Bidirectional torque double-isolation release ball valve and assembling method thereof

Abstract

The invention discloses a bidirectional torque double-isolation release ball valve and an assembling method thereof, the ball valve comprises a valve body and two ball valve assemblies, and a fluid channel is arranged in the valve body; each ball valve assembly comprises a ball valve element, an adjusting nut, a valve seat and a gland, the ball valve element is arranged in the valve body, an overflowing through hole is formed in the ball valve element, a first seat body and a second seat body of the valve seat are arranged on the two opposite sides of the ball valve element, the first seat body is connected with the edge of one end of the overflowing through hole, and the second seat body is connected with the edge of the other end of the overflowing through hole. The adjusting nut is arranged in the middle of the fluid channel in a screwed mode, the position of the adjusting nut can be axially adjusted relative to the fluid channel, the interior of the gland is through, the gland is arranged at the end of the fluid channel in a screwed mode, the position of the gland can be axially adjusted relative to the fluid channel, the adjusting nut can push the first seat body, and meanwhile the gland can form back pressure on the second seat body. According to the ball valve, reverse jacking force and return pressure can be applied to the ball valve element, and radial limiting of the ball valve element is achieved.

Description

Technical Field

[0001] This invention relates to the field of valve equipment technology, and in particular to a bidirectional torque double isolation relief ball valve and its assembly method. Background Technology

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, regulate and control the parameters of the conveyed medium. They have functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion or overflow pressure relief. Valves used in fluid control systems range from the simplest shut-off valves to various valves used in extremely complex automatic control systems, and their varieties and specifications are quite numerous; the double isolation relief ball valve is one of the many types of valves.

[0003] Dual-isolation relief ball valves are widely used in pipelines of fluid control systems in various industries such as power, petrochemical, metallurgy, marine, natural gas, and pharmaceuticals to meet the isolation requirements of critical areas. Although existing dual-isolation relief ball valves have achieved structural integration to a certain extent and reduced leakage points, they still have the following defects: they can only apply unidirectional installation torque to the ball valve, which can easily lead to uneven force on the valve core and cause eccentricity. When the valve core is twisted, it is easy to wear the valve core and affect the sealing effect. Therefore, existing dual-isolation relief ball valves are difficult to achieve long-term reliable isolation and relief control in critical isolation applications. Summary of the Invention

[0004] This invention provides a bidirectional torque dual isolation and relief ball valve and its assembly method. This ball valve can apply reverse thrust and back pressure to the ball valve core to limit the position of the ball valve core, so as to prevent the ball valve core from being eccentric and to avoid damage to the ball valve core when twisting it. This enables the ball valve to achieve long-term reliable isolation and relief control in critical isolation applications. The assembly method is based on the above-mentioned ball valve and can optimize the assembly process of the ball valve, making it easier to assemble and maintain the ball valve.

[0005] The present invention provides a bidirectional torque dual isolation relief ball valve in the first aspect, comprising a valve body and two sets of ball valve assemblies. The valve body is provided with a fluid channel, and the two sets of ball valve assemblies are disposed on the valve body and respectively connected to the two ends of the fluid channel. The two sets of ball valve assemblies are used for opening and closing control of the fluid channel.

[0006] Each ball valve assembly includes a ball valve core, an adjusting nut, a valve seat, and a gland;

[0007] The ball valve core is disposed inside the valve body, and the ball valve core is provided with a flow passage. The ball valve core can rotate relative to the valve body to adjust its position so that the flow passage and the fluid channel are connected or not connected.

[0008] The valve seat has a first seat body and a second seat body, which are disposed on opposite sides of the ball valve core. The first seat body is connected to the edge of one end of the flow passage, and the second seat body is connected to the edge of the other end of the flow passage.

[0009] The adjusting nut is screwed into the middle of the fluid channel and its position can be adjusted relative to the axial direction of the fluid channel;

[0010] The gland has a through-hole and is screwed onto the end of the fluid channel, and its position can be adjusted axially relative to the fluid channel.

[0011] The adjusting nut pushes the first seat, causing it to move away from the center of the fluid channel. Meanwhile, the gland pushes the second seat, causing it to move closer to the center of the fluid channel, thus achieving radial limiting of the ball valve core.

[0012] In some embodiments, a support ring is provided on the side of the adjusting nut facing the first seat, the support ring abuts against the side edge of the first seat, and a first sealing assembly is provided on the outer periphery of the support ring, the first sealing assembly being sealed to the inner side of the fluid channel;

[0013] A second sealing assembly is provided on the outer periphery of the end of the gland that extends into the fluid channel, and the second sealing assembly is sealed to the inner side of the fluid channel.

[0014] In some embodiments, each ball valve assembly further includes a first retaining ring and a second retaining ring, the first retaining ring being fitted around the outer periphery of the first seat and the second retaining ring being fitted around the outer periphery of the second seat.

[0015] In some embodiments, the end of the support ring is provided with a first annular groove, the first seat is sleeved on the first annular groove, and the side of the first side of the first seat and the side of the first side of the first guard ring abut against the side of the first annular groove.

[0016] The end of the pressure cap is provided with a second annular groove, the second seat is fitted onto the second annular groove, and the side of the first side of the second seat and the side of the first side of the second protective ring abut against the side of the second annular groove.

[0017] In some embodiments, a first receiving groove is provided at the outer edge of the first side of the first seat, and a first inner ring portion is formed on the first side of the first protective ring, the first inner ring portion being connected to the first receiving groove.

[0018] A second receiving groove is provided at the outer edge of the first side of the second seat, and a second inner ring is formed on the first side of the second protective ring, the second inner ring being connected to the second receiving groove.

[0019] In some embodiments, the ball valve core is provided with a first annular limiting groove and a second annular limiting groove spaced apart from the flow passage hole. The end of the second side of the first seat and the end of the second side of the first retaining ring can abut against the first annular limiting groove and the second annular limiting groove. At the same time, the end of the second side of the second seat and the end of the second side of the second retaining ring can abut against the first annular limiting groove and the second annular limiting groove, so as to achieve axial limiting of the ball valve core.

[0020] In some embodiments, each ball valve assembly further includes a plurality of preload feeders disposed between the adjusting nut and the support ring. The plurality of preload feeders are capable of deforming simultaneously under the pressure of the adjusting nut and the support ring to accumulate elastic potential energy and generate elastic force on the adjusting nut and the support ring.

[0021] In some embodiments, each ball valve assembly further includes an operating rod and a valve stem. The ball valve core has a valve core body, a driven end, and a supporting end. The valve core body is provided with the flow passage. The supporting end is supported on a plug inside the valve body. The valve stem is disposed inside the valve body. One end of the valve stem is connected to the driven end, and the other end of the valve stem is connected to the operating rod.

[0022] Furthermore, a third sealing assembly is provided on the outer periphery of the valve stem, which is used to seal the outer peripheral surface of the valve stem and the inner peripheral surface of the valve body, and allows the valve stem to rotate relative to the valve body.

[0023] In some embodiments, the valve body has an assembly hole extending through its inner and outer sides. The axial direction of the assembly hole is perpendicular to the axial direction of the fluid channel and is divided into a first hole segment and a second hole segment by the fluid channel. The driven end is located in the first hole segment and the supporting end is located in the second hole segment.

[0024] Furthermore, a step is provided within the first hole section, and a boss is formed on the outer periphery of the valve stem. A retaining ring is fitted onto the boss, and the retaining ring is connected within the step.

[0025] In some embodiments, each of the ball valve assemblies further includes a first bearing and a second bearing, a flange is formed on the outer periphery of the driven end, the first bearing is sleeved on the outer periphery of the driven end and is located between the flange and the boss;

[0026] The second bearing is sleeved on the outer periphery of the support end and supported on the plug.

[0027] In some embodiments, the vent ball valve further includes a needle valve assembly, and the valve body is provided with a vent channel that communicates with the middle of the fluid channel. The needle valve assembly is used to control the opening and closing of the vent channel.

[0028] In some embodiments, the needle valve assembly includes a lower valve stem, an upper valve stem, a packing gland, a packing seal assembly, and an operating handle. The packing gland has a through-hole and is screwed into the interior of the venting channel. The first end of the upper valve stem is screwed into the interior of the packing gland and can be axially adjusted relative to the packing gland. The lower valve stem is connected to the end of the first end of the upper valve stem. The operating handle is connected to the second end of the upper valve stem. The packing seal assembly is used to seal between the lower valve stem and the inner circumferential surface of the venting channel.

[0029] In a second aspect, the present invention also provides an assembly method for a bidirectional torque dual isolation relief ball valve, based on the bidirectional torque dual isolation relief ball valve as described in the first aspect, the assembly method comprising the following steps:

[0030] S1. First, use a tool to screw the adjusting nut of one of the ball valve components into one section of the fluid passage of the valve body, and then stack multiple preload supply components into the fluid passage of that section.

[0031] S2. Place the first sealing component, the first seat and the first retaining ring onto the support ring in sequence, and place the assembled support ring into the fluid channel section;

[0032] S3. Place the third sealing assembly and retaining ring onto the valve stem from top to bottom;

[0033] S4. Place the first bearing on the outer circumference of the driven end of the ball valve core, and place the second bearing on the outer circumference of the supporting end of the ball valve core.

[0034] S5. Fit the sealing assembly onto the outer circumference of the plug;

[0035] S6. Place the valve stem assembled in step S3, the ball valve core assembled in step S4, and the plug assembled in step S5 into the assembly hole of the valve body in sequence, so that the driven end of the valve stem and the ball valve core is located in the first hole section of the assembly hole, the supporting end of the plug and the ball valve core is located in the second hole section, and the valve core body of the ball valve core is located in the fluid channel.

[0036] S7. Use a tool to rotate the adjusting nut a certain distance relative to the fluid passage, and make the adjusting nut generate a certain pushing force on the valve core body;

[0037] S8. Place the second sealing assembly, the second seat, the second retaining ring, and the locking nut into the gland according to their respective positions. Screw the assembled gland onto the valve body so that the end of the gland extends into the fluid passage and abuts against the valve core body. Then, use a tool to apply torque to the gland so that the gland can form a certain back pressure on the valve core body. Finally, use the locking nut to lock the gland.

[0038] S9. Repeat steps S1-S8 above to assemble another ball valve assembly on the valve body;

[0039] S10. Install an operating lever at the end of the valve stem of each ball valve assembly.

[0040] In some embodiments, the assembly method further includes the following steps:

[0041] S11. Install the packing seal assembly on the lower valve stem, and assemble the assembled lower valve stem on the first end of the upper valve stem. Then, install the assembled lower valve stem and upper valve stem together into the venting passage of the valve body.

[0042] S12. Install a packing gland on the valve body and apply torque to the packing gland using a tool. The packing gland is threaded to the inside of the opening of the relief channel and the outer periphery of the upper valve stem.

[0043] S13. Install the operating handle on the second end of the upper valve stem to complete the assembly of the needle valve assembly.

[0044] In some embodiments, in step S7, the pushing force applied by the adjusting nut to the valve core body is N1, and in step S8, the back pressure applied by the gland to the valve core body is N2. The difference NΔ between N1 and N2 is less than or equal to 2 Newtons.

[0045] As can be seen from the above technical solutions, the present invention has the following advantages:

[0046] This bidirectional torque double-isolation relief ball valve includes a valve body and two sets of ball valve assemblies. The valve body has an internal fluid channel. Both sets of ball valve assemblies are mounted on the valve body and connected to both ends of the fluid channel. Both sets of ball valve assemblies are used for opening and closing the fluid channel, thus enabling the ball valve to achieve a high-flow-rate double-isolation single-relief flow channel function. Each set of ball valve assemblies includes a ball valve core, an adjusting nut, a valve seat, and a gland. The ball valve core is located inside the valve body and has a flow passage. The ball valve core can rotate relative to the valve body to adjust its position, allowing the flow passage and the fluid channel to be connected or disconnected. The first and second seats of the valve seat are located on opposite sides of the ball valve core. The first seat is connected to the edge of one end of the flow passage, and the second seat is connected to the other end of the flow passage. The ball valve features an edge connection, with an adjusting nut screwed into the center of the fluid channel and adjustable in position relative to the axial direction of the fluid channel. The gland is internally connected and screwed into the end of the fluid channel, also adjustable in position relative to the axial direction of the fluid channel. The adjusting nut pushes against the first seat, causing it to move away from the center of the fluid channel. Simultaneously, the gland applies back pressure to the second seat, causing it to move closer to the center of the fluid channel. This allows the ball valve to apply reverse pushing and back pressure to the ball valve core, limiting its position and achieving radial limiting to prevent eccentricity and damage during rotation. This enables the ball valve to achieve long-term reliable isolation and relief control in critical isolation applications.

[0047] This assembly method, based on the ball valve described above, can optimize the ball valve assembly process, making it easier to assemble and maintain the ball valve. Attached Figure Description

[0048] To more clearly illustrate the technical solutions in this invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0049] Figure 1 This is a schematic diagram of the structure of a bidirectional torque double isolation relief ball valve according to an embodiment of this application;

[0050] Figure 2 yes Figure 1 The internal cross-sectional view of the ball valve shown is shown below;

[0051] Figure 3 yes Figure 2 Enlarged view of region A in the middle;

[0052] Figure 4 yes Figure 3 Enlarged view of region B in the middle;

[0053] Figure 5 yes Figure 2 An internal cross-sectional view of the ball valve assembly shown;

[0054] Figure 6 yes Figure 2 An internal cross-sectional view of the needle valve assembly shown;

[0055] Figure 7 yes Figure 1 A schematic diagram showing the side view of the ball valve;

[0056] Figure 8 yes Figure 7 The diagram shows the location of the vent hole.

[0057] The meanings of the reference numerals in the attached figures are as follows:

[0058] 10. Valve body; 20. Ball valve assembly; 30. Needle valve assembly;

[0059] 1. Fluid passage; 2. Ball valve core; 21. Flow hole; 22. Valve core body; 23. Driven end; 231. Flange; 24. Support end; 3. Adjusting nut; 4. Valve seat; 41. First seat body; 411. First receiving groove; 42. Second seat body; 421. Second receiving groove; 5. Gland; 51. Second annular groove; 6. Support ring; 61. First annular groove; 7. First sealing assembly; 8. Second sealing assembly; 9. First protective ring; 91. First inner ring portion; 11. Second protective ring; 111. Second inner ring portion; 12. 13. Second annular limiting groove; 14. Preload supply component; 15. Operating lever; 16. Valve stem; 161. Boss; 17. Plug; 18. Third sealing assembly; 19. Assembly hole; 191. First hole section; 192. Second hole section; 193. Step; 25. Retaining ring; 26. First bearing; 27. Second bearing; 28. Relief channel; 29. ​​Lower valve stem; 31. Upper valve stem; 32. Packing gland; 33. Packing seal assembly; 34. Operating handle; 35. Fourth sealing assembly; 36. Relief hole. Detailed Implementation

[0060] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0061] In the description of this invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0063] like Figures 1-8 As shown, the first aspect of the present invention provides a bidirectional torque dual isolation relief ball valve, including a valve body 10 and two sets of ball valve assemblies 20. The valve body 10 is provided with a fluid channel 1. The two sets of ball valve assemblies 20 are both disposed on the valve body 10 and are respectively connected to the two ends of the fluid channel 1. The two sets of ball valve assemblies 20 are used for opening and closing control of the fluid channel 1. Thus, the ball valve can achieve the functional effect of a large flow rate dual isolation single relief flow channel, which is suitable for use in industries such as petroleum, chemical, petrochemical and power.

[0064] Each ball valve assembly 20 includes a ball valve core 2, an adjusting nut 3, a valve seat 4, and a gland 5.

[0065] The ball valve core 2 is located inside the valve body 10. The ball valve core 2 is provided with a flow passage 21. The ball valve core 2 can rotate relative to the valve body 10 to adjust its position so that the flow passage 21 and the fluid channel 1 are connected or not connected.

[0066] The valve seat 4 has a first seat body 41 and a second seat body 42, which are disposed on opposite sides of the ball valve core 2. The first seat body 41 is connected to the edge of one end of the flow hole 21, and the second seat body 42 is connected to the edge of the other end of the flow hole 21.

[0067] The adjusting nut 3 is screwed into the middle of the fluid channel 1 and its position can be adjusted axially relative to the fluid channel 1.

[0068] The pressure cap 5 is internally permeable and is screwed onto the end of the fluid channel 1, and its position can be adjusted axially relative to the fluid channel 1.

[0069] The adjusting nut 3 pushes the first seat 41, causing it to move away from the center of the fluid channel 1. Meanwhile, the gland 5 applies back pressure to the second seat 42, causing it to move closer to the center of the fluid channel 1. Thus, the ball valve can apply reverse pushing and back pressure to the ball valve core 2 to limit its position and achieve radial limiting, preventing the ball valve core 2 from becoming eccentric and avoiding damage when twisting it. This allows the ball valve to achieve long-term reliable isolation and relief control in critical isolation applications.

[0070] For each ball valve core 2 of the ball valve assembly 20, the force couple acting on the ball valve core 2 reaches a self-balancing state. This design ensures that the ball valve core 2 is subjected to uniform force during operation, avoiding eccentric wear caused by unidirectional stress, thereby significantly improving the dynamic stability and long-term sealing reliability of the ball valve core 2. The improvement in long-term sealing reliability directly guarantees its core function of isolating critical areas and ensuring no leakage.

[0071] The valve core body 22 of the ball valve core 2 is spherical, and the inside of the valve core body 22 is provided with a flow hole 21; the first seat 41 is annular, and the inner annular surface of the first seat 41 is curved, which can fit well with the circumferential surface of one side of the valve core body 22. Thus, under the pushing action of the adjusting nut 3, the first seat 41 pushes the valve core body 22 while maintaining the position of the valve core body 22. Similarly, the second seat 42 is also annular, and the inner annular surface of the second seat 42 is curved, which can fit well with the circumferential surface of the other side of the valve core body 22. Thus, under the back pressure of the pressure cap 5, the second seat 42 back pressures the valve core body 22 while maintaining the position of the valve core body 22. Under the synergistic action of the adjusting nut 3 and the pressure cap 5, the radial limit of the ball valve core 2 can be achieved to prevent the ball valve core 2 from being eccentric.

[0072] The adjusting nuts 3 of both sets of ball valve assemblies 20 are located in the fluid channel 1 of the valve body 10, and the adjusting nuts 3 are arranged near the middle of the fluid channel 1. The glands 5 of the two sets of ball valve assemblies 20 are respectively located at both ends of the fluid channel 1. When the ball valve cores 2 of both sets of ball valve assemblies 20 are connected to the fluid channel 1, the flow path of the fluid in this ball valve is: from the inside of the gland 5 of one ball valve assembly 20, through the flow hole 21 of the ball valve core 2 and the adjusting nut 3, to the adjusting nut 3 of the other ball valve assembly 20, through the flow hole 21 of the ball valve core 2 and the inside of the gland 5.

[0073] Since this ball valve is used in hydraulic system pipelines in industries such as petroleum, chemical, petrochemical and power, the fluid in these hydraulic system pipelines has a certain pressure. When the fluid passes through this ball valve, the fluid may leak from the gap between the adjusting nut 3 and the inner circumferential surface of the fluid channel 1, or from the gap between the gland 5 and the inner circumferential surface of the fluid channel 1, and leak into the environment, causing material loss and pollution to the surrounding environment.

[0074] To avoid the above problems, fluid leakage should be prevented from the gap between the adjusting nut 3 and the inner circumferential surface of the fluid channel 1, as well as from the gap between the gland 5 and the inner circumferential surface of the fluid channel 1.

[0075] A support ring 6 is provided on the side of the adjusting nut 3 facing the first seat 41. The support ring 6 abuts against the side edge of the first seat 41. A first sealing component 7 is provided on the outer periphery of the support ring 6. The first sealing component 7 is sealed to the inner side of the fluid channel 1. The first sealing component 7 can effectively prevent fluid from leaking between the support ring 6 and the inner periphery of the fluid channel 1, so that the fluid only passes through the inside of the support ring 6 and the adjusting nut 3.

[0076] A second sealing component 8 is provided on the outer periphery of the end of the gland 5 that extends into the fluid channel 1. The second sealing component 8 is sealed to the inner side of the fluid channel 1. The second sealing component 8 can effectively prevent fluid from leaking between the gland 5 and the inner circumferential surface of the fluid channel 1, so that the fluid only passes through the inside of the gland 5.

[0077] By providing a first sealing component 7 on the outer circumferential surface of the support ring 6 and a second sealing component 8 on the outer circumferential surface of the gland 5, fluid leakage between the two can be effectively prevented.

[0078] When assembling the ball valve assembly 20 on the valve body 10, a tool such as an Allen wrench can be used to screw the adjusting nut 3 into a specific position inside the fluid channel 1. The outer circumferential surface of the adjusting nut 3 is threadedly connected to the inner circumferential surface at the middle position of the fluid channel 1. The Allen wrench can be inserted into the fluid channel 1 from the open end of the fluid channel 1 and locked in the Allen groove of the adjusting nut 3. By turning the Allen wrench, the adjusting nut 3 can be rotated to adjust the position of the adjusting nut 3 in the axial direction of the fluid channel 1.

[0079] After the ball valve core 2 is installed inside the valve body 10, a certain torque can be applied to the adjusting nut 3 using a tool such as a torque wrench, so that the adjusting nut 3 generates a pushing force on the support ring 6. The pushing force is transmitted to the ball valve core 2 through the support ring 6 and the first seat 41, thereby forming a pushing force on the ball valve core 2 in its radial direction.

[0080] Next, the gland 5 is assembled onto the valve body 10, with one end of the gland 5 extending into the fluid passage 1. A certain torque is applied to the gland 5 using a tool such as a torque wrench, so that the gland 5 generates back pressure on the second seat 42. The back pressure is transmitted to the ball valve core 2 through the second seat 42, thereby forming a back pressure on the ball valve core 2 in its radial direction.

[0081] Both the first seat 41 and the second seat 42 are annular. In order to fit the outer contour of the ball valve core 2, the inner annular surface of the first seat 41 and the inner annular surface of the second seat 42 are both flared curved surfaces. At this time, under the pushing action of the adjusting nut 3, the inner annular surface of the first seat 41 may undergo excessive deformation. Similarly, under the back pressure of the gland 5, the inner annular surface of the second seat 42 may also undergo excessive deformation. This causes the inner annular surface of the first seat 41 to not be able to be tightly connected with the outer peripheral surface of one side of the ball valve core 2, and the inner annular surface of the second seat 42 to not be able to be tightly connected with the outer peripheral surface of the other side of the ball valve core 2. As a result, the first seat 41 and the second seat 42 cannot maintain the position of the ball valve core 2 and cannot form a good radial limit for the ball valve core 2, resulting in the ball valve core 2 being eccentric and increasing the wear of the ball valve core 2 when it twists.

[0082] To prevent deformation of the first seat 41 and the second seat 42, especially the inner ring surface of the first seat 41 and the inner ring surface of the second seat 42, each ball valve assembly 20 also includes a first retaining ring 9 and a second retaining ring 11. The first retaining ring 9 is fitted around the outer periphery of the first seat 41. The first retaining ring 9 can axially press the first seat 41 and prevent loosening and rotation, so that the first seat 41 can firmly hold the outer periphery of the ball valve core 2 and effectively prevent deformation of the first seat 41. The second retaining ring 11 is fitted around the outer periphery of the second seat 42. The second retaining ring 11 can axially press the second seat 42 and prevent loosening and rotation, so that the second seat 42 can firmly hold the outer periphery of the ball valve core 2 and effectively prevent deformation of the second seat 42.

[0083] By setting the first retaining ring 9 and the second retaining ring 11, the inner ring surface of the first seat 41 and the inner ring surface of the second seat 42 will not undergo excessive deformation. This ensures that the inner ring surface of the first seat 41 can be well and tightly connected with the outer peripheral surface of one side of the ball valve core 2, and the inner ring surface of the second seat 42 can be well and tightly connected with the outer peripheral surface of the other side of the ball valve core 2. This allows the first seat 41 and the second seat 42 to maintain the position of the ball valve core 2 for a long time, forming a good radial limit on the ball valve core 2 to prevent the ball valve core 2 from being eccentric.

[0084] To increase the connection strength between the support ring 6 and the first seat 41, optionally, the end of the support ring 6 is provided with a first annular groove 61, the first seat 41 is fitted onto the first annular groove 61, and the side of the first side of the first seat 41 and the side of the first side of the first guard ring 9 abut against the side of the first annular groove 61.

[0085] Similarly, in order to increase the connection strength between the pressure cap 5 and the second seat 42, a second annular groove 51 is provided at the end of the pressure cap 5, the second seat 42 is fitted on the second annular groove 51, and the side of the first side of the second seat 42 and the side of the first side of the second protective ring 11 abut against the side of the second annular groove 51.

[0086] Meanwhile, in order to increase the connection strength between the first seat 41 and the first protective ring 9, a first receiving groove 411 is provided at the outer edge of the first side of the first seat 41, and a first inner ring portion 91 is formed on the first side of the first protective ring 9, and the first inner ring portion 91 is connected to the first receiving groove 411.

[0087] Similarly, in order to increase the connection strength between the second seat 42 and the second retaining ring 11, a second receiving groove 421 is provided at the outer edge of the first side of the second seat 42, and a second inner ring portion 111 is formed on the first side of the second retaining ring 11, which is connected to the second receiving groove 421.

[0088] The first seat 41 has a portion fitted inside the first annular groove 61, and the other portion has an inner annular surface that can be tightly connected to the outer circumferential surface of the ball valve core 2; the second seat 42 has a portion fitted inside the second annular groove 51, and the other portion has an inner annular surface that can be tightly connected to the outer circumferential surface of the ball valve core 2. Thus, the first seat 41 and the second seat 42 together radially limit the ball valve core 2.

[0089] Based on this, a first annular limiting groove 12 and a second annular limiting groove 13 are provided on the ball valve core 2, spaced apart by the flow hole 21. The end of the second side of the first seat 41 and the end of the second side of the first guard ring 9 can abut in the first annular limiting groove 12 and the second annular limiting groove 13. At the same time, the end of the second side of the second seat 42 and the end of the second side of the second guard ring 11 can abut in the first annular limiting groove 12 and the second annular limiting groove 13 to achieve axial limiting of the ball valve core 2.

[0090] Thus, through the limiting effect of the first seat 41, the second seat 42, the first retaining ring 9, and the second retaining ring 11, the ball valve core 2 can be limited along its radial direction and its axial direction, so that the ball valve core 2 is suspended at the fluid channel 1 and does not directly contact the inner circumferential surface of the fluid channel 1. This ensures the perpendicularity of the ball valve core 2 along its axial direction when it is twisted to rotate. This can effectively avoid the deviation of the position of the ball valve core 2 caused by fluid impact, which would affect the subsequent effect of closing the fluid channel 1.

[0091] After prolonged use, the adjusting nut 3 and the gland 5 may become loose due to fluid impact.

[0092] The gland 5 has one end inserted into the fluid channel 1 and the other end located outside the fluid channel 1. This end is connected to the valve body 10 via a lock nut. When the gland 5 becomes loose, loosen the lock nut, screw the gland 5 back into the fluid channel 1, and then tighten the lock nut to complete the adjustment of the gland 5.

[0093] When the adjusting nut 3 becomes loose, to tighten it, the pressure cap 5 must be removed, the torque wrench inserted into the fluid channel 1 and engaged with the internal hexagonal socket of the adjusting nut 3, and the torque wrench rotated to tighten the adjusting nut 3.

[0094] The above process involves a rather cumbersome method of tightening the adjusting nut 3. It requires removing the ball valve from the hydraulic pipeline system and then disassembling the gland 5, among other operations. This is not only time-consuming and labor-intensive, affecting the pipeline transportation work, but may also cause the ball valve core 2 to become eccentric when the gland 5 is subsequently installed, thus affecting the service life of the ball valve core 2.

[0095] Therefore, it is advisable to set the adjusting nut 3 to self-balancing adjustment, that is, after the ball valve has been used for a long time, the adjusting nut 3 will not easily loosen relative to the inner circumference of the fluid channel 1, so that the force between the adjusting nut 3 and the support ring 6 will always be within the set range.

[0096] Specifically, each ball valve assembly 20 also includes multiple preload supply components 14, which are disposed between the adjusting nut 3 and the support ring 6. The multiple preload supply components 14 can deform simultaneously under the pressure of the adjusting nut 3 and the support ring 6 to accumulate elastic potential energy and generate elastic force on the adjusting nut 3 and the support ring 6.

[0097] When assembling the ball valve assembly 20, first use a tool to screw the adjusting nut 3 into one section of the fluid channel 1 of the valve body 10. Then, stack multiple preload supply components 14 into this section of the fluid channel 1. Next, place the first sealing assembly 7, the first seat 41, and the first retaining ring 9 onto the support ring 6 in sequence, and then place the assembled support ring 6 into this section of the fluid channel 1. After the assembled ball valve core 2 is installed into the mounting hole 19 of the valve body 10, use a tool to screw the adjusting nut 3 out a certain distance relative to the fluid channel 1, and then screw the adjusting nut 3... A certain pushing force is generated on multiple preload supply components 14. The multiple preload supply components 14 push the support ring 6, the support ring 6 pushes the first seat 41, the first seat 41 pushes the valve core body 22 of the ball valve core 2, and the valve core body 22 will generate a reaction force on the first seat 41, so that the support ring 6 generates a reaction force on the adjusting nut 3 through the multiple preload supply components 14. Thus, the multiple preload supply components 14 deform simultaneously under the pressure of the adjusting nut 3 and the support ring 6 to accumulate elastic potential energy and generate elastic force on the adjusting nut 3 and the support ring 6.

[0098] After prolonged use, the adjusting nut 3 may show signs of loosening under the impact of fluid. At the moment the adjusting nut 3 actually loosens, multiple preload supply components 14 tend to restore their shape and form a stable support between the adjusting nut 3 and the support ring 6. This ensures that the force can still be well transmitted between the adjusting nut 3 and the support ring 6, allowing the support ring 6 to support the first seat 41 and radially limit the valve core body 22 of the ball valve core 2. In this way, by setting multiple preload supply components 14, the self-balancing adjustment of the adjusting nut 3 is achieved, effectively preventing the adjusting nut 3 from loosening.

[0099] The preload supply component 14 is preferably a disc spring. The disc spring generates elastic force through pre-compression, pushing the support ring 6 and the first seat 41 towards the ball valve core 2, forming an initial sealing pressure between the sealing pairs. The disc spring can provide good preload force, which is the basis for the ball valve to achieve zero leakage. Even when the fluid pressure is low or zero, it can ensure that the inner ring surface of the first seat 41 is in close contact with the outer circumferential surface of the ball valve core 2.

[0100] Each ball valve assembly 20 also includes an operating lever 15 and a valve stem 16. The ball valve core 2 has a valve core body 22, a driven end 23, and a support end 24. The valve core body 22 is provided with a flow passage 21. The support end 24 is supported on a plug 17 inside the valve body 10. The valve stem 16 is located inside the valve body 10. One end of the valve stem 16 is connected to the driven end 23, and the other end of the valve stem 16 is connected to the operating lever 15.

[0101] The operating lever 15 can be manually turned to drive the valve stem 16 to rotate, which in turn drives the ball valve core 2 to rotate. This allows the flow passage 21 on the valve core body 22 to be connected to or disconnected from the fluid channel 1. When the flow passage 21 on both sets of ball valve assemblies 20 is connected to the fluid channel 1, fluid can flow in from the gland 5 of one ball valve assembly 20, through the flow passage 21, the inside of the support ring 6, and the inside of the adjusting nut 3 of this ball valve assembly 20, and then flow into the adjusting nut 3 of the other ball valve assembly 20. After passing through the inside of the support ring 6, the flow passage 21 on the valve core body 22, and the gland 5 of this ball valve assembly 20, fluid flows into other pipelines of the hydraulic pipeline system.

[0102] Furthermore, a third sealing assembly 18 is provided on the outer periphery of the valve stem 16. The third sealing assembly 18 is used to seal the outer peripheral surface of the valve stem 16 and the inner peripheral surface of the valve body 10, and allows the valve stem 16 to rotate relative to the valve body 10.

[0103] The third sealing assembly 18 adopts a combined sealing form to strictly seal the outer peripheral surface of the valve stem 16 and the interior of the valve body 10, preventing fluid leakage from the gap between the valve stem 16 and the valve body 10. The third sealing assembly 18 can be implemented by using existing common components, and the third sealing assembly 18 can allow the valve stem 16 to rotate relative to the valve body 10.

[0104] Specifically, the valve body 10 has an assembly hole 19 extending through its inner and outer sides. The axial direction of the assembly hole 19 is perpendicular to the axial direction of the fluid channel 1 and is divided into a first hole section 191 and a second hole section 192 by the fluid channel 1. The driven end 23 is located in the first hole section 191, the supporting end 24 is located in the second hole section 192, and the valve core body 22 is located between the first hole section 191 and the second hole section 192.

[0105] The plug 17 is disposed inside the second hole section 192. The fourth sealing component 35 is sleeved on the outer periphery of the plug 17. The fourth sealing component 35 can be sealed to the inner peripheral surface of the second hole section 192, which can effectively prevent fluid from leaking from the gap between the plug 17 and the inner peripheral surface of the second hole section 192.

[0106] Furthermore, a step 193 is provided in the first hole section 191, and a boss 161 is formed on the outer periphery of the valve stem 16. A retaining ring 25 is fitted on the boss 161 and connected to the step 193. The retaining ring 25 can prevent the surface of the boss 161 of the valve stem 16 from directly contacting the inner peripheral surface of the valve body 10, and prevent the valve stem 16 from excessive wear after repeated twisting of the valve stem 16, causing the valve stem 16 to be eccentric, thereby affecting the connection between the valve stem 16 and the driven end 23 of the ball valve core 2, resulting in a loose connection.

[0107] It should be noted that the first sealing component 7, the second sealing component 8, and the fourth sealing component 35 can be selected from existing sealing components, including O-ring seals, etc., and these sealing components can achieve good sealing in their respective positions.

[0108] Specifically, one end of the valve stem 16 extending into the first hole section 191 engages with the driven end 23 of the ball valve core 2, allowing the ball valve core 2 to rotate under the drive of the valve stem 16. Each ball valve assembly 20 also includes a first bearing 26 and a second bearing 27. A flange 231 is formed on the outer periphery of the driven end 23. The first bearing 26 is sleeved on the outer periphery of the driven end 23 and is located between the flange 231 and the boss 161. The second bearing 27 is sleeved on the outer periphery of the support end 24 and is supported on the plug 17. By setting the first bearing 26 and the second bearing 27, the rotation of the ball valve core 2 is made easier and smoother, so as to effectively reduce the wear caused by the rotation of the ball valve core 2.

[0109] This ball valve also includes a needle valve assembly 30, and the valve body 10 is also provided with a relief channel 28, which is connected to the middle of the fluid channel 1. The needle valve assembly 30 is used to control the opening and closing of the relief channel 28.

[0110] When the pressure of the fluid flowing in the fluid channel 1 is too high, one of the ball valve assemblies 20 can be closed and the needle valve assembly 30 can be opened to connect the relief channel 28 and the fluid channel 1, so that the fluid flows from the fluid channel 1 into the relief channel 28 and flows out from the relief hole 36 on the valve body 10. This can effectively reduce the pressure of the ball valve and the pipeline at this location, protect the ball valve, and enable the ball valve to be put into long-term use.

[0111] The needle valve assembly 30 includes a lower valve stem 29, an upper valve stem 31, a packing gland 32, a packing seal assembly 33, and an operating handle 34. The packing gland 32 is internally permeable and screwed into the interior of the venting channel 28. The first end of the upper valve stem 31 is screwed into the interior of the packing gland 32 and its position can be adjusted axially relative to the packing gland 32. The lower valve stem 29 is connected to the end of the first end of the upper valve stem 31. The operating handle 34 is connected to the second end of the upper valve stem 31. The packing seal assembly 33 is used to seal the inner circumferential surface between the lower valve stem 29 and the venting channel 28.

[0112] The operating handle 34 can be manually turned to rotate the upper and lower valve stems 29. When the upper valve stem 31 is rotated, it can move axially relative to the packing gland 32, so that the end of the lower valve stem 29 can abut against the inner circumferential surface of the venting channel 28. At this time, the venting channel 28 is not connected to the fluid channel 1. Alternatively, the end of the lower valve stem 29 is not in contact with the inner circumferential surface of the venting channel 28. At this time, the venting channel 28 is connected to the fluid channel 1, and the pipeline pressure in the fluid channel 1 can be released through the venting channel 28.

[0113] The packing seal assembly 33 can provide a good seal between the lower valve stem 29 and the inner circumferential surface of the discharge channel 28, preventing fluid leakage from this channel, which would cause material loss and environmental pollution. The packing seal assembly 33 can be made of materials commonly used for packing seals in the prior art.

[0114] In a second aspect, this invention also provides an assembly method for a bidirectional torque double isolation relief ball valve. Based on the bidirectional torque double isolation relief ball valve as described in the first aspect, the assembly method includes the following steps:

[0115] S1. First, use a tool to screw the adjusting nut 3 of one of the ball valve components 20 into one section of the fluid passage 1 of the valve body 10, and then stack multiple preload supply parts 14 into the fluid passage 1 of that section.

[0116] S2. Place the first sealing component 7, the first seat 41 and the first protective ring 9 onto the support ring 6 in sequence, and place the assembled support ring 6 into the fluid channel 1.

[0117] S3. Place the third sealing assembly 18 and the retaining ring 25 onto the valve stem 16 from top to bottom;

[0118] S4. Place the first bearing 26 on the outer periphery of the driven end 23 of the ball valve core 2, and place the second bearing 27 on the outer periphery of the supporting end 24 of the ball valve core 2.

[0119] S5. Fit the sealing assembly onto the outer periphery of the plug 17;

[0120] S6. Place the valve stem 16 assembled in step S3, the ball valve core 2 assembled in step S4, and the plug 17 assembled in step S5 into the assembly hole 19 of the valve body 10 in sequence, so that the driven end 23 of the valve stem 16 and the ball valve core 2 is located in the first hole section 191 of the assembly hole 19, the plug 17 and the supporting end 24 of the ball valve core 2 are located in the second hole section 192, and the valve core body 22 of the ball valve core 2 is located in the fluid channel 1.

[0121] S7. Use a tool to rotate the adjusting nut 3 a certain distance relative to the fluid channel 1, and make the adjusting nut 3 generate a certain pushing force on the valve core body 22.

[0122] S8. Place the second sealing assembly 8, the second seat 42, the second protective ring 11 and the locking nut on the gland 5 according to their respective positions. Screw the assembled gland 5 onto the valve body 10 so that the end of the gland 5 extends into the interior of the fluid passage 1 and abuts against the valve core body 22. Then, use a tool to apply torque to the gland 5 so that the gland 5 can form a certain back pressure on the valve core body 22. Finally, use the locking nut to lock the gland 5.

[0123] S9. Repeat steps S1-S8 above to assemble another ball valve assembly 20 on the valve body 10;

[0124] S10. An operating lever 15 is installed at the end of the valve stem 16 of each ball valve assembly 20, thus completing the assembly of the ball valve assembly 20 on the valve body 10.

[0125] Therefore, this assembly method optimizes the assembly process of the ball valve. The double ball valve assembly 20 is highly integrated inside the valve body 10. Compared with the existing double isolation relief ball valve, the number of parts can be significantly reduced. The reduction in the number of parts directly reduces the connection interface and sealing links, effectively reducing external leakage points. This not only reduces the risk of media leakage caused by too many sealing points, but also simplifies the complexity of sealing management.

[0126] In this assembly method, for a ball valve assembly 20, the valve stem 16 and its related components are assembled into a module, the ball valve core 2 and its related components are assembled into a module, the plug 17 is assembled into a module, and the gland 5 is assembled into a module. Then, the assembled valve stem 16, ball valve core 2, plug 17, and other modules are sequentially installed into the valve body 10. Finally, the assembled gland 5 is screwed into the valve body 10. In this way, the ball valve assembly 20 forms a modular and easy-to-disassemble layout, which effectively reduces the installation difficulty and time cost of the ball valve, and also reduces the skill requirements for operators. When maintenance is required, the efficiency of disassembling and reassembling the ball valve is also significantly improved, which greatly improves the maintainability of the product.

[0127] In this assembly method, the needle valve assembly 30 is installed into the valve body 10, including the following steps:

[0128] S11. Install the packing seal assembly 33 on the lower valve stem 29, and assemble the assembled lower valve stem 29 on the first end of the upper valve stem 31. Then, install the assembled lower valve stem 29 and the upper valve stem 31 together into the venting channel 28 of the valve body 10.

[0129] S12. Install the packing gland 32 on the valve body 10 and apply torque to the packing gland 32 using a tool. The packing gland 32 is threaded to the inside of the opening of the relief channel 28 and the outer periphery of the upper valve stem 31.

[0130] S13. Install the operating handle 34 on the second end of the upper valve stem 31 to complete the assembly of the needle valve assembly 30.

[0131] In step S7 above, the pushing force applied by the adjusting nut 3 to the valve core body 22 is N1. In step S8 above, the back pressure applied by the gland 5 to the valve core body 22 is N2. The difference NΔ between N1 and N2 is less than or equal to 2 Newtons.

[0132] N1 and N2 are equal or close, with a difference of no more than 2 Newtons between them. For each ball valve core 2 of the ball valve assembly 20, the torque is applied on both sides so that the force couple acting on the ball valve core 2 reaches a self-balancing state. This design ensures that the ball valve core 2 is subjected to uniform force during operation, avoiding eccentric wear caused by unidirectional stress, thereby significantly improving the dynamic stability and long-term sealing reliability of the ball valve core 2. The improvement in long-term sealing reliability directly guarantees its core function of isolating critical areas and ensuring no leakage.

[0133] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A bidirectional torque double isolation relief ball valve, characterized in that, The device includes a valve body and two sets of ball valve assemblies. The valve body has a fluid channel inside. The two sets of ball valve assemblies are both disposed on the valve body and are respectively connected to the two ends of the fluid channel. The two sets of ball valve assemblies are used for opening and closing control of the fluid channel. Each ball valve assembly includes a ball valve core, an adjusting nut, a valve seat, and a gland; The ball valve core is disposed inside the valve body, and the ball valve core is provided with a flow passage. The ball valve core can rotate relative to the valve body to adjust its position so that the flow passage and the fluid channel are connected or not connected. The valve seat has a first seat body and a second seat body, which are disposed on opposite sides of the ball valve core. The first seat body is connected to the edge of one end of the flow passage, and the second seat body is connected to the edge of the other end of the flow passage. The adjusting nut is screwed into the middle of the fluid channel and its position can be adjusted relative to the axial direction of the fluid channel; The gland has a through-hole and is screwed onto the end of the fluid channel, and its position can be adjusted axially relative to the fluid channel. The adjusting nut pushes the first seat, causing it to move away from the center of the fluid channel. Meanwhile, the gland pushes the second seat, causing it to move closer to the center of the fluid channel, thus achieving radial limiting of the ball valve core.

2. The bidirectional torque dual isolation relief ball valve according to claim 1, characterized in that, A support ring is provided on the side of the adjusting nut facing the first seat, the support ring abuts against the side edge of the first seat, and a first sealing assembly is provided on the outer periphery of the support ring, the first sealing assembly being sealed to the inner side of the fluid channel; A second sealing assembly is provided on the outer periphery of the end of the gland that extends into the fluid channel, and the second sealing assembly is sealed to the inner side of the fluid channel.

3. The bidirectional torque dual isolation relief ball valve according to claim 2, characterized in that, Each ball valve assembly further includes a first retaining ring and a second retaining ring, the first retaining ring being fitted around the outer periphery of the first seat and the second retaining ring being fitted around the outer periphery of the second seat.

4. The bidirectional torque dual isolation relief ball valve according to claim 3, characterized in that, The end of the support ring is provided with a first annular groove, the first seat is sleeved on the first annular groove, and the side of the first side of the first seat and the side of the first side of the first guard ring abut against the side of the first annular groove. The end of the pressure cap is provided with a second annular groove, the second seat is fitted onto the second annular groove, and the side of the first side of the second seat and the side of the first side of the second protective ring abut against the side of the second annular groove.

5. The bidirectional torque dual isolation relief ball valve according to claim 4, characterized in that, A first receiving groove is provided at the outer edge of the first side of the first seat body, and a first inner ring portion is formed on the first side of the first protective ring, and the first inner ring portion is connected to the first receiving groove. A second receiving groove is provided at the outer edge of the first side of the second seat, and a second inner ring is formed on the first side of the second protective ring, the second inner ring being connected to the second receiving groove.

6. The bidirectional torque dual isolation relief ball valve according to claim 5, characterized in that, The ball valve core is provided with a first annular limiting groove and a second annular limiting groove spaced apart from the flow passage hole. The end of the second side of the first seat and the end of the second side of the first protective ring can abut against the first annular limiting groove and the second annular limiting groove. At the same time, the end of the second side of the second seat and the end of the second side of the second protective ring can abut against the first annular limiting groove and the second annular limiting groove, so as to achieve axial limiting of the ball valve core.

7. The bidirectional torque double isolation relief ball valve according to any one of claims 2-6, characterized in that, Each ball valve assembly further includes multiple preload supply components disposed between the adjusting nut and the support ring. These multiple preload supply components can deform simultaneously under the pressure of the adjusting nut and the support ring to accumulate elastic potential energy and generate elastic force on the adjusting nut and the support ring.

8. The bidirectional torque double isolation relief ball valve according to any one of claims 1-6, characterized in that, Each ball valve assembly further includes an operating rod and a valve stem. The ball valve core has a valve core body, a driven end, and a supporting end. The valve core body is provided with the flow passage hole. The supporting end is supported on a plug inside the valve body. The valve stem is disposed inside the valve body. One end of the valve stem is connected to the driven end, and the other end of the valve stem is connected to the operating rod. Furthermore, a third sealing assembly is provided on the outer periphery of the valve stem, which is used to seal the outer peripheral surface of the valve stem and the inner peripheral surface of the valve body, and allows the valve stem to rotate relative to the valve body.

9. The bidirectional torque dual isolation relief ball valve according to claim 8, characterized in that, The valve body has an assembly hole that extends through its inner and outer sides. The axis of the assembly hole is perpendicular to the axis of the fluid channel and is divided into a first hole segment and a second hole segment by the fluid channel. The driven end is located in the first hole segment and the supporting end is located in the second hole segment. Furthermore, a step is provided within the first hole section, and a boss is formed on the outer periphery of the valve stem. A retaining ring is fitted onto the boss, and the retaining ring is connected within the step.

10. The bidirectional torque dual isolation relief ball valve according to claim 9, characterized in that, Each ball valve assembly further includes a first bearing and a second bearing. A flange is formed on the outer periphery of the driven end. The first bearing is sleeved on the outer periphery of the driven end and is located between the flange and the boss. The second bearing is sleeved on the outer periphery of the support end and supported on the plug.

11. The bidirectional torque dual isolation relief ball valve according to claim 1, characterized in that, The venting ball valve also includes a needle valve assembly, and the valve body is provided with a venting channel, which is connected to the middle of the fluid channel. The needle valve assembly is used to control the opening and closing of the venting channel.

12. The bidirectional torque dual isolation relief ball valve according to claim 11, characterized in that, The needle valve assembly includes a lower valve stem, an upper valve stem, a packing gland, a packing seal assembly, and an operating handle. The packing gland has a through-hole and is screwed into the interior of the venting channel. The first end of the upper valve stem is screwed into the interior of the packing gland and can be axially adjusted relative to the packing gland. The lower valve stem is connected to the end of the first end of the upper valve stem. The operating handle is connected to the second end of the upper valve stem. The packing seal assembly is used to seal between the lower valve stem and the inner circumferential surface of the venting channel.

13. A method for assembling a bidirectional torque double isolation relief ball valve, based on the bidirectional torque double isolation relief ball valve as described in any one of claims 1-12, characterized in that, The assembly method includes the following steps: S1. First, use a tool to screw the adjusting nut of one of the ball valve components into one section of the fluid passage of the valve body, and then stack multiple preload supply components into the fluid passage of that section. S2. Place the first sealing component, the first seat and the first retaining ring onto the support ring in sequence, and place the assembled support ring into the fluid channel section; S3. Place the third sealing assembly and retaining ring onto the valve stem from top to bottom; S4. Place the first bearing on the outer circumference of the driven end of the ball valve core, and place the second bearing on the outer circumference of the supporting end of the ball valve core. S5. Fit the sealing assembly onto the outer circumference of the plug; S6. Place the valve stem assembled in step S3, the ball valve core assembled in step S4, and the plug assembled in step S5 into the assembly hole of the valve body in sequence, so that the driven end of the valve stem and the ball valve core is located in the first hole section of the assembly hole, the supporting end of the plug and the ball valve core is located in the second hole section, and the valve core body of the ball valve core is located in the fluid channel. S7. Use a tool to rotate the adjusting nut a certain distance relative to the fluid passage, and make the adjusting nut generate a certain pushing force on the valve core body; S8. Place the second sealing assembly, the second seat, the second retaining ring, and the locking nut into the gland according to their respective positions. Screw the assembled gland onto the valve body so that the end of the gland extends into the fluid passage and abuts against the valve core body. Then, use a tool to apply torque to the gland so that the gland can form a certain back pressure on the valve core body. Finally, use the locking nut to lock the gland. S9. Repeat steps S1-S8 above to assemble another ball valve assembly on the valve body; S10. Install an operating lever at the end of the valve stem of each ball valve assembly.

14. The assembly method according to claim 13, characterized in that, It also includes the following steps: S11. Install the packing seal assembly on the lower valve stem, and assemble the assembled lower valve stem on the first end of the upper valve stem. Then, install the assembled lower valve stem and upper valve stem together into the venting passage of the valve body. S12. Install a packing gland on the valve body and apply torque to the packing gland using a tool. The packing gland is threaded to the inside of the opening of the relief channel and the outer periphery of the upper valve stem. S13. Install the operating handle on the second end of the upper valve stem to complete the assembly of the needle valve assembly.

15. The assembly method according to claim 13, characterized in that, In step S7 above, the pushing force applied by the adjusting nut to the valve core body is N1, and in step S8 above, the back pressure applied by the gland to the valve core body is N2. The difference NΔ between N1 and N2 is less than or equal to 2 Newtons.

Images