Metal sealing butterfly valve

Abstract

The utility model relates to a metal sealing butterfly valve which is composed of a valve body, a connecting body, a valve seat, a butterfly plate, a valve rod, a fixing shaft, an end cover, a bearing, a thrust washer, a packing pressing plate, a packing gland, a semi-open ring and the like. The connector and the valve body are connected through a bolt, the sealing gasket is installed between the connector and the valve body, and the valve seat is placed between the connector and the valve body. The butterfly plate is connected with the fixing shaft in a split mode through the valve rod and is fixed through the pin shaft. A bearing is installed in the valve body, and a thrust washer is installed at the bottom, making contact with the fixing shaft, of the valve body. When the connecting body and the valve body are fixed, the valve seat is pressed on the valve body and the connecting body. The valve rod is rotated, the pin shaft drives the butterfly plate to rotate, the valve seat and the butterfly plate are tightly attached, and the sealing effect of the valve is achieved.

Description

Technical Field

[0001] The utility model relates to a metal sealing butterfly valve, which belongs to a valve used in the field of fluid control. Background Art

[0002] Valves are essential devices installed in fluid pipelines, used to open, close, or regulate the flow and pressure of the medium in the pipeline. Butterfly valves are compact, low-cost, and easy to maintain, making them widely used in real-world production. However, some harsh operating conditions in some installations and systems place high demands on butterfly valve performance.

[0003] Existing metal-sealed butterfly valves feature an integrated body and seat, making them difficult to replace. Long-term wear and tear of the seat, or creep of the seat material, can degrade sealing performance, necessitating replacement of the entire valve, increasing maintenance costs. Because the seat directly contacts the valve body's base metal, which has a low hardness, long-term compressive stress can damage the contact surface, leading to leakage. To address this, we offer a metal-sealed butterfly valve. Utility Model Content

[0004] In order to solve the above-mentioned technical defects, the utility model provides a metal sealing butterfly valve with a detachable valve seat.

[0005] To achieve the above objectives, the technical solution of the present utility model is a metal-sealed butterfly valve, which includes a valve body 1, an end cover 2, a thrust washer 3, a bearing 4, a connector 5, a fixed shaft 6, a valve seat 7, a butterfly plate 8, a pin 9, a bolt 10, a packing gland 11, a semi-open ring 12, a packing pressure plate 13, a packing bolt 14, a nut 15, a disc spring 16, a valve stem 17, a sealing gasket 18, a dust ring 19, etc. The valve seat 8 is tightly pressed against the contact surface by the valve body 1 and the connector 6. When the valve is closed, the sealing surface of the butterfly valve and the inner ring of the valve seat are tightly fitted to form a seal.

[0006] The metal sealing butterfly valve, the valve body 1 and the connector 5 are connected by bolts 10 and sealed by a sealing gasket 18. A valve seat 7 is placed in the annular groove formed by the valve body 1 and the connector 5, and the valve seat 7 is attached to the hard surface of the valve body 1 and the connector 5.

[0007] In the metal sealing butterfly valve, the butterfly plate 8 is connected to the valve stem 17 and the fixed shaft 6 through a pin 9, and a pressure relief hole is opened on the butterfly plate 8.

[0008] The metal sealing butterfly valve has a groove on the end cover 2, in which a thrust washer 3 is installed. After the fixed shaft 6 is connected to the butterfly plate 8, it contacts the thrust washer 3 to form sliding friction.

[0009] The metal sealing butterfly valve has an annular groove on the valve stem 17, in which a semi-open ring 12 is installed. The semi-open ring 12 can move in the annular space formed by the valve stem 17, the packing pressure plate 13 and the packing gland 11.

[0010] The metal sealing butterfly valve has multiple sets of disc springs 16 installed at the packing bolts 14 .

[0011] In the metal-sealed butterfly valve, the valve stem 17 and the fixed shaft 6 are supported by a long bearing design, and the bearing length is controlled to be 0.5 to 3 times the valve stem diameter.

[0012] The beneficial effects of the present invention are as follows: the valve body and connector of the metal-sealed butterfly valve are connected by bolts, which facilitates the disassembly and replacement of the valve seat; the contact surfaces between the valve body, connector and valve seat are hard surfaces, which can ensure the integrity of the contact surfaces even under high temperature and high pressure, thereby ensuring the reliability of the seal. A thrust washer is installed on the end cover. When the butterfly plate rotates, sliding friction occurs between the fixed shaft and the thrust washer, which effectively avoids direct wear between the end cover and the fixed shaft, increases the axial clearance, and causes increased wear on the main sealing surface. Multiple sets of disc springs are installed on the packing bolts to compensate for the packing compression force and prevent the packing from loosening and causing leakage. A semi-open ring is installed on the valve stem, so even if the pin shaft breaks, the valve stem will not be blown out. The bearing adopts a matching length of 0.5 to 3 times the valve stem diameter, which can ensure good valve performance while being very economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a main view of a metal sealed butterfly valve;

[0014] Figure 2 This is an enlarged schematic diagram of view I;

[0015] Figure 3 This is the enlarged schematic diagram of the butterfly plate pressure relief hole in view II;

[0016] In the figure, 1 valve body, 2 end cover, 3 thrust washer, 4 bearing, 5 connector, 6 fixed shaft, 7 valve seat, 8 butterfly plate, 9 pin shaft, 10 bolt, 11 packing gland, 12 semi-open ring, 13 packing pressure plate, 14 packing bolt, 15 nut, 16 disc spring, 17 valve stem, 18 sealing gasket, 19 dust ring DETAILED DESCRIPTION

[0017] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is described below using specific embodiments illustrated in the accompanying drawings. However, it should be understood that these descriptions are illustrative only and are not intended to limit the scope of the present invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessary confusion regarding the concepts of the present invention.

[0018] The specific implementation of this utility model is as follows:

[0019] Metal sealed butterfly valve, such as Figure 1 、 2As shown in Figure 3, the valve body 1 and the connector 5 are connected by bolts 10, and the connector 5 presses the valve seat 7. A sealing gasket 18 is installed between the valve body 1 and the connector 5. The butterfly plate 8 is connected to the valve stem 17 and the fixed shaft 6 through the pin 9. A bearing 4 is installed between the valve stem 17, the fixed shaft 6 and the valve body 1. A disc spring 16 is installed at the connection between the packing bolt 14 and the nut 15. A semi-open ring 12 is installed in the annular space formed by the valve stem 17, the packing gland 11 and the packing gland 13. When the butterfly plate 8 is closed, it fits tightly with the valve seat 7, thereby achieving sealing.

[0020] In this embodiment, the valve body 1 and connector 5 are connected by bolts 10. After being pre-tightened, the bolts 10 compress the valve seat 7 and cause it to elastically deform. During this compression and elastic deformation, the valve seat 7 slides on the contact surface and accumulates energy, ensuring a certain sealing force. By removing the bolts 10 and the connector 5, the valve seat 7 can be removed, thus enabling quick replacement of the valve seat 7. The surfaces of the valve body 1 and connector 5 are hardened to increase the hardness of the contact surface and enhance the reliability of the valve seal.

[0021] In this embodiment, a pressure relief hole is provided at the bottom of the connection between the butterfly plate 8, the valve stem 17, and the fixed shaft 6. Due to the small clearance, air can easily accumulate in the mounting hole when the butterfly plate 8 is mated with the valve stem 17 and the fixed shaft 6, making assembly difficult or impossible. The pressure relief hole in the butterfly plate balances the pressure inside and outside the butterfly plate hole, ensuring easy installation.

[0022] In this embodiment, sliding friction occurs between the fixed shaft 6 and the thrust washer 3 during rotation. Since the fixed shaft 6 and the thrust washer 3 have high hardness and small wear, the end cover 2 is protected from wear, the axial clearance of the valve stem is reduced, and increased wear of the sealing surface between the butterfly plate 8 and the valve seat 7 is avoided, which may cause valve leakage.

[0023] In this embodiment, an annular groove is formed on the valve stem 17, in which the semi-open ring 12 is mounted. The packing gland 11 and the packing pressure plate 13 limit the movement space of the semi-open ring 12. When the valve stem 17 breaks accidentally in the valve body, the valve stem 17 is protected from flying out.

[0024] In this embodiment, multiple groups of disc springs 16 are installed at the connection between the packing bolts 14 and the nuts 15. After compression, the disc springs 16 provide a certain pre-tightening force to the packing bolts 14 to compensate for the loosening of the packing bolts 14 caused by the loss of packing and ensure that the packing is always compressed.

[0025] In this embodiment, the valve stem 17 and the fixed shaft 6 rotate via bearing 4. The contact surfaces are hardened, and the fitting length of the bearing 5 is guaranteed to be within a range of 0.5 to 3 times the valve stem diameter. This ensures flexible rotation of the valve stem 17 and the fixed shaft 6 while maintaining excellent economic efficiency. Furthermore, a groove is formed in the bearing 5, and a dust ring 19 is installed in the groove to prevent impurities and other particulate matter from entering between the bearing 5 and the valve stem 17, thereby preventing rotational failure of the valve stem 17.

[0026] This embodiment is only an illustrative description of this patent and does not limit its scope of protection. Those skilled in the art may also make partial changes to it. As long as it does not exceed the spirit of this patent, it is within the scope of protection of this patent.

Claims

1. A metal sealed butterfly valve, characterized by It consists of a valve body, a connector, a valve seat, a butterfly plate, a valve stem, a fixed shaft, an end cover, a bearing, a thrust washer, a semi-open ring, a pin shaft, a packing gland and a packing pressure plate; the valve body and the connector form an annular groove, in which the valve seat is placed, and the valve seat is mechanically pressed against the valve body and the connector; bearings are installed in the upper and lower chambers of the valve body, the valve stem passes through the upper chamber bearing and rotates therein, and the fixed shaft passes through the lower chamber bearing and rotates therein; the valve stem is grooved with a semi-open ring inside, and the valve stem, packing pressure plate, packing pressure plate and semi-open ring together form a valve stem anti-blowout structure; the fixed shaft is axially limited by the fixed shaft shoulder, thrust washer and end cover, and the valve stem and the fixed shaft are connected and fixed to the butterfly plate by a pin shaft, thereby transmitting torque; when the butterfly plate is closed to the closed position, the sealing surface of the butterfly plate fits against the inner ring of the valve seat. The greater the closing force, the tighter the fit.

2. A metal-sealed butterfly valve according to claim 1, characterized in that: The connector and valve body are connected by bolts, and the valve seat is pressed tightly at the same time. The surfaces of the valve body and connector that are in contact with the valve seat are hardened.

3. The metal-sealed butterfly valve according to claim 1, characterized in that: There is a pressure relief hole on the butterfly plate.

4. The metal-sealed butterfly valve according to claim 1, characterized in that: The fixed shaft has a shaft shoulder, and a thrust washer is installed at the end cover that contacts the fixed shaft.

5. The metal-sealed butterfly valve according to claim 1, characterized in that: Multiple sets of disc springs are installed at the packing bolts.

6. The metal-sealed butterfly valve according to claim 1, characterized in that: The matching lengths of the bearing, valve stem and fixed shaft are 0.5 to 3 times the valve stem diameter respectively.

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