A butterfly valve with bidirectional sealing

Abstract

The utility model relates to valve technical field especially is involved in a kind of butterfly valve of two-way sealing, including valve body, valve seat, butterfly plate, valve rod and drive mechanism, the valve seat includes end cap and elastic sealing ring, the end cap is connected with the side of valve body corresponding export flow passage by first fastener, the section of the elastic sealing ring is C-shaped shape, and two ends of the elastic sealing ring are fixed ring and movable ring respectively, the fixed ring is clamped between end cap and valve body, the movable ring one side is sealed with butterfly plate, and the other side forms pressure chamber with end cap, the end cap is also provided with pressure hole, the export flow passage is communicated with pressure chamber by pressure hole, the utility model does not push away valve seat when fluid pressure also will not valve clack when fluid flow direction changes, with the ability of two-way sealing, it is applicable to the pipeline of fluid flow direction change.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a bidirectional sealing butterfly valve. Background Technology

[0002] A butterfly valve is a type of valve that uses a disc-shaped opening and closing element to rotate approximately 90° to open, close, or regulate the flow of media. As a widely used shut-off device in industrial pipeline systems, the butterfly valve is not only simple in structure, small in size, light in weight, economical in material consumption, small in installation dimensions, low in driving torque, and easy and quick to operate, but also has good flow regulation function and sealing characteristics.

[0003] However, existing butterfly valves can only seal under positive pressure, that is, the fluid pressure pushes the valve disc against the valve seat. In pipelines where the fluid flow direction changes constantly, the reverse fluid pressure will push the valve disc away from the valve seat, which cannot achieve a good seal and will lead to leakage. Therefore, they are not suitable for pipelines where the fluid flow direction changes. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a two-way sealing butterfly valve. This invention will not push the valve disc away from the valve seat when the fluid flow direction changes, and has the ability to seal in both directions. It is suitable for pipelines where the fluid flow direction changes.

[0005] The technical solution adopted by this utility model is as follows: A bidirectional sealing butterfly valve includes a valve body, a valve seat, a butterfly plate, a valve stem, and a drive mechanism. The valve body has a flow channel inside. The valve seat and the butterfly plate seal together to divide the flow channel into an inlet flow channel and an outlet flow channel. One end of the valve stem is connected to the drive mechanism, and the other end passes through the valve body and is connected to the butterfly plate. The valve seat includes an end cap and an elastic sealing ring. The end cap is connected to one side of the valve body corresponding to the outlet flow channel by a first fastener. The elastic sealing ring has a C-shaped cross-section, and the two ends of the elastic sealing ring are a fixed ring and a movable ring, respectively. The fixed ring is sandwiched between the end cap and the valve body. One side of the movable ring seals with the butterfly plate, and the other side forms a pressure chamber with the end cap. The end cap also has a pressure hole, and the outlet flow channel communicates with the pressure chamber through the pressure hole.

[0006] The elastic sealing ring also has an annular groove in the middle of the side away from the pressure chamber that communicates with the inlet flow channel.

[0007] The movable ring is inclined toward the butterfly plate, and the end of the movable ring abuts against the end cap.

[0008] The thickness of the fixed ring is greater than the thickness of the movable ring.

[0009] The butterfly plate includes a butterfly plate body, an elastic sealing ring, and a pressure cap. The pressure cap is connected to one side of the butterfly plate body corresponding to the inlet flow channel via a second fastener. The elastic sealing ring includes a fixed ring and a movable ring. The fixed ring is sandwiched between the butterfly plate body and the pressure cap. The movable ring is inclined toward the valve seat, and the movable ring and the movable ring seal together to divide the flow channel into an inlet flow channel and an outlet flow channel.

[0010] A recess is provided on one side of the fixing ring, and a through hole is provided on the pressure cap. The inlet flow channel is connected to the recess through the through hole.

[0011] A limiting part is also provided between the fixed ring and the movable ring. The limiting part and the fixed ring are disposed opposite to each other on both sides of the recess. The fixed ring is fixedly disposed between the pressure cover and the butterfly plate body. A movable cavity is also formed between the pressure cover and the butterfly plate body. The limiting part is reciprocally disposed inside the movable cavity. The thickness of the fixed ring is greater than the thickness of the limiting part.

[0012] Both the elastic sealing ring and the elastic sealing ring are made of expanded PTFE tape.

[0013] The beneficial effects of this utility model are as follows: This utility model helps the movable ring on the valve seat to fit tightly against the butterfly plate by setting a pressure chamber on the valve seat. When fluid flows through the inlet channel, the fluid pushes the butterfly plate towards the valve seat to achieve a seal. When the fluid flow direction in the pipeline changes, it becomes the outlet channel. The fluid in the outlet channel flows into the pressure chamber through the pressure hole. The movable ring deforms and moves towards the butterfly plate due to the pressure of the fluid in the pressure chamber. The movable ring remains tightly against the butterfly plate, so that the seal can be maintained even when the fluid flow direction changes. When the fluid flow direction changes, the fluid pressure will not push the valve disc away from the valve seat. It has a bidirectional sealing capability and is suitable for pipelines where the fluid flow direction changes. Attached Figure Description

[0014] 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.

[0015] Figure 1 This is a schematic diagram of the structure of a bidirectional sealing butterfly valve according to the present invention;

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0017] In the figure, 1-valve body, 2-valve seat, 3-butterfly plate, 4-valve stem, 5-drive mechanism, 6-inlet flow channel, 7-outlet flow channel, 8-end cover, 9-first fastener, 10-fixed ring, 11-moving ring, 12-pressure chamber, 13-pressure hole, 14-elastic sealing ring, 15-ring groove, 16-butterfly plate body, 17-elastic sealing ring, 18-pressure cap, 19-second fastener, 20-fixed ring, 21-moving ring, 22-recess, 23-through hole, 24-limiting part, 25-moving chamber. Detailed Implementation

[0018] 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.

[0019] 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.

[0020] 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.

[0021] like Figures 1 to 2 As shown, this is an embodiment of the present invention: a bidirectional sealing butterfly valve, comprising a valve body 1, a valve seat 2, a butterfly plate 3, a valve stem 4, and a drive mechanism 5. The valve body 1 has an internal flow channel. The valve seat 2 and the butterfly plate 3 are sealed together to divide the flow channel into an inlet flow channel 6 and an outlet flow channel 7. One end of the valve stem 4 is connected to the drive mechanism 5, and the other end passes through the valve body 1 and is connected to the butterfly plate 3. The valve seat 2 includes an end cap 8 and an elastic sealing ring 14. The end cap 8 is connected to one side of the valve body 1 corresponding to the outlet flow channel 7 by a first fastener 9. The elastic sealing ring 14 has a C-shaped cross-section, and its two ends are a fixed ring 10 and a movable ring 11, respectively. The fixed ring 10 is sandwiched between the end cap 8 and the valve body 1. One side of the movable ring 11 is sealed together with the butterfly plate 3, and the other side forms a pressure chamber 12 with the end cap 8. The end cap 8 also has a pressure hole 13, and the outlet flow channel 7 communicates with the pressure chamber 12 through the pressure hole 13.

[0022] The beneficial effects of this design are as follows: This invention, by setting a pressure chamber on the valve seat, helps the movable ring on the valve seat to fit tightly against the butterfly plate. When fluid flows through the inlet channel, the fluid pushes the butterfly plate against the valve seat to achieve a seal. When the fluid flow direction changes in the pipeline, it becomes the outlet channel, where fluid flows through the pressure hole into the pressure chamber. The movable ring deforms and moves towards the butterfly plate due to the pressure of the fluid in the pressure chamber, maintaining a tight fit with the butterfly plate. This ensures a seal even when the fluid flow direction changes, and the fluid pressure will not push the valve disc away from the valve seat when the fluid flow direction changes. It has bidirectional sealing capability and is suitable for pipelines where the fluid flow direction changes. The first fastener uses existing bolts.

[0023] Furthermore, the elastic sealing ring 14 is provided with an annular groove 15 communicating with the inlet flow channel 6 on the middle part of the side away from the pressure chamber 12.

[0024] The beneficial effects of this design are as follows: the annular groove allows fluid to flow into the inlet channel, helping the movable ring to deform and move toward the disc, thus improving sealing even when the fluid flow direction remains unchanged.

[0025] Furthermore, the movable ring 11 is inclined toward the butterfly plate 3, and the end of the movable ring 11 abuts against the end cover 8.

[0026] The beneficial effects of this design are as follows: when the disc is affected by the fluid pressure in the inlet channel, it will be pushed towards the inclined movable ring. The greater the fluid pressure, the tighter the disc and the movable ring fit together. It also increases the internal space of the pressure chamber, making it easier for the movable ring to deform and move towards the disc.

[0027] Furthermore, the thickness of the fixed ring 10 is greater than the thickness of the movable ring 11.

[0028] The beneficial effects of this design are as follows: the fixed ring can be securely installed between the end cap and the valve body, and the thinner moving ring is more easily deformed, improving the responsiveness to fluid pressure.

[0029] Further configuration: The butterfly plate 3 includes a butterfly plate body 16, an elastic sealing ring 17, and a pressure cap 18. The pressure cap 18 is connected to one side of the butterfly plate body 16 corresponding to the inlet flow channel 6 via a second fastener 19. The elastic sealing ring 17 includes a fixed ring 20 and a movable ring 21. The fixed ring 20 is sandwiched between the butterfly plate body 16 and the pressure cap 18. The movable ring 21 is inclined toward the valve seat 2, and the movable ring 21 and the movable ring 11 seal together to divide the flow channel into an inlet flow channel 6 and an outlet flow channel 7.

[0030] The advantages of this design are as follows: the butterfly plate also adopts a split structure, that is, the elastic sealing ring and the pressure cap are installed on the butterfly plate body. The movable ring of the elastic sealing ring is adapted to the inclined plane of the movable ring of the elastic sealing ring and provides a sealing fit, which facilitates maintenance and replacement of parts. The second fastener also uses bolts of existing technology.

[0031] Further, a recess 22 is provided on one side of the fixing ring 20, and a through hole 23 is provided on the pressure cap 18. The inlet flow channel 6 is connected to the recess 22 through the through hole 23.

[0032] The beneficial effects of this design are as follows: the fluid in the inlet channel flows into the recess through the through hole, and the pressure of the fluid causes the movable ring to deform and move towards the movable ring, further improving the sealing performance when the fluid flows in the pipeline in the forward direction.

[0033] Furthermore, a limiting part 24 is provided between the fixed ring 20 and the movable ring 21. The limiting part 24 and the fixed ring 20 are disposed opposite each other on both sides of the recess 22. The fixed ring 20 is fixedly disposed between the pressure cover 18 and the butterfly plate body 16. A movable cavity 25 is also formed between the pressure cover 18 and the butterfly plate body 16. The limiting part 24 is reciprocally disposed inside the movable cavity 25. The thickness of the fixed ring 20 is greater than the thickness of the limiting part 24.

[0034] The beneficial effects of this design are as follows: the limiting part causes the movable ring to deform and move; the movable cavity restricts the range of motion of the limiting part, preventing the limiting part from detaching from the butterfly plate and ensuring a firm installation; and the thinner limiting part can also improve the responsiveness to fluid pressure.

[0035] Furthermore, both the elastic sealing ring 14 and the elastic sealing ring 17 are made of expanded PTFE tape.

[0036] The beneficial effects of this design are as follows: the elastic sealing ring and the elastic sealing ring deform and move by utilizing the fluid in the outlet flow channel and the fluid in the inlet flow channel, respectively. With the cooperation of the elastic sealing ring and the elastic sealing ring, bidirectional sealing is achieved. No matter which direction the fluid in the flow channel flows, the butterfly valve can maintain a good seal. Expanded PTFE tape is a sealing material made of polytetrafluoroethylene (PTFE) as the main raw material. After physical modification such as expansion, it can obtain practical elastic properties and is easier to deform to achieve sealing.

[0037] 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 bidirectional sealing butterfly valve, comprising a valve body (1), a valve seat (2), a butterfly plate (3), a valve stem (4), and a drive mechanism (5), wherein the valve body (1) has a flow channel inside, the valve seat (2) and the butterfly plate (3) are sealed together to divide the flow channel into an inlet flow channel (6) and an outlet flow channel (7), one end of the valve stem (4) is connected to the drive mechanism (5) and the other end passes through the valve body (1) and connects to the butterfly plate (3), characterized in that: The valve seat (2) includes an end cap (8) and an elastic sealing ring (14). The end cap (8) is connected to one side of the valve body (1) corresponding to the outlet flow channel (7) by a first fastener (9). The elastic sealing ring (14) has a C-shaped cross section, and the two ends of the elastic sealing ring (14) are a fixed ring (10) and a movable ring (11) respectively. The fixed ring (10) is sandwiched between the end cap (8) and the valve body (1). One side of the movable ring (11) is sealed with the butterfly plate (3), and the other side forms a pressure chamber (12) with the end cap (8). The end cap (8) is also provided with a pressure hole (13). The outlet flow channel (7) is connected to the pressure chamber (12) through the pressure hole (13).

2. The bidirectional sealing butterfly valve according to claim 1, characterized in that: The elastic sealing ring (14) is provided with an annular groove (15) in the middle of the side away from the pressure chamber (12) that communicates with the inlet flow channel (6).

3. The bidirectional sealing butterfly valve according to claim 1, characterized in that: The movable ring (11) is inclined toward the butterfly plate (3), and the end of the movable ring (11) abuts against the end cap (8).

4. The bidirectional sealing butterfly valve according to claim 1, characterized in that: The thickness of the fixed ring (10) is greater than the thickness of the movable ring (11).

5. A bidirectional sealing butterfly valve according to claim 1, characterized in that: The butterfly plate (3) includes a butterfly plate body (16), an elastic sealing ring (17), and a pressure cap (18). The pressure cap (18) is connected to the side of the butterfly plate body (16) corresponding to the inlet flow channel (6) by a second fastener (19). The elastic sealing ring (17) includes a fixed ring (20) and a movable ring (21). The fixed ring (20) is sandwiched between the butterfly plate body (16) and the pressure cap (18). The movable ring (21) is inclined towards the valve seat (2), and the movable ring (21) and the movable ring (11) are sealed together to divide the flow channel into an inlet flow channel (6) and an outlet flow channel (7).

6. A bidirectional sealing butterfly valve according to claim 5, characterized in that: A recess (22) is provided on one side of the fixing ring (20), and a through hole (23) is provided on the pressure cap (18). The inlet flow channel (6) is connected to the recess (22) through the through hole (23).

7. A bidirectional sealing butterfly valve according to claim 6, characterized in that: A limiting part (24) is also provided between the fixed ring (20) and the movable ring (21). The limiting part (24) and the fixed ring (20) are disposed opposite to each other on both sides of the recess (22). The fixed ring (20) is fixedly disposed between the pressure cover (18) and the butterfly plate body (16). A movable cavity (25) is also formed between the pressure cover (18) and the butterfly plate body (16). The limiting part (24) is reciprocally disposed inside the movable cavity (25). The thickness of the fixed ring (20) is greater than the thickness of the limiting part (24).

8. A bidirectional sealing butterfly valve according to claim 5, characterized in that: Both the elastic sealing ring (14) and the elastic sealing ring (17) are made of expanded PTFE tape.

Images