Full-bore top-mounted bidirectional spherical sealing eccentric butterfly valve

Abstract

The utility model relates to a full-bore top-mounted bidirectional spherical sealing eccentric butterfly valve, which belongs to the field of valves and comprises a valve body 1, a valve seat 6, a valve plate 9, a valve rod, a valve cover 15 and a transmission device 18. A rectangular inner cavity is formed in a middle cavity of the valve body to form a top-mounted structure, the valve plate and the valve seat are assembled and disassembled from the rectangular inner cavity, the valve plate and the valve seat can be maintained and replaced by opening the valve cover, and the on-line maintenance function is achieved. The valve seat and the valve body channel form a full-bore structure; the rotating center line of the valve plate and the center line of the valve body are of eccentric structures, and friction between sealing faces in the opening and closing process is reduced. The propeller is arranged on the lower valve rod, when the valve plate is opened and closed, impurities deposited at the bottom of the valve cavity are automatically removed, and sediment is prevented from affecting the opening performance of the valve plate. The device has the advantages of convenience in overhaul and maintenance, high operation efficiency, small flow resistance, good sealing performance and the like.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the valve field especially relates to a two -way spherical seal eccentric butterfly valve. BACKGROUND

[0002] The butterfly valve is widely used in various industries medium conveying pipeline because of simple structure, convenient opening and closing. Such as the application number for CN202021064245.8 floating type two -way sealing butterfly valve, including valve body, valve seat, valve rod, butterfly plate and transmission mechanism, valve seat adopts floating type valve seat, when the positive medium pressure, butterfly plate is pressed tightly valve seat seal, when the reverse medium pressure, medium pushes valve seat and presses tightly butterfly plate seal, realizes two -way sealing function. Its main shortcomings are: butterfly plate and valve seat are loaded from the valve body passage, when the valve maintenance, replaces butterfly plate and valve seat, need to close the pipeline and remove the valve from the pipeline to overhaul, and the maintenance is troublesome, and influence pipeline system's operation efficiency;Valve seat is installed on the radial inner step of valve body passage, reduces the flow diameter, and the fluid produces greater flow resistance and energy loss;When the valve is closed for a long time, medium sundries is easy to deposit in the valve cavity, and the butterfly plate opening is affected. SUMMARY

[0003] The utility model discloses to the shortcoming of prior art, improve a full flow, upper -mounted structure, can automatically scrape off the valve cavity deposit when opening, and the full bore upper -mounted two -way spherical seal eccentric butterfly valve of easy maintenance, small flow resistance, reliable opening and closing is provided.

[0004] The technical scheme of the utility model is realized as follows:

[0005] A full bore upper -mounted two -way spherical seal eccentric butterfly valve, including valve body, valve seat, valve plate, valve rod, valve cover, transmission device, the valve rod is composed of concentric upper valve rod and lower valve rod;The upper and lower ears are respectively arranged on the upper and lower ends of the back surface of the valve plate sealing surface, the upper end of the upper valve rod is connected with the transmission device through the shaft hole of the valve cover, the lower end is fixedly connected with the upper ear, the upper end of the lower valve rod is fixedly connected with the lower ear, and the lower end is movably matched with the positioning hole at the bottom of the valve body;Its characterized in that: the inner hole of the valve seat and the through hole of the valve body flow passage have equal inner diameters, the valve seat sealing surface and the valve plate sealing surface are mutually matched spherical sealing surfaces;The middle cavity of the valve body has a rectangular inner cavity, the length of the rectangular inner cavity is greater than the outer diameter of the valve seat, and a flange connected with the valve cover is arranged on the upper end face of the rectangular inner cavity;The center line of the shaft hole of the valve cover and the center line of the valve body passage have an eccentric distance, and the center line of the shaft hole of the valve cover is located in front of the center line of the valve body in the closing direction of the valve plate;The propeller matched with the shape of the valve cavity bottom is fixedly arranged on the lower valve rod.

[0006] In the above technical scheme, the spherical sealing surface of the valve plate adopts the annular spherical sealing surface arranged on the outer circumference of the valve plate.

[0007] In the above technical scheme, the anti-punching step matched with the outer circular surface of the upper valve rod is arranged in the valve cover shaft hole.

[0008] In the above technical scheme, the floating valve seat structure is formed by adopting dynamic sealing cooperation between the outer circumference of the valve seat and the inner wall of the valve body passage.

[0009] The beneficial effects of the present utility model compared with the prior art are:

[0010] 1. The rectangular inner cavity is arranged in the middle cavity of the valve body to form an upper mounting structure, the valve plate and the valve seat are mounted and dismounted from the rectangular inner cavity, the valve plate and the valve seat can be maintained and replaced by opening the valve cover, the on-line maintenance function is realized, and the pipeline system operation efficiency is improved.

[0011] 2. The valve seat and the valve body passage form a full-bore structure, the flow resistance is small and the fluid energy loss is low after the valve plate is opened.

[0012] 3. The rotating center line of the valve plate and the center line of the valve body adopt an eccentric structure, the friction between the sealing surface of the valve plate and the sealing surface of the valve seat in the opening and closing process is reduced, the wear of the sealing surface is reduced, and the sealing performance of the sealing pair is improved.

[0013] 4. The propeller is arranged on the lower valve rod, the propeller is rotated by the lower valve rod when the valve plate is opened and closed, the impurities deposited at the bottom of the valve cavity are automatically removed, and the influence of the deposits on the opening performance of the valve plate is prevented. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a structural sectional view of the present utility model.

[0015] Figure 2 is a right view of the present utility model Figure 1 .

[0016] In the drawing: 1 valve body, 2 propeller, 3 bottom cover, 4 lower valve rod, 5 sealing ring, 6 valve seat, 7 spherical sealing ring, 8 lower lug, 9 valve plate, 10 upper valve rod, 11 upper lug, 12 annular spherical sealing surface, 13 shaft hole, 14 sealing gasket, 15 valve cover, 16 packing seal device, 17 support, 18 transmission device, H eccentric distance. DETAILED DESCRIPTION

[0017] As Figure 1The full-bore top-mounted bidirectional spherical seal eccentric butterfly valve shown includes a valve body 1, a valve seat 6, a valve plate 9, a valve stem, a valve cover 15, and a transmission device 18. The valve stem consists of a concentric upper valve stem 10 and a lower valve stem 4, meaning the center lines of the upper valve stem 10 and the lower valve stem 4 coincide. Upper lugs 11 and lower lugs 8 are provided at the upper and lower ends of the sealing surface of the valve plate 9. The upper end of the upper valve stem 10 passes through the shaft hole 13 of the valve cover 15 and connects to the transmission device 18, while the lower end is fixedly connected to the upper lug 11. The transmission device 18 is fixedly installed on the upper end of the valve cover 15 via a bracket 17. The upper end of the lower valve stem 4 is fixedly connected to the lower lug 8, and the lower end is movably fitted with a positioning hole at the bottom of the valve body 1. A bottom cover 3 is fixedly installed on the valve body 1 below the positioning hole. The valve seat 6 adopts a single-seat structure and is installed in the outlet channel of the valve body 1. After the valve is opened... Fluid flows through both sides of the valve plate 9 with very low flow resistance. Its characteristics include: the inner diameter of the valve seat 6 is equal to the flow channel through-hole of the valve body 1, forming a full-bore flow channel with the valve seat 6, reducing flow resistance and energy loss; the sealing surfaces of the valve seat 6 and valve plate 9 are mutually mating spherical sealing surfaces; the sealing surface of the valve seat 6 is formed by welding wear-resistant alloy onto the valve seat 6 and then grinding it to form a spherical sealing ring 7, improving the anti-erosion performance of the valve plate 9 after opening; the valve body 1 has a rectangular inner cavity, the length of which is greater than the outer diameter of the valve seat 6, allowing the valve seat 6 to be installed or removed from this rectangular inner cavity, forming a top-mounted structure; a flange connected to the valve cover 15 is provided on the upper end face of the rectangular inner cavity, and the valve cover 15 is fixedly installed on the upper end of the rectangular inner cavity of the valve body 1 via the flange. Figure 2 As shown, when the valve is under maintenance, only the valve cover 15 needs to be opened to repair or replace the valve plate 9 and valve seat 6, without disassembling the valve body 1 from the pipeline. This makes maintenance convenient. Furthermore, after removing the valve cover 15, a sealing cap is installed on the upper end of the rectangular inner cavity of the valve body 1, restoring the normal operation of the pipeline system and improving its efficiency. A sealing gasket 14 is placed between the valve cover 15 and the valve body 1. The centerline of the shaft hole 13 of the valve cover 15 has an eccentricity H with the centerline of the valve body 1 channel, creating an eccentric structure between the rotation centerline of the valve stem and valve plate 9 and the centerline of the valve body 1 channel. The centerline of the shaft hole 13 of the valve cover 15 is located in front of the centerline of the valve body 1 in the closing direction of the valve plate 9. Figure 2 As shown, when closed, the sealing surface of valve plate 9 and the sealing surface of valve seat 6 gradually wedge and seal, improving the sealing performance of the sealing pair. When opened, the sealing surface of valve plate 9 and the sealing surface of valve seat 6 disengage instantly, reducing friction and wear between the sealing surfaces and improving the sealing service life of the sealing pair. The sealing surface of valve seat 6; A propeller 2 that matches the shape of the bottom of the valve cavity is fixedly installed on the lower valve stem 4. When the valve is opened, the lower valve stem 4 drives the propeller 2 to rotate, automatically removing the deposits at the bottom of the valve cavity, preventing the deposits accumulated at the bottom of the valve cavity after the valve has been closed for a long time from affecting the opening of valve plate 9.

[0018] The spherical sealing surface of the valve plate 9 is composed of an annular spherical sealing surface 12 arranged on the outer circumference of the valve plate 9, which is formed by welding wear-resistant alloy on the outer circumference of the valve plate 9 and then grinding. During the opening and closing of the valve, the edge of the annular spherical sealing surface 12 automatically scrapes off the adhesive on the sealing surface of the valve seat 6, thereby reducing the wear between the sealing surfaces during the opening and closing.

[0019] A blow-out prevention step is arranged in the shaft hole 13 of the bonnet 15 and cooperates with the outer circumferential surface of the upper valve rod 10 to prevent the upper valve rod 10 from being blown out by high pressure medium. A packing seal device 16 is arranged between the upper end of the shaft hole 13 and the outer circumferential surface of the upper valve rod 10 to realize the sealing between the upper valve rod 10 and the bonnet 15.

[0020] The outer circumference of the valve seat 6 cooperates with the inner wall of the passage of the valve body 1 to form a floating valve seat structure, thereby realizing the bidirectional sealing function. The outer circumference of the valve seat 6 is embedded with a sealing ring 5, which cooperates with the inner wall of the passage of the valve body 1 to reduce the friction force of the axial movement of the valve seat 6. After the valve seat 6 and the valve body 1 are worn, only the sealing ring 5 needs to be replaced, thereby reducing the maintenance cost.

Claims

1. A full-bore top-mounted bidirectional spherical sealing eccentric butterfly valve, comprising a valve body (1), a valve seat (6), a valve plate (9), a valve stem, a valve cover (15), and a transmission device (18), wherein the valve stem is composed of a concentric upper valve stem (10) and a lower valve stem (4); the valve plate (9) has an upper lug (11) and a lower lug (8) on the back of its sealing surface; the upper end of the upper valve stem (10) passes through the shaft hole (13) of the valve cover (15) and is connected to the transmission device (18), and the lower end is fixedly connected to the upper lug (11); the upper end of the lower valve stem (4) is fixedly connected to the lower lug (8), and the lower end is movably fitted with the positioning hole at the bottom of the valve body (1); its characteristic is: The inner diameter of the valve seat (6) and the flow channel through hole of the valve body (1) are equal. The sealing surface of the valve seat (6) and the sealing surface of the valve plate (9) are spherical sealing surfaces that fit together. The middle cavity of the valve body (1) has a rectangular inner cavity. The length of the rectangular inner cavity is greater than the outer diameter of the valve seat (6). A flange that connects to the valve cover (15) is provided on the upper end face of the rectangular inner cavity. The center line of the shaft hole (13) of the valve cover (15) and the center line of the channel of the valve body (1) have an eccentricity (H). The center line of the shaft hole (13) of the valve cover (15) is located in front of the center line of the valve body (1) in the closing direction of the valve plate (9). A propeller (2) that fits with the bottom of the valve cavity is fixedly installed on the lower valve stem (4).

2. The full-bore top-mounted bidirectional spherical seal eccentric butterfly valve according to claim 1, characterized in that: The spherical sealing surface of the valve plate (9) is composed of an annular spherical sealing surface (12) set on the outer circumference of the valve plate (9).

3. The full-bore top-mounted bidirectional spherical seal eccentric butterfly valve according to claim 1 or 2, characterized in that: The outer circumference of the valve seat (6) and the inner wall of the valve body (1) are dynamically sealed to form a floating valve seat structure.

Images