Eccentric semi-ball valve

Abstract

The utility model belongs to the field of valves, and particularly discloses an eccentric semi-ball valve which comprises a valve body and a semi-ball valve clack. An inlet, a valve cavity and an outlet which are communicated are formed in the valve body, the semi-ball valve clack is located in the valve cavity, the outer side of the semi-ball valve clack is detachably connected with a first sealing piece, and the semi-ball valve clack rotates to be used for communicating or closing the inlet and the outlet; a valve port communicated with the valve cavity is formed in the valve body, an upper valve seat is fixedly connected to the valve port, a valve cover is detachably connected to the top of the upper valve seat, a valve rod is arranged on the valve cover in a penetrating mode, a driving assembly used for driving the valve rod to ascend and descend is arranged on the valve cover, a liftable sealing valve seat is arranged in the upper valve seat, and the valve rod ascends and descends to drive the liftable sealing valve seat to ascend and descend; after the eccentric semi-ball valve is completely opened, the liftable sealing valve seat descends to abut against the semi-ball valve clack for sealing, so that a closed cavity is formed between the valve deck and the semi-ball valve clack, and the first sealing piece is located in the closed cavity. By means of the semi-ball valve, the sealing ring on the semi-ball valve clack can be replaced when the valve is in an open state.

Description

Technical Field

[0001] The present application belongs to the field of valves, and more specifically, relates to an eccentric hemispherical valve. Background Art

[0002] Eccentric hemispherical valves are often used in pipelines that transport liquids or gases. Their primary function is to cut off, distribute and change the flow speed and direction of the medium in the pipeline. The closing part of the eccentric hemispherical valve is a hemispherical valve disc, which is rotated to open or close the valve.

[0003] In the related technology, a sealing ring is usually provided on the hemispherical valve disc to improve the sealing performance. When the hemispherical valve disc moves to be perpendicular to the pipeline, the valve is completely closed, completely cutting off the flow of the medium in the pipeline; when the hemispherical valve disc moves to be parallel to the pipeline, the valve is fully opened, the ball is hidden above the flow channel, the channel is completely connected, and the medium flow rate is maximized.

[0004] During the use of the eccentric semi-ball valve, the sealing ring will be worn, causing the valve to leak and need to be replaced. When replacing the sealing ring, it is necessary to close the valves before and after the pipeline to stop the water supply. However, in some scenarios, the pipeline does not allow water supply to be stopped. The sealing ring cannot be replaced when the eccentric semi-ball valve is open, resulting in the leakage problem caused by the damaged sealing ring cannot be solved in time. Summary of the invention

[0005] In view of the defects of the prior art, the present application provides an eccentric hemispherical valve, which aims to solve the problem that the sealing ring of the eccentric hemispherical valve cannot be replaced when the eccentric hemispherical valve is in an open state.

[0006] An eccentric hemispherical valve provided in the present application specifically comprises a valve body and a hemispherical valve disc; the valve body is provided with a connected inlet, a valve cavity and an outlet, the hemispherical valve disc is located in the valve cavity, and a first sealing member is detachably connected to the outer side of the hemispherical valve disc, and the hemispherical valve disc rotates to connect or close the inlet and the outlet; the valve body is provided with a valve port connected to the valve cavity, an upper valve seat is fixedly connected to the valve port, a valve cover is detachably connected to the top of the upper valve seat, a valve stem is passed through the valve cover, and a driving component for driving the valve stem to rise and fall is provided on the valve cover, a liftable sealing valve seat is provided in the upper valve seat, and the valve stem is raised and lowered to drive the liftable sealing valve seat to rise and fall; after the eccentric hemispherical valve is fully opened, the liftable sealing valve seat descends and abuts against the hemispherical valve disc for sealing, so that a closed cavity is formed between the valve cover and the hemispherical valve disc, and the first sealing member is located in the closed cavity.

[0007] The above technical scheme conceived by the present application, compared with the prior art, when the hemispherical valve disc rotates to fully open the eccentric hemispherical valve, the valve cover is provided with a driving assembly that can drive the valve stem to rise and fall, thereby driving the liftable sealing valve seat to move, so that the liftable sealing valve seat descends and abuts against the hemispherical valve disc for sealing, and a closed cavity is formed between the valve cover and the hemispherical valve disc, and the first sealing component is located in the closed cavity, which can achieve the beneficial effect of replacing the first sealing component when the eccentric hemispherical valve is in the open state.

[0008] As a further preference, a plurality of guide rods are fixedly connected inside the upper valve seat, the axial direction of the guide rods is the same as the moving direction of the liftable sealing valve seat, and the liftable sealing valve seat is provided with through holes for the guide rods to pass through.

[0009] As a further preference, a sealing ring is arranged between the liftable sealing valve seat and the upper valve seat.

[0010] As a further preferred embodiment, a plurality of limit screws are detachably connected to the upper valve seat, and the limit screws are used to position the liftable sealing valve seat when the liftable sealing valve seat abuts against the hemispherical valve disc.

[0011] As a further preferred embodiment, a beam plate is fixedly connected to the liftable sealing valve seat, and the beam plate is detachably connected to the bottom of the valve stem.

[0012] As a further preferred embodiment, a second sealing member is provided at the lower end of the liftable sealing valve seat, and when the liftable sealing valve seat is lowered, the second sealing member contacts and seals with the hemispherical valve disc.

[0013] As further preferred, the drive assembly includes a bracket, a stem nut and a handwheel, the bracket is fixedly connected to the valve cover, the stem nut is rotatably connected to the bracket, the valve stem passes through the bracket and the stem nut and is threadedly connected to the stem nut, the handwheel is arranged on the stem nut, and the handwheel rotates to drive the stem nut to rotate.

[0014] As a further preferred embodiment, the eccentric hemispheric valve also includes a shaft sealing structure, which includes a first sealing ring, a second sealing ring, a third sealing ring and a clamping piece, wherein the first sealing ring is arranged between the valve stem and the bracket, the second sealing ring is arranged between the bracket and the valve cover, the third sealing ring is arranged between the valve stem and the valve cover, and the clamping piece is connected to the bracket by bolts to clamp the first sealing ring.

[0015] As a further preferred embodiment, a spherical crown is fixedly connected to the hemispherical valve disc by means of screws, and an annular groove for installing the first sealing member is formed between the spherical crown and the hemispherical valve disc.

[0016] As a further preference, the valve cover is also provided with a manual pressure relief valve connected to the valve chamber, and the manual pressure relief valve is opened to achieve pressure relief.

[0017] In general, the above technical solutions conceived by this application have at least the following technical advantages compared with the prior art:

[0018] 1. In the present application, when the hemispherical valve disc rotates to be parallel to the flow direction of the medium, the eccentric hemispherical valve is fully opened, and the valve stem is driven down by the driving assembly on the valve cover to drive the liftable sealing valve seat to descend, and the liftable sealing valve seat descends to abut against the hemispherical valve disc for sealing, and a closed cavity is formed between the valve cover and the hemispherical valve disc, and the first sealing member is located in the closed cavity, so that the first sealing member can be replaced when the eccentric hemispherical valve is in the open state;

[0019] 2. This application adopts a rising stem structure, which allows the operator to intuitively see the position of the valve stem after lifting and lowering, and then understand the position of the liftable sealing valve seat, so that the operator can operate accurately and timely;

[0020] 3. By setting a limit screw on the upper valve seat, when the liftable sealing valve seat abuts against the hemispherical valve disc, the limit screw is rotated to position the liftable sealing valve seat, thereby improving the sealing strength between the liftable sealing valve seat and the hemispherical valve disc;

[0021] 4. By setting a manual pressure relief valve on the valve cover, when a closed cavity is formed between the valve cover and the hemispherical valve disc, before opening the valve cover, first open the manual pressure relief valve to reduce the pressure in the closed cavity to achieve pressure balance, making it safer to open the valve cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the eccentric hemispherical valve provided in an embodiment of the present application;

[0023] Figure 2 is a schematic diagram of the top view of the eccentric hemispherical valve provided in an embodiment of the present application;

[0024] Figure 3 yes Figure 2 Schematic diagram of the cross-section structure along line AA;

[0025] Figure 4 yes Figure 2 Schematic diagram of the cross-section structure along line BB.

[0026] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein:

[0027] 1. Valve body; 11. Inlet; 12. Valve cavity; 13. Outlet; 14. Valve port; 2. Hemispherical valve disc; 21. First sealing member; 22. Ball crown; 3. Upper valve seat; 31. Guide rod; 4. Valve cover; 41. Manual pressure relief valve; 5. Valve stem; 6. Drive assembly; 61. Bracket; 62. Stem nut; 63. Handwheel; 7. Liftable sealing valve seat; 71. Perforation; 72. Beam plate; 73. Second sealing member; 8. Sealing ring; 9. Limit screw; 10. Shaft seal structure; 101. First sealing ring; 102. Second sealing ring; 103. Third sealing ring; 104. Pressing member. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0029] The present application discloses an eccentric hemispherical valve. Figure 1-3 An eccentric hemispherical valve comprises a valve body 1 and a hemispherical valve disc 2, wherein the valve body 1 is provided with an inlet 11, a valve cavity 12 and an outlet 13 which are connected to each other, and a valve port 14 which is located above the valve cavity 12 and is connected to the valve cavity 12, the hemispherical valve disc 2 is located in the valve cavity 12 and is rotatably connected to the valve body 1 through a valve shaft, the valve shaft and the hemispherical valve disc 2 are pin-connected, the valve shaft is driven to rotate by a valve actuator, and the hemispherical valve disc 2 rotates with the valve shaft, and the inlet 11 and the outlet 13 can be connected or closed by the rotation of the hemispherical valve disc 2, when the hemispherical valve disc 2 rotates to be perpendicular to the flow direction of the medium, the inlet 11 and the outlet 13 are completely closed, and when the hemispherical valve disc 2 rotates to be parallel to the flow direction of the medium (i.e. Figure 4 ), the inlet 11 and the outlet 13 are fully opened, and the outer side of the hemispherical valve flap 2 is detachably connected to the first sealing member 21, which improves the sealing effect.

[0030] The valve port 14 is fixedly connected with an upper valve seat 3 by bolts, and a sealing ring is arranged between the upper valve seat 3 and the valve body 1 to improve the sealing performance. An opening is arranged at the top of the upper valve seat 3, and a valve cover 4 is detachably connected to the top of the upper valve seat 3 by screws. An integrally formed positioning ring is arranged at the bottom of the valve cover 4, and the positioning ring is adapted to the opening. A sealing ring is also arranged between the positioning ring and the upper valve seat 3 to improve the sealing performance. A through hole is arranged in the middle of the valve cover 4 and a valve stem 5 is penetrated therethrough. A driving component 6 for driving the valve stem 5 to rise and fall is installed on the valve cover 4. The interior is slidably connected with a liftable sealing valve seat 7, which is driven to rise and fall by the valve stem 5. When the hemispherical valve disc 2 rotates to be parallel to the flow direction of the medium, the eccentric hemispherical valve is fully opened, and the liftable sealing valve seat 7 descends to abut and seal against the hemispherical valve disc 2, so that a closed cavity is formed between the valve cover 4 and the hemispherical valve disc 2. At this time, the first sealing component 21 is located in the closed cavity. By opening the valve cover 4, the first sealing component 21 can be disassembled and replaced, and the eccentric hemispherical valve does not require water shut-off operations, so it is more convenient to use.

[0031] To facilitate the disassembly and installation of the first sealing member 21, a spherical crown 22 is fixedly connected to the hemispherical valve disc 2 by screws, and an annular groove for installing the first sealing member 21 is formed between the circumferential side of the spherical crown 22 and the hemispherical valve disc 2. The first sealing member 21 is a sealing ring with an annular structure made of rubber material.

[0032] In this embodiment, a plurality of guide rods 31 are fixedly connected to the interior of the upper valve seat 3. The axial direction of the guide rods 31 is the same as the moving direction of the liftable sealing valve seat 7. The liftable sealing valve seat 7 is provided with a through hole 71 for the guide rods 31 to pass through. The liftable sealing valve seat 7 is guided by the guide rods 31 to make its movement more stable. At the same time, the guide rods 31 can limit the liftable sealing valve seat 7 to prevent it from deflecting. A sealing ring 8 is provided between the liftable sealing valve seat 7 and the upper valve seat 3 to ensure the sealing between the liftable sealing valve seat and the upper valve seat 3 and prevent the medium inside the valve cavity 12 from penetrating into the closed cavity from between the liftable sealing valve seat and the upper valve seat 3.

[0033] A beam plate 72 is fixedly connected to the liftable sealing valve seat 7 by bolts, and the beam plate 72 and the bottom of the valve stem 5 are detachably connected. Specifically, a card slot is opened on the beam plate 72 and extends to both ends. A T-shaped card block is fixedly connected to the bottom of the valve stem 5. The card block and the card slot are snap-fitted together. The sliding card block is detached from the end of the card slot to separate the beam plate 72 from the valve stem 5.

[0034] Reference Figure 3In order to drive the valve stem 5 to rise and fall, the driving assembly 6 includes a bracket 61, a stem nut 62 and a handwheel 63. The bracket 61 is fixedly connected to the valve cover 4 by bolts, and the stem nut 62 is rotatably connected to the bracket 61. The valve stem 5 passes through the bracket 61 and the stem nut 62 and is threadedly connected to the stem nut 62. The handwheel 63 is sleeved on the stem nut 62 and connected with a flat key. The handwheel 63 rotates to drive the stem nut 62 to rotate. A locking nut is threadedly connected to the stem nut 62 to fix the handwheel 63. Since the bottom of the valve stem 5 is connected to the beam plate 72 and cannot rotate, when the stem nut 62 rotates, the valve stem 5 is lifted and lowered, thereby driving the beam plate 72 and the liftable sealing valve seat 7 to rise and fall. At the same time, through the position of the valve stem 5 after lifting and lowering, the operator can understand the position of the liftable sealing valve seat 7 and perform operations.

[0035] Reference Figure 4 The eccentric hemispheric valve also includes a shaft sealing structure 10 to ensure the sealing between the valve stem 5 and the valve cover 4. The shaft sealing structure 10 includes a first sealing ring 101, a second sealing ring 102, a third sealing ring 103 and a pressing piece 104. The first sealing ring 101 is arranged between the valve stem 5 and the bracket 61, the second sealing ring 102 is arranged between the bracket 61 and the valve cover 4, the third sealing ring 103 is arranged between the valve stem 5 and the valve cover 4, and the pressing piece 104 is connected to the bracket 61 by bolts to press the first sealing ring 101.

[0036] A second sealing member 73 is provided at the lower end of the liftable sealing valve seat 7. When the liftable sealing valve seat 7 is lowered, the second sealing member 73 contacts and seals with the hemispherical valve disc 2. The outer end of the second sealing member 73 is a boss, and the boss is limitedly installed in the step-shaped installation cavity of the inner wall of the liftable sealing valve seat 7. A convex rib is provided at the inner end, and the end of the convex rib can achieve abutment and sealing with the hemispherical valve disc 2.

[0037] A pressure ring is arranged in the liftable sealing valve seat 7, which is located above the second sealing member 73 and is used to prevent the second sealing member 73 from escaping from the stepped mounting cavity. The pressure ring is slidably connected to the liftable sealing valve seat 7, and the movement direction of the pressure ring is the same as the movement direction of the liftable sealing valve seat 7. A screw for pushing the pressure ring to abut against the second sealing member 73 is threadedly connected on the liftable sealing valve seat 7, so that the sealing between the second sealing member 73 and the hemispherical valve disc 2 can be adjusted.

[0038] Reference Figure 1 A plurality of limit screws 9 are detachably connected to the upper valve seat 3. The limit screws 9 are used to position the liftable sealing valve seat 7 when the liftable sealing valve seat 7 abuts against the hemispherical valve disc 2. When the liftable sealing valve seat 7 abuts against the hemispherical valve disc 2, the limit screws 9 are rotated to make the bottom abut against the liftable sealing valve seat 7, so as to fix the position of the liftable sealing valve seat 7 and improve the sealing strength between the liftable sealing valve seat 7 and the hemispherical valve disc 2.

[0039] A manual pressure relief valve 41 connected to the valve chamber 12 is also fixedly mounted on the valve cover 4. The manual pressure relief valve 41 is opened to achieve pressure relief. When a closed cavity is formed between the valve cover 4 and the hemispherical valve disc 2, before opening the valve cover 4, the pressure in the closed cavity is reduced by opening the manual pressure relief valve 41 to achieve pressure balance, making it safer to open the valve cover 4.

[0040] The working principle of replacing the first sealing member 21 in this application is as follows:

[0041] a) Use the valve actuator to drive the valve shaft to rotate, so that the hemispherical valve disc 2 rotates to be parallel to the flow direction of the medium, so that the eccentric hemispherical valve is fully opened;

[0042] b) Turn the hand wheel 63 to drive the valve stem 5 and the liftable sealing valve seat 7 to descend until the liftable sealing valve seat 7 abuts against the hemispherical valve disc 2 to seal;

[0043] c) Slightly open the manual pressure relief valve 41 to release the pressure inside the sealed cavity, and then fully open the manual pressure relief valve 41 to check whether the second sealing member 73 and the hemispherical valve disc 2 are in good contact and sealing condition;

[0044] d) Tighten the limit screws 9 in sequence to ensure that the second sealing member 73 and the hemispherical valve disc 2 are in contact and sealed position and do not loosen;

[0045] e) Remove the screws on the valve cover 4 in sequence, turn the hand wheel 63 again to disengage the valve stem 5 from the valve stem nut 62, and then remove the valve cover 4 and the valve stem 5 as a whole;

[0046] f) disassembling the spherical cap 22 and taking out the first sealing member 21, replacing the first sealing member 21 and reinstalling the spherical cap 22;

[0047] g) Install the valve cover 4 and the valve stem 5, close the manual pressure relief valve 41, loosen the limit screw 9, and rotate the hand wheel 63 in the opposite direction to raise the valve stem 5 and the liftable sealing valve seat 7.

[0048] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0049] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An eccentric hemispherical valve, characterized in that: It comprises a valve body (1) and a hemispherical valve disc (2); The valve body (1) is provided with an inlet (11), a valve cavity (12) and an outlet (13) which are connected to each other; the hemispherical valve flap (2) is located in the valve cavity (12) and has a first sealing member (21) detachably connected to its outer side; the hemispherical valve flap (2) is rotated to connect or close the inlet (11) and the outlet (13); The valve body (1) is provided with a valve port (14) which is in communication with the valve cavity (12); an upper valve seat (3) is fixedly connected to the valve port (14); a valve cover (4) is detachably connected to the top of the upper valve seat (3); a valve stem (5) is passed through the valve cover (4); and a driving component (6) for driving the valve stem (5) to rise and fall is provided on the valve cover (4); a liftable sealing valve seat (7) is provided in the upper valve seat (3); the valve stem (5) is lifted and lowered to drive the liftable sealing valve seat (7) to rise and fall; After the eccentric hemispherical valve is fully opened, the liftable sealing valve seat (7) descends to abut against the hemispherical valve disc (2) for sealing, so that a closed cavity is formed between the valve cover (4) and the hemispherical valve disc (2), and the first sealing member (21) is located in the closed cavity.

2. An eccentric hemispherical valve according to claim 1, characterized in that: A plurality of guide rods (31) are fixedly connected to the interior of the upper valve seat (3), wherein the axial direction of the guide rods (31) is the same as the moving direction of the liftable sealing valve seat (7), and the liftable sealing valve seat (7) is provided with through holes (71) for the guide rods (31) to pass through.

3. An eccentric hemispherical valve as claimed in claim 1, characterized in that: A sealing ring (8) is provided between the liftable sealing valve seat (7) and the upper valve seat (3).

4. An eccentric hemispherical valve according to claim 1, characterized in that: The upper valve seat (3) is detachably connected to a plurality of limit screws (9), and the limit screws (9) are used to position the liftable sealing valve seat (7) when the liftable sealing valve seat (7) abuts against the hemispherical valve flap (2).

5. An eccentric hemispherical valve as claimed in claim 1, characterized in that: A beam plate (72) is fixedly connected to the liftable sealing valve seat (7), and the beam plate (72) is detachably connected to the bottom of the valve stem (5).

6. An eccentric hemispherical valve according to claim 1, characterized in that: A second sealing member (73) is provided at the lower end of the liftable sealing valve seat (7); when the liftable sealing valve seat (7) is lowered, the second sealing member (73) contacts and seals with the hemispherical valve flap (2).

7. An eccentric hemispherical valve according to any one of claims 1 to 6, characterized in that: The driving assembly (6) comprises a bracket (61), a valve stem nut (62) and a hand wheel (63); the bracket (61) is fixedly connected to the valve cover (4); the valve stem nut (62) is rotatably connected to the bracket (61); the valve stem (5) passes through the bracket (61) and the valve stem nut (62) and is threadedly connected to the valve stem nut (62); the hand wheel (63) is arranged on the valve stem nut (62); the hand wheel (63) rotates to drive the valve stem nut (62) to rotate.

8. An eccentric hemispherical valve as claimed in claim 7, characterized in that: The eccentric hemispherical valve also includes a shaft sealing structure (10), the shaft sealing structure (10) including a first sealing ring (101), a second sealing ring (102), a third sealing ring (103) and a pressing piece (104), the first sealing ring (101) being arranged between the valve stem (5) and the bracket (61), the second sealing ring (102) being arranged between the bracket (61) and the valve cover (4), the third sealing ring (103) being arranged between the valve stem (5) and the valve cover (4), and the pressing piece (104) being connected to the bracket (61) by bolts to press the first sealing ring (101).

9. An eccentric hemispherical valve according to claim 1, characterized in that: A spherical cap (22) is fixedly connected to the hemispherical valve flap (2) by means of screws, and an annular groove for mounting the first sealing member (21) is formed between the spherical cap (22) and the hemispherical valve flap (2).

10. An eccentric hemispherical valve according to claim 1, characterized in that: The valve cover (4) is also provided with a manual pressure relief valve (41) which is in communication with the valve chamber (12); the manual pressure relief valve (41) is opened to achieve pressure relief.

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