Ball valve

Abstract

The ball valve comprises a valve body, a valve cover, a valve rod and a ball body, the valve cover is installed at the upper end of the valve body, the valve rod penetrates through the valve cover and extends into the valve body, the ball body is arranged in the valve body and is in linkage connection with the inner end of the valve rod, two installation grooves are symmetrically formed in the positions, corresponding to the two sides of the ball body, in the valve body, and valve seats are installed on the installation grooves; the valve seat comprises an inner ring, an outer ring, a first isolation ring, a second isolation ring and a valve seat sealing ring, the inner ring and the outer ring are concentrically arranged, and the first isolation ring and the second isolation ring are welded between the inner ring and the outer ring, so that a hollow inner cavity is defined by the inner ring, the outer ring, the first isolation ring and the second isolation ring; the end of the inner ring and the end of the outer ring protrude out of the second isolation ring to form a sealing groove, and the valve seat sealing ring is embedded in the sealing groove and tightly attached to the surface of the ball. The valve seat adopts a spliced hollow structure, and has the advantages of low processing difficulty, lower material cost and lighter overall weight.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a ball valve with lower cost. Background Technology

[0002] Ball valves are widely used in fluid control. In fluid control applications, ball valves in pipelines are mainly used to open, close, distribute the flow of fluid media, and change the flow direction and velocity of fluid media.

[0003] Currently, ball valves on the market generally consist of a valve body, valve cover, valve stem, and ball. The valve cover is installed on the upper part of the valve body, and the valve stem passes through the valve cover and extends into the valve body to be linked with the ball. Inside the valve body is a valve seat that forms a sealing fit with the ball when the valve is closed. Existing ball valves all use solid, one-piece valve seats, either cast or forged. For large ball valves, one-piece valve seats have disadvantages such as high processing difficulty, high material cost, and large overall weight. Therefore, it is essential to improve existing valve seats to solve these problems. Utility Model Content

[0004] The purpose of this utility model is to provide a ball valve. The valve seat of this utility model adopts a spliced ​​hollow structure, which has the advantages of easy processing, lower material cost and lighter overall weight.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A ball valve, comprising a valve body, a valve cover, a valve stem, and a ball. The valve cover is installed on the upper end of the valve body, the valve stem passes through the valve cover and extends into the interior of the valve body, and the ball is disposed inside the valve body and is linked to the inner end of the valve stem. Two mounting grooves are symmetrically arranged inside the valve body corresponding to both sides of the ball. A valve seat for forming a sealing fit with the ball when the valve is closed is installed on the mounting groove. The valve seat comprises an inner ring, an outer ring, a first isolation ring, a second isolation ring, and a valve seat sealing ring. The inner ring and the outer ring are concentrically arranged. The first isolation ring and the second isolation ring are welded between the inner ring and the outer ring, so that the inner ring, the outer ring, the first isolation ring, and the second isolation ring surround and form a hollow inner cavity. The ends of the inner ring and the outer ring protrude from the second isolation ring to form a sealing groove. The valve seat sealing ring is embedded in the sealing groove and is tightly fitted to the surface of the ball.

[0006] By adopting the above technical solution, the valve seat adopts a spliced ​​hollow structure. The valve seat is welded together by an inner ring, an outer ring, a first isolation ring, and a second isolation ring, and then a detachable and replaceable valve seat sealing ring is embedded. It has the advantages of low processing difficulty, lower material cost, and lighter overall weight. It also reduces production costs and is more conducive to transportation and handling.

[0007] The present invention is further provided that the outer ring has an inwardly recessed annular recess, and an O-ring is embedded in the annular recess for forming a sealing fit with the inner wall of the mounting groove.

[0008] By adopting the above technical solution, the sealing between the valve seat and the mounting groove can be guaranteed, preventing upstream medium from leaking to downstream through the gap between the two when the valve is closed.

[0009] The present invention is further provided that at least one voltage stabilizing hole communicating with the inner cavity is provided through the inner ring.

[0010] By adopting the above technical solution, the inner cavity is connected to the outside, which can avoid the influence of thermal expansion and contraction on the inner cavity of the valve seat, thereby making the connection structure of each component of the valve seat more stable and reliable.

[0011] The present invention is further provided that a pressure ring for pressing the valve seat sealing ring into the sealing groove is welded to the inner circular surface of the outer ring near the end.

[0012] By adopting the above technical solution, the stability of the valve seat sealing ring installation can be guaranteed.

[0013] The present invention is further provided that the inner edge of the pressure ring is provided with an annular bend that bends toward the sealing groove.

[0014] By adopting the above technical solution, the annular bending tightly engages the valve seat seal ring, which can further improve the stability of the valve seat seal ring installation, thereby improving the reliability of the sealing performance.

[0015] The present invention is further provided that at least one disassembly process hole communicating with the sealing groove is provided through the outer ring.

[0016] By adopting the above technical solution, when it is necessary to disassemble the valve seat seal ring in the later stage, it is only necessary to insert the tool into the disassembly process hole and push the valve seat seal ring out of the installation groove, which greatly facilitates the disassembly operation.

[0017] The present invention is further configured such that a plurality of spring grooves are provided on the end face of the mounting groove, and a pre-tightening spring is embedded in the spring groove. The outer end of the pre-tightening spring abuts against the valve seat, causing the valve seat to have a tendency to move toward the ball.

[0018] By adopting the above technical solution, a floating valve seat is formed by applying a preload force towards the ball to the valve seat. Even if the sealing surface of the valve seat sealing ring is worn, the valve seat sealing ring can still press against the surface of the ball, thereby ensuring good sealing performance when the valve is closed.

[0019] The present invention is further configured such that the valve body includes a middle body and a left body and a right body respectively connected to the two ends of the middle body by bolts, and a positioning protrusion is provided at the upper and lower ends of the ball, and a positioning ring is sleeved on the outer periphery of the positioning protrusion. The left and right sides of the positioning ring are respectively connected to the left body and the right body by cylindrical pins.

[0020] By adopting the above technical solution, the detachable structure of the valve body facilitates the disassembly and assembly of the overall components, and also makes transportation and handling easier.

[0021] The present invention is further configured such that a drain screw hole is provided through the bottom of the valve body, and a drain plug is threaded to the outer end of the drain screw hole.

[0022] By adopting the above technical solution, when the valve is idle, the drain plug can be opened to drain the residual liquid inside the valve, and the drain plug can also be opened when cleaning the valve to drain the wastewater after cleaning. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0024] Figure 2 for Figure 1 Enlarged structural diagram of section A in the middle;

[0025] Figure 3 This is a schematic diagram of the valve seat structure of this utility model without the valve seat sealing ring;

[0026] Figure 4 This is an exploded view of the valve seat structure without the valve seat sealing ring of this utility model.

[0027] In the diagram: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Ball; 5. Mounting groove; 6. Valve seat; 7. Inner ring; 8. Outer ring; 9. First isolation ring; 10. Second isolation ring; 11. Valve seat sealing ring; 12. Inner cavity; 13. Sealing groove; 14. Annular recess; 15. O-ring; 16. Pressure stabilizing hole; 17. Pressure ring; 18. Annular bend; 19. Disassembly process hole; 20. Spring groove; 21. Preload spring; 22. Middle body; 23. Left body; 24. Right body; 25. Positioning protrusion; 26. Positioning ring; 27. Cylindrical pin; 28. Drain screw hole; 29. ​​Drain screw plug. Detailed Implementation

[0028] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0029] Example: As attached Figures 1 to 4 The ball valve shown includes a valve body 1, a valve cover 2, a valve stem 3, and a ball 4. The valve cover 2 is installed on the upper end of the valve body 1. The valve stem 3 passes through the valve cover 2 and extends into the valve body 1. The ball 4 is disposed inside the valve body 1 and is linked to the inner end of the valve stem 3. Two mounting grooves 5 are symmetrically arranged inside the valve body 1 corresponding to the two sides of the ball 4. A valve seat 6 is installed on the mounting groove 5 for forming a sealing fit with the ball 4 when the valve is closed. The valve seat 6 includes an inner ring 7, an outer ring 8, a first isolation ring 9, and a second isolation ring 1. The valve seat 6 comprises a valve seat sealing ring 11 and a valve seat sealing ring 11. The inner ring 7 and the outer ring 8 are concentrically arranged. The first isolation ring 9 and the second isolation ring 10 are welded between the inner ring 7 and the outer ring 8, so that the inner ring 7, the outer ring 8, the first isolation ring 9, and the second isolation ring 10 surround and form a hollow inner cavity 12. The ends of the inner ring 7 and the outer ring 8 protrude from the second isolation ring 10 to form a sealing groove 13. The axial length of the outer ring 8 is greater than that of the inner ring 7. The valve seat sealing ring 11 is embedded in the sealing groove 13 and fits tightly against the surface of the ball 4. The valve seat 6 adopts a spliced ​​hollow structure. The valve seat 6 is welded from the inner ring 7, the outer ring 8, the first isolation ring 9, and the second isolation ring 10, and then a detachable and replaceable valve seat sealing ring 11 is embedded in it. It has the advantages of low processing difficulty, lower material cost, and lighter overall weight, which reduces production costs and is also more conducive to transportation and handling.

[0030] The inner ring 7 and outer ring 8 are first cut into rectangular steel plates of the corresponding size using a laser cutting machine, then the steel plates are rolled into a ring shape, and finally welded together end to end; the first isolation ring 9 and the second isolation ring 10 are made by directly cutting steel plates using a laser cutting machine; the valve seat sealing ring 11 is made of PTFE material.

[0031] As attached Figure 2 and attached Figure 3 As shown, the outer ring 8 has an inwardly recessed annular recess 14, which is formed by stamping. An O-ring 15 is embedded in the annular recess 14 to form a sealing fit with the inner wall of the mounting groove 5. This design ensures the sealing between the valve seat 6 and the mounting groove 5, preventing upstream medium from leaking downstream through the gap between them when the valve is closed.

[0032] As attached Figure 1 and attachedFigure 3 As shown, at least one pressure-stabilizing hole 16 communicating with the inner cavity 12 is provided through the inner ring 7. In this embodiment, there are two pressure-stabilizing holes 16. The inner cavity 12 is connected to the outside, which can avoid the inner cavity 12 of the valve seat 6 from being affected by thermal expansion and contraction, thereby making the connection structure of each component of the valve seat 6 more stable and reliable.

[0033] As attached Figure 2 As shown, a pressure ring 17 is welded to the inner surface of the outer ring 8 near the end to press the valve seat sealing ring 11 into the sealing groove 13. The pressure ring 17 is cut using a laser cutting machine. This design ensures the stability of the valve seat sealing ring 11 during installation.

[0034] As attached Figure 2 As shown, the inner edge of the pressure ring 17 is provided with an annular bend 18 that curves towards the sealing groove 13. The annular bend 18 tightly engages the valve seat sealing ring 11, which can further improve the stability of the valve seat sealing ring 11 installation, thereby improving the reliability of the sealing performance.

[0035] As attached Figure 2 and attached Figure 3 As shown, at least one disassembly process hole 19 communicating with the sealing groove 13 is provided through the outer ring 8. When it is necessary to disassemble the valve seat sealing ring 11 later, simply insert a tool into the disassembly process hole 19 to push the valve seat sealing ring 11 out of the mounting groove 5, which greatly facilitates the disassembly operation.

[0036] As attached Figure 2 As shown, the mounting groove 5 has multiple spring grooves 20 on its end face, and a preload spring 21 is embedded in each spring groove 20. The outer end of the preload spring 21 abuts against the valve seat 6, causing the valve seat 6 to tend to move towards the ball 4. By applying a preload force to the valve seat 6 towards the ball 4, a floating valve seat 6 is formed. Even if the sealing surface of the valve seat sealing ring 11 is worn, the valve seat sealing ring 11 can still abut against the surface of the ball 4, thereby ensuring good sealing performance when the valve is closed.

[0037] As attached Figure 1 As shown, the valve body 1 includes a middle body 22 and a left body 23 and a right body 24 connected to both ends of the middle body 22 by bolts. The ball 4 has a positioning protrusion 25 at each of its upper and lower ends. A positioning ring 26 is fitted around the outer periphery of each positioning protrusion 25. The left and right sides of the positioning ring 26 are connected to the left body 23 and the right body 24 by cylindrical pins 27. The detachable structure of the valve body 1 facilitates the disassembly and assembly of the entire component, and also facilitates transportation and handling.

[0038] As attached Figure 1As shown, a drain screw hole 28 is provided through the bottom of the valve body 1, and a drain plug 29 is threaded to the outer end of the drain screw hole 28. When the valve is idle, the drain plug 29 can be opened to drain the residual liquid inside the valve, and the drain plug 29 can also be opened when cleaning the valve to drain the wastewater after cleaning.

Claims

1. A ball valve comprising a valve body (1), a valve cover (2), a valve stem (3) and a ball (4), the valve cover (2) being mounted on the upper end of the valve body (1), the valve stem (3) penetrating through the valve cover (2) and extending into the interior of the valve body (1), the ball (4) being arranged in the interior of the valve body (1) and being connected with the inner end of the valve stem (3) in linkage, two installation grooves (5) being symmetrically arranged in the valve body (1) at positions corresponding to the two sides of the ball (4), and a valve seat (6) for sealingly cooperating with the ball (4) when the valve is closed being mounted on the installation groove (5); characterized in that: The valve seat (6) comprises an inner ring (7), an outer ring (8), a first isolation ring (9), a second isolation ring (10) and a valve seat sealing ring (11), the inner ring (7) and the outer ring (8) are concentrically arranged, the first isolation ring (9) and the second isolation ring (10) are welded between the inner ring (7) and the outer ring (8), so that the inner ring (7), the outer ring (8), the first isolation ring (9) and the second isolation ring (10) form a hollow inner cavity (12), and the end of the inner ring (7) and the outer ring (8) protrudes from the second isolation ring (10) to form a sealing groove (13), the valve seat sealing ring (11) is embedded in the sealing groove (13) and tightly fits the surface of the ball (4).

2. A ball valve according to claim 1, characterised in that: The outer ring (8) is provided with an annular recess (14) recessed inwardly, and the annular recess (14) is embedded with an O-ring (15) for sealing cooperation with the inner wall of the mounting groove (5).

3. A ball valve according to claim 1, wherein: The inner ring (7) is provided with at least one pressure stabilizing hole (16) communicating with the inner cavity (12).

4. A ball valve according to claim 1, characterized in that: The inner circular surface of the outer ring (8) is welded with a pressing ring (17) near the end portion for pressing the valve seat sealing ring (11) in the sealing groove (13).

5. A ball valve according to claim 4, characterised in that: The inner edge of the pressing ring (17) is provided with an annular bending (18) bent towards the sealing groove (13).

6. A ball valve according to claim 5, characterised in that: The outer ring (8) is provided with at least one disassembly process hole (19) communicating with the sealing groove (13).

7. A ball valve according to claim 1, characterized in that: The end face of the mounting groove (5) is provided with a plurality of spring grooves (20), the spring grooves (20) are embedded with pre-tightening springs (21), the outer end of the pre-tightening spring (21) abuts against the valve seat (6), so as to make the valve seat (6) have a tendency to move towards the ball (4).

8. A ball valve according to claim 1, characterized in that: The valve body (1) comprises a middle body (22) and left and right bodies (23) and (24) connected to both ends of the middle body (22) by bolts, the ball (4) is provided with a positioning convex portion (25) at each end, the outer periphery of the positioning convex portion (25) is sleeved with a positioning ring (26), and the left and right sides of the positioning ring (26) are connected with the left and right bodies (23) and (24) by cylindrical pins (27).

9. A ball valve according to claim 1, characterized in that: The bottom of the valve body (1) is provided with a blowdown screw hole (28) in a through manner, and the outer end of the blowdown screw hole (28) is threadedly connected with a blowdown screw plug (29).

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