which differs from the previous embodiments in that the flow guide valve cover 101 further includes a transition support portion 104 connected to the outside of the connecting portion 102. The transition support portion 104 is located between the connecting portion 102 and the cover portion in the flow guide valve cover 101 that forms the flow guide surface 101c. The transition support portion 104 is used to support the side of the flow guide surface 101c near the connecting portion 102, so that the flow guide surface 101c can maintain a downward tilting posture from the connecting portion 102 to the outer periphery of the flow guide valve cover 101.

[0128] Specifically, the connecting portion 102 is located on the central side of the flow guide valve cover 101, and the flow guide surface 101c extends downward from the outside of the connecting portion 102 to the outer periphery of the flow guide valve cover 101. The transition support portion 104 is located outside the connecting portion 102 and is connected to the cover portion forming the flow guide surface 101c. Through this structure, a stable force transmission relationship is formed between the connecting portion 102 and the cover portion forming the flow guide surface 101c in the flow guide valve cover 101. The side of the flow guide surface 101c near the connecting portion 102 is less prone to deformation affecting the downward direction due to condensate adhesion, valve disc 201b opening and closing vibration, temperature changes, or cleaning and maintenance operations.

[0129] The transition support portion 104 can be an annular support portion, a frustum-shaped transition portion, an arc-shaped transition portion, or multiple support ribs spaced circumferentially along the guide valve cover 101. The transition support portion 104 can be integrally formed with the connecting portion 102 and the guide valve cover 101, or it can be connected by welding, riveting, pressing, or screwing. Preferably, a smooth transition is formed between the transition support portion 104 and the connecting portion 102 and the cover portion of the guide valve cover 101 that forms the guide surface 101c, so as to reduce the accumulation dead angle of condensate on the outside of the connecting portion 102.

[0130] Under high-viscosity condensing medium conditions, if the guide surface 101c lacks stable support near the center, it may deform locally due to medium adhesion, vibration of the valve disc 201b during rise and fall, or long-term thermal cycling. This deformation may alter the downward tilt of the guide surface 101c, causing the condensing medium to stagnate near the connection 102. By providing the transition support 104, the guide surface 101c can stably maintain its downward tilting structure from the center to the outer periphery, thereby ensuring that the guiding effect formed by the guide base surface 101c1, the guide groove 106, and the guide tilt angle α in Examples 1 to 3 can be maintained for a long time.

[0131] Furthermore, the connecting part 102 includes a connecting sleeve 102a disposed around the guide rod clearance hole 103. The connecting sleeve 102a is used to fit over the guide rod 201c. The inner cavity of the connecting sleeve 102a communicates with the guide rod clearance hole 103, allowing the guide rod 201c to pass through the guide rod clearance hole 103 and enter the connecting sleeve 102a. After the connecting sleeve 102a is fitted over the guide rod 201c, it can use the guide rod 201c as a positioning reference to maintain the flow guide valve cover 101 in a predetermined position relative to the center side of the valve disc 201b.

[0132] The connecting sleeve 102a is provided with a locking element 102b. The locking element 102b passes through the connecting sleeve 102a and abuts against or connects to the guide rod 201c to restrict the axial movement of the connecting sleeve 102a relative to the guide rod 201c. The locking element 102b can be a locking screw, a set screw, a pin, a snap-fit ​​element, or other limiting element. For example, the side wall of the connecting sleeve 102a can be provided with a threaded hole, through which the locking screw abuts against the outer peripheral surface of the guide rod 201c; or, the guide rod 201c can be provided with a limiting groove, a limiting hole, or a limiting plane, and the locking element 102b cooperates with the limiting structure to restrict the axial movement of the connecting sleeve 102a along the guide rod 201c.

[0133] Through the cooperation of the connecting sleeve 102a and the locking member 102b, the flow guide valve cover assembly 100 can be stably installed at a predetermined position on the guide rod 201c. When the valve disc 201b rises and falls relative to the valve seat 201a, the flow guide valve cover assembly 100 can move synchronously with the guide rod 201c, preventing the flow guide valve cover 101 from axially shifting relative to the guide rod 201c due to airflow impact, media adhesion, or vibration of the valve disc 201b. In this way, the flow guide surface 101c can be continuously maintained at a predetermined flow guide position above the valve disc 201b.

[0134] In some embodiments, the outer periphery of the flow guide valve cover 101 is provided with a downwardly extending drip flange 105. The drip flange 105 is connected to the lower edge of the flow guide surface 101c, and the lower end of the drip flange 105 is lower than the lower edge of the flow guide surface 101c, so as to form a drip boundary for the condensing medium to detach from the flow guide valve cover 101.

[0135] Specifically, after the condensing medium moves from the center to the outer periphery along the guide surface 101c, it reaches the lower edge of the guide surface 101c. If this edge is just a normal straight edge, the high-viscosity condensing medium may adhere to or flow back along the outer periphery of the guide valve cover 101, or continue to linger on the lower surface of the guide valve cover 101. In this embodiment, by providing a downwardly extending drip flange 105 on the outer periphery of the guide valve cover 101, the condensing medium continues to move downward along the drip flange 105 after reaching the lower edge of the guide surface 101c, and a relatively clear detachment position is formed at the lower end of the drip flange 105.

[0136] The drip flange 105 can be continuously provided along the outer periphery of the flow guide valve cover 101, or it can be provided in segments along the outer periphery. Preferably, the drip flange 105 is continuously provided along the outer periphery of the flow guide valve cover 101 to form an annular or nearly annular drip boundary on the outer periphery of the flow guide valve cover 101. The drip flange 105 can be formed by bending, rolling, stamping, welding or integral molding.

[0137] During use, when the high-viscosity condensing medium falls onto the guide surface 101c, it moves from the center to the outer periphery of the guide valve cover 101 under the combined action of the guide base surface 101c1, the guide groove 106, and the guide angle α. The transition support 104 keeps the guide surface 101c in a stable downward tilt, the connecting sleeve 102a and the locking member 102b keep the guide valve cover assembly 100 in a stable installation position relative to the guide rod 201c, and the dripping flange 105 forms a clear dripping boundary on the outer periphery of the guide valve cover 101. Thus, the condensing medium can move along the path of "center side reception - downward tilting guidance - outer periphery dripping", reducing retention, adhesion, and backflow near the connecting part 102, on the surface of the guide surface 101c, and at the outer periphery of the guide valve cover 101.

[0138] In this embodiment, the transition support 104 is mainly used to maintain the structural posture of the guide surface 101c, the connecting sleeve 102a and the locking member 102b are mainly used to limit the axial movement of the guide valve cover assembly 100 relative to the guide rod 201c, and the dripping flange 105 is mainly used to limit the position where the condensing medium leaves the guide valve cover 101. The three components respectively ensure the stable flow guiding function of the guide valve cover assembly 100 under high viscosity condensing medium conditions from the aspects of support, positioning and dripping boundary.

[0139] Example 7

[0140] Reference Figure 7 This embodiment provides an anti-condensation flame arrestor breather valve. The anti-condensation flame arrestor breather valve includes the flow guide valve cover assembly 100 described in the above embodiment, and also includes a valve body 200, a flame arrestor assembly 300 disposed within the valve body 200, and at least one valve disc assembly 201 disposed within the valve body 200.

[0141] The valve disc assembly 201 includes a valve seat 201a, a valve disc 201b that is movable relative to the valve seat 201a, and a guide rod 201c connected to the valve disc 201b. At least one valve disc assembly 201 has a flow guide valve cover assembly 100 disposed above the valve disc 201b. The flow guide valve cover 101 in the flow guide valve cover assembly 100 is located above the valve disc 201b and is installed in conjunction with the guide rod 201c via a connecting portion 102, a guide rod clearance hole 103, a connecting sleeve 102a, or a locking member 102b.

[0142] Specifically, a valve cavity for gas flow is formed within the valve body 200. A flame arrestor 300 is disposed in the gas passage of the valve cavity to prevent the propagation of flame or deflagration while allowing gas to pass through. The valve disc 201b cooperates with the valve seat 201a to open or close the gas passage according to the pressure difference between the inside and outside of the storage tank. The guide rod 201c is connected to the valve disc 201b and is used to guide the valve disc 201b to rise and fall relative to the valve seat 201a, or to serve as a central positioning component during the rising and falling of the valve disc 201b.

[0143] Under conditions involving high-viscosity, easily condensable, or easily solidified media such as heavy oil, residual oil, sludge, and asphalt, the vapor of the medium entering the valve body 200 may condense on the inner wall of the valve body 200, near the flame arrestor assembly 300, above the valve disc 201b, near the guide rod 201c, and at other locations with lower temperatures or abrupt structural changes. If the condensed medium falls directly onto the center side of the valve disc assembly 201 or the area near the guide rod 201c after falling to the vicinity of the valve disc 201b, it is prone to adhesion, accumulation, or localized solidification, thereby affecting the opening, reseating, and sealing fit of the valve disc 201b relative to the valve seat 201a.

[0144] In this embodiment, a flow guide valve cover assembly 100 is disposed above the valve disc 201b of at least one valve disc assembly 201, so that the condensing medium contacts the flow guide valve cover 101 before falling onto the valve disc 201b. The flow guide valve cover 101 has a flow guide surface 101c that slopes downward from the center side to the outer periphery. The flow guide valve cover 101 includes a central region 101a located on its central side and an outer peripheral region 101b located on the outer periphery side of the central region 101a. The flow guide surface 101c extends downward from the central region 101a to the outer peripheral region 101b. The central region 101a and the outer peripheral region 101b are used to represent relative position regions on the flow guide valve cover 101, and there is a continuous transition between them. The flow guide surface 101c includes a flow guide base surface 101c1 and a flow guide groove 106 formed on the flow guide base surface 101c1. The ungrooved area of ​​the flow guiding base surface 101c1 has a low surface roughness factor, which can reduce the actual contact resistance between the high-viscosity condensing medium and the flow guiding base surface 101c1; the flow guiding groove 106 extends along the downward direction of the flow guiding base surface 101c1, which can guide the condensing medium to move in a predetermined direction.

[0145] Therefore, when the condensate formed inside the valve body 200 falls towards the valve disc assembly 201, after falling onto the guide valve cover 101, the condensate can move along the guide surface 101c from the center side near the guide rod 201c to the outer periphery of the guide valve cover 101, and is less likely to accumulate directly on the center side of the valve disc 201b or near the guide rod 201c. For the guide valve cover 101 equipped with a drip flange 105, after the condensate moves to the outer periphery of the guide valve cover 101, it can also detach from the guide valve cover 101 at the drip boundary formed by the drip flange 105, thereby further reducing the possibility of the condensate adhering to or flowing back along the outer edge of the guide valve cover 101.

[0146] One or more valve disc assemblies 201 can be disposed within the valve body 200. Multiple valve disc assemblies 201 can be used for pressure exhalation, vacuum intake, or other different opening and closing channels. A flow guide valve cover assembly 100 can be disposed above the valve disc 201b of one of the valve disc assemblies 201, or it can be disposed above the valve discs 201b of multiple valve disc assemblies 201. For valve disc assemblies 201 where condensate is more likely to accumulate or where opening and closing stability is more easily affected, it is preferable to provide the flow guide valve cover assembly 100 above its valve disc 201b.

[0147] The flow guide valve cover assembly 100 can be connected to the guide rod 201c, the valve disc 201b, or simultaneously form a positioning engagement with both the guide rod 201c and the valve disc 201b. By maintaining a relatively fixed positional relationship between the flow guide valve cover assembly 100 and the valve disc assembly 201, the flow guide valve cover 101 can be continuously maintained at a predetermined flow guiding position above the valve disc 201b, preventing the flow guide valve cover 101 from deviating from the vicinity of the guide rod 201c due to airflow impact, media adhesion, or vibration of the valve disc 201b during opening and closing.

[0148] In this embodiment, the flame arrestor assembly 300 and the valve disc assembly 201 together form the basic breathing and flame arrestor structure of the flame arrestor breather valve. The flow guide valve cover assembly 100 is disposed above the valve disc assembly 201 and is used to guide the high-viscosity condensate entering near the valve disc assembly 201. The flow guide valve cover assembly 100 does not replace the opening and closing sealing structure between the valve disc 201b and the valve seat 201a, nor does it change the flame arrestor function of the flame arrestor assembly 300. Instead, it receives and discharges the condensate before it may fall to the center side of the valve disc 201b.

[0149] During operation, when pressure changes within the storage tank cause the valve disc 201b to open or close relative to the valve seat 201a, the guide rod 201c moves up and down with the valve disc 201b or guides the movement of the valve disc 201b. After the condensate inside the valve body 200 falls onto the guide valve cover 101, it moves from the center to the outer periphery along the guide surface 101c under the combined action of the guide base surface 101c1, the guide groove 106, and the guide angle α. Once the condensate is guided to the area above the outer periphery of the valve disc 201b or the outer periphery of the guide valve cover 101, it is less likely to accumulate in the center of the valve disc 201b, near the guide rod 201c, or in the sealing area of ​​the valve seat 201a.

[0150] Therefore, the anti-condensation flame arrestor breather valve in this embodiment can improve the flow path of high-viscosity condensing medium above the valve disc 201b by improving the flow guide valve cover assembly 100 while maintaining the flame arrestor function of the flame arrestor assembly 300 and the opening and closing function of the valve disc assembly 201, thereby reducing the adverse effects of the condensing medium on the valve disc 201b's start-up, reseating, and sealing fit, and thus improving the working stability of the anti-condensation flame arrestor breather valve under high-viscosity, easily condensable, or easily solidifying medium conditions.

[0151] Example 8

[0152] Reference Figure 3 , Figure 5 , Figure 7 This is the eighth embodiment of the present invention, which differs from the previous embodiments in that: the flow guide valve cover assembly 100 is connected to the corresponding guide rod 201c or valve disc 201b, so as to rise and fall with the corresponding valve disc 201b. The outer periphery of the flow guide valve cover 101 is spaced apart from the inner wall of the valve body 200, so as to form a ventilation gap communicating with the flame arrestor assembly 300 on the outer periphery of the flow guide valve cover 101. An opening clearance space is formed between the upper part of the flow guide valve cover 101 and the inner wall of the valve body 200, and this opening clearance space is located above the movement path of the flow guide valve cover 101 when it rises with the valve disc 201b.

[0153] Specifically, the flow guide valve cover assembly 100 can be connected to the guide rod 201c via the connecting sleeve 102a and the locking member 102b, or it can be connected to the valve disc 201b via the connecting part 102, or it can simultaneously form a positioning engagement with both the guide rod 201c and the valve disc 201b. When the valve disc 201b opens or closes relative to the valve seat 201a due to pressure changes inside and outside the storage tank, the flow guide valve cover assembly 100 can rise and fall synchronously with the valve disc 201b, rather than remaining fixed relative to the valve body 200.

[0154] By raising and lowering the flow guide valve cover assembly 100 along with the valve disc 201b, the flow guide valve cover 101 can remain at a predetermined flow guiding position above the valve disc 201b during the opening and closing process. If the flow guide valve cover 101 is fixed relative to the valve body 200, while the valve disc 201b is raised and lowered relative to the valve body 200, the valve disc 201b may approach or touch the flow guide valve cover 101 during the opening process, or the relative position between the flow guide valve cover 101 and the valve disc 201b may change significantly, thereby affecting the flow guiding effect. In this embodiment, a follow-up connection is used to maintain a relatively stable positional relationship between the flow guide valve cover 101 and the valve disc 201b.

[0155] Meanwhile, the outer periphery of the flow guide valve cover 101 is spaced apart from the inner wall of the valve body 200, forming a ventilation gap. This ventilation gap is located on the outer periphery of the flow guide valve cover 101 and communicates with the gas passage where the flame arrestor assembly 300 is located. Thus, even after the flow guide valve cover assembly 100 is installed, the valve body 200 still retains a flow space for gas passage, preventing the flow guide valve cover 101 from obstructing or blocking the gas passage between the flame arrestor assembly 300 and the valve disc assembly 201.

[0156] During the operation of the breather valve, when the valve disc 201b is open, gas can enter or exit the valve body 200 through the opening channel formed between the valve disc 201b and the valve seat 201a, and communicate with the flame arrestor assembly 300 through the ventilation gap on the outer periphery of the guide valve cover 101. In other words, although the guide valve cover 101 is located above the valve disc 201b to receive and guide the condensate, its outer periphery does not make closed contact with the inner wall of the valve body 200, and therefore does not block the normal breathing channel of the breather valve.

[0157] Furthermore, an opening clearance space is formed between the upper part of the flow guide valve cover 101 and the inner wall of the valve body 200. This opening clearance space is located above the movement path of the flow guide valve cover 101 as it rises with the valve disc 201b. When the valve disc 201b is opened upward under pressure, the flow guide valve cover 101 moves upward synchronously with the valve disc 201b. The opening clearance space can provide accommodation for the upward movement of the flow guide valve cover 101, avoiding interference between the flow guide valve cover 101 and the inner wall of the valve body 200 before the valve disc 201b reaches the predetermined opening height.

[0158] For a weight-bearing flame arrestor breather valve, the weight of the valve disc 201b and its follower components affects the opening pressure and reseating state of the valve disc 201b. After the flow guide valve cover 101 is positioned above the valve disc 201b, its tilt angle, size, and weight all affect the internal space of the valve body 200 and the opening and closing performance of the valve disc 201b. Referring to the description of the flow guide tilt angle, height, and weight variations in Embodiment 3, the flow guide valve cover 101 cannot solely aim to increase the flow guide tilt angle; it must also consider the full opening stroke of the valve disc 201b, the internal ventilation space of the valve body 200, and the weight-bearing pressure setting.

[0159] Therefore, this embodiment, by setting a ventilation gap and an opening clearance space, ensures that the flow guide valve cover assembly 100, while performing its function of guiding the condensate medium, does not affect the basic ventilation function of the flame arrestor breather valve and the opening stroke of the valve disc 201b. The ventilation gap ensures that the outer periphery of the flow guide valve cover 101 still has a gas flow path, and the opening clearance space ensures that the flow guide valve cover 101 has sufficient movement space when it rises with the valve disc 201b.

[0160] During use, when a condensate forms inside the valve body 200, the condensate falls onto the guide valve cover 101 and moves from the center to the outer periphery along the guide surface 101c. It then detaches from the guide valve cover 101 at the outer periphery or at the drip edge 105. When pressure changes inside and outside the tank cause the valve disc 201b to open, the guide valve cover assembly 100 rises and falls synchronously with the valve disc 201b. The venting gap between the outer periphery of the guide valve cover 101 and the inner wall of the valve body 200 maintains gas communication, while the opening clearance space above the guide valve cover 101 accommodates its upward movement.

[0161] Therefore, the anti-condensation flame arrestor breather valve in this embodiment, after the flow guide valve cover assembly 100 is installed, can simultaneously meet three requirements: First, the flow guide valve cover 101 can maintain a stable relative position with the valve disc 201b to continuously receive and guide the condensate; second, a ventilation gap is retained on the outer periphery of the flow guide valve cover 101 to maintain gas flow between the flame arrestor assembly 300 and the valve disc assembly 201; third, an opening clearance space is formed above the flow guide valve cover 101 to avoid structural interference when the flow guide valve cover 101 rises with the valve disc 201b. The above structural coordination enables the flow guide valve cover assembly 100 to improve the flow path of the high-viscosity condensate without weakening the normal opening and closing and breathing performance of the anti-condensation flame arrestor breather valve.

[0162] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape and proportion of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise changed, and the nature or number or position of discrete elements may be altered or changed. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Therefore, the invention is not limited to the particular embodiments but extends to a variety of modifications that still fall within the scope of the appended claims.

[0163] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0164] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A flow guide valve cover, characterized in that: include, A guide surface that slopes downward from the center to the outer periphery (101c). The flow guiding surface (101c) includes a flow guiding base surface (101c1) and a flow guiding groove (106) formed on the flow guiding base surface (101c1). The surface roughness factor r1 of the ungrooved region of the flow guide base surface (101c1) is <1.60, where r1 is the ratio of the actual surface area of ​​the ungrooved region to the projected area of ​​the plane. The flow guide groove (106) extends along the downward direction of the flow guide base surface (101c1); The guide channel (106) includes multiple long grooves, which are spaced apart along the direction intersecting its length direction. The length direction of each groove extends along the guide surface (101c) from the high side to the low side, so as to form a plurality of grooved guide channels extending in the downward direction on the guide surface (101c). The area where the guide groove (106) is located forms a directional surface with a dominant direction. The surface spatial parameter Str3 of the directional surface is 0.10~0.25, and the dominant direction is consistent with the length direction of the long groove. The surface spatial parameter Str3 is used to characterize the directionality of the surface texture.

2. The flow guide valve cover according to claim 1, characterized in that: The guide surface (101c) forms a guide angle α with the horizontal plane. The guide angle α is not less than the critical slip angle ω0 of the condensing medium to be guided relative to the guide base surface (101c1) at a set working temperature, and the guide angle α is ≥30°.

3. A flow guide valve cover assembly, comprising the flow guide valve cover as described in claim 1 or 2, characterized in that: It also includes a connecting part (102) located at the center of the flow guide valve cover (101), the connecting part (102) having a guide rod clearance hole (103) for the guide rod (201c) of the flame arrester breathing valve to pass through; The flow guide surface (101c) extends downward from the outside of the connecting part (102) toward the outer periphery of the flow guide valve cover (101).

4. The flow guide valve cover assembly according to claim 3, characterized in that: The flow guide valve cover (101) is a cover that is continuously arranged circumferentially around the guide rod clearance hole (103); The guide surface (101c) extends continuously around the guide rod clearance hole (103) to form a continuous downward-sloping guide area on the outer periphery of the guide rod clearance hole (103).

5. The flow guide valve cover assembly according to claim 3 or 4, characterized in that: The flow guide valve cover (101) is a conical valve cover; The guide surface (101c) is a tapered guide surface that extends circumferentially around the guide rod clearance hole (103), and the tapered guide surface slopes continuously downward from the connecting part (102) to the outer periphery of the guide valve cover (101).

6. The flow guide valve cover assembly according to claim 3, characterized in that: The flow guide valve cover (101) also includes a transition support (104) connected to the outside of the connecting part (102), and the flow guide surface (101c) is located on the outer periphery of the transition support (104); The transition support (104) is connected between the connecting part (102) and the guide surface (101c) and supports the guide surface (101c) so that the guide surface (101c) is kept in a downward tilting posture from the connecting part (102) to the outer periphery.

7. The flow guide valve cover assembly according to claim 6, characterized in that: The connecting part (102) includes a connecting sleeve (102a) disposed around the guide rod clearance hole (103), the connecting sleeve (102a) being used to fit over the guide rod (201c); The connecting sleeve (102a) is provided with a locking member (102b), which passes through the connecting sleeve (102a) and abuts against or connects to the guide rod (201c) to restrict the axial movement of the connecting sleeve (102a) relative to the guide rod (201c).

8. The flow guide valve cover assembly according to any one of claims 3, 4, 6, and 7, characterized in that: The outer periphery of the flow guide valve cover (101) is provided with a downwardly extending drip flange (105). The dripping flange (105) is connected to the lower edge of the guide surface (101c), and the lower end of the dripping flange (105) is lower than the lower edge of the guide surface (101c) to form a dripping boundary for the condensing medium to escape from the guide valve cover (101).

9. A flame-retardant breather valve for preventing solidification, comprising the flow guide valve cover assembly as described in any one of claims 3 to 8, characterized in that: It also includes a valve body (200), a flame arrestor assembly (300) disposed within the valve body (200), and at least one valve disc assembly (201) disposed within the valve body (200). The valve disc assembly (201) includes a valve seat (201a), a valve disc (201b) that is movable relative to the valve seat (201a), and a guide rod (201c) connected to the valve disc (201b). The flow guide valve cover assembly (100) is disposed above the valve disc (201b) of at least one of the valve disc assemblies (201).

10. The anti-condensation flame arrestor breather valve according to claim 9, characterized in that: The flow guide valve cover assembly (100) is connected to the corresponding guide rod (201c) or the valve disc (201b) to move up and down with the corresponding valve disc (201b); The outer periphery of the flow guide valve cover (101) is spaced apart from the inner wall of the valve body (200) to form a ventilation gap communicating with the flame arrestor assembly (300) on the outer periphery of the flow guide valve cover (101). An opening clearance space is formed between the upper part of the flow guide valve cover (101) and the inner wall of the valve body (200), and the opening clearance space is located above the movement path of the flow guide valve cover (101) as it rises with the valve disc (201b).

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