Self-pressure-relief protective ball valve

Abstract

The utility model discloses a self-pressure-relief protective ball valve which comprises a valve body, a ball body, a valve cover and a valve rod. The pressure relief valve further comprises a pressure relief element, a connector and a pressure relief pipeline, a pressure relief hole is formed in the valve body, the pressure relief element comprises a pressure relief shell, a check ball, a pre-tightening spring and a spring seat, one end of the pressure relief shell is installed on the pressure relief hole, and the other end of the pressure relief shell is connected with the pressure relief pipeline through the connector. A first channel, a second channel, a third channel and a fourth channel which are communicated with one another and are sequentially increased in diameter are sequentially arranged in the pressure relief shell in the axial direction, a limiting step is formed between the first channel and the second channel, the spring seat is arranged in the third channel, and a plurality of first via holes are formed in the spring seat in the axial direction in a penetrating mode. And the pre-tightening spring is arranged between the spring seat and the non-return ball. When an upstream medium reaches a set pressure, the medium can be discharged to an external designated position for pressure relief, so that the safety is higher, and the damage of high pressure to internal elements of the ball valve can be remarkably reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a self-relieving protection ball valve. Background Art

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

[0003] Generally, a ball valve on the market includes a valve body, a valve cover, a valve stem and a ball. The valve cover is installed on the upper part of the valve body. The valve stem passes through the valve cover and extends into the valve body to be linked with the ball. A valve seat for forming a sealing fit with the ball when the valve is closed is installed inside the valve body. In a high-temperature and high-pressure environment, when the ball valve is in a closed state, if the upstream medium pressure is too high (such as the pressure increases due to liquid gasification), it not only has certain potential safety hazards, but also can damage the internal components of the ball valve and shorten the service life of the ball valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a self-relieving protection ball valve. When the upstream medium reaches the set pressure, the utility model can discharge the medium to a specified external position for pressure relief, which not only has higher safety, but also can significantly reduce the damage caused by high pressure to the internal components of the ball valve and extend the service life of the ball valve.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A self-relieving protection ball valve, including a valve body, a ball, a valve cover and a valve stem. An inlet flow channel, a middle cavity and an outlet flow channel are sequentially communicated in the valve body. The ball is arranged in the middle cavity of the valve body. The valve cover is installed at the upper end of the valve body. The valve stem passes through the valve cover and the inner end of the valve stem is linked with the ball. A valve seat for forming a sealing fit with the ball when the valve is closed is respectively installed at positions on both sides of the ball in the middle cavity of the valve body; It further includes a pressure relief element, a joint and a pressure relief pipeline. A pressure relief hole communicating the inlet flow channel with the outside is opened on the valve body. The pressure relief element includes a pressure relief housing, a check ball, a pre-tightening spring and a spring seat. One end of the pressure relief housing is installed on the pressure relief hole, and the other end of the pressure relief housing is connected with the pressure relief pipeline through the joint. A first channel, a second channel, a third channel and a fourth channel which are mutually communicated and have gradually increasing diameters are sequentially arranged along the axial direction in the pressure relief housing. A limiting step is formed between the first channel and the second channel. The spring seat is arranged in the third channel. A plurality of first through holes are axially penetrated through the spring seat. The pre-tightening spring is arranged between the spring seat and the check ball to press the check ball against the limiting step. The diameter of the check ball is smaller than the diameter of the second channel.

[0006] By adopting the above technical solution, when the upstream medium pressure is too high, the medium overcomes the gravity of the check ball and the spring force of the preloading spring, pushes the check ball away, and the upstream medium passes through the pressure relief element and is discharged to the outside through the pressure relief pipeline or collected at a specific location. This not only has higher safety, but also can significantly reduce the damage caused by high pressure to the internal components of the ball valve and extend the service life of the ball valve.

[0007] The present utility model is further configured such that the pressure relief element further includes an adjusting disk, the adjusting disk is threadedly connected in the fourth channel, and when the adjusting disk is rotated, the adjusting disk can axially move. A plurality of second through holes are axially penetrated through the adjusting disk. The spring seat is axially slidably disposed in the third channel, and the adjusting disk is provided with a pressing protrusion for abutting against the spring seat.

[0008] By adopting the above technical solution, by rotating the adjusting disk to push the spring seat to axially move, the compression amount of the preloading spring can be changed, so as to realize the adjustment of the opening pressure of the pressure relief element, which can be flexibly set according to actual needs.

[0009] The present utility model is further configured such that a positioning groove is provided at one end of the spring seat close to the sphere, and one end of the preloading spring away from the sphere is embedded in the positioning groove.

[0010] By adopting the above technical solution, the preloading spring can be positioned, making its movement process more stable.

[0011] The present utility model is further configured such that a plurality of axially extending guiding grooves are provided in the third channel, and a plurality of guiding protrusions are provided on the outer periphery of the spring seat and are matched with the guiding grooves.

[0012] By adopting the above technical solution, circumferential limitation of the spring seat can be achieved, so that it can only axially slide, avoiding torsion of the preloading spring and playing a role in protecting the preloading spring.

[0013] The present utility model is further configured such that an internal hexagonal groove is provided at one end of the adjusting disk away from the spring seat.

[0014] By adopting the above technical solution, the adjusting disk can be rotated by operating with a hexagonal wrench, making the rotation operation of the adjusting disk easier and more convenient.

[0015] The present utility model is further configured such that an installation groove is provided at a position of the valve body corresponding to the outer end of the pressure relief hole, a screw sleeve is welded in the installation groove, and one end of the pressure relief housing away from the pressure relief pipeline is threadedly connected to the screw sleeve.

[0016] By adopting the above technical solution, avoiding opening screw holes on the valve body surface is more conducive to processing.

[0017] The present utility model is further configured such that a limiting flange is provided on the outer periphery of the pressure relief housing. When the end of the pressure relief housing away from the pressure relief pipe is screwed tightly into the screw sleeve, the limiting flange abuts against the outer end of the screw sleeve, and a sealing gasket for forming a sealing fit with the outer end of the screw sleeve is installed on the limiting flange.

[0018] By adopting the above technical solution, good sealing performance of the pressure relief housing installation can be ensured.

[0019] The present utility model is further configured such that the joint includes a hexagonal operation portion in the middle and a first threaded section and a second threaded section at both ends of the hexagonal operation portion. The first threaded section is threadedly connected to the fourth channel of the pressure relief housing, and the second threaded section is threadedly connected to the pressure relief pipe.

[0020] By adopting the above technical solution, the connection structure is simple and reliable, and disassembly and assembly are very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0022] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0023] Figure 3 is a schematic structural diagram of the spring seat of the present utility model;

[0024] Figure 4 is a schematic structural diagram of the adjusting disk of the present utility model.

[0025] In the figure: 1, valve body; 2, sphere; 3, valve cover; 4, valve stem; 5, inlet flow channel; 6, middle cavity; 7, outlet flow channel; 8, valve seat; 9, pressure relief element; 10, joint; 11, pressure relief pipe; 12, pressure relief hole; 13, pressure relief housing; 14, check ball; 15, preloading spring; 16, spring seat; 17, first channel; 18, second channel; 19, third channel; 20, fourth channel; 21, limiting step; 22, first through hole; 23, adjusting disk; 24, second through hole; 25, extrusion protrusion; 26, positioning groove; 27, guiding groove; 28, guiding protrusion; 29, internal hexagonal groove; 30, installation groove; 31, screw sleeve; 32, limiting flange; 33, sealing gasket; 34, hexagonal operation portion; 35, first threaded section; 36, second threaded section. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0027] Embodiment: As shown in the Figures 1 to 4 self-relieving protection ball valve, which includes a valve body 1, a ball 2, a valve cover 3 and a valve stem 4. An inlet flow channel 5, a middle cavity 6 and an outlet flow channel 7 are sequentially communicated in the valve body 1. The ball 2 is arranged in the middle cavity 6 of the valve body 1. The valve cover 3 is installed at the upper end of the valve body 1. The valve stem 4 penetrates through the valve cover 3 and the inner end of the valve stem 4 is linked with the ball 2. A valve seat 8 for forming a sealing fit with the ball 2 when the valve is closed is respectively installed at positions on both sides of the ball 2 in the middle cavity 6 of the valve body 1. The ball valve further includes a pressure relief element 9, a joint 10 and a pressure relief pipeline 11. A pressure relief hole 12 communicating the inlet flow channel 5 with the outside is opened on the valve body 1. The pressure relief element 9 includes a pressure relief housing 13, a check ball 14, a pre-tightening spring 15 and a spring seat 16. One end of the pressure relief housing 13 is installed on the pressure relief hole 12, and the other end of the pressure relief housing 13 is connected to the pressure relief pipeline 11 through the joint 10. A first channel 17, a second channel 18, a third channel 19 and a fourth channel 20 which are communicated with each other and have gradually increasing diameters are sequentially arranged along the axial direction in the pressure relief housing 13. A limiting step 21 is formed between the first channel 17 and the second channel 18. The spring seat 16 is arranged in the third channel 19. A plurality of first through holes 22 are axially penetrated through the spring seat 16. The pre-tightening spring 15 is arranged between the spring seat 16 and the check ball 14 for pressing the check ball 14 against the limiting step 21. The diameter of the check ball 14 is smaller than the diameter of the second channel 18. When the upstream medium pressure is too high, the medium overcomes the gravity of the check ball 14 and the spring force of the pre-tightening spring 15, and pushes the check ball 14 away. After the check ball 14 is pushed away, the medium will pass through the gap between the check ball 14 and the second channel 18. The upstream medium passes through the pressure relief element 9 and is discharged to the outside or collected at a specific location through the pressure relief pipeline 11. It not only has higher safety, but also can significantly reduce the damage caused by high pressure to the internal components of the ball valve and extend the service life of the ball valve.

[0028] As shown in the Figure 2 and shown in the Figure 4As shown, the pressure relief element 9 further includes an adjustment disc 23, which is threadedly connected in the fourth channel 20. When the adjustment disc 23 is rotated, the adjustment disc 23 can move axially. That is, the fourth channel 20 has internal threads, and the outer periphery of the adjustment disc 23 has external threads. A plurality of second through holes 24 are axially formed through the adjustment disc 23. The spring seat 16 is slidably arranged axially in the third channel 19. An extrusion protrusion 25 for tightly abutting against the spring seat 16 is integrally provided on the adjustment disc 23. By rotating the adjustment disc 23 to push the spring seat 16 to move axially, the compression amount of the pre-tightening spring 15 can be changed, so as to realize the adjustment of the opening pressure of the pressure relief element 9, which can be flexibly set according to actual needs.

[0029] As shown in the Figure 2 and Figure 3 As shown in the figure, a positioning groove 26 is provided at one end of the spring seat 16 close to the sphere 2, and one end of the pre-tightening spring 15 away from the sphere 2 is embedded in the positioning groove 26. This design can position the pre-tightening spring 15 to make its movement process more stable.

[0030] As shown in the Figure 2 and Figure 3 As shown in the figure, a plurality of axially extending guide grooves 27 are provided in the third channel 19, and a plurality of guide protrusions 28 cooperating with the guide grooves 27 are provided on the outer periphery of the spring seat 16. This design can circumferentially limit the spring seat 16 so that it can only slide axially, avoiding the torsion of the pre-tightening spring 15 and playing a role in protecting the pre-tightening spring 15.

[0031] As shown in the Figure 2 and Figure 4 As shown in the figure, an internal hexagonal groove 29 is provided at one end of the adjustment disc 23 away from the spring seat 16. The adjustment disc 23 can be rotated by using a hexagonal wrench, making the rotation operation of the adjustment disc 23 easier and more convenient.

[0032] As shown in the Figure 2 As shown in the figure, an installation groove 30 is provided at the position of the valve body 1 corresponding to the outer end of the pressure relief hole 12. A screw sleeve 31 is welded in the installation groove 30. The inner periphery of the screw sleeve 31 has internal threads, and one end of the pressure relief outer shell 13 away from the pressure relief pipeline 11 is threadedly connected in the screw sleeve 31. This design can avoid opening screw holes on the surface of the valve body 1, which is more conducive to processing.

[0033] As shown in the Figure 2 As shown in the figure, a limit flange 32 is provided on the outer periphery of the pressure relief outer shell 13. When one end of the pressure relief outer shell 13 away from the pressure relief pipeline 11 is screwed tightly into the screw sleeve 31, the limit flange 32 abuts tightly against the outer end of the screw sleeve 31, and a sealing gasket 33 for forming a sealing fit with the outer end of the screw sleeve 31 is installed on the limit flange 32. This design can ensure good sealing performance of the installation of the pressure relief outer shell 13.

[0034] As shown in the Figure 2 accompanying drawings, the joint 10 includes a hexagonal operating portion 34 located in the middle and a first threaded section 35 and a second threaded section 36 located at both ends of the hexagonal operating portion 34. External threads are provided on the outer circumferences of the first threaded section 35 and the second threaded section 36. The first threaded section 35 is threadedly connected to the fourth channel 20 of the pressure relief housing 13, and the second threaded section 36 is threadedly connected to the pressure relief pipe 11. This design has a simple and reliable connection structure and is very convenient for disassembly and assembly.

Claims

1. A self-relieving protective ball valve, comprising a valve body (1), a ball (2), a valve cover (3) and a valve stem (4), wherein the valve body (1) has an inlet flow channel (5), a middle cavity (6) and an outlet flow channel (7) which are connected in sequence, the ball (2) being arranged in the middle cavity (6) of the valve body (1), the valve cover (3) being mounted on the upper end of the valve body (1), the valve stem (4) penetrating the valve cover (3) and the inner end of the valve stem (4) being linked to the ball (2), and a valve seat (8) for forming a sealing fit with the ball (2) when the valve is closed is respectively mounted at positions corresponding to both sides of the ball (2) in the middle cavity (6) of the valve body (1); characterized in that: The valve body (1) further comprises a pressure relief element (9), a joint (10) and a pressure relief pipe (11); the valve body (1) is provided with a pressure relief hole (12) for connecting the inlet flow channel (5) with the outside; the pressure relief element (9) comprises a pressure relief shell (13), a check ball (14), a preload spring (15) and a spring seat (16); one end of the pressure relief shell (13) is mounted on the pressure relief hole (12); the other end of the pressure relief shell (13) is connected to the pressure relief pipe (11) via the joint (10); and the pressure relief shell (13) is provided with two mutually connected and successively increasing diameters in sequence along the axial direction. A first channel (17), a second channel (18), a third channel (19) and a fourth channel (20) are provided, a limiting step (21) is formed between the first channel (17) and the second channel (18), the spring seat (16) is arranged in the third channel (19), a plurality of first through holes (22) are axially penetrated on the spring seat (16), the preload spring (15) is arranged between the spring seat (16) and the check ball (14) for pressing the check ball (14) against the limiting step (21), and the diameter of the check ball (14) is smaller than the diameter of the second channel (18).

2. The self-pressure relief protection ball valve according to claim 1 is characterized in that: The pressure relief element (9) further comprises an adjusting disk (23), wherein the adjusting disk (23) is threadedly connected to the fourth channel (20), and when the adjusting disk (23) is rotated, the adjusting disk (23) can move axially, and a plurality of second through holes (24) are axially provided on the adjusting disk (23), and the spring seat (16) can be axially slidably arranged in the third channel (19), and the adjusting disk (23) is provided with an extrusion protrusion (25) for abutting against the spring seat (16).

3. The self-pressure relief protection ball valve according to claim 2 is characterized in that: A positioning groove (26) is provided at one end of the spring seat (16) close to the sphere (2), and an end of the preload spring (15) away from the sphere (2) is embedded in the positioning groove (26).

4. The self-pressure relief protection ball valve according to claim 3 is characterized in that: A plurality of guide grooves (27) extending in the axial direction are arranged in the third channel (19), and a plurality of guide protrusions (28) matching with the guide grooves (27) are arranged on the outer periphery of the spring seat (16).

5. The self-pressure relief protection ball valve according to claim 2 is characterized in that: An end of the adjustment disk (23) away from the spring seat (16) is provided with a hexagonal socket (29).

6. The self-pressure relief protection ball valve according to claim 1 is characterized in that: The valve body (1) is provided with a mounting groove (30) at a position corresponding to the outer end of the pressure relief hole (12), a threaded sleeve (31) is welded in the mounting groove (30), and one end of the pressure relief housing (13) away from the pressure relief pipe (11) is threadedly connected in the threaded sleeve (31).

7. The self-pressure relief protection ball valve according to claim 6 is characterized in that: A limiting flange (32) is provided on the outer periphery of the pressure relief housing (13). When the end of the pressure relief housing (13) away from the pressure relief pipe (11) is screwed into the screw sleeve (31), the limiting flange (32) is tightly abutted against the outer end of the screw sleeve (31), and a sealing gasket (33) is installed on the limiting flange (32) for forming a sealing fit with the outer end of the screw sleeve (31).

8. The self-pressure relief protection ball valve according to claim 1 is characterized in that: The joint (10) comprises a hexagonal operating portion (34) located in the middle, and a first threaded section (35) and a second threaded section (36) located at both ends of the hexagonal operating portion (34), wherein the first threaded section (35) is threadedly connected to a fourth channel (20) of the pressure relief housing (13), and the second threaded section (36) is threadedly connected to a pressure relief pipe (11).

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