Control pipeline needle valve with low torque and high loading capacity

Abstract

The invention discloses a control pipeline needle valve low in torque and high in loading capacity, and relates to the field of needle valves, the control pipeline needle valve comprises a needle valve body, a flange plate is mounted on the outer wall of the needle valve body, a U-shaped sealing steel ring is mounted in an inner cavity of the flange plate, and lubricating gaskets are mounted on the outer wall of an upper valve rod and the outer wall of a lower valve rod; a mounting base is mounted in the center of the top of the needle valve body, clamping blocks are symmetrically and movably connected to the two sides of the bottom of the mounting base, a base is mounted at the bottom of the needle valve body, and supporting assemblies are symmetrically and rotationally connected to the periphery of the bottom of the base. According to the control pipeline needle valve low in torque and high in pressure bearing capacity, the needle valve body and the conical surface of the U-shaped sealing steel ring are different in angle, so that the principle that linear sealing is achieved is achieved, the original traditional pressing sealing principle is abandoned, the design of the U-shaped sealing steel ring is adopted, and the sealing effect is good. In this way, the sealing effect under high pressure can be guaranteed, and meanwhile the torque can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the field of needle valves, and in particular to a control pipeline needle valve with low torque and high pressure bearing capacity. Background Art

[0002] With the growth of global population and economic development, the demand for oil, gas and mineral resources is increasing. However, the reserves of many important oil, gas and mineral resources on the surface or in shallow layers are limited and can no longer meet the long-term needs of mankind. Therefore, in order to ensure national security and sustainable development, it is necessary to find new sources of resources. The deep earth is a potential treasure trove of important resources. As the depth of oil drilling continues to increase, it is bound to cause the replacement of traditional equipment. New equipment needs to meet the challenges of high temperature resistance, high pressure resistance, high sulfur content and other harsh working conditions brought by new working conditions. The control pipeline needle valve is also an important component of wellhead equipment.

[0003] At present, the highest pressure of traditional control pipeline needle valves can only meet the use of 20,000PSI, and there are no successful application cases of 25,000PSI products in China. The uncertainty brought by 10,000-meter deep wells is far beyond expectations. From a cognitive point of view, as the drilling depth increases, the temperature will rise, and in extreme cases it may reach 180°C. The increase in pressure and the increase in harmful gases such as hydrogen sulfide have put forward higher requirements on the design of traditional control needle valves.

[0004] Therefore, it is necessary to propose a control line needle valve with low torque and high pressure bearing capacity to solve the above problems. Summary of the invention

[0005] The main purpose of the present invention is to provide a control pipeline needle valve with low torque and high pressure bearing capacity, which can effectively solve the problems in the background technology.

[0006] To achieve the above object, the technical solution adopted by the present invention is:

[0007] A control pipeline needle valve with low torque and high pressure bearing capacity, comprising a needle valve body, a flange is installed on the outer wall of the needle valve body, a U-shaped sealing steel ring is installed in the inner cavity of the flange, an upper valve stem and a lower valve stem are installed in the inner cavity of the needle valve body, and lubricating gaskets are installed on the outer walls of the upper valve stem and the lower valve stem;

[0008] A mounting seat is installed in the middle of the top of the needle valve body, and clamping blocks are symmetrically and movably connected on both sides of the bottom of the mounting seat;

[0009] A base is installed at the bottom of the needle valve body, positioning components are symmetrically and movably connected on both sides of the top of the base, limiting components are symmetrically installed around the bottom of the base, and supporting components are symmetrically and rotatably connected around the bottom of the base.

[0010] Preferably, a clamping bolt is installed on the outer wall of the needle valve body, the flange is installed on the outer wall of the needle valve body through the clamping bolt, a handle is installed on the top of the upper valve stem, a connecting cylinder is installed on the top of the inner cavity of the needle valve body, the upper valve stem and the lower valve stem are movably connected in the inner cavity of the connecting cylinder, the lubricating gasket is arranged in the inner cavity of the connecting cylinder, the needle valve body is made of corrosion-resistant alloy that meets the ACE 0175 standard, the upper valve stem and the connecting cylinder are made of 825 alloy, and the U-shaped sealing steel ring is made of PEEK material + special corrosion-resistant metal skeleton material.

[0011] Preferably, the bottom of the handle is threadedly connected in the inner cavity of the mounting seat, and connecting seats are symmetrically and movably connected in the middle of both sides of the mounting seat, and the opposite sides of the two connecting seats are symmetrically installed on the top of the opposite sides of the two blocks.

[0012] Preferably, movable grooves are symmetrically opened on both sides of the bottom of the mounting seat, a fixing rod is fixedly connected in the inner cavity of the movable groove, a spring is wound on the outer wall of the fixing rod, one side of the spring is installed in the inner cavity of the movable groove, and the other side of the spring is installed on the outer wall of the block, and the opposite sides of the tops of the two blocks are symmetrically and movably connected in the inner cavities of the two movable grooves and are sleeved on the outer wall of the fixing rod.

[0013] Preferably, the opposite sides of the two positioning components are symmetrically fitted on both sides of the needle valve body, adjustment grooves are symmetrically opened on both sides of the top of the base, the bottom of the inner cavity of the base is rotatably connected to a bidirectional screw rod, a rotating handle is installed on the right side of the bidirectional screw rod, and the rotating handle is rotatably connected to the right side of the base.

[0014] Preferably, adjustment blocks are symmetrically mounted at the bottom of the two positioning assemblies, and the adjustment blocks are movably connected in the inner cavity of the adjustment groove and are threadedly connected to the outer wall of the bidirectional screw.

[0015] Preferably, a limiting column is movably connected in the inner cavity of the limiting assembly, a pull handle is installed at one end of the limiting column, contraction grooves are symmetrically opened on both ends of the limiting column, a fixing column is installed in the inner cavity of the contraction groove, a contraction spring is wound around the outer wall of the fixing column, and one side of the contraction spring is installed on the side of the inner cavity of the contraction groove.

[0016] Preferably, one side of the inner cavity of the limiting component is symmetrically and movably connected in the inner cavity of the contraction groove at both ends and is sleeved on the outer wall of the fixed column. The other side of the contraction spring is installed on the side of the limiting component, and the top of the limiting column is attached to the bottom of the supporting component.

[0017] Preferably, through grooves are symmetrically provided on both sides of the support assembly, one end of the support assembly is communicated with the outside, a support column is movably connected in the inner cavity of the support assembly, and a limit block is installed at one end of the support column.

[0018] Preferably, the limit block is movably connected in the inner cavity of the support assembly, and the two sides of the limit block are movably connected in the inner cavity of the through grooves on both sides. The other end of the support column is rotatably connected to a mounting plate, and threaded grooves are symmetrically provided on both sides of the mounting plate.

[0019] Compared with the prior art, the present invention provides a control pipeline needle valve with lower torque and higher pressure bearing capacity, which has the following beneficial effects:

[0020] 1. This control pipeline needle valve with low torque and high pressure bearing capacity adopts a full metal sealing design in view of extremely harsh working conditions. A U-shaped sealing steel ring structure is used between the needle valve body and the flange connection. This design forms a line seal to achieve the sealing principle through the different angles of the needle valve body and the U-shaped sealing steel ring cone. It abandons the original traditional compression sealing principle and adopts the U-shaped sealing steel ring design, which can ensure the sealing effect under high pressure and effectively reduce the torque. The needle valve body adopts a two-stage design, which is divided into an upper valve stem and a lower valve stem, which are connected by a connecting tube. The upper valve stem and the lower valve stem directly use lubricating gaskets, which can prevent overload and have a certain lubrication effect to reduce torque.

[0021] 2. This control pipeline needle valve with low torque and high pressure bearing capacity has the effect of resistant to high sulfur conditions because the needle valve body is made of corrosion-resistant alloy that meets the NACE 0175 standard. The upper valve stem and connecting tube are made of 825 alloy. Since 825 alloy is softer, it can form a hardness difference with the needle valve body material, thereby achieving a better sealing effect. The U-shaped sealing steel ring is made of PEEK material + special corrosion-resistant metal skeleton material to achieve a better sealing effect.

[0022] 3. The control pipeline needle valve with low torque and high pressure bearing capacity can drive the block to move by pressing the connecting seats arranged on both sides. At this time, the block can be separated from the inner cavity of the needle valve body, so that the handle, the upper valve stem and the lower valve stem can be taken out from the inner cavity of the needle valve body, which is convenient for maintenance. At the same time, a spring is provided to bounce the block to the side at any time, so that the block can always fit in the inner cavity of the needle valve body, thereby improving the tightness of the connection of the mounting seat.

[0023] 4. The control pipeline needle valve with low torque and high pressure bearing capacity can drive the bidirectional screw to rotate by rotating the set handle, so that the adjustment block can be threadedly connected with it. At this time, the positions of the two positioning components can be adjusted so that the positioning components can fit on both sides of the needle valve body, which can improve the stability of the needle valve body when it is in use.

[0024] 5. The control pipeline needle valve with low torque and high pressure bearing capacity can always bounce the limit column to the side through the set contraction spring, so that the limit column can limit the support assembly. Under normal circumstances, the storage of the support assembly can be limited. When the support assembly needs to be used, the limit column is moved to the other side, and the support assembly can be expanded to support the needle valve body.

[0025] 6. The control pipeline needle valve with low torque and high pressure bearing capacity has a support assembly and a through groove, so that the support column can move up and down in its inner cavity according to the use requirements, so that the position of the mounting plate can be adjusted. When the needle valve body is in use, the mounting plate can be adjusted to a suitable position, and after it is installed, the needle valve body can be supported and reinforced. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 is a cross-sectional view of the needle valve body of the present invention;

[0028] Figure 3 It is a schematic diagram of the structure of the mounting base of the present invention;

[0029] Figure 4 It is a structural schematic diagram of the base of the present invention;

[0030] Figure 5 It is a structural schematic diagram of the limiting column of the present invention;

[0031] Figure 6 It is a structural schematic diagram of the support assembly of the present invention.

[0032] In the figure: 1. needle valve body; 2. clamping bolt; 3. U-shaped sealing steel ring; 4. handle; 5. flange; 6. mounting seat; 7. upper valve stem; 8. connecting tube; 9. lubricating gasket; 10. lower valve stem; 11. connecting seat; 12. clamping block; 13. movable groove; 14. fixing rod; 15. spring; 16. base; 17. turning handle; 18. adjusting groove; 19. positioning assembly; 20. adjusting block; 21. two-way screw rod; 22. limiting assembly; 23. pull handle; 24. limiting column; 25. contraction groove; 26. fixing column; 27. contraction spring; 28. support assembly; 29. ​​through groove; 30. support column; 31. limiting block; 32. positioning bolt; 33. mounting plate. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0034] Embodiment 1:

[0035] like Figure 1-Figure 2 As shown, a control pipeline needle valve with low torque and high pressure bearing capacity comprises a needle valve body 1, a flange 5 is installed on the outer wall of the needle valve body 1, a U-shaped sealing steel ring 3 is installed in the inner cavity of the flange 5, an upper valve stem 7 and a lower valve stem 10 are installed in the inner cavity of the needle valve body 1, a lubricating gasket 9 is installed on the outer wall of the upper valve stem 7 and the lower valve stem 10, a clamping bolt 2 is installed on the outer wall of the needle valve body 1, the flange 5 is installed on the outer wall of the needle valve body 1 through the clamping bolt 2, a handle 4 is installed on the top of the upper valve stem 7, a connecting cylinder 8 is installed on the top of the inner cavity of the needle valve body 1, the upper valve stem 7 and the lower valve stem 10 are movably connected in the inner cavity of the connecting cylinder 8, the lubricating gasket 9 is arranged in the inner cavity of the connecting cylinder 8, the needle valve body 1 is made of corrosion-resistant alloy that meets the NACE 0175 standard, the upper valve stem 7 and the connecting cylinder 8 are made of 825 alloy, and the U-shaped sealing steel ring 3 is made of PEEK material + special corrosion-resistant metal skeleton material;

[0036] In view of the extremely harsh working conditions, the full metal sealing design is adopted, and the structure of the U-shaped sealing steel ring 3 is adopted between the needle valve body 1 and the flange 5. This design forms a line seal to achieve the sealing principle through the different angles of the cone surfaces of the needle valve body 1 and the U-shaped sealing steel ring 3, abandoning the original traditional compression sealing principle and adopting the design of the U-shaped sealing steel ring 3, which can ensure the sealing effect under high pressure and effectively reduce the torque. The needle valve body 1 adopts a two-stage design, which is divided into an upper valve stem 7 and a lower valve stem 10, which are connected by a connecting tube 8. The upper valve stem 7 and the lower valve stem 10 directly adopt a lubricating gasket 9, which can achieve the function of preventing overload and have a certain lubrication effect and reduce the torque. Since the needle valve body 1 adopts a NACE-compliant The 0175 standard corrosion-resistant alloy makes it resistant to high sulfur conditions. The upper valve stem 7 and the connecting tube 8 are made of 825 alloy. Since 825 alloy is softer, it can form a hardness difference with the needle valve body 1 material, thereby achieving a better sealing effect. The U-shaped sealing steel ring 3 is made of PEEK material + special corrosion-resistant metal skeleton material to achieve a better sealing effect.

[0037] Embodiment 2:

[0038] like Figure 1 , Figure 3As shown, a control pipeline needle valve with low torque and high pressure bearing capacity is provided, wherein a mounting seat 6 is installed in the center of the top of the needle valve body 1, and blocks 12 are symmetrically and movably connected on both sides of the bottom of the mounting seat 6, and the bottom of the handle 4 is threadedly connected in the inner cavity of the mounting seat 6, and connecting seats 11 are symmetrically and movably connected in the center of both sides of the mounting seat 6, and the opposite sides of the two connecting seats 11 are symmetrically installed on the tops of the opposite sides of the two blocks 12, and movable grooves 13 are symmetrically opened on both sides of the bottom of the mounting seat 6, and a fixing rod 14 is fixedly connected in the inner cavity of the movable groove 13, and a spring 15 is wound around the outer wall of the fixing rod 14, and one side of the spring 15 is installed in the inner cavity of the movable groove 13, and the other side of the spring 15 is installed on the outer wall of the block 12, and the opposite sides of the tops of the two blocks 12 are symmetrically and movably connected in the inner cavities of the two movable grooves 13 and sleeved on the outer wall of the fixing rod 14;

[0039] By pressing the connecting seats 11 arranged on both sides, the block 12 can be driven to move. At this time, the block 12 can be separated from the inner cavity of the needle valve body 1, so that the handle 4, the upper valve stem 7 and the lower valve stem 10 can be taken out from the inner cavity of the needle valve body 1, which is convenient for maintenance. At the same time, the spring 15 is provided, which can always bounce the block 12 to the side, so that the block 12 can always fit in the inner cavity of the needle valve body 1, thereby improving the tightness of the connection of the mounting seat 6.

[0040] Embodiment three:

[0041] like Figure 1 , Figure 4 , Figure 5 , Figure 6As shown, a control pipeline needle valve with low torque and high pressure bearing capacity is provided. A base 16 is installed at the bottom of the needle valve body 1. Positioning components 19 are symmetrically and movably connected on both sides of the top of the base 16. Limiting components 22 are symmetrically installed around the bottom of the base 16. Supporting components 28 are symmetrically and rotatably connected around the bottom of the base 16. The two opposite sides of the two positioning components 19 are symmetrically fitted on both sides of the needle valve body 1. Adjusting grooves 18 are symmetrically opened on both sides of the top of the base 16. A two-way screw rod 21 is rotatably connected to the bottom of the inner cavity of the base 16. A rotating handle 17 is installed on the right side of the two-way screw rod 21. The rotating handle 17 is rotatably connected to the right side of the base 16. Adjusting blocks 20 are symmetrically installed at the bottom of the two positioning components 19. The adjusting blocks 20 are movably connected in the inner cavity of the adjusting groove 18 and are threadedly connected to the outer wall of the two-way screw rod 21. A limiting column 24 is movably connected in the inner cavity of the limiting component 22. A pull handle 23 is installed at one end of the limiting column 24. The symptoms at both ends of the limiting column 24 A contraction groove 25 is symmetrically provided, a fixing column 26 is installed in the inner cavity of the contraction groove 25, a contraction spring 27 is wound around the outer wall of the fixing column 26, one side of the contraction spring 27 is installed on the side of the inner cavity of the contraction groove 25, one side of the inner cavity of the limit component 22 is symmetrically movably connected in the inner cavity of the contraction groove 25 at both ends and sleeved on the outer wall of the fixing column 26, the other side of the contraction spring 27 is installed on the side of the limit component 22, the top of the limit column 24 is attached to the bottom of the support component 28, through grooves 29 are symmetrically provided on both sides of the support component 28, one end of the support component 28 is communicated with the outside, a support column 30 is movably connected in the inner cavity of the support component 28, a limiting block 31 is installed at one end of the support column 30, the limiting block 31 is movably connected in the inner cavity of the support component 28, both sides of the limiting block 31 are movably connected in the inner cavity of the through grooves 29 on both sides, the other end of the support column 30 is rotatably connected with a mounting plate 33, and threaded grooves are symmetrically provided on both sides of the mounting plate 33;

[0042] By rotating the rotating handle 17, the bidirectional screw rod 21 can be driven to rotate so that the adjusting block 20 can be threadedly connected thereto. At this time, the positions of the two positioning components 19 can be adjusted so that the positioning components 19 can fit on both sides of the needle valve body 1. When the needle valve body 1 is in use, its stability can be improved. By means of the provided contraction spring 27, the limiting column 24 can be bounced to the side at any time so that the limiting column 24 can limit the support component 28. In normal state, the storage of the support component 28 can be limited. When the support component 28 needs to be used, the limiting column 24 is moved to the other side so that the support component 28 can be expanded to support the needle valve body 1. By means of the provided support component 28 and the through groove 29, the support column 30 can be moved up and down in its inner cavity according to the use requirements, so that the position of the mounting plate 33 can be adjusted. When the needle valve body 1 is in use, the mounting plate 33 can be adjusted to a suitable position. After it is installed, the needle valve body 1 can be supported and reinforced.

[0043] It should be noted that the present invention is a control pipeline needle valve with low torque and high pressure bearing capacity. When in use, the needle valve body 1 is closed by the handle 4, the U-shaped sealing steel ring 3 is cleaned to ensure that there is no foreign matter and impurities in the U-shaped sealing steel ring 3, the U-shaped sealing steel ring 3 is greased and installed on the needle valve body 1, the needle valve body 1 is slowly lowered to ensure that it is placed horizontally to prevent the U-shaped sealing steel ring 3 from being pressurized on one side, the clamping bolt 2 on the needle valve body 1 is tightened according to the specified torque, and a pressure test is performed through the pressure test port on the upper part of the needle valve body 1. The test pressure is 1.5 times the rated working pressure, that is, 37500PSI (260Mpa). If there is no pressure drop and obvious bubbles are visible within 15 minutes, the pressure test is qualified. After the pressure test is qualified, the pressure is released to complete the installation.

[0044] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A control line needle valve with low torque and high pressure bearing capacity, comprising a needle valve body (1), characterized in that: A flange (5) is installed on the outer wall of the needle valve body (1), a U-shaped sealing steel ring (3) is installed in the inner cavity of the flange (5), an upper valve stem (7) and a lower valve stem (10) are installed in the inner cavity of the needle valve body (1), and lubricating gaskets (9) are installed on the outer walls of the upper valve stem (7) and the lower valve stem (10); A mounting seat (6) is installed in the middle of the top of the needle valve body (1), and clamping blocks (12) are symmetrically and movably connected on both sides of the bottom of the mounting seat (6); A base (16) is installed at the bottom of the needle valve body (1), and positioning components (19) are symmetrically and movably connected on both sides of the top of the base (16), and limiting components (22) are symmetrically installed around the bottom of the base (16), and supporting components (28) are symmetrically and rotatably connected around the bottom of the base (16).

2. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: The outer wall of the needle valve body (1) is installed with a clamping bolt (2), the flange (5) is installed on the outer wall of the needle valve body (1) through the clamping bolt (2), the top of the upper valve stem (7) is installed with a handle (4), the top of the inner cavity of the needle valve body (1) is installed with a connecting tube (8), the upper valve stem (7) and the lower valve stem (10) are movably connected in the inner cavity of the connecting tube (8), the lubricating gasket (9) is arranged in the inner cavity of the connecting tube (8), the needle valve body (1) is made of a corrosion-resistant alloy that complies with the NACE 0175 standard, the upper valve stem (7) and the connecting tube (8) are made of 825 alloy, and the U-shaped sealing steel ring (3) is made of PEEK material + special corrosion-resistant metal skeleton material.

3. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: The bottom of the handle (4) is threadedly connected in the inner cavity of the mounting seat (6), and a connecting seat (11) is symmetrically and movably connected in the middle of both sides of the mounting seat (6), and the opposite sides of the two connecting seats (11) are symmetrically installed on the top of the opposite sides of the two clamping blocks (12).

4. A control line needle valve with low torque and high pressure bearing capacity according to claim 3, characterized in that: Active grooves (13) are symmetrically provided on both sides of the bottom of the mounting seat (6); a fixing rod (14) is fixedly connected in the inner cavity of the active groove (13); a spring (15) is wound around the outer wall of the fixing rod (14); one side of the spring (15) is installed in the inner cavity of the active groove (13); the other side of the spring (15) is installed on the outer wall of the clamping block (12); and one side opposite to the top of the two clamping blocks (12) is symmetrically and movably connected in the inner cavities of the two active grooves (13) and sleeved on the outer wall of the fixing rod (14).

5. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: The two opposite sides of the two positioning components (19) are symmetrically fitted on the two sides of the needle valve body (1), and the two sides of the top of the base (16) are symmetrically provided with adjustment grooves (18). The bottom of the inner cavity of the base (16) is rotatably connected to a bidirectional screw rod (21), and a rotating handle (17) is installed on the right side of the bidirectional screw rod (21), and the rotating handle (17) is rotatably connected to the right side of the base (16).

6. A control line needle valve with low torque and high pressure bearing capacity according to claim 5, characterized in that: Adjustment blocks (20) are symmetrically mounted at the bottom of the two positioning assemblies (19). The adjustment blocks (20) are movably connected in the inner cavity of the adjustment groove (18) and are threadedly connected to the outer wall of the bidirectional screw rod (21).

7. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: A limiting column (24) is movably connected in the inner cavity of the limiting component (22), a pull handle (23) is installed at one end of the limiting column (24), and contraction grooves (25) are symmetrically opened at both ends of the limiting column (24), a fixing column (26) is installed in the inner cavity of the contraction groove (25), and a contraction spring (27) is wound around the outer wall of the fixing column (26), and one side of the contraction spring (27) is installed on the side of the inner cavity of the contraction groove (25).

8. A control line needle valve with low torque and high pressure bearing capacity according to claim 7, characterized in that: One side of the inner cavity of the limiting component (22) opposite to the other side is symmetrically and movably connected to the inner cavity of the contraction groove (25) at both ends and is sleeved on the outer wall of the fixed column (26); the other side of the contraction spring (27) is installed on the side of the limiting component (22); and the top of the limiting column (24) is attached to the bottom of the supporting component (28).

9. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: Through grooves (29) are symmetrically provided on both sides of the support component (28); one end of the support component (28) is in communication with the outside; a support column (30) is movably connected in the inner cavity of the support component (28); a limit block (31) is installed at one end of the support column (30).

10. A control line needle valve with low torque and high pressure bearing capacity according to claim 1, characterized in that: The limit block (31) is movably connected in the inner cavity of the support assembly (28), and the two sides of the limit block (31) are movably connected in the inner cavities of the through grooves (29) on both sides. The other end of the support column (30) is rotatably connected to a mounting plate (33), and the two sides of the mounting plate (33) are symmetrically provided with thread grooves.

Images