Novel on-off pressure reducing valve

Abstract

This utility model discloses a novel on / off pressure reducing valve, relating to the field of pressure reducing valve technology. The novel on / off pressure reducing valve includes a valve body and a switching valve diaphragm. The valve body has a medium inlet, a medium outlet, and a main valve port connecting the medium inlet and the medium outlet. The switching valve diaphragm includes a diaphragm body, a diaphragm limiting portion, and a flexibly connected diaphragm deflection portion between the diaphragm body and the diaphragm limiting portion. The diaphragm limiting portion is circumferentially disposed outside the diaphragm body and fixedly connected to the valve body. The diaphragm body has a sealing boss protruding toward the main valve port, which is used to block or open the main valve port. The technical solution provided by this utility model can improve the sealing reliability of the switching valve diaphragm to the main valve port.

Description

Technical Field

[0001] This utility model relates to the field of pressure reducing valve technology, and in particular to a novel on / off pressure reducing valve. Background Technology

[0002] Most pressure reducing valves on the market currently use soft rubber seals to achieve their sealing function. This design mainly utilizes the elastic deformation properties of soft rubber to achieve a tight fit with the sealing surface, thereby achieving a reliable seal for the pressure reducing valve.

[0003] Typically, soft rubber seals fit snugly against the sealing surface with their planar sealing structure. However, under continuous pressure, they are prone to gradual deformation, forming a reverse concave surface. This reverse concave surface will become more and more obvious over time, thus seriously affecting the sealing performance.

[0004] Furthermore, when the pressure reducing valve is opened, the medium needs to flow out from the valve port. Due to the special nature of the soft rubber flat sealing structure, the flow path of the medium through the valve port is relatively gentle. This gentle flow condition results in a slow change in the flow velocity of the medium near the valve port, making it difficult to generate sufficient turbulence to remove impurities that may adhere to the valve port. In fact, the accumulated impurities may eventually block the valve port or form gaps at the sealing surface, thereby causing leakage and affecting the normal operation of the system. Utility Model Content

[0005] The main objective of this invention is to propose a novel switching pressure reducing valve, which aims to improve the sealing reliability of the switching valve diaphragm to the main valve port.

[0006] To achieve the above objectives, the present invention proposes a novel on / off pressure reducing valve, comprising:

[0007] The valve body has a medium inlet, a medium outlet, and a main valve port connecting the medium inlet and the medium outlet;

[0008] A switching valve diaphragm includes a diaphragm body, a diaphragm limiting portion, and a diaphragm deflection portion flexibly connected between the diaphragm body and the diaphragm limiting portion. The diaphragm limiting portion is arranged around the diaphragm body and fixedly connected to the valve body. The diaphragm body has a sealing boss protruding toward the main valve port, and the sealing boss is used to block or open the main valve port.

[0009] In one embodiment, the outer annular surface of the sealing boss is tapered toward the main valve port.

[0010] In one embodiment, the end face of the sealing boss at least partially abuts against the surface where the main valve port is located.

[0011] In one embodiment, the novel switch pressure reducing valve further includes a valve diaphragm sleeve that is limited and installed in the valve body, a support platform protruding from the valve body, and the diaphragm limiting part being clamped between the support platform and the valve diaphragm sleeve.

[0012] In one embodiment, a limiting step is formed on the inner wall surface of the valve body, and the valve diaphragm sleeve includes a sleeve body and an annular protrusion. One end of the sleeve body abuts against the diaphragm limiting portion, and the other end of the sleeve body is provided with the annular protrusion, which rests on the limiting step.

[0013] In one embodiment, the valve body has an opening opposite to the main valve port, and the novel switch pressure reducing valve further includes a valve cover covering the opening, with a sealing ring sandwiched between the other end of the sleeve body and the valve cover.

[0014] In one embodiment, a mounting groove is formed on the support platform for the membrane limiting portion to be inserted;

[0015] And / or, the membrane limiting portion is provided with a protrusion extending toward the valve diaphragm sleeve.

[0016] In one embodiment, the inner cavity of the valve body includes a first cavity, a second cavity, and a third cavity, wherein the first cavity is connected to the medium inlet, and the third cavity is connected to the main valve port and the medium outlet;

[0017] The membrane body is also provided with a bypass hole and a pilot hole. The second cavity is connected to the first cavity through the bypass hole and is also connected to the main valve port through the pilot hole.

[0018] In one embodiment, the membrane body is further provided with a sealing lip extending circumferentially along the pilot hole.

[0019] In one embodiment, the novel switching pressure reducing valve further includes a core control mechanism for blocking or opening the pilot orifice;

[0020] And / or, the novel switch pressure reducing valve further includes a valve core and a pressure reducing assembly, wherein the sealing end of the valve core extends into the pilot hole, and its connecting end is fixedly connected to the pressure reducing assembly. When the pressure reducing assembly is deformed under pressure, the sealing end is driven to open or block the pilot hole through the connecting end.

[0021] In the technical solution of this utility model, a sealing boss is formed on the surface of the switching valve diaphragm facing the main valve port. The sealing boss is specifically formed on the diaphragm body of the switching valve diaphragm. When the switching pressure reducing valve is in the closed state, the diaphragm body is sealed to the main valve port through the sealing boss to block the main valve port. When the switching pressure reducing valve is in the open state, there is a flow gap between the sealing boss and the plane where the main valve port is located to ensure that the medium flows through the main valve port to the medium outlet.

[0022] Thus, compared to the diaphragm of the switching valve sealing the main valve port with a planar sealing structure, the setting of the sealing boss can enhance the structural stability of the switching valve diaphragm, reduce the risk of deformation, and change the flow velocity of the medium near the main valve port. The resulting turbulence can clean impurities in the diaphragm body and the main valve port. At the same time, it reduces the contact area between the medium and the diaphragm body when the medium flows through the switching valve diaphragm, which helps to increase the difficulty for impurities carried by the medium to adhere to the structure near the main valve port. This improves the sealing reliability of the sealing boss to the main valve port and ensures the safe use of the switching pressure reducing valve. Attached Figure Description

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

[0024] Figure 1 A schematic diagram of the structure of an embodiment of the novel on / off pressure reducing valve provided by this utility model;

[0025] Figure 2 for Figure 1 Side view of the new type of on / off pressure reducing valve;

[0026] Figure 3 for Figure 2 A cross-sectional view of the new type of switch pressure reducing valve, cut along section line AA;

[0027] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0028] Figure 5 This is a schematic diagram showing the flow direction of the medium between the diaphragm of the switching valve and the main valve port.

[0029] Figure 6 for Figure 3 A magnified view of a section at point C;

[0030] Figure 7 This is a schematic diagram of the diaphragm structure of a switching valve;

[0031] Figure 8 for Figure 7 A cross-sectional view of the diaphragm of the switching valve;

[0032] Figure 9 This is a schematic diagram of the valve diaphragm sleeve.

[0033] Explanation of icon numbers:

[0034] 11. Valve body; 111. Medium inlet; 112. Medium outlet; 113. Main valve port; 114. Opening; 121. First chamber; 122. Second chamber; 123. Third chamber; 13. Support platform; 131. Mounting groove; 14. Limiting step; 15. Valve cover; 16. Sealing ring;

[0035] 20. Switch valve diaphragm; 21. Diaphragm body; 211. Bypass hole; 212. Pilot hole; 22. Diaphragm limiting part; 23. Diaphragm flexure part; 24. Sealing boss; 241. Outer annular surface; 25. Sealing lip; 26. Protrusion;

[0036] 30. Valve diaphragm sleeve; 31. Sleeve body; 32. Ring protrusion;

[0037] 40. Iron core control mechanism; 41. Moving iron core; 411. Annular step; 42. Coil frame; 43. Magnetic conductive assembly; 44. Elastic element;

[0038] 50. Valve core; 51. Sealing end; 52. Connecting end;

[0039] 60. Pressure-reducing assembly; 61. Pressure-reducing diaphragm; 62. Compression spring;

[0040] 70. Guide and limiting structure.

[0041] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0043] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0044] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0045] Most pressure reducing valves on the market currently use soft rubber seals to achieve their sealing function. This design mainly utilizes the elastic deformation properties of soft rubber to achieve a tight fit with the sealing surface, thereby achieving a reliable seal for the pressure reducing valve.

[0046] Typically, soft rubber seals fit snugly against the sealing surface with their planar sealing structure. However, under continuous pressure, they are prone to gradual deformation, forming a reverse concave surface. This reverse concave surface will become more and more obvious over time, thus seriously affecting the sealing performance.

[0047] Furthermore, when the pressure reducing valve is opened, the medium needs to flow out from the valve port. Due to the special nature of the soft rubber flat sealing structure, the flow path of the medium through the valve port is relatively gentle. This gentle flow condition results in a slow change in the flow velocity of the medium near the valve port, making it difficult to generate sufficient turbulence to remove impurities that may adhere to the valve port. In fact, the accumulated impurities may eventually block the valve port or form gaps at the sealing surface, thereby causing leakage and affecting the normal operation of the system.

[0048] To solve this technical problem, this utility model proposes a switch pressure reducing valve.

[0049] Please see Figures 1 to 9In one embodiment of this utility model, the switching pressure reducing valve includes a valve body 11 and a switching valve diaphragm 20. The valve body 11 has a medium inlet 111, a medium outlet 112, and a main valve port 113 communicating between the medium inlet 111 and the medium outlet 112. The switching valve diaphragm 20 includes a diaphragm body portion 21, a diaphragm limiting portion 22, and a diaphragm deflection portion 23 flexibly connected between the diaphragm body portion 21 and the diaphragm limiting portion 22. The diaphragm limiting portion 22 is arranged around the diaphragm body portion 21 and fixedly connected to the valve body 11. The diaphragm body portion 21 has a sealing boss 24 protruding toward the main valve port 113. The sealing boss 24 is used to block or open the main valve port 113. This improves the sealing reliability of the switching valve diaphragm 20 to the main valve port 113, thereby enhancing the safety of the switching pressure reducing valve.

[0050] In the technical solution of this utility model, a sealing boss 24 is formed on the surface of the switching valve diaphragm 20 facing the main valve port 113. The sealing boss 24 is specifically formed on the diaphragm body 21 of the switching valve diaphragm 20. When the switching pressure reducing valve is in the closed state, the diaphragm body 21 is sealed to the main valve port 113 through the sealing boss 24 to block the main valve port 113. When the switching pressure reducing valve is in the open state, there is a flow gap between the sealing boss 24 and the plane where the main valve port 113 is located to ensure that the medium flows through the main valve port 113 to the medium outlet 112.

[0051] Thus, compared to the switch valve diaphragm 20 sealing the main valve port 113 with a planar sealing structure, the setting of the sealing boss 24 can enhance the structural stability of the switch valve diaphragm 20, reduce the risk of deformation, and change the flow velocity of the medium near the main valve port 113. This allows the generated turbulence to clean impurities at the diaphragm body 21 and the main valve port 113. At the same time, it reduces the contact area between the medium and the diaphragm body 21 when the medium flows through the switch valve diaphragm 20, which helps to increase the difficulty for impurities carried by the medium to adhere to the structure near the main valve port 113. This, in turn, improves the sealing reliability of the sealing boss 24 to the main valve port 113, ensuring the safe use of the switch pressure reducing valve.

[0052] It should be emphasized that during the opening or closing of the main valve port 113, due to the setting of the sealing boss 24, such as Figure 5 As shown, the flow trajectory of the medium flowing between the switching valve diaphragm 20 and the main valve port 113 will change to generate turbulence. The resulting turbulent medium can self-clean the main valve port 113 and the corresponding switching valve diaphragm 20 to a great extent, reducing the adhesion of impurities to the surface of the main valve port 113 and the sealing boss 24, which would cause gaps to form at the sealing position between the switching valve diaphragm 20 and the main valve port 113, resulting in the risk of leakage. This improves the sealing reliability of the sealing boss 24 to the main valve port 113 and ensures the safe use of the new switching pressure reducing valve.

[0053] Specifically, the switching valve diaphragm 20 includes a membrane body 21, a membrane flexibility portion 23, and a membrane limiting portion 22 connected sequentially from the inside to the outside. The membrane body 21, membrane flexibility portion 23, and membrane limiting portion 22 are integral components made of a material with elastic deformation capabilities. Specifically, the switching valve diaphragm 20 is fixed near the main valve port 113 through the limiting engagement of the membrane limiting portion 22 with the valve body 11, ensuring that the sealing boss 24 of the membrane body 21 can align with the main valve port 113 and can seal against the plane of the main valve port 113 through its end face, thus completing the sealing of the main valve port 113 by the switching pressure reducing valve in the closed state. When there is a pressure difference between the two chambers of the switching valve diaphragm 20, the flexible deformation of the membrane flexibility portion 23 adapts to the lifting and lowering movement of the membrane body 21 relative to the main valve port 113, ensuring the reliability of the switching valve diaphragm 20 and the reliability of sealing or opening the main valve port 113.

[0054] Please see Figures 3 to 4 In this embodiment of the invention, the outer annular surface 241 of the sealing boss 24 is tapered toward the main valve port 113. This configuration complicates the flow path of the medium as it passes through the main valve port 113, allowing for rapid changes in the medium's velocity near the main valve port 113. This generates sufficient turbulence to remove impurities that may adhere to the vicinity of the main valve port 113, such as impurities located on the membrane limiting portion 22 and / or on the plane where the main valve port 113 is located. This improves the self-cleaning effect of the pressure reducing valve at the main valve port 113, enhances the sealing reliability of the sealing boss 24 to the main valve port 113, and ensures the safe use of the pressure reducing valve. Furthermore, it guides the medium into the main valve port 113, contributing to improved efficiency.

[0055] Please see Figure 4 In this embodiment of the invention, at least part of the end face of the sealing boss 24 abuts against the surface of the main valve port 113. This ensures the sealing effect of the sealing boss 24 on the main valve port 113, increases the effective connection area between the sealing boss 24 and the membrane body 21, improves the connection strength between the sealing boss 24 and the membrane body 21, and reduces the risk of deformation of the switching valve diaphragm 20 at the sealing boss 24. However, in other embodiments, the sealing boss 24 may also be partially inserted into the main valve port 113.

[0056] Please see Figures 3 to 6In an embodiment of this utility model, the switch pressure reducing valve further includes a valve diaphragm sleeve 30 that is limited and installed inside the valve body 11. A support platform 13 protrudes from the valve body 11. The diaphragm limiting part 22 is clamped between the support platform 13 and the valve diaphragm sleeve 30. Thus, by clamping the diaphragm limiting part 22 between the support platform 13 and the valve diaphragm sleeve 30, the switch valve diaphragm 20 can be fixed inside the valve body 11, and the sealing boss 24 on the diaphragm body 21 is aligned with the main valve port 113, ensuring that the sealing boss 24 blocks or allows the main valve port 113 to open.

[0057] The valve diaphragm sleeve 30 is provided with a chamber for the membrane body 21 to move. The inner wall of the chamber is flared near the membrane body 21. This not only does not affect the pressure of the valve diaphragm sleeve 30 on the membrane limiting part 22, but also provides deformable space for the adaptive deformation of the membrane flexure part 23 during the lifting and lowering of the membrane body 21. This reduces the risk of interference between the membrane flexure part 23 and the valve diaphragm sleeve 30, improves the reliability of the opening and closing of the switch valve diaphragm 20 to the main valve port 113, and extends the service life of the switch valve diaphragm 20.

[0058] Please see Figure 9 In this embodiment of the present invention, a limiting step 14 is formed on the inner wall surface of the valve body 11. The valve diaphragm sleeve 30 includes a sleeve body 31 and an annular protrusion 32. One end of the sleeve body 31 presses against the diaphragm limiting part 22, and the other end of the sleeve body 31 is provided with the annular protrusion 32. The annular protrusion 32 rests on the limiting step 14. With this arrangement, the displacement of the valve diaphragm sleeve 30 in the valve body 11 can be effectively controlled through the limiting cooperation of the limiting step 14 and the annular protrusion 32. Then, the diaphragm limiting part 22 is clamped between the support platform 13 and the valve diaphragm sleeve 30 by the sleeve body 31. While ensuring the clamping effect of the support platform 13 and the valve diaphragm sleeve 30 on the diaphragm limiting part 22, the risk of the diaphragm limiting part 22 being over-compressed and deformed due to excessive pressure of the valve diaphragm sleeve 30 on the diaphragm limiting part 22 is effectively reduced. This improves the installation reliability of the diaphragm limiting part 22 in the valve body 11, improves the structural stability of the diaphragm limiting part 22, and extends the service life of the switching valve diaphragm 20. The annular protrusion 32 can be a complete annular protrusion or an annular protrusion with a break or a notch.

[0059] Optionally, in an embodiment of the present invention, the support platform 13 is provided with an installation groove 131 for the membrane limiting part 22 to be embedded in; by installing the membrane limiting part 22 in the installation groove 131, and with the pressure of the sleeve body 31, the membrane limiting part 22 can be firmly fixed on the support platform 13, effectively increasing the difficulty of the membrane limiting part 22 detaching from the support platform 13, thereby improving the assembly stability of the switch valve diaphragm 20.

[0060] Please refer to Figure 4 and Figure 7In an embodiment of this utility model, the membrane limiting portion 22 is provided with a protrusion 26 extending toward the valve diaphragm sleeve 30. This arrangement helps to increase the effective contact area between the switching valve diaphragm 20 and the sleeve body 31, thereby improving the sealing performance of the valve diaphragm sleeve 30 and the switching valve diaphragm 20 at the membrane limiting portion 22. This reduces the possibility of leakage caused by the medium flowing from the connection between the membrane limiting portion 22 and the sleeve body 31 to the valve body 11 and the valve diaphragm sleeve 30, thus improving the safety of the switching pressure reducing valve. At least one protrusion 26 may be provided at radial intervals along the switching valve diaphragm 20.

[0061] Please see Figure 6 In an embodiment of this utility model, the valve body 11 has an opening 114 opposite to the main valve port 113. The switching pressure reducing valve also includes a valve cover 15 covering the opening 114. A sealing ring 16 is sandwiched between the other end of the sleeve body 31 and the valve cover 15. Thus, by interfering with the valve cover 15 and the valve diaphragm sleeve 30, the sealing ring 16 helps improve the overall sealing performance of the switching valve diaphragm 20, reduces the possibility of media leakage, and improves the safety of the switching valve diaphragm 20. Specifically, the sealing ring 16 can be a sealing gasket adapted to the gap between the valve cover 15 and the valve diaphragm sleeve 30, and its material includes, but is not limited to, rubber and silicone.

[0062] Since the valve diaphragm sleeve 30 and the valve body 11 are assembled through the limiting engagement of the annular protrusion 32 and the limiting step 14, the force applied by the valve cover 15 to the valve diaphragm sleeve 30 will not cause the valve diaphragm sleeve 30 to move further downward, thus avoiding the situation of excessive compression of the diaphragm limiting part 22. Compared with the pressure applied to the diaphragm limiting part 22 by the valve cover 15, the limiting structure of the diaphragm limiting part 22 is relatively independent from the limiting structure of the sealing ring 16 and does not affect each other, thereby improving the overall reliability and service life of the switch pressure reducing valve.

[0063] Please see Figures 3 to 4 , Figure 8 In an embodiment of this utility model, the inner cavity of the valve body 11 includes a first cavity 121, a second cavity 122 and a third cavity 123. The first cavity 121 is connected to the medium inlet 111, and the third cavity 123 is connected to the main valve port 113 and the medium outlet 112.

[0064] The membrane body 21 is also provided with a bypass hole 211 and a pilot hole 212. The second cavity 122 is connected to the first cavity 121 through the bypass hole 211 and is also connected to the main valve port 113 through the pilot hole 212.

[0065] Understandably, the switch pressure reducing valve also includes a core control mechanism 40, which is used to block or open the pilot hole 212. The switch pressure reducing valve can be an electromagnetic switch type pressure reducing valve. The core control mechanism 40 includes a moving core 41 and a coil frame 42. The moving core 41 is movably disposed in the coil frame 42. The coil frame 42 passes through the valve cover 15 and extends into the second chamber 122 through the opening 114 of the valve body 11. At this time, the coil frame 42 can be sealed to the valve body 11 through the sealing ring 16. The coil frame 42 is also provided with a magnetic conductive component 43, which forms an electromagnetic circuit for pulling the moving core 41, so as to realize the magnetic driving of the moving core 41 to approach or move away from the switch valve diaphragm 20, thereby reliably blocking or opening the pilot hole 212. To ensure stable operation of the moving iron core 41, an annular step 411 is provided on the moving iron core 41 for mounting the elastic element 44. The other end of the elastic element 44 abuts against the coil frame 42, ensuring that the elastic force of the elastic element 44 acts between the moving iron core 41 and the coil frame 42. The elastic element 44 can be a spring or a rubber cylinder.

[0066] Specifically, when the pressure reducing valve is in the closed state, the moving iron core 41 closes the pilot hole 212. At this time, the first chamber 121 and the second chamber 122 are connected through the bypass hole 211, so that the pressure of the first chamber 121 and the second chamber 122 are balanced. When the pressure reducing valve is switched to the working state, the moving iron core 41 opens the pilot hole 212 under the action of magnetic force. At this time, the second chamber 122 is depressurized through the pilot hole 212, resulting in a pressure difference between the first chamber 121 and the second chamber 122. This allows the membrane body 21 to move away from the main valve port 113, so that the first chamber 121 and the third chamber 123 are connected through the gap at the main valve port 113. During this process, part of the medium at the medium inlet 111 enters the third chamber 123 through the main valve port 113, and the other part enters the second chamber 122 through the bypass hole 211, and then enters the third chamber 123 through the pilot hole 212 and the main valve port 113 in sequence.

[0067] The bypass hole 211 has a smaller diameter than the pilot hole 212. By limiting its parameters and coordinating with the structural characteristics of the switching valve diaphragm 20, it effectively slows down the medium flow rate and slowly opens and closes the main valve port 113, thereby reducing or eliminating the impact of water hammer on the internal structure of the switching pressure reducing valve and improving the safety and service life of the switching pressure reducing valve.

[0068] Please refer to Figure 8In an embodiment of this utility model, the membrane body 21 is further provided with a sealing lip 25 extending circumferentially along the pilot hole 212. The sealing lip 25 protrudes from the end face of the membrane body 21 and is annular. When the moving iron core 41 presses against the membrane body 21, the addition of the sealing lip 25, based on the interference fit between the moving iron core 41 and the surface of the main valve port 113, helps to increase the contact area between the switching valve diaphragm 20 and the moving iron core 41, thereby enhancing the sealing effect of the moving iron core 41 on the main valve port 113. In addition, the surface of the membrane body 21 facing the moving iron core 41 can be an arc surface recessed in the direction protruding towards the moving iron core 41, which also helps to increase the contact area between the switching valve diaphragm 20 and the moving iron core 41.

[0069] Please refer to Figure 3 In an embodiment of this utility model, the switch pressure reducing valve further includes a valve core 50 and a pressure reducing assembly 60. The sealing end 51 of the valve core 50 extends into the pilot hole 212, and its connecting end 52 is fixedly connected to the pressure reducing assembly 60. When the pressure reducing assembly 60 is deformed under pressure, the sealing end 51 is driven by the connecting end 52 to open or block the pilot hole 212. It can be understood that during the process of opening the main valve port 113 and the medium entering the third chamber 123, the valve core 50 moves away from the main valve port 113 and blocks the pilot hole 212 when its sealing end 51 abuts against the edge of the pilot hole 212. At the same time, the movement of the valve core 50 can further compress the pressure reducing assembly 60, thereby achieving automatic pressure balance through the deformation of the pressure reducing assembly 60, and promoting the stable pressure of the medium outlet 112.

[0070] The pressure reducing assembly 60 includes a pressure reducing diaphragm 61 and a compression spring 62. The side of the pressure reducing diaphragm 61 facing away from the compression spring 62 is provided with a fixing groove for the fixing connection end 52. The fixing groove enables the connection between the pressure reducing diaphragm 61 and the valve core 50. Then, through the elastic characteristics and feedback mechanism of the pressure reducing diaphragm 61, the opening degree of the valve core 50 is effectively controlled. Combined with the compression capacity of the compression spring 62, the pressure at the medium outlet 112 is effectively stabilized.

[0071] The compression spring 62 is located in the sealed cavity formed by the connection between the pressure reducing diaphragm 61 and the valve body 11. It can effectively isolate the medium and prevent corrosive media from damaging the internal structure of the sealed cavity and causing leakage, thereby improving the service life of the switch pressure reducing valve.

[0072] In addition, a guide limiting structure 70 is provided inside the valve body 11 between the main valve port 113 and the pressure reducing assembly 60. Without affecting the flow of the medium, the guide limiting structure 70 is provided with a guide limiting hole for the valve core 50 to pass through. In this way, the movement trend of the valve core 50 is effectively constrained, preventing the valve core 50 from moving radially or swinging, ensuring that the valve core 50 can move smoothly and axially, reducing wear and extending service life.

[0073] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A novel on-off pressure reducing valve characterized by, include: The valve body has a medium inlet, a medium outlet, and a main valve port connecting the medium inlet and the medium outlet; and A switching valve diaphragm includes a diaphragm body, a diaphragm limiting portion, and a diaphragm deflection portion flexibly connected between the diaphragm body and the diaphragm limiting portion. The diaphragm limiting portion is arranged around the diaphragm body and fixedly connected to the valve body. The diaphragm body has a sealing boss protruding toward the main valve port, and the sealing boss is used to block or open the main valve port.

2. The novel on-off pressure reducing valve according to claim 1, wherein The outer ring surface of the sealing boss is tapered toward the main valve port.

3. The novel on-off pressure reducing valve according to claim 1, wherein The end face of the sealing boss at least partially abuts against the surface where the main valve port is located.

4. The novel on-off pressure reducing valve according to claim 1, wherein The novel switch pressure reducing valve also includes a valve diaphragm sleeve that is limited and installed in the valve body. A support platform is protruding from the valve body, and the diaphragm limiting part is clamped between the support platform and the valve diaphragm sleeve.

5. The novel on-off pressure reducing valve according to claim 4, wherein The inner wall surface of the valve body forms a limiting step. The valve diaphragm sleeve includes a sleeve body and an annular protrusion. One end of the sleeve body abuts against the diaphragm limiting part, and the other end of the sleeve body has the annular protrusion protruding. The annular protrusion rests on the limiting step.

6. The novel on-off pressure reducing valve according to claim 5, wherein The valve body has an opening opposite to the main valve port. The novel switch pressure reducing valve also includes a valve cover covering the opening, and a sealing ring is sandwiched between the other end of the sleeve body and the valve cover.

7. The novel on-off pressure reducing valve according to claim 4, wherein The support platform has a mounting groove for the membrane limiting part to be inserted; And / or, the membrane limiting portion is provided with a protrusion extending toward the valve diaphragm sleeve.

8. The novel on-off pressure reducing valve according to any one of claims 1 to 7, characterized by The valve body has an inner cavity including a first cavity, a second cavity, and a third cavity. The first cavity is connected to the medium inlet, and the third cavity is connected to the main valve port and the medium outlet. The membrane body is also provided with a bypass hole and a pilot hole. The second cavity is connected to the first cavity through the bypass hole and is also connected to the main valve port through the pilot hole.

9. The novel on-off pressure reducing valve according to claim 8, wherein The membrane body is also provided with a sealing lip extending circumferentially along the pilot hole.

10. The novel on-off pressure reducing valve according to claim 9, wherein The novel switch pressure reducing valve also includes an iron core control mechanism, which is used to block or open the pilot hole; And / or, the novel switch pressure reducing valve further includes a valve core and a pressure reducing assembly, wherein the sealing end of the valve core extends into the pilot hole, and its connecting end is fixedly connected to the pressure reducing assembly. When the pressure reducing assembly is deformed under pressure, the sealing end is driven to open or block the pilot hole through the connecting end.

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