A horizontal full-diameter two-way eccentric hemispherical valve

Abstract

The invention discloses a horizontal full-diameter bidirectional eccentric hemispherical valve, comprising a valve body, an eccentric hemispherical valve arranged in a valve cavity of the valve body, an inlet end and an outlet end arranged at the left and right ends of the valve body, a floating valve seat arranged at the outlet end, a main sealing ring and a ball crown arranged on the eccentric hemispherical valve, a sealing pair formed by the floating valve seat and the main sealing ring, a first pressure chamber arranged between the inner side of the main sealing ring and the eccentric hemispherical valve, and a second pressure chamber arranged between the end face of the floating valve seat and the valve body. The front and rear ends of the eccentric hemispherical valve are respectively connected with a front valve stem and a rear valve stem, the eccentric hemispherical valve, the front valve stem and the rear valve stem form a valve shaft, the valve shaft is in a horizontal direction, a valve cover is arranged on the upper part of the valve body, an arc bottom matching the inner circle of the diameter is arranged at the lower end of the valve body, and the eccentric hemispherical valve forms a full-circle flow channel with the arc bottom after opening. The invention adopts a horizontal structure, has a small height, is easy to maintain by opening the cover, and realizes the online maintenance function; the flow channel is unobstructed, the water loss is small, and there is no impurity accumulation; the forward and reverse seals are suitable for circulating water and various special working conditions.

Description

Technical Field

[0001] The invention relates to the technical field of valves, in particular to a horizontal full-diameter bidirectional eccentric hemispherical valve. Background Art

[0002] At present, the eccentric semi-ball valves on the market are basically designed and produced according to the "GB / T26146-2010 Eccentric Semi-ball Valve" standard. The "GB / T26146-2010 Eccentric Semi-ball Valve" standard only has two typical structures of semi-ball valves: side-mounted and top-mounted. The valve shafts are all installed vertically. After long-term use, a large amount of impurities will accumulate on the lower valve shaft, which will increase the opening and closing torque, damage the shaft end seal, and cause the valve to leak. In the drinking water system, the impurities will ferment for a long time, causing the water to deteriorate, affecting hygiene.

[0003] For example, if a vertical semi-ball valve is changed to a horizontal installation, since the semi-ball valve has support feet, the support feet are in the axial direction, and the valve body is a casting, the model must be modified, and mold repair is very difficult. Therefore, when there are special requirements, horizontal support feet are usually only temporarily installed; and the valve body of the vertical semi-ball valve is a symmetrical sphere, the valve body height will increase a lot, and a small amount of impurities will accumulate in the lower part of the sphere, which cannot completely solve the problem.

[0004] The side-mounted structure in the standard "GB / T26146-2010 Eccentric Semi-ball Valve" cannot be repaired online, and if the top-mounted structure is changed to horizontal installation, it is quite difficult to remove the valve cover and valve shaft during online maintenance. Large-sized semi-ball valves cannot be lifted at all because the valve cover and valve shaft are too heavy. If the online maintenance function is sacrificed and the horizontal installation is changed, users generally will not agree.

[0005] The online maintenance function of the upper structure in the standard "GB / T26146-2010 Eccentric Semi-ball Valve" is only a theoretical function. For maintenance, the drive device, valve cover, valve shaft, and eccentric semi-ball need to be disassembled, and only the ball crown can be replaced, but the valve seat and main sealing ring cannot be replaced. The main sealing ring is a rubber part and is a wearing part. Moreover, even if it is replaced, the center cannot be found on the pipeline because the valve shaft needs to be reassembled. Debugging is also very difficult and time-consuming, and the effect is unpredictable. Therefore, the online maintenance function of the upper structure only remains in the bidding stage and has no practical significance. If the seal leaks after long-term use, it is generally necessary to replace a new valve or dismantle the entire valve for overhaul, rather than online maintenance.

[0006] At present, the eccentric semi-ball valves on the market are basically designed with medium-short structure and reduced diameter according to the standard "GB / T26146-2010 Eccentric Semi-ball Valve". The short structure is short in length, the flange hole cannot be drilled into a through hole, and a part of the bolts connecting the middle port are blind holes. If the blind hole thread is damaged, the valve body will be scrapped. In addition, the blind hole of the flange bolt is short and the through hole is long, and the lengths are different, which is very easy to make mistakes.

[0007] The short structure can only be produced with a reduced diameter (less than 80% of the nominal diameter) because the valve seat occupies a certain flow channel space and the flange position cannot be staggered. The reduced diameter flow area is only less than 64% of the full diameter flow area, which greatly reduces the flow capacity of the hemispherical valve, increases the flow resistance coefficient and water loss by 4 times, and the flow coefficient is only 1 / 3 of the full diameter. Some companies on the market reduce the thickness of the valve seat wall to increase the inner diameter of the valve seat, which can only reach 90% of the nominal diameter at most, and make the outlet into a trumpet shape to pass the bid and pretend to be full diameter, which is just fraudulent and the flow capacity is still insufficient.

[0008] Due to the existence of eccentricity, the higher the pressure, the better the sealing performance of the eccentric semi-ball valve is, and it has self-sealing properties. However, this is limited to forward sealing. For reverse sealing, the eccentricity is a huge defect that is difficult to overcome. At present, the eccentric semi-ball valves on the market are basically one-way seals. One-way sealing valves cannot seal reverse water pressure in circulating water systems, so their use is limited. In addition, during the user's installation process, it is easy to install the wrong direction, especially at the water pump outlet. The sealing direction is backflow water pressure, and the installation direction is often wrong. For large-sized semi-ball valves, a crane is required for installation, and the re-installation project is very large.

[0009] In addition, in the "GB / T26146-2010 Eccentric Hemisphere Valve" standard, there is a pressure ring behind the valve seat to prevent the valve seat from floating. The eccentric hemisphere is tightly pressed on the valve seat, and the opening and closing torque is very large. Under high pressure, the deformation of the eccentric hemisphere will damage the sealing surface, causing seal failure.

[0010] The main sealing ring in the standard "GB / T26146-2010 Eccentric Semi-ball Valve" refers to the structure of an ordinary ball valve and is installed on the valve seat. When the valve is opened, the main sealing ring is exposed to the water flow, which causes long-term erosion and severe cavitation, affecting the valve sealing performance and shortening its service life.

[0011] Some companies in the market use butterfly valve sealing structure, the main sealing ring is designed as a toothed breathing ring, and some are designed as a triangular ring. The toothed breathing ring is easy to be flushed out, and it cannot be sealed after being flushed out. The triangular ring sealing surface is too small, wears quickly, and has a short service life. Summary of the invention

[0012] The purpose of the present invention is to provide a horizontal full-diameter bidirectional eccentric hemispherical valve in view of the above-mentioned deficiencies in the prior art.

[0013] To solve the above problems, the technical solution adopted by the present invention is:

[0014] A horizontal full-diameter, two-way eccentric hemispheric valve comprises a valve body, an eccentric hemispheric valve cavity of the valve body is provided with an eccentric hemispheric valve, the front and rear ends of the eccentric hemispheric valve are respectively connected with a front valve stem and a rear valve stem, the end of the front valve stem passes through the valve body and is connected with a driving device; the left and right ends of the valve body are respectively provided with an inlet end and an outlet end, the outlet end is provided with a floating valve seat, the eccentric hemispheric valve is provided with a mounting groove, a main sealing ring and a ball crown for pressing and fixing the main sealing ring are provided in the mounting groove, a first pressure chamber is provided between the inner side of the main sealing ring and the eccentric hemispheric valve, a flow channel is provided between the inner side of the ball crown and the eccentric hemispheric valve, the first pressure chamber is connected with the outlet end through the flow channel, and the main sealing ring cooperates with the floating valve seat to form a sealing pair.

[0015] Furthermore, a second pressure chamber is circumferentially arranged between the outer end surface of the floating valve seat and the valve body, and the second pressure chamber is communicated with the outlet end.

[0016] Furthermore, a buffer gasket is provided between the floating valve seat and the valve body.

[0017] Furthermore, a support washer is provided between the buffer gasket and the valve body, a screw hole is opened on the valve body at the outlet end along the inlet and outlet flow direction of the valve body, a top screw is provided in the screw hole, and the top screw abuts against the support washer.

[0018] Furthermore, a limiting groove is provided on the valve body at a position corresponding to the floating valve seat, and the floating valve seat is slidably disposed in the limiting groove.

[0019] Furthermore, a screw hole is provided on the floating valve seat, a limiting bolt is threadedly connected to the screw hole, a limiting groove is provided at a position corresponding to the limiting bolt on the valve body, and the lower end of the limiting bolt is slidably disposed in the limiting groove.

[0020] Furthermore, the valve body is arranged horizontally, the front valve stem and the rear valve stem are arranged horizontally, an upper loading port is arranged on the upper part of the valve body, a valve cover is arranged at the upper loading port, and a central axis of the valve cover is perpendicular to the axis of the front valve stem.

[0021] Furthermore, the bottom of the valve body is an arc-shaped bottom that matches the inner circle of the valve body diameter.

[0022] Furthermore, baffles are provided at the inner ends of the front valve stem and the rear valve stem, the baffles are located in the valve cavity, and the diameter of the baffles is larger than the diameter of the front valve stem and the rear valve stem.

[0023] Furthermore, the main sealing ring adopts a mountain-shaped sealing ring, which includes a main sealing part in the middle and branch sealing parts on both sides. The main sealing part abuts against the floating valve seat, one side of the branch sealing part is clamped in the installation groove, and the ball crown is pressed against the other side branch sealing part.

[0024] Furthermore, the top of the main sealing portion protrudes outward to form an arc curved surface.

[0025] The beneficial effects of adopting the above technical solution are:

[0026] The overall structure of the horizontal eccentric hemispherical valve of the present invention is designed to be horizontal. The eccentric hemispherical valve, the front valve stem and the rear valve stem form a valve shaft. Valve shaft supporting holes are designed on both sides of the valve body. The valve shaft is assembled horizontally. The lower end of the valve body is designed to be an arc-shaped bottom that is highly consistent with the inner circle of the diameter. After the eccentric hemispherical valve is opened, a full-circle flow channel is formed with the arc-shaped bottom. The flow channel is similar to the circular cross-section of the pipeline, and the flow resistance coefficient is similar to 0. It not only completely solves the problem of impurity accumulation, but also has strong flow capacity, small flow resistance coefficient, and a flow coefficient equivalent to that of the pipeline. At the same time, for large-sized eccentric hemispherical valves, the installation height is small, and the driving device is on the side, which is easy to operate.

[0027] Rapid replacement of the main seal ring of the wearing part realizes the real online maintenance function: there is a valve cover on the upper end of the valve body, which is round (different from the oval shape), with good pressure bearing capacity, beautiful appearance, good processing technology, easy quality control, and convenient processing; the round valve cover can be processed by ordinary lathe, which is easy, and only requires standard parts - valve cover O-ring seal, and does not need to open molds to make special oval seals. In addition, the valve stem is not installed on the valve cover, which is very convenient to disassemble. This valve cover is specially designed for maintenance. You only need to remove the valve cover bolts and open the valve cover to replace the main seal ring. There is no need to remove the valve shaft and eccentric hemisphere. Large-sized hemisphere valves do not require lifting equipment. The replacement time is extremely short and very convenient. After replacement, the valve cover can be installed and used normally. Because the valve stem has not moved, the installation position of the main seal ring is exactly the same as when it left the factory and does not need to be adjusted.

[0028] Replace the valve stem end seal without stopping water: The front valve stem and the rear valve stem are both installed on the valve body. Not only are there sealing rings on the valve stem, but also the blind cap at the rear end of the rear valve stem and the pressure cap at the front end of the front valve stem are equipped with sealing rings. When leakage occurs, the sealing ring can be replaced by removing the blind cap or the pressure cap to ensure the normal operation of the valve without stopping water.

[0029] There are anti-breakout baffles on the inner side of the upper and lower valve shafts. The advantage is that when the water is not stopped, the valve stem will not be rushed out due to pressure after the blind cover or the pressure cover is removed, and the baffle can prevent danger.

[0030] At the same time, the front valve stem and the rear valve stem have their own shaft hole supports, and their own shaft end baffles are axially positioned. When there is pressure, there will be no drift, the center of the eccentric hemisphere remains unchanged, and the main sealing ring is not affected, ensuring the stability of the main seal when the valve cover is removed for online maintenance.

[0031] Replace the valve seat: The floating valve seat is made of stainless steel. It is very hard and erosion-resistant after heat treatment and generally does not need to be replaced. Because the eccentric hemisphere can rotate 180°, when the eccentric hemisphere rotates to the inlet position, there is enough space to take the valve seat out of the valve cover, and online maintenance can also be achieved.

[0032] This eccentric hemispherical valve is designed in accordance with the standard medium-long structure of "GB / T26146-2010 Eccentric Hemispherical Valve". All flange holes are drilled into through holes. Flange bolts are of uniform length and matched with nuts. There are no threaded holes on the valve body. If the thread is damaged, only the nut needs to be replaced without affecting the valve body. Some specifications can be installed with flange bolts from the valve body side.

[0033] This eccentric semi-ball valve is designed according to the full-diameter standard of "GB / T26146-2010 Eccentric Semi-ball Valve". In special cases, it can be designed according to the nominal diameter. The flow area reaches 100%, with strong flow capacity, small flow resistance coefficient and water loss, which is equivalent to the same diameter pipeline; it gives full play to the flow advantage of ball valves and completely replaces the cut-off valve with the largest market share - gate valve. Gate valves are generally only produced with a diameter below DN1000, while semi-ball valves have been produced with a diameter above DN2000. At the same time, for large-size eccentric semi-ball valves, the installation height is small, and the drive device is on the side, which is easy to operate.

[0034] In the present invention, the main sealing ring is installed on the eccentric hemisphere and assembled with a ball crown. When the valve is opened, the main sealing ring is hidden on the side of the valve cavity and is not washed by the medium. It is well protected and has a long service life.

[0035] The main sealing ring in the present invention is designed as a mountain-shaped sealing ring, which has good interchangeability, good strength, high pressure bearing, reliable sealing and is suitable for mass production.

[0036] The floating valve seat in the present invention is designed to float axially and cooperate with the main sealing ring to form a sealing pair. The floating valve seat and the main sealing ring are adjusted, and the interference of the main sealing ring provides an initial sealing pressure ratio to achieve low-pressure sealing.

[0037] The present invention is designed for bidirectional sealing. During positive sealing, the positive water pressure pushes the eccentric hemisphere to move toward the outlet end. Due to the existence of the eccentric distance, the higher the pressure, the better the sealing performance. It has self-sealing properties. At the same time, the buffer gasket is compressed to offset the deformation of the eccentric hemisphere, which not only avoids crushing the main sealing ring, but also reduces the opening and closing torque.

[0038] When reverse sealing: the reverse water pressure pushes the eccentric hemisphere to move toward the inlet end. The higher the pressure, the worse the sealing performance. The main sealing ring of this eccentric hemisphere valve is installed on the eccentric hemisphere and assembled with a ball crown. The compression of the main sealing ring can be adjusted. At the same time, a groove is designed at the inner end of the main sealing ring to form a first pressure chamber. The water pressure of the first pressure chamber pushes the main sealing ring to move toward the floating valve seat. The higher the pressure, the greater the thrust; the reverse water pressure pushes the eccentric hemisphere to move toward the inlet end. The higher the pressure, the worse the sealing performance. The floating valve seat of this eccentric hemisphere valve is designed to float axially. At the same time, there is a second pressure chamber on the rear side of the floating valve seat. The water pressure of the second pressure chamber pushes the floating valve seat to move toward the inlet end. The axial displacement is greater than the displacement of the eccentric hemisphere. The higher the pressure, the greater the thrust; under the action of these two forces, the sealing performance is reliable and neither is indispensable. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic diagram of the valve closed state of the present invention;

[0040] Figure 2 yes Figure 1 A magnified view of part A;

[0041] Figure 3 It is a schematic diagram of the valve opening state of the present invention.

[0042] In the figure: 1. valve body; 2. eccentric hemisphere; 3. front valve stem; 4. rear valve stem; 5. inlet end; 6. outlet end; 7. floating valve seat; 8. main sealing ring; 81. main sealing part; 82. branch sealing part; 9. ball crown; 10. first pressure chamber; 11. flow channel; 12. support gasket; 13. second pressure chamber; 14. buffer gasket; 15. top screw; 16. limit groove; 17. limit bolt; 18. baffle; 19. valve cover; 20. drive device; 21. blind cover; 22. pressure cover. DETAILED DESCRIPTION

[0043] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0044] like Figure 1-3As shown, it is a specific embodiment of a horizontal full-diameter bidirectional eccentric hemispherical valve of the present invention, comprising a valve body 1, an eccentric hemispherical ball 2 is arranged in the valve cavity of the valve body 1, the front and rear ends of the eccentric hemispherical ball 2 are respectively connected with a front valve stem 3 and a rear valve stem 4, a shaft sleeve is arranged between the front valve stem 3 and the rear valve stem 4 and the valve body, and the end of the front valve stem 3 passes through the valve body 1 and is connected to the driving device 20; the left and right ends of the valve body 1 are respectively provided with an inlet end 5 and an outlet end 6, and a floating valve seat 7 is arranged at the outlet end 6. The eccentric hemisphere 2 is provided with a mounting groove, in which a main sealing ring 8 and a ball crown 9 for pressing and fixing the main sealing ring 8 are provided, and the ball crown 9 is fixed on the eccentric hemisphere 2 by screws, and a first pressure chamber 10 is provided between the inner side of the main sealing ring 8 and the eccentric hemisphere 2, and a flow channel 11 is provided between the inner side of the ball crown 9 and the eccentric hemisphere 2, and the first pressure chamber 10 is connected with the outlet end through the flow channel 11, and the main sealing ring 8 cooperates with the floating valve seat 7 to form a sealing pair. In the present invention, the main sealing ring 8 is installed on the eccentric hemisphere 2 and assembled with the ball crown 9. When the valve is opened, the main sealing ring 8 is hidden in the side of the valve chamber, is not washed by the medium, is well protected, and has a longer service life.

[0045] Furthermore, a second pressure chamber 13 is circumferentially provided between the outer end surface of the floating valve seat 7 and the valve body 1 , and the second pressure chamber 13 is communicated with the outlet end 6 .

[0046] Furthermore, a buffer gasket 14 is provided between the floating valve seat 7 and the valve body 1. The buffer gasket 14 is a rubber buffer gasket. When positive sealing is performed, the buffer gasket is compressed to offset the deformation of the hemispherical valve, thereby avoiding damage to the main sealing ring 8 and reducing the opening and closing torque.

[0047] Furthermore, a support washer 12 is provided between the buffer gasket 14 and the valve body 1, a screw hole is provided on the valve body 1 at the outlet end 6 along the inlet and outlet flow direction of the valve body 1, a top screw 15 is provided in the screw hole, the top screw 15 abuts against the support washer 12, the support washer 12 serves as a force support to prevent the top screw from directly abutting against the buffer gasket, and the second pressure chamber is located between the support washer 12 and the valve body 1. The position of the floating valve seat is adjusted by the top screw 15 to ensure the sealing effect.

[0048] Furthermore, a limiting groove 16 is provided on the valve body 1 at a position corresponding to the floating valve seat 7 , and the floating valve seat 7 is slidably disposed in the limiting groove 16 .

[0049] Furthermore, a screw hole is provided on the floating valve seat 7, and a limiting bolt 17 is threadedly connected to the screw hole. A limiting groove 16 is provided at a position corresponding to the limiting bolt 17 on the valve body 1, and the lower end of the limiting bolt 17 is slidably provided in the limiting groove 16. The provision of the limiting bolt 17 can both ensure that the floating valve seat 7 floats axially and prevent the floating valve seat 7 from being washed away by the medium.

[0050] Furthermore, the valve body 1 is arranged horizontally, and the eccentric hemisphere, the front valve stem and the rear valve stem form a valve shaft, which is parallel to the valve mounting surface and in a horizontal direction. The upper portion of the valve body 1 is provided with an upper mounting port, and a valve cover 19 is provided at the upper mounting port, and the central axis of the valve cover 19 is perpendicular to the axis of the front valve stem 3. The valve cover is circular (different from an elliptical shape), has good pressure bearing capacity, beautiful appearance, good processing technology, easy quality control, and convenient processing; the circular valve cover can be processed by an ordinary lathe, which is less difficult, and only requires a standard part - a valve cover O-ring seal, and does not require a mold to make a special elliptical seal ring. In addition, the valve stem is not installed on the valve cover, and it is very convenient to disassemble. This valve cover is specially designed for maintenance. You only need to remove the valve cover bolts and open the valve cover to replace the main sealing ring. The floating valve seat is assembled from the center valve cover and can be repaired online without removing the valve shaft and eccentric hemisphere. Large-sized hemispheric valves do not require lifting equipment. The replacement time is extremely short and very convenient. After replacement, the valve cover can be installed for normal use. Because the valve stem has not moved, the installation position of the main sealing ring is exactly the same as when it leaves the factory and does not need to be adjusted.

[0051] Furthermore, the bottom of the valve body 1 is an arc-shaped bottom that matches the inner diameter of the valve body 1. After the eccentric hemisphere is opened, a full-circle flow channel is formed with the arc-shaped bottom. The flow channel is similar to the circular cross-section of the pipeline, and the flow resistance coefficient is close to 0, which not only completely solves the problem of impurity accumulation, but also has strong flow capacity, small flow resistance coefficient, and flow coefficient equivalent to the pipeline. At the same time, for large-sized eccentric hemisphere valves, the installation height is small, and the drive device is on the side, which is easy to operate.

[0052] Furthermore, the main sealing ring 8 adopts a mountain-shaped sealing ring, which includes a main sealing part 81 in the middle and branch sealing parts 82 on both sides. The main sealing part 81 is abutted against the floating valve seat 7, and the branch sealing part 82 on one side is clamped in the installation groove. The ball crown 9 is pressed on the branch sealing part 82 on the other side to fix the main sealing ring 8 in the installation groove.

[0053] Furthermore, the top of the main sealing portion 81 protrudes outward to form an arc surface, which abuts against the floating valve seat, and has reliable sealing, simple structure, good interchangeability and high strength.

[0054] Furthermore, a baffle 18 is provided at the inner end of the front valve stem 3 and the rear valve stem 4. The baffle 18 is located in the valve cavity. The diameter of the baffle 18 is larger than the diameter of the front valve stem 3 and the rear valve stem 4. The baffle 18 can prevent the front valve stem 3 and the rear valve stem 4 from flying out and injuring people when under pressure.

[0055] Furthermore, the outer end of the rear valve stem 4 is provided with a blind cap 21 connected to the valve body by bolts, the inner end of the blind cap 21 is inserted into the valve body, a sealing ring is provided between the blind cap 21 and the valve body, and the outer end of the front valve stem 3 is provided with a gland 22, a sealing ring is provided between the gland 22 and the valve body, when leakage occurs, the blind cap or gland can be removed to replace the sealing ring, ensuring the normal operation of the valve without stopping water. The blind cap 21 and gland 22 play an adjustment role, and the center of the eccentric hemisphere can be adjusted to be consistent with the center of the valve body.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A horizontal full-diameter bidirectional eccentric hemispherical valve, comprising a valve body (1), an eccentric hemispherical valve (2) being arranged in a valve cavity of the valve body (1), a front valve stem (3) and a rear valve stem (4) being connected to the front and rear ends of the eccentric hemispherical valve (2), respectively, the end of the front valve stem (3) passing through the valve body (1) and being connected to a driving device (20); an inlet end (5) and an outlet end (6) being arranged at the left and right ends of the valve body (1), respectively, a floating valve seat (7) being arranged at the outlet end (6), and characterized in that: The eccentric hemisphere (2) is provided with a mounting groove, a main sealing ring (8) and a ball crown (9) for pressing and fixing the main sealing ring (8) are provided in the mounting groove, a first pressure chamber (10) is provided between the inner side of the main sealing ring (8) and the eccentric hemisphere (2), a flow channel (11) is provided between the inner side of the ball crown (9) and the eccentric hemisphere (2), the first pressure chamber (10) is connected with the outlet end (6) through the flow channel (11), and the main sealing ring (8) cooperates with the floating valve seat (7) to form a sealing pair; The bottom of the valve body (1) is an arc-shaped bottom that matches the inner diameter of the valve body (1); The inner ends of the front valve stem (3) and the rear valve stem (4) are provided with baffles (18), the baffles (18) are located in the valve cavity, and the diameter of the baffles (18) is larger than the diameter of the front valve stem (3) and the rear valve stem (4).

2. A horizontal full-diameter bidirectional eccentric hemispherical valve according to claim 1, characterized in that: A second pressure chamber (13) is provided between the outer end surface of the floating valve seat (7) and the valve body (1) along the circumferential direction, and the second pressure chamber (13) is communicated with the outlet end (6).

3. A horizontal full-diameter bidirectional eccentric hemispherical valve according to claim 2, characterized in that: A buffer gasket (14) is provided between the floating valve seat (7) and the valve body (1).

4. A horizontal full-diameter bidirectional eccentric hemispherical valve according to claim 1, characterized in that: The valve body (1) is arranged horizontally, the front valve stem (3) and the rear valve stem (4) are arranged horizontally, an upper mounting opening is arranged at the upper part of the valve body (1), a valve cover (19) is arranged at the upper mounting opening, and the central axis of the valve cover (19) is perpendicular to the axis of the front valve stem (3).

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