Fluorine-lined double-seat regulating valve

Abstract

This utility model provides a fluoropolymer-lined double-seat regulating valve, belonging to the field of valves. It includes a valve body and a valve stem. A first valve seat is disposed within the valve body. It also includes a valve core assembly connected to the valve stem and comprising a first valve core and a second valve core. A first sealing portion is formed between the first valve core and the first valve seat. A first receiving cavity is formed between the first valve core and the valve stem. The second valve core is connected to the valve stem and slidably disposed within the first receiving cavity. The first and second valve cores form a second sealing portion. A first flow hole and a second flow hole are disposed at the upper and lower ends of the first valve core, and a third flow hole is disposed on the second valve core. The three flow holes are interconnected. An inlet chamber and an outlet chamber are disposed within the valve body. The inlet chamber, the first flow hole, the third flow hole, the second flow hole, and the outlet chamber form a small flow channel. This utility model not only has the ability to regulate the flow rate of the medium but also allows for precise regulation of the flow rate even with a small opening degree. Furthermore, this valve is corrosion-resistant, improving its service life.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, specifically to a fluoropolymer-lined double-seat regulating valve. Background Technology

[0002] A control valve typically consists of a valve body, valve core, valve seat, valve stem, and actuator. It is mainly used to regulate parameters such as flow rate, pressure, and temperature of fluids by changing the valve opening to control the flow rate of the fluid.

[0003] In the application of control valves, to enable them to be used with various media, especially corrosive media, a fluoropolymer lining is applied to the inside of the control valve. This prevents the valve from directly contacting the media, while the highly corrosion-resistant fluoropolymer lining effectively protects the valve's main structure from corrosion. However, existing fluoropolymer-lined control valves lack precision at small openings, failing to meet the needs of refined industrial production. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a fluoropolymer-lined double-seat regulating valve.

[0005] The technical solution adopted by this utility model is as follows: A fluoropolymer-lined double-seat regulating valve includes a valve body and a valve stem. A first valve seat is disposed in the valve body, and a valve core assembly is also disposed in the valve body. The valve core assembly is connected to the valve stem and includes a first valve core and a second valve core. A first sealing part is formed between the first valve core and the first valve seat. A first receiving cavity is formed between the first valve core and the valve stem. The second valve core is connected to the valve stem and is slidably disposed in the first receiving cavity. The first valve core and the second valve core form a second sealing part. A first flow hole and a second flow hole are disposed at the upper and lower ends of the first valve core. A third flow hole is disposed on the second valve core. The first flow hole, the second flow hole, and the third flow hole are interconnected. The interior of the valve body is divided into an inlet cavity and an outlet cavity by the first valve seat and the valve core assembly. The inlet cavity, the first flow hole, the third flow hole, the second flow hole, and the outlet cavity form a small flow channel. The inlet cavity, the first valve seat, and the outlet cavity form a large flow channel.

[0006] A second valve seat is disposed above the first valve seat. The valve core assembly also includes a third valve core disposed above the first valve core and the second valve core. The third valve core is connected to the valve stem and forms a third sealing part with the second valve seat.

[0007] The valve core assembly, valve body, and second valve seat form a second receiving cavity, which is connected to the first flow hole and the inlet cavity.

[0008] A throttling ring is provided inside the inlet cavity near the valve core assembly, and the throttling ring is provided with a number of throttling holes at intervals.

[0009] The valve body is provided with a guide ring, which is located above the third valve core and is slidably connected to the valve stem.

[0010] The valve body includes an upper valve body and a lower valve body. The upper valve body is provided with a first fluoropolymer lining layer, and the lower valve body is provided with a second fluoropolymer lining layer.

[0011] The first fluoropolymer lining layer has a first extension, and the second fluoropolymer lining layer has a second extension. The first extension and the second extension are located in the gap between the upper valve body and the lower valve body. The upper valve body has a first locking ring corresponding to the first extension, and the lower valve body has a first step corresponding to the second extension. The first step has a second locking ring. The first locking ring and the second locking ring cooperate to press the first extension and the second extension together.

[0012] The lower valve body is provided with a second step corresponding to the first step, and an elastic element is provided in the second step.

[0013] The second valve seat is provided with a sealing protrusion, and the first valve core is provided with a sealing groove that matches the sealing protrusion. The sealing protrusion and the sealing groove form the first sealing part. The first valve core is provided with a first sealing cone surface, and the second valve core is provided with a second sealing cone surface that matches the first sealing cone surface. The first sealing cone surface and the second sealing cone surface form the second sealing part.

[0014] The upper valve body is connected to a valve cover, the first valve seat is disposed on the lower valve body, and the second valve seat is disposed on the upper valve body.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. This utility model is equipped with a small flow channel and a large flow channel, which not only has the ability to adjust the flow rate of the medium, but also allows for precise adjustment of the flow rate of the medium under small opening and closing conditions;

[0017] 2. This utility model features a fluoropolymer lining to prevent valve corrosion and extend its service life;

[0018] 3. This utility model is equipped with a locking ring to ensure a tight fit of the PTFE lining at the connection between the upper and lower valve bodies;

[0019] 4. This utility model is equipped with a guide ring to prevent the valve stem from shifting during movement. Attached Figure Description

[0020] 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, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0021] Figure 1 This is a schematic diagram of the present invention;

[0022] Figure 2 This is a partial schematic diagram of the present utility model;

[0023] Figure 3 for Figure 1 Enlarged view of A in the middle;

[0024] Figure 4 for Figure 1 Enlarged view of B in the middle;

[0025] Figure 5 for Figure 1 Enlarged view of C;

[0026] Figure 6 This is a schematic diagram of the first valve core of this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0028] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0029] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0030] Example 1:

[0031] like Figures 1 to 6 The image shows an embodiment of a fluoropolymer-lined double-seat regulating valve provided by this utility model:

[0032] A fluoropolymer-lined double-seat regulating valve includes a valve body, a valve cover 2, and a valve stem 5. The valve body includes an upper valve body 11 and a lower valve body 12. A second valve seat 32 is provided inside the upper valve body 11, and a first valve seat 31 is provided inside the lower valve body 12. The valve cover 2 is connected to the upper valve body 11 by bolts and nuts.

[0033] The upper valve body 11 is provided with a first fluoropolymer lining layer 61, and the lower valve body 12 is provided with a second fluoropolymer lining layer 62. The valve body cavity is covered with a corrosion-resistant fluoropolymer lining layer, which can prevent the valve body from being directly corroded by contact with the fluid medium and improve the service life of the valve.

[0034] To ensure a tight fluoropolymer lining around the valve body, especially at the connection between the upper valve body 11 and the lower valve body 12, in this invention, the first fluoropolymer lining layer 61 is provided with a first extension 611, and the second fluoropolymer lining layer 62 is provided with a second extension 621. The first extension 611 and the second extension 621 are located in the gap between the upper valve body 11 and the lower valve body 12. The upper valve body 11 is provided with a first locking ring 111 corresponding to the first extension 611, and the lower valve body 12 is provided with a first step 124 corresponding to the second extension 621. A second locking ring 1241 is provided within the first step 124. The first locking ring 111 and the second locking ring 1241 cooperate to press the first extension 611 and the second extension 621 together.

[0035] To further improve the PTFE lining strength at the connection between valve body 11 and lower valve body 12, a second step 125 is provided on the lower valve body 12 corresponding to the first step 124. An elastic element 8 is provided in the second step 125. The elastic element 8 is subjected to a pre-tightening force. The elastic force of the elastic element 8 presses the second locking ring 1241 toward the second extension 621, making the first extension 611 and the second extension 621 abut more tightly.

[0036] The aforementioned fluoropolymer-lined double-seat regulating valve further includes a valve core assembly 4 disposed within the valve body. The valve core assembly 4 is connected to a valve stem 5 and includes a first valve core 41 and a second valve core 42. A first sealing portion is formed between the first valve core 41 and a first valve seat 31. A first receiving cavity 413 is formed between the first valve core 41 and the valve stem 5. The second valve core 42 is connected to the valve stem 5 and slidably disposed within the first receiving cavity 413. The first valve core 41 and the second valve core 42 form a second sealing portion. The first valve core 41... The valve body is provided with a first flow hole 411 and a second flow hole 412 at one end, and a third flow hole 421 at the other end. The first flow hole 411 and the third flow hole 421 communicate with each other. The valve body is divided into an inlet chamber 121 and an outlet chamber 122 by a first valve seat 31 and a valve core assembly 4. The inlet chamber 121, the first flow hole 411, the third flow hole 421, the second flow hole 412, and the outlet chamber 122 form a small flow channel for small flow pressure relief, allowing for precise adjustment even with a small opening degree. The valve core assembly 4, the valve body, and the second valve seat 32 form a second receiving cavity 7, which communicates with both the first flow hole 411 and the inlet chamber 121, and is used to receive the medium. The inlet chamber 121, the first valve seat 31, and the outlet chamber 122 form a large flow channel for large flow pressure relief.

[0037] The second valve seat 32 is disposed above the first valve seat 31. The valve core assembly 4 also includes a third valve core 43 disposed above the first valve core 41 and the second valve core 42. The third valve core 43 is connected to the valve stem 5 and forms a third sealing part with the second valve seat 32 to prevent the medium from flowing into the inner cavity of the upper valve body 11 and the valve cover 2 when the valve is closed.

[0038] In order to disperse the impact force generated when the fluid medium enters the valve body, reduce the destructive effect of the fluid medium on the valve core assembly 4 and the valve seat, and protect the sealing surface, a throttling ring 123 is provided in the inlet cavity 121 near the valve core assembly 4, and a plurality of throttling holes 1231 are provided on the throttling ring 123 at intervals.

[0039] To prevent the valve stem 5 from shifting during use, the valve body is provided with a guide ring 9, which is located above the third valve core 43 and is slidably connected to the valve stem 5.

[0040] To improve the sealing effect, the second valve seat 32 is provided with a sealing protrusion, and the first valve core 41 is provided with a sealing groove 414 that matches the sealing protrusion. The sealing protrusion and the sealing groove 414 form the first sealing part. The first valve core 41 is provided with a first sealing cone surface, and the second valve core 42 is provided with a second sealing cone surface that matches the first sealing cone surface. The first sealing cone surface and the second sealing cone surface form the second sealing part.

[0041] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A fluoropolymer-lined double-seat regulating valve, comprising a valve body and a valve stem (5), wherein a first valve seat (31) is disposed within the valve body, characterized in that, It also includes a valve core assembly (4) disposed within the valve body. The valve core assembly (4) is connected to the valve stem (5) and includes a first valve core (41) and a second valve core (42). A first sealing portion is formed between the first valve core (41) and the first valve seat (31). A first receiving cavity (413) is formed between the first valve core (41) and the valve stem (5). The second valve core (42) is connected to the valve stem (5) and slidably disposed within the first receiving cavity (413). The first valve core (41) and the second valve core (42) form a second sealing portion. A first flow hole (411) is provided at the upper and lower ends of the first valve core (41). The second flow hole (412) and the second valve core (42) are provided with a third flow hole (421). The first flow hole (411), the second flow hole (412) and the third flow hole (421) are connected. The valve body is divided into an inlet cavity (121) and an outlet cavity (122) by the first valve seat (31) and the valve core assembly (4). The inlet cavity (121), the first flow hole (411), the third flow hole (421), the second flow hole (412) and the outlet cavity (122) form a small flow channel. The inlet cavity (121), the first valve seat (31) and the outlet cavity (122) form a large flow channel.

2. The fluoropolymer-lined double-seat regulating valve according to claim 1, characterized in that, A second valve seat (32) is provided above the first valve seat (31). The valve core assembly (4) also includes a third valve core (43) provided above the first valve core (41) and the second valve core (42). The third valve core (43) is connected to the valve stem (5) and forms a third sealing part with the second valve seat (32).

3. The fluoropolymer-lined double-seat regulating valve according to claim 1, characterized in that, The valve core assembly (4), valve body and second valve seat (32) form a second receiving cavity (7), which is connected to the first flow hole (411) and the inlet cavity (121).

4. The fluoropolymer-lined double-seat regulating valve according to claim 1, characterized in that, A throttling ring (123) is provided in the inlet cavity (121) near the valve core assembly (4), and a plurality of throttling holes (1231) are provided on the throttling ring (123) at intervals.

5. A fluoropolymer-lined double-seat regulating valve according to claim 1, characterized in that, The valve body is provided with a guide ring (9), which is located above the third valve core (43) and is slidably connected to the valve stem (5).

6. A fluoropolymer-lined double-seat regulating valve according to claim 2, characterized in that, The valve body includes an upper valve body (11) and a lower valve body (12). The upper valve body (11) is provided with a first fluoropolymer lining layer (61), and the lower valve body (12) is provided with a second fluoropolymer lining layer (62).

7. A fluoropolymer-lined double-seat regulating valve according to claim 6, characterized in that, The first fluoropolymer lining layer (61) is provided with a first extension (611), and the second fluoropolymer lining layer (62) is provided with a second extension (621). The first extension (611) and the second extension (621) are provided in the gap at the connection between the upper valve body (11) and the lower valve body (12). The upper valve body (11) is provided with a first locking ring (111) corresponding to the first extension (611), and the lower valve body (12) is provided with a first step (124) corresponding to the second extension (621). The first step (124) is provided with a second locking ring (1241). The first locking ring (111) and the second locking ring (1241) cooperate to press the first extension (611) and the second extension (621).

8. A fluoropolymer-lined double-seat regulating valve according to claim 7, characterized in that, The lower valve body (12) is provided with a second step (125) corresponding to the first step (124), and an elastic element (8) is provided in the second step (125).

9. A fluoropolymer-lined double-seat regulating valve according to claim 2, characterized in that, The second valve seat (32) is provided with a sealing protrusion, and the first valve core (41) is provided with a sealing groove (414) that matches the sealing protrusion. The sealing protrusion and the sealing groove (414) form the first sealing part. The first valve core (41) is provided with a first sealing cone surface, and the second valve core (42) is provided with a second sealing cone surface that matches the first sealing cone surface. The first sealing cone surface and the second sealing cone surface form the second sealing part.

10. A fluoropolymer-lined double-seat regulating valve according to claim 6, characterized in that, The upper valve body (11) is connected to a valve cover (2), the first valve seat (31) is disposed on the lower valve body (12), and the second valve seat (32) is disposed on the upper valve body (11).

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