Ball valve capable of being opened more easily

Abstract

The ball valve comprises a valve body, a valve rod, an upper cover and a ball body, an upstream flow channel, a middle cavity and a downstream flow channel are formed in the valve body, the upper cover is installed at an opening in the upper end of the valve body, the valve rod penetrates through the upper cover and is connected with the ball body, and a valve seat box is arranged in each of the upstream flow channel and the downstream flow channel. A valve seat is mounted in the valve seat box; the pressure relief valve further comprises a pressure relief disc, a supporting step is arranged at an opening in the upper end of the valve body, the outer edge of the pressure relief disc is tightly pressed on the supporting step through the upper cover, two adjusting channels are symmetrically formed in the pressure relief disc, and two pressure relief channels used for enabling the two adjusting channels to be communicated with the upstream flow channel and the downstream flow channel respectively are formed in the valve body. An opening-closing assembly matched with the valve rod is arranged in the adjusting channel, and when the valve is closed, the valve rod firstly drives the opening-closing assembly to open the adjusting channel and then drives the ball to rotate. The pressure relief structure is additionally arranged, so that the pressure difference between upstream and downstream is reduced, and the opening operation of the valve is more labor-saving.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a ball valve with more labor-saving opening operation. 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] At present, ball valves on the market generally include 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 penetrates through the valve cover and extends into the valve body to be linked with the ball. A valve seat for sealing cooperation with the ball when the valve is closed is installed inside the valve body. However, under high-pressure working conditions, the pressure difference between the upstream and downstream of the ball valve is large, resulting in a large opening friction torque and difficult opening and closing. Therefore, it is necessary to improve the existing ball valve to make its opening operation more labor-saving under high-pressure working conditions. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a ball valve with more labor-saving opening operation. By adding a pressure relief structure, before the ball opens the flow channel, the pressure is first relieved through the pressure relief flow channel to reduce the pressure difference between the upstream and downstream, and then the ball is operated to open the flow channel, so that the opening friction torque of the ball valve becomes smaller and the opening operation of the valve is more labor-saving.

[0005] To achieve the above purpose, the utility model provides the following technical solution: a ball valve with more labor-saving opening operation, including a valve body, a valve stem, an upper cover and a ball. An upstream flow channel, a middle cavity and a downstream flow channel are sequentially communicated inside the valve body. The upper cover is installed at the upper end opening of the valve body. The valve stem penetrates through the upper cover and extends into the middle cavity of the valve body to be connected with the ball. A valve seat cavity is respectively arranged in the upstream flow channel and the downstream flow channel. A valve seat for sealing cooperation with the ball when the valve is closed is installed in the valve seat cavity. It also includes a pressure relief disc. A support step is arranged at the upper end opening of the valve body. The upper cover presses the outer edge part of the pressure relief disc on the support step. Two adjustment channels extending from the outer circular surface of the pressure relief disc to the lower end surface of the pressure relief disc are symmetrically arranged on the pressure relief disc. Two pressure relief channels for respectively communicating the two adjustment channels with the upstream flow channel and the downstream flow channel are arranged on the valve body. An opening and closing component matched with the valve stem is arranged in the adjustment channel. When the valve is closed, the valve stem first drives the opening and closing component to open the adjustment channel, and then drives the ball to rotate.

[0006] By adopting the above technical solution, when the valve is opened, the valve stem first drives the opening and closing assembly to open the regulating channel, so that the upstream channel is communicated with the downstream channel through the two pressure relief channels, the two regulating channels and the middle cavity for preliminary pressure relief to reduce the pressure difference between the upstream and downstream. Then, the valve stem drives the sphere to rotate to open the valve. At this time, the opening friction torque of the ball valve becomes smaller, and the opening operation of the valve is more labor-saving.

[0007] The present utility model is further configured such that a linkage protrusion is provided at the inner end of the valve stem, a linkage groove is provided at the upper end of the sphere, the linkage protrusion is disposed in the linkage groove, and a circumferential movement gap is provided between the linkage protrusion and the inner side of the linkage groove, so that the linkage protrusion has an idle state and a linkage state of driving the sphere to rotate by abutting against the inner side of the linkage groove. When the linkage protrusion idles, the opening and closing assembly opens the regulating channel.

[0008] By adopting the above technical solution, the function of first relieving pressure and then opening the valve can be realized.

[0009] The present utility model is further configured such that the regulating channel includes a guide groove provided on the inner circular surface of the pressure relief disk and extending radially, a first channel extending from the outer circular surface of the pressure relief disk to the inner end of the guide groove, and a second channel extending from the lower end surface of the pressure relief disk to the inner circular surface of the guide groove. The opening and closing assembly includes a pre-tightening spring and a regulating valve core. The pre-tightening spring and the regulating valve core are disposed in the guide groove, and the pre-tightening spring applies a pre-tightening force towards the valve stem direction to the regulating valve core. An inclined groove matching with the regulating valve core is provided on the outer periphery of the valve stem. When the regulating valve core is pushed into the inclined groove by the pre-tightening spring, the guide groove is communicated with the second channel. When the outer circular surface of the valve stem pushes the regulating valve core back into the guide groove, the guide groove is blocked from the second channel.

[0010] By adopting the above technical solution, an inclined groove is provided on the outer peripheral surface of the valve stem to realize the change of the radial distance on the outer peripheral surface of the valve stem, thereby realizing the movement control of the regulating valve core. The opening and closing assembly rotates with the valve stem to open or close, and the operation is very convenient.

[0011] The present utility model is further configured such that a plurality of positioning grooves are provided on the support step, and a plurality of positioning protrusions matching with the positioning grooves are provided on the pressure relief disk.

[0012] By adopting the above technical solution, not only the installation stability of the pressure relief disk can be improved, but also the precise docking of the pressure relief channel and the regulating channel can be realized, ensuring that the pressure relief channel can smoothly enter the regulating channel.

[0013] The present utility model is further configured such that a plurality of spring grooves are provided along the circumferential direction at one end of the valve seat away from the sphere, compression springs are provided in the spring grooves, and the outer ends of the compression springs abut against the end face of the valve seat cavity.

[0014] By adopting the above technical solution, the compression spring acts on the valve seat, prompting the valve seat to always tightly press against the sphere surface, ensuring the sealing performance between the two when the valve is closed.

[0015] The present utility model is further configured such that the pressure relief passage includes a valve body passage provided on the valve body and a valve seat passage provided on the valve seat. The valve body passage extends from the inner circular surface of the valve seat housing to the inner wall at the upper opening of the valve body. The valve seat passage includes an annular groove provided on the outer circular surface of the valve seat, a plurality of radial holes provided at the inner end of the annular groove and communicating with the corresponding spring grooves, and an axial hole extending from the inner end of the radial hole to the side of the valve seat close to the sphere. The annular groove communicates with the valve body passage.

[0016] By adopting the above technical solution, during the pressure relief operation, the upstream medium will enter the valve seat passage through the gap between the sphere and the valve seat, flushing the gap between the valve seat and the sphere and the spring grooves, achieving the effect of self-cleaning.

[0017] The present utility model is further configured such that a first O-ring for sealingly cooperating with the inner wall of the valve body is respectively installed at positions corresponding to the upper and lower sides of the adjustment passage on the outer circular surface of the pressure relief disc, and a second O-ring for sealingly cooperating with the inner circular surface of the valve seat housing is respectively provided at positions corresponding to both sides of the annular groove on the outer circular surface of the valve seat.

[0018] By adopting the above technical solution, the sealing performance of the cooperation of each part can be ensured, and the occurrence of medium leakage can be avoided. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the whole of the present utility model;

[0020] Figure 2 is Figure 1 an enlarged structural diagram of part A in

[0021] Figure 3 a schematic structural diagram of the cooperation between the valve stem and the sphere of the present utility model.

[0022] In the figure: 1, valve body; 2, valve stem; 3, upper cover; 4, sphere; 5, upstream flow channel; 6, middle cavity; 7, downstream flow channel; 8, valve seat housing; 9, valve seat; 10, pressure relief disc; 11, support step; 12, adjustment passage; 13, pressure relief passage; 14, opening and closing assembly; 15, linkage protrusion; 16, linkage groove; 17, moving gap; 18, guide groove; 19, first channel; 20, second channel; 21, pre-tightening spring; 22, regulating valve core; 23, inclined groove; 24, positioning groove; 25, positioning protrusion; 26, spring groove; 27, compression spring; 28, valve body passage; 29, valve seat passage; 30, annular groove; 31, radial hole; 32, axial hole; 33, first O-ring; 34, second O-ring. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to 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 creative efforts shall fall within the protection scope of the present utility model.

[0024] Embodiment: As shown in the attached Figures 1 to 3 ball valve with a more labor-saving opening operation, including a valve body 1, a valve stem 2, an upper cover 3 and a ball 4. The valve body 1 includes a middle body and valve covers bolted to both ends of the middle body. An upstream flow channel 5, a middle cavity 6 and a downstream flow channel 7 are sequentially communicated in the valve body 1. The upper cover 3 is installed at the upper opening of the valve body 1 by screws. The valve stem 2 passes through the upper cover 3 and extends into the middle cavity 6 of the valve body 1 to be connected with the ball 4. A valve seat housing 8 is respectively provided in the upstream flow channel 5 and the downstream flow channel 7. A valve seat 9 for forming a sealing fit with the ball 4 when the valve is closed is installed in the valve seat housing 8. A sealing ring is detachably installed on the valve seat 9 for abutting and sealing against the sealing surface of the ball 4. The ball valve further includes a pressure relief disc 10. A support step 11 is provided at the upper opening of the valve body 1. The upper cover 3 presses the outer edge portion of the pressure relief disc 10 against the support step 11. Two adjustment channels 12 extending from the outer circular surface of the pressure relief disc 10 to the lower end surface of the pressure relief disc 10 are symmetrically arranged on the pressure relief disc 10. Two pressure relief channels 13 for respectively communicating the two adjustment channels 12 with the upstream flow channel 5 and the downstream flow channel 7 are provided on the valve body 1. An opening and closing assembly 14 cooperating with the valve stem 2 is provided in the adjustment channel 12. When the valve is closed, the valve stem 2 first drives the opening and closing assembly 14 to open the adjustment channel 12, and then drives the ball 4 to rotate. When the valve is opened, the valve stem 2 first drives the opening and closing assembly 14 to open the adjustment channel 12, so that the upstream channel is communicated with the downstream channel through the two pressure relief channels 13, the two adjustment channels 12 and the middle cavity 6 for preliminary pressure relief to reduce the pressure difference between the upstream and downstream. Then, the valve stem 2 drives the ball 4 to rotate to open the valve. At this time, the opening friction torque of the ball valve becomes smaller, and the opening operation of the valve is more labor-saving.

[0025] As shown in the attached Figure 1 and the attached Figure 3As shown, a linkage protrusion 15 is provided at the inner end of the valve stem 2, and a linkage groove 16 is provided at the upper end of the sphere 4. The linkage protrusion 15 is arranged in the linkage groove 16, and a circumferential movement gap 17 is provided between the linkage protrusion 15 and the linkage groove 16, so that the linkage protrusion 15 has an idle state and a linkage state of driving the sphere 4 to rotate by abutting against the inner side of the linkage groove 16. When the linkage protrusion 15 idles, the opening and closing assembly 14 opens the regulating channel 12. This design can achieve the function of first relieving pressure and then opening the valve. In this embodiment, both the linkage protrusion 15 and the linkage groove 16 are square structures, and the area of the linkage groove 16 is larger than that of the linkage protrusion 15. When the corners of the linkage protrusion 15 abut against the inner wall of the linkage groove 16, the linkage protrusion 15 can drive the sphere 4 to rotate by further rotation.

[0026] As shown in the attached Figure 1 drawing and the attached Figure 2 As shown, the regulating channel 12 includes a guide groove 18 provided on the inner circular surface of the pressure relief disc 10 and extending radially, a first channel 19 extending from the outer circular surface of the pressure relief disc 10 to the inner end of the guide groove 18, and a second channel 20 extending from the lower end surface of the pressure relief disc 10 to the inner circular surface of the guide groove 18. The opening and closing assembly 14 includes a pre-tightening spring 21 and a regulating valve core 22. The pre-tightening spring 21 and the regulating valve core 22 are arranged in the guide groove 18, and the pre-tightening spring 21 applies a pre-tightening force towards the valve stem 2 to the regulating valve core 22. The regulating valve core 22 and the guide groove 18 are both cylindrical, and one end of the regulating valve core 22 close to the valve stem 2 has a dome structure. An inclined groove 23 is provided on the outer circumference of the valve stem 2 and is matched with the regulating valve core 22. When the regulating valve core 22 is pushed into the inclined groove 23 by the pre-tightening spring 21, the guide groove 18 is communicated with the second channel 20. When the outer circular surface of the valve stem 2 pushes the regulating valve core 22 back into the guide groove 18, the guide groove 18 is blocked from the second channel 20. By providing the inclined groove 23 on the outer circumferential surface of the valve stem 2, the change in the radial distance of the outer circumferential surface of the valve stem 2 is realized, so as to realize the movement control of the regulating valve core 22. The opening and closing assembly 14 rotates with the valve stem 2 to open or close, and the operation is very convenient.

[0027] As shown in the attached Figure 2 drawing, a plurality of positioning grooves 24 are provided on the support step 11, and a plurality of positioning protrusions 25 are provided on the pressure relief disc 10 and are fitted with the positioning grooves 24. This design can not only improve the installation stability of the pressure relief disc 10, but also realize the precise docking of the pressure relief channel 13 and the regulating channel 12, ensuring that the pressure relief channel 13 can smoothly enter the regulating channel 12.

[0028] As shown in the attached Figure 2As shown, at one end of the valve seat 9 away from the sphere 4, a plurality of spring grooves 26 are circumferentially arranged. A compression spring 27 is arranged in the spring groove 26, and the outer end of the compression spring 27 abuts against the end face of the valve seat housing 8. The compression spring 27 acts on the valve seat 9 to urge the valve seat 9 to always abut tightly against the surface of the sphere 4, ensuring the sealing performance between the two when the valve is closed.

[0029] As shown in the Figure 2 attachment, the pressure relief passage 13 includes a valve body passage 28 provided on the valve body 1 and a valve seat passage 29 provided on the valve seat 9. The valve body passage 28 extends from the inner circular surface of the valve seat housing 8 to the inner wall of the upper end opening of the valve body 1. The valve seat passage 29 includes an annular groove 30 provided on the outer circular surface of the valve seat 9, a plurality of radial holes 31 provided at the inner end of the annular groove 30 and communicating with the corresponding spring grooves 26, and an axial hole 32 extending from the inner end of the radial hole 31 to the side of the valve seat 9 close to the sphere 4. The annular groove 30 communicates with the valve body passage 28, and the axial hole 32 communicates with the upstream flow passage 5 (downstream flow passage 7). During the pressure relief operation, the upstream medium will enter the valve seat passage 29 through the gap between the sphere 4 and the valve seat 9, flushing the gap between the valve seat 9 and the sphere 4 and the spring grooves 26, achieving the effect of self-cleaning.

[0030] As shown in the Figure 2 attachment, a first O-ring 33 for sealing cooperation with the inner wall of the valve body 1 is respectively installed on the outer circular surface of the pressure relief disc 10 at positions corresponding to the upper and lower sides of the adjustment passage 12. A second O-ring 34 for sealing cooperation with the inner circular surface of the valve seat housing 8 is respectively provided on the outer circular surface of the valve seat 9 at positions corresponding to both sides of the annular groove 30. This design can ensure the sealing performance of the cooperation of each part and avoid the occurrence of medium leakage.

Claims

1. A ball valve with more labor-saving opening operation, comprising a valve body (1), a valve stem (2), an upper cover (3) and a ball (4), wherein the valve body (1) is provided with an upstream flow channel (5), a middle cavity (6) and a downstream flow channel (7) which are connected in sequence, the upper cover (3) is installed at the upper opening of the valve body (1), the valve stem (2) penetrates the upper cover (3) and extends into the middle cavity (6) of the valve body (1) to be connected with the ball (4), a valve seat box (8) is respectively provided in the upstream flow channel (5) and the downstream flow channel (7), and a valve seat (9) is installed in the valve seat box (8) for forming a sealing fit with the ball (4) when the valve is closed; the characteristics are as follows: The valve body (1) also includes a pressure relief disc (10). A support step (11) is provided at the upper opening of the valve body (1). The upper cover (3) presses the outer edge of the pressure relief disc (10) against the support step (11). The pressure relief disc (10) is symmetrically provided with two adjustment channels (12) extending from the outer circumferential surface of the pressure relief disc (10) to the lower end surface of the pressure relief disc (10). The valve body (1) is provided with two pressure relief channels (13) for connecting the two adjustment channels (12) with the upstream flow channel (5) and the downstream flow channel (7) respectively. The adjustment channel (12) is provided with an opening and closing component (14) that cooperates with the valve stem (2). When the valve is closed, the valve stem (2) first drives the opening and closing component (14) to open the adjustment channel (12), and then drives the ball (4) to rotate.

2. The ball valve with more labor-saving opening operation according to claim 1 is characterized in that: The inner end of the valve stem (2) is provided with a linkage protrusion (15), and the upper end of the ball (4) is provided with a linkage groove (16). The linkage protrusion (15) is arranged in the linkage groove (16), and a circumferential movable gap (17) is provided between the linkage protrusion (15) and the linkage groove (16), so that the linkage protrusion (15) has an idling state and a linkage state in which it abuts against the inner side of the linkage groove (16) to drive the ball (4) to rotate. When the linkage protrusion (15) is idling, the opening and closing component (14) opens the regulating channel (12).

3. The ball valve with more labor-saving opening operation according to claim 2 is characterized in that: The regulating passage (12) comprises a guide groove (18) arranged on the inner circumferential surface of the pressure relief disc (10) and extending in the radial direction, a first passage (19) extending from the outer circumferential surface of the pressure relief disc (10) to the inner end of the guide groove (18), and a second passage (20) extending from the lower end surface of the pressure relief disc (10) to the inner circumferential surface of the guide groove (18). The opening and closing assembly (14) comprises a preload spring (21) and a regulating valve core (22). The preload spring (21) and the regulating valve core (22) are arranged in the guide groove (18) and The preload spring (21) applies a preload force to the regulating valve core (22) in the direction of the valve stem (2); the outer periphery of the valve stem (2) is provided with an inclined groove (23) matching with the regulating valve core (22); when the regulating valve core (22) is pushed into the inclined groove (23) by the preload spring (21), the guide groove (18) is connected to the second channel (20); when the outer cylindrical surface of the valve stem (2) pushes the regulating valve core (22) back into the guide groove (18), the guide groove (18) is blocked from the second channel (20).

4. The ball valve with more labor-saving opening operation according to claim 1 is characterized in that: The support step (11) is provided with a plurality of positioning grooves (24), and the pressure relief disc (10) is provided with a plurality of positioning protrusions (25) that fit with the positioning grooves (24).

5. The ball valve with more labor-saving opening operation according to claim 1 is characterized in that: A plurality of spring grooves (26) are circumferentially arranged at one end of the valve seat (9) away from the ball (4), a compression spring (27) is arranged in the spring groove (26), and the outer end of the compression spring (27) is tightly pressed against the end surface of the valve seat box (8).

6. The ball valve with more labor-saving opening operation according to claim 5 is characterized in that: The pressure relief channel (13) includes a valve body channel (28) arranged on the valve body (1) and a valve seat channel (29) arranged on the valve seat (9); the valve body channel (28) extends from the inner circumferential surface of the valve seat box (8) to the inner wall of the upper end opening of the valve body (1); the valve seat channel (29) includes an annular groove (30) arranged on the outer circumferential surface of the valve seat (9), a plurality of radial holes (31) arranged at the inner end of the annular groove (30) and connected to the corresponding spring grooves (26), and an axial hole (32) extending from the inner end of the radial hole (31) to the side of the valve seat (9) close to the ball (4); the annular groove (30) is connected to the valve body channel (28).

7. The ball valve with more labor-saving opening operation according to claim 5 is characterized in that: A first O-ring (33) for sealing with the inner wall of the valve body (1) is installed at positions above and below the outer circumference of the pressure relief disc (10) corresponding to the regulating channel (12), and a second O-ring (34) for sealing with the inner circumference of the valve seat box (8) is installed at positions on both sides of the outer circumference of the valve seat (9) corresponding to the annular groove (30).

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