A pneumatic DBB double ball valve with interlocking structure

Abstract

This invention discloses a pneumatic DBB double ball valve with an interlocking structure, comprising a valve body containing two switch balls and one pressure relief ball. Each switch ball has a synchronously rotating switch ball stem, and each pressure relief ball has a synchronously rotating pressure relief ball stem. The switch ball stems and pressure relief ball stems rotate synchronously with a linkage mechanism. The switch balls and pressure relief balls are sequentially inserted into a valve seat, a middle flange gasket, and a valve cover from one side of the valve body, respectively. The pneumatic linkage mechanism combines the two switch ball valves and the pressure relief ball valve inside the DBB for simultaneous operation, avoiding human error, improving operating speed, and enhancing safety.

Description

Technical Field

[0001] This invention relates to the field of valve-related technology, specifically to a pneumatic DBB double ball valve with an interlocking structure. Background Technology

[0002] The DBB double ball valve consists of two balls mounted on a single valve. Designed to replace the complex multi-valve connection in traditional pipelines, it reduces leakage points in the system. The double-ball sealing structure provides double-blocking and double-draining functionality, enabling rapid discharge and closure, maximizing space savings and reducing costs. Currently, most double ball valves are manually operated or controlled sequentially by multiple cylinders. However, existing technologies cannot eliminate the need for manual operation or synchronized rotation using a single cylinder. Operational errors or valve leaks can lead to significant losses and safety hazards, and multiple cylinders or manual operation require substantial installation space. Summary of the Invention

[0003] The purpose of this invention is to provide a pneumatic DBB double ball valve with an interlocking structure to solve the existing problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a pneumatic DBB double ball valve with an interlocking structure, comprising a valve body, wherein two switching balls and one pressure relief ball are disposed within the valve body, the switching balls are provided with synchronously rotating switching ball valve stems, and the pressure relief balls are provided with synchronously rotating pressure relief ball valve stems. The switching ball valve stems and pressure relief ball valve stems rotate synchronously with a linkage mechanism, and the switching balls and pressure relief balls are respectively inserted into a valve seat, a middle flange gasket, and a valve cover sequentially from one side of the valve body.

[0005] Preferably, the linkage mechanism includes a first linkage, a second linkage, a third linkage, a fourth linkage, a fifth linkage, and a connecting rod, wherein the connecting rod rotates synchronously with the angular stroke cylinder;

[0006] Link five connects two switch ball valve stems. Link two is connected to link five via a connecting pin. Link three is connected to link two. The connecting rod passes through the center of link three. The other end of the connecting rod is connected to an angular stroke cylinder. Link four is connected to link three. Link one is connected to link four. Link one is connected to the pressure relief ball valve stem.

[0007] Preferably, the connecting rod has an inner recess.

[0008] Preferably, the portions of the switch ball valve stem and the pressure relief ball valve stem inside the valve body are in contact with the valve body through thrust washers and packing. The thrust washers are disposed around the inner ends of the switch ball valve stem and the pressure relief ball valve stem, and the packing is disposed around the main body of the switch ball valve stem and the pressure relief ball valve stem.

[0009] Preferably, the packing is compressed by a packing gland, a disc spring, and a locking nut. The packing gland, disc spring, and locking nut are fitted onto the switch ball valve stem and the pressure relief ball valve stem. The packing gland and disc spring are located inside the locking nut. The packing gland presses against the packing. The locking nut is connected to the switch ball valve stem and the pressure relief ball valve stem respectively via threaded engagement.

[0010] Preferably, an anti-loosening block is also provided on the outside of the locking nut, and the anti-loosening block is used to lock the locking nut.

[0011] Preferably, the switch ball valve stem and the pressure relief ball valve stem have small openings with holes inside, and a spring and a steel ball are sequentially arranged in the holes.

[0012] Compared with the prior art, the beneficial effects of this invention are as follows: This application provides a pneumatic DBB double ball valve with an interlocking structure, which consists of three floating balls sharing a valve body. A rotary cylinder completes the valve opening and closing. When the valve needs to be opened, the two ball valves in the medium flow direction open, while the pressure-relief floating ball valve perpendicular to the medium flow direction closes. When the valve needs to be closed, the two floating ball valves in the medium flow direction close, while the pressure-relief floating ball valve perpendicular to the medium flow direction opens, thus relieving pressure in the pipeline between the two floating ball valves in the medium flow direction. The pneumatic linkage mechanism combines the two opening / closing ball valves and the pressure-relief ball valve inside the DBB for simultaneous operation, avoiding human error, improving operating speed, and enhancing safety. Attached Figure Description

[0013] Figure 1 This is a front cross-sectional view of the present invention;

[0014] Figure 2 This is a top view of the linkage mechanism in this invention;

[0015] Figure 3 This is a side cross-sectional view of the present invention;

[0016] Figure 4 This is an assembly diagram for the use of the present invention. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] like Figure 1-4 As shown, this invention discloses a pneumatic DBB double ball valve with an interlocking structure, including a valve body 10. The valve body 10 is provided with two switch balls 2 and one pressure relief ball 21. The switch balls 2 are provided with a synchronously rotating switch ball valve stem 31, and the pressure relief ball 21 is provided with a synchronously rotating pressure relief ball valve stem 32. The switch ball valve stem 31 and the pressure relief ball valve stem 32 rotate synchronously with the linkage mechanism 200. The switch balls 2 and the pressure relief ball 21 are respectively placed into a valve seat 1, a middle flange gasket 13 and a valve cover 14 from one side of the valve body 10.

[0019] The linkage mechanism 200 includes a first linkage 15, a second linkage 16, a third linkage 17, a fourth linkage 18, a fifth linkage 19, and a connecting rod 20. The connecting rod 20 rotates synchronously with the angular stroke cylinder 230. In this application, the rotation amplitude of the angular stroke cylinder 230 during operation is 90°.

[0020] Feasible. The fifth connecting rod 19 connects two switch ball valve stems 31. The second connecting rod 16 and the fifth connecting rod 19 are connected by a connecting pin 24 to form a parallelogram linkage mechanism. The third connecting rod 17 is connected to the second connecting rod 16. The connecting rod 20 passes through the center of the third connecting rod 17, thereby forming synchronous rotation of the two switch ball valves. The other end of the connecting rod 20 is connected to the angular stroke cylinder 230. The fourth connecting rod 18 is connected to the third connecting rod 17. The first connecting rod 15 is connected to the fourth connecting rod 18. The first connecting rod 15 is connected to the pressure relief ball valve stem 32, completing the synchronous rotation of the switch ball and the pressure relief ball. Countersunk holes are opened at the connecting rod connection parts to avoid mutual interference during the operation of the linkage mechanism. The connecting pin is fixed by the cotter pin 25 to prevent positional displacement caused by falling.

[0021] It is feasible to provide an inner recess for the connecting rod 18 to avoid interference with the connecting rod 20.

[0022] The portions of the switch ball valve stem 31 and the pressure relief ball valve stem 32 inside the valve body 10 are in contact with the valve body 10 through the thrust washer 4 and the packing 5. The thrust washer 4 is disposed around the inner ends of the switch ball valve stem 31 and the pressure relief ball valve stem 32, and the packing 5 is disposed around the main body of the switch ball valve stem 31 and the pressure relief ball valve stem 32.

[0023] The packing 5 is compressed by a packing gland 6, a disc spring 7, and a locking nut 8. The packing gland 6, disc spring 7, and locking nut 8 are fitted onto the switch ball valve stem 31 and the pressure relief ball valve stem 32. The packing gland 6 and disc spring 7 are located inside the locking nut 8. The packing gland 6 presses against the packing 5, and the locking nut 8 is threadedly connected to the switch ball valve stem 31 and the pressure relief ball valve stem 32, respectively. In this application, the packing 5 is further compressed by the packing gland 6, disc spring 7, and locking nut 8, preventing gaps caused by the valve stem contacting the valve body from affecting the valve body's sealing performance.

[0024] An anti-loosening block 9 is also provided on the outside of the locking nut 8, which is used to lock the locking nut 8.

[0025] It is feasible. The switch ball valve stem 31 and the pressure relief ball valve stem 32 have small openings with internal holes, in which springs 11 and steel balls 12 are sequentially installed. The valve cover is designed for butt welding, allowing connection to pipelines. The valve cover connection method can also be changed according to site requirements, including flange and thread.

[0026] To facilitate installation, countersunk holes are provided at the connecting parts of the connecting rods, and the connecting pins are fixed by cotter pins 25 when they are fixed.

[0027] Yes, it is feasible. The thrust gasket 4, packing 5, and middle flange gasket 13 are all made of PTFE, which can replace other sealing materials.

[0028] In this application, the valve is initially in a fully open position. When the angular stroke cylinder 230 operates, the operation is transmitted to the linkage mechanism via the connecting rod. The linkage mechanism transmits the operating angle synchronously to the switch ball and the pressure relief ball via the valve stem. At this time, the switch ball rotates to close, and the pressure relief ball rotates to open synchronously, releasing the pressure in the pipeline between the two switch balls. When the cylinder performs the reverse stroke operation, the switch ball rotates to open, and the pressure relief ball closes at the same time. All balls can be controlled to operate simultaneously by a single angular stroke cylinder, avoiding the possibility of human error.

[0029] When assembled and used, a cylinder bracket 201 is installed on the outer end of the linkage mechanism 200, and an angular stroke cylinder 230 is set on the upper end of the cylinder bracket 201. A signal feedback device 202 is also installed on the upper end of the angular stroke cylinder 230.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0031] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A pneumatic DBB double ball valve with an interlocking structure, comprising a valve body (10), characterized in that: The valve body (10) is provided with two switch balls (2) and one pressure relief ball (21). The switch balls (2) are provided with a synchronously rotating switch ball valve stem (31), and the pressure relief ball (21) is provided with a synchronously rotating pressure relief ball valve stem (32). The switch ball valve stem (31) and the pressure relief ball valve stem (32) rotate synchronously with the linkage mechanism (200). The switch balls (2) and the pressure relief ball (21) are respectively placed into the valve seat (1), the middle flange gasket (13) and the valve cover (14) from one side of the valve body (10). The linkage mechanism (200) includes a first linkage (15), a second linkage (16), a third linkage (17), a fourth linkage (18), a fifth linkage (19) and a connecting rod (20). The connecting rod (20) rotates synchronously with the angular stroke cylinder (230). The fifth connecting rod (19) connects two switch ball valve stems (31). The second connecting rod (16) is connected to the fifth connecting rod (19) via a connecting pin (24). The third connecting rod (17) is connected to the second connecting rod (16). The connecting rod (20) passes through the center of the third connecting rod (17). The other end of the connecting rod (20) is connected to the angular stroke cylinder (230). The fourth connecting rod (18) is connected to the third connecting rod (17). The first connecting rod (15) is connected to the fourth connecting rod (18). The first connecting rod (15) is connected to the pressure relief ball valve stem (32).

2. The pneumatic DBB double ball valve with interlocking structure according to claim 1, characterized in that: The fourth link (18) has an inner recess.

3. The pneumatic DBB double ball valve with interlocking structure according to claim 1, characterized in that: The portions of the switch ball valve stem (31) and the pressure relief ball valve stem (32) inside the valve body (10) are in contact with the valve body (10) through a thrust washer (4) and a packing (5). The thrust washer (4) is disposed around the inner ends of the switch ball valve stem (31) and the pressure relief ball valve stem (32), and the packing (5) is disposed around the main body of the switch ball valve stem (31) and the pressure relief ball valve stem (32).

4. A pneumatic DBB double ball valve with interlocking structure according to claim 3, characterized in that: The packing (5) is pressed by a packing gland (6), a disc spring (7) and a locking nut (8). The packing gland (6), the disc spring (7) and the locking nut (8) are fitted on the switch ball valve stem (31) and the pressure relief ball valve stem (32). The packing gland (6) and the disc spring (7) are located inside the locking nut (8). The packing gland (6) presses on the packing (5). The locking nut (8) is connected to the switch ball valve stem (31) and the pressure relief ball valve stem (32) respectively by threaded connection.

5. A pneumatic DBB double ball valve with interlocking structure according to claim 4, characterized in that: An anti-loosening block (9) is also provided on the outside of the locking nut (8), and the anti-loosening block (9) is used to lock the locking nut (8).

6. A pneumatic DBB double ball valve with interlocking structure according to claim 1, characterized in that: The switch ball valve stem (31) and the pressure relief ball valve stem (32) have small openings with holes inside, and springs (11) and steel balls (12) are arranged in sequence in the holes.

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