Low-torque butterfly valve

Abstract

The utility model discloses a low torque butterfly valve relates to valve technical field, including valve body, valve stem, butterfly plate, valve seat, actuating mechanism, the butterfly plate is provided in the valve body and constitutes seal fit with the valve seat, the lower end of valve stem is connected butterfly plate, the upper end extends out of the valve body and is connected with actuating mechanism, the valve body is provided with mounting groove corresponding to the valve seat, and the actuating mechanism is connected with the mounting groove. A clamping hoop is arranged in the mounting groove and arranged on the outer side of the valve seat, and the end, used for fastening, of the clamping hoop extends out of the valve body. When the valve is opened and closed, the butterfly plate is not in contact with the valve seat, friction-free opening and closing can be achieved, opening and closing torque is small, and the service life of the valve can be effectively prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a low-torque butterfly valve. Background Art

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media, primarily serving as a cutoff and throttling mechanism. Its opening and closing element is a disc-shaped disc that rotates around its axis within the valve body, achieving the desired opening, closing, or regulation. Existing large-diameter butterfly valves experience high media pressures due to the fluid pressure acting perpendicularly on the disc, resulting in a significant opening torque. This requires a thicker valve stem and a high-power actuator for opening and closing, which can easily damage the valve seat or disc during the opening and closing process. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the utility model provides a low-torque butterfly valve.

[0004] The technical solutions provided by this utility model are:

[0005] A low-torque butterfly valve includes a valve body, a valve stem, a butterfly plate, a valve seat, and an actuator. The butterfly plate is arranged in the valve body and forms a sealing fit with the valve seat. The lower end of the valve stem is connected to the butterfly plate, and the upper end extends out of the valve body and is connected to the actuator. The valve body is provided with a mounting groove corresponding to the valve seat, and a clamp is provided in the mounting groove. The clamp is arranged on the outside of the valve seat, and the end of the clamp used for tightening extends out of the valve body.

[0006] The clamp comprises an upper clamp and a lower clamp. The upper clamp and the lower clamp have the same structure and are semicircular. When closed, they are matched with the outer ring of the valve seat.

[0007] A fastening portion is provided on the side of the upper clamp and the lower clamp, and the fastening portion extends out of the valve body. A screw hole is provided on the fastening portion, and an adjusting bolt is installed in the screw hole.

[0008] The end of the butterfly plate is provided with a sealing flap which forms a sealing match with the valve seat, and the sealing flap is detachably connected to the butterfly plate.

[0009] The end of the butterfly plate is provided with an annular groove for installing a sealing petal, and a pressing plate and screws are provided outside the annular groove. The pressing plate fixes the sealing petal and the butterfly plate and is fastened by screws.

[0010] A valve neck is provided at the upper end of the valve body, a packing is provided between the valve neck and the valve stem, a packing gland is provided on the packing, and the packing gland is connected to the valve body through screws to compress the packing.

[0011] The valve neck is provided with a grease injection valve.

[0012] A lower valve cover is provided at the lower end of the valve body, and a heat preservation and cleaning hole is provided on the lower valve cover.

[0013] The lower valve cover is provided with a grease injection valve.

[0014] The beneficial effects of the utility model are as follows: the utility model provides an installation groove at the valve body corresponding to the valve seat, a clamp is provided in the installation groove, the clamp is provided on the outside of the valve seat, and the end of the clamp used for fastening extends out of the valve body. When the valve is closed, the clamp is tightened to make the valve seat and the butterfly plate fit together to form a sealing fit. When the valve is opened, the clamp is loosened to separate the valve seat and the butterfly plate. At this time, frictionless opening can be achieved by rotating the valve stem. The valve opening and closing torque is small, which can effectively extend the service life of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic structural diagram of an embodiment of the present utility model;

[0016] Figure 2 This is a structural diagram of another angle of an embodiment of the utility model. DETAILED DESCRIPTION

[0017] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, a low-torque butterfly valve includes a valve body 1, a valve stem 5, a butterfly plate 12, a valve seat 6, and an actuator 17. The butterfly plate 12 is disposed within the valve body 1 and forms a sealing fit with the valve seat 6. The lower end of the valve stem 5 is connected to the butterfly plate 12, and the upper end extends outside the valve body 1 and is connected to the actuator 17. The actuator 17 drives the valve stem 5 to rotate, thereby driving the butterfly plate 12 to rotate and control the opening and closing of the valve. The valve body 1 has a mounting groove 8 corresponding to the valve seat 6. The mounting groove 8 is provided with a clamp 7. The clamp 7 includes an upper clamp 21 and a lower clamp 22. The upper clamp 21 and the lower clamp 22 have the same structure and are semicircular. When closed, they adapt to the outer ring of the valve seat 6. Fastening portions 23 are provided on the sides of the upper clamp 21 and the lower clamp 22. The fastening portions 23 extend outside the valve body 1 and are provided with screw holes. Adjustment bolts 24 are installed in the screw holes.

[0019] The opening and closing process of this valve is as follows:

[0020] When the valve is closed, actuator 17 rotates valve stem 5, driving butterfly plate 12 to the closed position. A gap now exists between butterfly plate 12 and valve seat 6. Adjusting bolt 24 is then rotated to tighten clamp 7, causing the valve seat and butterfly plate 12 to fit together and form a seal. When the valve is opened, adjusting bolt 24 is first rotated to loosen clamp 7. This forces the valve seat 6 to separate from the butterfly plate 12, lacking its tightening force. The valve can then be opened by rotating valve stem 5. This valve maintains contact between butterfly plate 12 and valve seat 6 during opening and closing, achieving frictionless opening and closing with minimal opening and closing torque, effectively extending the valve's service life.

[0021] In this embodiment, a sealing flap 9 is provided at the end of the butterfly plate 12 to form a seal with the valve seat 6. The sealing flap 9 and the butterfly plate 12 are detachably connected. An annular groove for mounting the sealing flap 9 is provided at the end of the butterfly plate 12. A pressure plate 10 and screws 11 are provided outside the annular groove. The pressure plate 10 fixes the sealing flap 9 to the butterfly plate 12 and is tightened by screws 11. After prolonged use of the valve, the sealing flap 9 will inevitably wear and require timely replacement to ensure the reliability of the valve seal. This structure allows replacement without removing the entire butterfly plate, making it easy to disassemble and assemble.

[0022] In this embodiment, a valve neck 13 is provided at the upper end of the valve body 1. A packing 15 is disposed between the valve neck 13 and the valve stem 5. A packing gland 16 is attached to the packing 15. The gland 16 is screwed to the valve body 1 to compress the packing 15, ensuring that the medium does not leak through the gap between the valve stem 5 and the valve body 1. A grease injection valve 14 is also provided at the valve neck 13 to facilitate the addition of lubricating grease to the side of the valve stem 5, ensuring the reliable opening and closing of the valve by the rotation of the valve stem.

[0023] In this embodiment, a lower valve cover 2 is provided at the lower end of the valve body 1, and a thermal insulation cleaning hole 3 is provided on the lower valve cover 2. By passing steam into the thermal insulation cleaning hole 3, the valve stem can be blown and cleaned to improve the performance. The lower valve cover is also provided with a grease injection valve 4 to facilitate the addition of lubricating grease to the bottom of the valve stem 5.

[0024] The embodiments should not be regarded as limiting the present invention, and any non-inventive improvements based on the spirit of the present invention should be regarded as falling within the protection scope of the present invention.

Claims

1. A low-torque butterfly valve, comprising a valve body, a valve stem, a butterfly plate, a valve seat, and an actuator. The butterfly plate is disposed within the valve body and forms a sealing engagement with the valve seat. The lower end of the valve stem is connected to the butterfly plate, and the upper end of the valve stem extends out of the valve body and is connected to the actuator. The valve is characterized in that: The valve body is provided with a mounting groove corresponding to the valve seat, a clamp is provided in the mounting groove, the clamp is provided on the outside of the valve seat, and the end of the clamp used for fastening extends out of the valve body.

2. A low torque butterfly valve according to claim 1, characterized in that: The clamp comprises an upper clamp and a lower clamp. The upper clamp and the lower clamp have the same structure and are semicircular. When closed, they are matched with the outer ring of the valve seat.

3. A low torque butterfly valve according to claim 2, characterized in that: A fastening portion is provided on the side of the upper clamp and the lower clamp, and the fastening portion extends out of the valve body. A screw hole is provided on the fastening portion, and an adjusting bolt is installed in the screw hole.

4. The low-torque butterfly valve according to claim 1, characterized in that: The end of the butterfly plate is provided with a sealing flap which forms a sealing match with the valve seat, and the sealing flap is detachably connected to the butterfly plate.

5. The low-torque butterfly valve according to claim 4, characterized in that: The end of the butterfly plate is provided with an annular groove for installing a sealing petal, and a pressing plate and screws are provided outside the annular groove. The pressing plate fixes the sealing petal and the butterfly plate and is fastened by screws.

6. The low-torque butterfly valve according to claim 1, characterized in that: A valve neck is provided at the upper end of the valve body, a packing is provided between the valve neck and the valve stem, a packing gland is provided on the packing, and the packing gland is connected to the valve body through screws to compress the packing.

7. The low-torque butterfly valve according to claim 6, characterized in that: The valve neck is provided with a grease injection valve.

8. The low-torque butterfly valve according to claim 1, characterized in that: A lower valve cover is provided at the lower end of the valve body, and a heat preservation and cleaning hole is provided on the lower valve cover.

9. The low-torque butterfly valve according to claim 8, characterized in that: The lower valve cover is provided with a grease injection valve.

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