Sight glass fluorine-lined check valve

Abstract

The utility model discloses a fluorine lining check valve of sight mirror, including valve body and valve core, is equipped with fluorine lining layer on the valve body inner wall, is equipped with the inlet channel, the middle cavity and the outlet channel of intercommunication in proper order in the valve body, and the valve core is movably arranged in the middle cavity, and the upper and lower both ends position of valve body corresponding middle cavity is equipped with an observation port respectively, and the observation port is installed with transparent sight mirror, the front and back both sides of middle cavity inner wall are symmetrically equipped with guide block, and the side of guide block is equipped with guide groove close to valve core, and the front and back both sides of valve core are slidably connected with the guide groove of two guide blocks respectively, and the valve core has the check position of abutting the inner end of inlet channel and the lead-through position of separating the inner end of inlet channel when being movable, and the end of guide block close to outlet channel still is equipped with the limiting boss for constituting the limiting of valve core and making valve core unable to abut the inner end of outlet channel. The utility model not only can observe the condition of valve inside at any time, but also has clear observation field, is not blocked, and greatly promotes user experience.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a fluoropolymer-lined check valve for sight glasses. Background Technology

[0002] Currently, most fluoropolymer-lined sight glasses and check valves in China are designed, manufactured, and used separately as two types of valves. Fluoropolymer-lined sight glasses are used to observe the flow rate and color changes of unit fluids in pipelines or equipment, and to directly monitor chemical process flows. Check valves are automatic valves used in pipeline systems that open when the medium flows in the forward direction and close when it flows backward. Their main function is to prevent backflow of the medium, reverse rotation of pumps and drive machinery, and to prevent water hammer waves generated when pumps and drive motors suddenly stop running, thereby reducing damage to the pipeline system.

[0003] To facilitate observation of fluid flow within a check valve, Chinese utility model patent application CN201320620007.4 discloses a check valve equipped with a sight glass. This valve includes a valve body, a valve seat, and a valve core. The valve body has a left flow channel and a right flow channel, and an observation chamber with observation plates on both sides. The observation chamber communicates with the left and right flow channels. The valve core, which is spherical, is located within the observation chamber. The valve seat is located between the right flow channel and the observation chamber, forming a sealing pair with the spherical valve core. This check valve uses four limiting strips evenly distributed around the valve core within the observation chamber to restrict its movement, ensuring it moves along a designated trajectory. However, in this structure, the upper and lower limiting strips are positioned directly in front of the observation plates, obstructing the field of view and resulting in a poor user experience. Therefore, it is necessary to improve existing fluoropolymer-lined check valves with sight glasses. Utility Model Content

[0004] The purpose of this invention is to provide a fluoropolymer-lined check valve with a sight glass. This invention not only allows for real-time observation of the valve's internal condition, but also provides a clear and unobstructed field of view, greatly enhancing the user experience.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a fluoropolymer-lined check valve, comprising a valve body and a valve core, wherein the inner wall of the valve body is provided with a fluoropolymer lining, and the valve body is provided with an inlet channel, a middle cavity, and an outlet channel connected in sequence, wherein the valve core is movably disposed in the middle cavity, and the valve body is provided with an observation port at the upper and lower ends corresponding to the middle cavity, wherein a transparent sight glass is installed on the observation port; guide blocks are symmetrically arranged on the front and rear sides of the inner wall of the middle cavity, and a guide groove is provided on the side of the guide block near the valve core, wherein the extension direction of the guide groove is parallel to the extension direction of the inlet channel, and the front and rear sides of the valve core are respectively slidably engaged with the guide grooves of the two guide blocks, wherein when the valve core moves, it has a check position that is pressed against the inner end of the inlet channel and a conduction position that is disengaged from the inner end of the inlet channel, and a limiting protrusion is provided at the end of the guide block near the outlet channel to limit the valve core so that the valve core cannot press against the inner end of the outlet channel.

[0006] By adopting the above technical solution, two guide blocks, one at the front and one at the back, hold the valve core tightly. The guide grooves on the guide blocks restrict the vertical movement of the valve core, allowing it to move towards or away from the inlet channel under the influence of water flow, thus achieving valve check or opening. This eliminates the obstruction at the top and bottom of the valve core, allowing for a clear and unobstructed view of the fluid flow direction and valve core position within the valve cavity through the sight glass. This provides a clear and unobstructed field of view, greatly enhancing the user experience.

[0007] The present invention is further configured such that the cross-section of the guide groove is V-shaped, C-shaped, or C-shaped.

[0008] By adopting the above technical solutions and the multi-structure design of the guide groove, customers can have more choices.

[0009] The present invention is further configured such that the guide block and the fluoropolymer lining are an integral structure.

[0010] By adopting the above technical solution, not only is processing more convenient, but the overall strength is also higher and the service life is longer.

[0011] The present invention is further configured such that the guide block includes a connecting part and a guide plate, the guide groove is disposed on the guide plate, the guide plate is connected to the fluoropolymer lining layer through the connecting part, and the height of the guide plate is greater than the height of the connecting part.

[0012] By adopting the above technical solution, while saving fluoropolymer lining raw materials, the contact area between the guide plate and the valve core can be increased, resulting in better support and more stable valve core movement.

[0013] The present invention is further configured such that a conical sealing surface adapted to the shape of the valve core is provided at the position of the inner end of the inlet channel corresponding to the fluoropolymer lining layer. When the valve core is in the check position, the valve core and the conical sealing surface are tightly fitted together.

[0014] By adopting the above technical solution, reliable sealing between the valve core and the inner end of the inlet channel can be effectively guaranteed, thus achieving a good check valve effect.

[0015] The present invention is further configured such that the limiting protrusion is provided with a supporting arc surface adapted to the shape of the valve core, and when the valve core and the limiting protrusion form a limiting fit, the valve core abuts against the supporting arc surface.

[0016] By adopting the above technical solution, a support arc surface that can fit with the outer surface of the valve core is provided on the limiting protrusion. This not only provides better support but also protects the valve core and prevents the valve core from being scratched due to localized concentrated stress.

[0017] The present invention is further configured such that an end cap is connected to the upper and lower ends of the valve body by bolts, the transparent sight glass is sandwiched between the end cap and the valve body, and the outer end of the observation port is provided with a first positioning groove for one end of the transparent sight glass to be inserted, and the inner side of the end cap is provided with a second positioning groove for the other end of the transparent sight glass to be inserted.

[0018] By adopting the above technical solution, the transparent viewing mirror can be positioned and installed, and the installation structure is stable and reliable, and disassembly and assembly are very convenient.

[0019] The present invention is further provided that the upper and lower ends of the fluoropolymer lining are respectively provided with a flange for clamping between the transparent sight glass and the first positioning groove.

[0020] By adopting the above technical solution, not only can the seal between the transparent sight glass and the first positioning groove be achieved, but the firmness of the connection between the fluoropolymer lining and the valve body can also be further improved.

[0021] The present invention is further configured such that an annular buffer pad is sandwiched between the transparent viewing mirror and the end cap.

[0022] By adopting the above technical solution, stress concentration and breakage of the transparent sight glass caused by temperature changes can be prevented, thus protecting the transparent sight glass.

[0023] The present invention is further configured such that the valve core is spherical or cylindrical in shape.

[0024] By adopting the above technical solutions, customers have more choices with the two types of valve cores. Attached Figure Description

[0025] Figure 1 This is a perspective view of the entirety of Example 1;

[0026] Figure 2 This is the overall front view of Example 1;

[0027] Figure 3 for Figure 2 AA section view;

[0028] Figure 4 for Figure 2 BB section view;

[0029] Figure 5 This is a schematic diagram of the fluorine-lined layer in Example 1;

[0030] Figure 6 This is a cross-sectional view of the entirety of Example 2.

[0031] In the diagram: 1. Valve body; 2. Valve core; 3. Fluorine lining; 4. Inlet channel; 5. Middle cavity; 6. Outlet channel; 7. Observation port; 8. Transparent sight glass; 9. Guide block; 10. Guide groove; 11. Limiting protrusion; 12. Connecting part; 13. Guide plate; 14. Conical sealing surface; 15. Support arc surface; 16. Bolt; 17. End cap; 18. First positioning groove; 19. Second positioning groove; 20. Flanged part; 21. Annular buffer pad. Detailed Implementation

[0032] 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 protection scope of the present utility model.

[0033] Example 1: As shown in the attached document Figures 1-5The diagram shows a PTFE-lined check valve, comprising a valve body 1 and a spherical valve core 2. The valve body 1 has a PTFE lining 3 on its inner wall, the lining material of which can be polytetrafluoroethylene (PTFE). The valve body 1 has an inlet channel 4, a central cavity 5, and an outlet channel 6 connected sequentially within it. The valve core 2 is movably disposed within the central cavity 5. The valve body 1 has an observation port 7 at each of the upper and lower ends corresponding to the central cavity 5, and a transparent sight glass 8 is mounted on each observation port 7. The transparent sight glass 8 can be made of glass or acrylic. Guide blocks 9 are symmetrically arranged on the front and rear sides of the inner wall of the central cavity 5. A guide groove 10 is provided on one side near the valve core 2. The extension direction of the guide groove 10 is parallel to the extension direction of the inlet channel 4. The front and rear sides of the valve core 2 are respectively slidably engaged with the guide grooves 10 of the two guide blocks 9. When the valve core 2 moves, it has a check position that is pressed against the inner end of the inlet channel 4 and a conduction position that is disengaged from the inner end of the inlet channel 4. The guide block 9 is also provided with a limiting protrusion 11 at the end near the outlet channel 6 to limit the valve core 2 so that the valve core 2 cannot press against the inner end of the outlet channel 6. That is, when the valve core 2 is pushed by the fluid and abuts against the limiting protrusion 11, the fluid can still enter the outlet channel 6 from the middle cavity 5. The two guide blocks 9 hold the valve core 2 tightly, and the guide groove 10 on the guide block 9 restricts the vertical movement of the valve core 2, so that the valve core 2 moves along the direction of approaching or moving away from the inlet channel 4 under the action of water flow, realizing the valve's check or opening. It eliminates the obstruction at the top and bottom of the valve core 2, allowing a clear view of the flow direction of the fluid in the valve cavity 5 and the position of the valve core 2, which greatly enhances the user experience.

[0034] The guide groove 10 has a V-shaped, C-shaped, or C-shaped cross-section. The guide groove 10 offers multiple structural designs, providing customers with more options.

[0035] Regarding the design of guide block 9, it can be integrally processed with fluoropolymer lining layer 3, which not only makes processing more convenient, but also results in higher overall strength and longer service life.

[0036] As attached Figures 3-5 As shown, the guide block 9 includes a connecting part 12 and a guide plate 13. The guide groove 10 is disposed on the guide plate 13. The guide plate 13 is connected to the fluoropolymer lining layer 3 through the connecting part 12. The height of the guide plate 13 is greater than the height of the connecting part 12. While saving fluoropolymer lining raw materials, this increases the contact area between the guide plate 13 and the valve core 2, resulting in better support and more stable movement of the valve core 2.

[0037] As attached Figures 3-5As shown, the fluoropolymer lining 3 has a conical sealing surface 14 that matches the shape of the valve core 2 at the inner end of the inlet channel 4. When the valve core 2 is in the check valve position, the valve core 2 and the conical sealing surface 14 are tightly fitted together. This design can effectively ensure reliable sealing between the valve core 2 and the inner end of the inlet channel 4 when they are in contact, thus achieving a good check valve effect.

[0038] As attached Figures 3-5 As shown, the limiting protrusion 11 is provided with a supporting arc surface 15 that matches the shape of the valve core 2. When the valve core 2 and the limiting protrusion 11 form a limiting fit, the valve core 2 abuts against the supporting arc surface 15. The supporting arc surface 15 on the limiting protrusion 11, which can fit against the outer surface of the valve core 2, not only provides better support but also protects the valve core 2, preventing surface scratches caused by localized stress concentration.

[0039] As attached Figure 4 As shown, the upper and lower ends of the valve body 1 are respectively connected to an end cap 17 by bolts 16. The transparent sight glass 8 is sandwiched between the end cap 17 and the valve body 1. The outer end of the observation port 7 is provided with a first positioning groove 18 for one end of the transparent sight glass 8 to be inserted, and the inner side of the end cap 17 is provided with a second positioning groove 19 for the other end of the transparent sight glass 8 to be inserted. The first positioning groove 18 and the second positioning groove 19 are coaxially arranged. This design can realize the positioning and installation of the transparent sight glass 8, and the installation structure is stable and reliable, and disassembly and assembly are very convenient.

[0040] As attached Figure 4 As shown, the upper and lower ends of the fluoropolymer lining 3 are respectively provided with a flange 20 for clamping between the transparent sight glass 8 and the first positioning groove 18. This design not only achieves a seal between the transparent sight glass 8 and the first positioning groove 18, but also further enhances the firmness of the connection between the fluoropolymer lining 3 and the valve body 1.

[0041] As attached Figure 4 As shown, an annular buffer pad 21 is sandwiched between the transparent sight glass 8 and the end cap 17. The annular buffer pad 21 can be made of silicone. This design can prevent stress concentration and breakage of the transparent sight glass 8 due to temperature changes, thus protecting the transparent sight glass 8.

[0042] Example 2: Different from Example 1, as shown in the appendix. Figure 6 As shown, in this embodiment, the valve core 2 is cylindrical, and the end of the valve core 2 near the inlet channel 4 has a conical sealing part. This conical sealing part is used to form a sealing fit with the conical sealing surface 14 at the inner end of the inlet channel 4 corresponding to the fluoropolymer lining layer 3 when it abuts against it.

Claims

1. A fluoropolymer-lined check valve, comprising a valve body (1) and a valve core (2), wherein the inner wall of the valve body (1) is provided with a fluoropolymer lining layer (3), and the valve body (1) is provided with an inlet channel (4), a central cavity (5), and an outlet channel (6) connected in sequence therein, the valve core (2) is movably disposed in the central cavity (5), and the valve body (1) is provided with an observation port (7) at the upper and lower ends corresponding to the central cavity (5), and a transparent sight glass (8) is installed on the observation port (7); characterized in that: Guide blocks (9) are symmetrically arranged on the front and rear sides of the inner wall of the middle cavity (5). The guide block (9) has a guide groove (10) on the side near the valve core (2). The extension direction of the guide groove (10) is parallel to the extension direction of the inlet channel (4). The front and rear sides of the valve core (2) are respectively slidably engaged with the guide grooves (10) of the two guide blocks (9). When the valve core (2) moves, it has a check position that abuts against the inner end of the inlet channel (4) and a conduction position that disengages from the inner end of the inlet channel (4). The end of the guide block (9) near the outlet channel (6) is also provided with a limiting protrusion (11) for limiting the valve core (2) so that the valve core (2) cannot abut against the inner end of the outlet channel (6).

2. The sight glass fluoropolymer-lined check valve according to claim 1, characterized in that: The cross-section of the guide groove (10) is V-shaped, C-shaped, or C-shaped.

3. A fluorine-lined check valve for sight glasses according to claim 2, characterized in that: The guide block (9) and the fluorine lining layer (3) are an integral structure.

4. A fluorine-lined check valve for sight glasses according to claim 3, characterized in that: The guide block (9) includes a connecting part (12) and a guide plate (13). The guide groove (10) is disposed on the guide plate (13). The guide plate (13) is connected to the fluoropolymer lining layer (3) through the connecting part (12). The height of the guide plate (13) is greater than the height of the connecting part (12).

5. A fluorine-lined check valve for sight glasses according to claim 1, characterized in that: The fluoropolymer lining (3) is provided with a conical sealing surface (14) that matches the shape of the valve core (2) at the inner end of the inlet channel (4). When the valve core (2) is in the check position, the valve core (2) and the conical sealing surface (14) are tightly fitted together.

6. A fluorine-lined check valve for sight glasses according to claim 1, characterized in that: The limiting protrusion (11) is provided with a supporting arc surface (15) that is adapted to the shape of the valve core (2). When the valve core (2) and the limiting protrusion (11) form a limiting fit, the valve core (2) abuts against the supporting arc surface (15).

7. A fluorine-lined check valve for sight glasses according to claim 1, characterized in that: The valve body (1) has an end cap (17) connected to its upper and lower ends by bolts (16). The transparent sight glass (8) is sandwiched between the end cap (17) and the valve body (1). The outer end of the observation port (7) is provided with a first positioning groove (18) for one end of the transparent sight glass (8) to be inserted. The inner side of the end cap (17) is provided with a second positioning groove (19) for the other end of the transparent sight glass (8) to be inserted.

8. A fluorine-lined check valve for sight glasses according to claim 7, characterized in that: The fluoropolymer lining (3) is provided with a flange (20) at both the upper and lower ends for clamping between the transparent sight glass (8) and the first positioning groove (18).

9. A fluorine-lined check valve for sight glasses according to claim 7, characterized in that: An annular buffer pad (21) is sandwiched between the transparent viewing mirror (8) and the end cap (17).

10. A fluorine-lined check valve for sight glasses according to claim 1, characterized in that: The valve core (2) is spherical or cylindrical in shape.

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