Axial flow flow regulating valve with balanced sight glass

Abstract

The utility model discloses a kind of axial flow type flow regulating valve with balance observation hole, it is related to valve technical field, including valve body, the transmission rod being vertically and perpendicularly arranged on the upper portion of valve body and the valve stem assembly being arranged in the inside of valve body and the linkage of transmission rod, it is characterized in that, the two sides of the horizontal direction of the valve body are equipped with the import and export being connected with valve body, transmission rod cavity is vertically and perpendicularly arranged in the upper portion of valve body, the transmission rod is arranged in transmission rod cavity, the valve body is equipped with the balance hole being connected with transmission rod cavity, pressure balance valve is installed in the balance hole.The utility model is arranged on the valve body balance hole being connected with transmission rod cavity and installs pressure balance valve on balance hole, can effectively balance the pressure inside and outside transmission rod cavity, make transmission rod cavity with external atmospheric pressure balance.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to an axial flow regulating valve with a balance observation hole. Background Technology

[0002] Axial flow control valves with balance observation holes are core control components in industrial pipeline systems and are widely used in petrochemical, power energy, water supply and drainage, and other fields. Their performance directly affects the stability and safety of fluid transportation. Axial flow valves typically employ a rigid seal design. After the medium enters through the inlet, the flow channel area gradually decreases, the medium velocity increases, and the medium pressure decreases. Then, guided by several guide holes, the medium flows out through the outlet. During this process, the pressure difference between the inside and outside of the valve body and the stress on the internal structure have a significant impact on the valve's regulation accuracy and service life.

[0003] Existing axial flow valves have shortcomings in their pressure balance design, failing to effectively balance the pressure difference generated by the flow of the medium inside and outside the valve body. Furthermore, existing axial flow valves lack visual adjustment methods to achieve pressure balance, preventing operators from observing the position of the internal transmission rod in real time. Additionally, when the seals in axial flow control valves with balance observation holes fail due to medium corrosion or wear, the medium can seep into the transmission rod cavity. However, traditional valves lack a leakage visualization channel, often resulting in leaks only being discovered after they have spread outside the valve body, increasing safety hazards in the pipeline system. Utility Model Content

[0004] To address the shortcomings of the existing technology, this utility model provides an axial flow regulating valve with a balance observation hole that can adjust the pressure inside and outside the valve to balance the pressure inside the transmission rod cavity with the external atmospheric pressure. To solve the above-mentioned technical problems, the present invention adopts the following technical solution: an axial flow regulating valve with a balance observation hole, comprising a valve body, a transmission rod vertically disposed in the upper part of the valve body, and a valve stem assembly disposed inside the valve body and linked with the transmission rod. The valve body has an inlet and an outlet on both sides in the horizontal direction that communicate with the valve body. A transmission rod cavity is opened through the upper part of the valve body, and the transmission rod is disposed in the transmission rod cavity. The valve body has a balance hole that communicates with the transmission rod cavity, and a pressure balancing valve is installed in the balance hole.

[0005] Furthermore, the valve body is divided into a first chamber and a second chamber by a separator and a valve stem assembly. The valve stem assembly includes a valve stem arranged horizontally and linked to a transmission rod, as well as a sleeve and a valve core located at the outlet of the valve body. The outer diameter of the valve core is adapted to the inner diameter of the sleeve, and the inner diameter of the sleeve is adapted to the inner diameter of the connected second chamber. The sleeve is provided with a guide hole connecting the first chamber and the second chamber. One end of the valve stem is connected to the valve core and the transmission rod drives the valve stem and valve core to move axially.

[0006] Furthermore, a pressure-stabilizing hole is provided on the valve core along the axial direction.

[0007] Furthermore, a front guide sleeve is installed in the middle of the partition body, and a rear guide sleeve is provided on the side near the valve body inlet. The inner diameters of the front guide sleeve and the rear guide sleeve are matched, and the valve stem is slidably installed in the front guide sleeve and the rear guide sleeve. The inner wall of the partition body is provided with a first limiting step, and the front guide sleeve is provided with a first limiting flange that extends radially to abut against the first limiting step. The inner wall of the front guide sleeve is provided with a second limiting step. The side of the rear guide sleeve near the front guide sleeve is recessed to form a third limiting step for abutting against the first limiting flange, and the side of the rear guide sleeve near the front guide sleeve extends axially to form a second limiting flange for abutting against the second limiting step. The rear guide sleeve presses the front guide sleeve tightly against the first limiting step.

[0008] Furthermore, a bushing is threaded onto the rear guide sleeve, and a sealing assembly is provided between the valve stem and the rear guide sleeve and the bushing.

[0009] Furthermore, the sealing assembly includes a first seal, a second seal, and a third seal arranged axially along the central cavity of the rear guide sleeve. The first seal is embedded in the inner wall of the rear guide sleeve, and the inner wall of the rear guide sleeve is provided with an annular step. The bushing extends axially on the side away from the rear guide sleeve to form a protruding extension section. The second seal is disposed between the rear guide sleeve and the extension section, and the third seal is embedded in the inner wall of the bushing.

[0010] Furthermore, a stop sleeve and a locking screw ring are provided at the connection between the valve body inlet and the sleeve. The stop sleeve abuts against the sleeve and the valve core, and the locking screw ring abuts against the stop sleeve, with the outer circumference of the locking screw ring and the inner circumference of the valve body being threadedly connected.

[0011] Furthermore, a valve seat ring is sealed and installed on the side of the separator located at the outlet, and one end of the guide sleeve extends into the valve seat ring.

[0012] Furthermore, sealing rings are provided between the outer wall of the front guide sleeve and the partition, between the front guide sleeve and the rear guide sleeve, between the sleeve and the valve core, between the valve seat ring and the partition, between the stop sleeve and the valve body, and between the sleeve and the valve core and the stop sleeve.

[0013] In summary, this utility model has the following beneficial effects: (1) By setting a balance hole on the valve body to connect the transmission rod cavity and installing a pressure balance valve on the balance hole, the pressure inside and outside the transmission rod cavity can be effectively balanced, so that the transmission rod cavity is balanced with the external atmospheric pressure, avoiding the increase of transmission rod movement resistance due to pressure difference, thereby reducing the driving force required to operate the transmission rod and improving the smoothness of valve operation; at the same time, it can be used as an assembly process hole. During assembly, the position of the transmission rod inside can be observed according to the pressure balance hole, and the assembly position can be adjusted.

[0014] (2) The separator and valve stem assembly work together to divide the inside of the valve body into two chambers. The guide hole on the sleeve can guide the medium to flow into the second chamber evenly. The valve core is adapted to the sleeve and forms a guide structure for the valve core. When the transmission rod drives the valve stem and valve core to move axially, the flow rate of the guide hole can be controlled, reducing fluid resistance and turbulence, and improving the accuracy of flow control.

[0015] (3) The front and rear guide sleeves serve as valve stem guide structures to provide stable sliding support for the valve stem; the matching of the limiting step and the limiting flange forms a reliable axial positioning structure to ensure accurate installation of the front and rear guide sleeves and avoid sealing failure or movement jamming caused by loose parts. A bushing is installed on the rear guide sleeve and a sealing structure is formed through the sealing assembly to prevent the medium from leaking from the valve stem movement gap. At the same time, the pressure balance hole is used to observe whether the medium enters the transmission rod chamber and leaks to the outside through the pressure balance valve, thereby determining whether the bushing is damaged.

[0016] (4) The bushing and valve stem adopt a multi-seal structure to seal the gaps in different parts, forming a multi-level sealing barrier, which can effectively meet the sealing requirements under complex working conditions such as high pressure and variable pressure, avoid media leakage, and improve the sealing reliability of the valve. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of an axial flow control valve with a balance observation port.

[0018] Figure 2 This is a schematic diagram of the front guide sleeve, rear guide sleeve, and valve stem.

[0019] Figure 3 for Figure 1 A magnified view of a section at point C.

[0020] The reference numerals in the attached drawings are explained as follows: 1. Valve body; 11. Transmission rod cavity; 12. First chamber; 13. Second chamber; 14. Balance hole; 15. Transmission rod; 2. Divider; 21. First limiting step; 22. Valve seat ring; 31. Valve stem; 32. Sleeve; 321. Guide hole; 33. Valve core; 331. Pressure stabilizing hole; 34. Front guide sleeve; 341. First limiting flange; 342. Second limiting step; 35. Rear guide sleeve; 351. Third limiting step; 352. Second limiting flange; 353. Annular step; 36. Bushing; 361. Extension section; 362. Seal 1; 363. Seal 2; 364. Seal 3; 41. Stop sleeve; 42. Locking thread ring. Detailed Implementation

[0021] The present invention will be further described in detail below with reference to the embodiments.

[0022] like Figure 1 As shown, this embodiment provides an axial flow regulating valve with a balance observation hole, including a valve body 1. The valve body 1 is divided into a first chamber 12 and a second chamber 13 by a separator 2 and a valve stem assembly. A transmission rod cavity 11 is provided through the upper part of the valve body 1. A transmission rod 15 is vertically arranged in the transmission rod cavity 11. A valve stem assembly linked with the transmission rod 15 is provided in the valve body 1. An inlet and an outlet are provided on both sides of the valve body 1 in the horizontal direction. A balance hole 14 is provided on the valve body 1 to connect with the transmission rod cavity 11, and a pressure balancing valve is installed on the balance hole 14. The pressure balancing valve is in a normally open state to balance the pressure inside and outside the regulating valve. At the same time, the pressure balancing structure can reduce the impact of the medium pressure on the seal of the transmission rod 15, extend the service life of the seal, and improve the overall reliability and stability of the valve.

[0023] The valve stem assembly includes a horizontally arranged valve stem 31 linked to the transmission rod 15, a sleeve 32 and a valve core 33 located at the outlet of the valve body 1. The outer diameter of the valve core 33 is matched with the inner diameter of the sleeve 32. Typically, the transmission system between the transmission rod 15 and the valve stem 31 uses gears and racks for rotational conversion. Specifically, gears are installed on the transmission rod 15, and racks are installed on the valve stem 31. When the actuator drives the transmission rod 15 to rotate, the meshing of the gears and racks converts the circular motion into the axial linear motion of the valve stem 31. The outer wall of the valve core 33 fits against the inner diameter of the sleeve 32. The inner diameter of the sleeve 32 is adapted to the inner diameter of the connected second chamber 13. The sleeve 32 and the separator 2 divide the interior of the valve body 1 into a first chamber 12 and a second chamber 13. The sleeve 32 is connected to one side of the separator 2 and is tightly connected by a limiting platform and a limiting flange to separate the first chamber 12 and the second chamber 13. The valve seat ring 22 is installed on the side of the separator 2 located at the outlet using bolts for sealing. One end of the front guide sleeve 34 extends into the valve seat ring 22. The valve stem 31 and the valve core 33 are fixed by bolts. The sleeve 32 is provided with a guide hole 321 that connects the first chamber 12 and the second chamber 13. One end of the valve stem 31 is connected to the valve core 33. The guide hole 321 on the sleeve 32 can guide the medium to flow evenly into the second chamber 13, reducing fluid resistance and turbulence, and improving the accuracy of flow control. The fitting and matching of the valve core 33 and the sleeve 32 form a reliable sealing and guiding structure. When the transmission rod 15 drives the valve stem 31 and the valve core 33 to move axially, the flow area of ​​the guide hole 321 can be precisely adjusted to achieve linear control of the flow rate, while improving the valve's sealing performance and erosion resistance. In addition, a pressure stabilizing hole 331 is provided on the valve core 33 along the axial direction, which allows the fluid pressure on both sides of the valve core 33 to be connected through the pressure stabilizing hole 331, balancing the pressure difference at both ends of the valve core 33, avoiding valve core 33 jamming or vibration due to pressure imbalance, thereby improving the smoothness of valve core 33 movement. At the same time, the pressure stabilizing hole 331 can reduce the impact force of high-speed fluid on the valve core 33, reduce the wear between the valve core 33 and the sleeve 32, and extend the service life of the valve, especially suitable for flow control under high pressure differential conditions.

[0024] like Figure 2As shown, a front guide sleeve 34 is installed in the middle of the partition body 2, and a rear guide sleeve 35 is fixedly connected to the partition body 2 by bolts on the side near the inlet of the valve body 1. The inner diameters of the front guide sleeve 34 and the rear guide sleeve 35 are matched. The valve stem 31 is slidably installed in the front guide sleeve 34 and the rear guide sleeve 35. The inner wall of the partition body 2 is provided with a first limiting step 21. The front guide sleeve 34 is provided with a first limiting flange 341 that extends radially to abut against the first limiting step 21. The inner wall of the front guide sleeve 34 is provided with a second limiting step 342. The side of the rear guide sleeve 35 near the front guide sleeve 34 is recessed to form a third limiting step 351 that abuts against the first limiting flange 341. The side of the rear guide sleeve 35 near the front guide sleeve 34 extends axially to form a second limiting flange 352 that abuts against the second limiting step 342. The rear guide sleeve 35 presses the front guide sleeve 34 against the first limiting step 21. The guiding structure of the front guide sleeve 34 and the rear guide sleeve 35 provides stable sliding support for the valve stem 31, reduces radial sway during the movement of the valve stem 31, and improves the guiding accuracy and movement smoothness of the valve stem 31; the cooperation between the limiting step and the limiting flange forms a reliable axial positioning structure, ensuring that the installation position of the front guide sleeve 34 and the rear guide sleeve 35 is accurate, and avoiding sealing failure or movement jamming caused by loose parts; the rear guide sleeve 35 presses the front guide sleeve 34 tightly onto the first limiting step 21 of the intermediate partition 2.

[0025] like Figure 3 As shown, a bushing 36 is threadedly connected to the rear guide sleeve 35, and a sealing assembly is provided between the valve stem 31 and the rear guide sleeve 35 and the bushing 36. By threading the bushing 36 onto the rear guide sleeve 35, a detachable sealing structure is formed, which facilitates the installation and replacement of the sealing assembly. The sealing assembly is located between the valve stem 31 and the rear guide sleeve 35 and the bushing 36, which can effectively prevent the medium from leaking from the movement gap of the valve stem 31 and improve the sealing performance of the valve.

[0026] Specifically, the sealing assembly includes a first seal 362, a second seal 363, and a third seal 364 arranged axially along the central cavity of the rear guide sleeve 35. The first seal 362 is embedded in the inner wall of the rear guide sleeve 35, and the inner wall of the rear guide sleeve 35 is provided with an annular step 353. The bushing 36 extends axially on the side away from the rear guide sleeve 35 to form a protruding extension section 361. The second seal 363 is disposed between the rear guide sleeve 35 and the extension section 361, and the third seal 364 is embedded in the inner wall of the bushing 36. This multi-seal structure, composed of three sealing elements, seals gaps in different areas, forming a multi-level sealing barrier. This effectively addresses sealing requirements under complex operating conditions such as high pressure and variable pressure, significantly improving the sealing reliability of the valve. Specifically, sealing element 362 is embedded in the inner wall of the rear guide sleeve 35 to seal the radial gap between the valve stem 31 and the rear guide sleeve 35; sealing element 363 is positioned between the rear guide sleeve 35 and the extension section 361 of the bushing 36 to seal the axial mating surface; and sealing element 364 is embedded in the inner wall of the bushing 36 to seal the radial gap between the valve stem 31 and the bushing 36. The multiple seals work together to reduce the load on individual sealing elements and extend the overall service life of the sealing assembly.

[0027] A stop sleeve 41 and a locking thread ring 42 are provided at the inlet of the valve body 1 where it connects with the sleeve 32. The stop sleeve 41 abuts against the sleeve 32 and the valve core 33, and the locking thread ring 42 abuts against the stop sleeve 41, with its outer circumference threadedly connected to the inner circumference of the valve body 1. The stop sleeve 41 axially positions the sleeve 32 and the valve core 33, preventing displacement under fluid impact or vibration, thus ensuring the stability of the valve stem assembly. The locking thread ring 42 is threadedly connected to the inner circumference of the valve body 1, pressing and fixing the stop sleeve 41.

[0028] To form a comprehensive sealing system, sealing rings are provided between the outer wall of the front guide sleeve 34 and the partition 2, between the front guide sleeve 34 and the rear guide sleeve 35, between the sleeve 32 and the valve core 33, between the valve seat ring 22 and the partition 2, between the stop sleeve 41 and the valve body 1, and between the sleeve 32 and the valve core 33 and the stop sleeve 41. This effectively prevents media leakage from the connection gaps between different components, meeting the requirements of high pressure and high sealing performance. Appropriate sealing rings are selected based on the structural characteristics and stress conditions of different parts. The sealing rings not only improve the valve's sealing performance but also reduce the erosion and corrosion of the component connection surfaces by the media, extending the valve's service life and ensuring that the valve maintains a reliable sealing state during long-term operation.

[0029] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An axial flow regulating valve with a balance observation hole, comprising a valve body (1), a transmission rod (15) vertically extending through the upper part of the valve body (1), and a valve stem assembly disposed inside the valve body (1) and linked to the transmission rod (15), characterized in that, The valve body (1) has an inlet and an outlet on both sides in the horizontal direction. A transmission rod cavity (11) is opened through the upper part of the valve body (1). The transmission rod (15) is set in the transmission rod cavity (11). A balance hole (14) is provided on the valve body (1) to connect with the transmission rod cavity (11). A pressure balancing valve is installed in the balance hole (14).

2. The axial flow regulating valve with a balance observation hole according to claim 1, characterized in that, The valve body (1) is divided into a first chamber (12) and a second chamber (13) by a partition (2) and a valve stem assembly. The valve stem assembly includes a valve stem (31) arranged horizontally and linked with a transmission rod (15), a sleeve (32) and a valve core (33) located at the outlet of the valve body (1). The outer diameter of the valve core (33) is adapted to the inner diameter of the sleeve (32), and the inner diameter of the sleeve (32) is adapted to the inner diameter of the connected second chamber (13). The sleeve (32) is provided with a guide hole (321) connecting the first chamber (12) and the second chamber (13). One end of the valve stem (31) is connected to the valve core (33) and the transmission rod (15) drives the valve stem (31) and the valve core (33) to move axially.

3. The axial flow regulating valve with a balance observation hole according to claim 2, characterized in that, The valve core (33) has a pressure stabilizing hole (331) along the axial direction.

4. The axial flow regulating valve with a balance observation hole according to claim 2, characterized in that, A front guide sleeve (34) is installed in the middle of the partition (2), and a rear guide sleeve (35) is provided on the side near the inlet of the valve body (1). The inner diameters of the front guide sleeve (34) and the rear guide sleeve (35) are matched. The valve stem (31) is slidably installed in the front guide sleeve (34) and the rear guide sleeve (35). A first limiting step (21) is provided on the inner wall of the partition (2), and a first limiting flange (341) is provided on the front guide sleeve (34) for radially extending and abutting against the first limiting step (21). The inner wall of the front guide sleeve (34) is provided with a second limiting step (342). The rear guide sleeve (35) is recessed on the side near the front guide sleeve (34) to form a third limiting step (351) for abutting against the first limiting flange (341). The side of the rear guide sleeve (35) near the front guide sleeve (34) extends axially to form a second limiting flange (352) for abutting against the second limiting step (342). The rear guide sleeve (35) presses the front guide sleeve (34) against the first limiting step (21).

5. The axial flow regulating valve with a balance observation hole according to claim 4, characterized in that, A bushing (36) is threaded onto the rear guide sleeve (35), and a sealing assembly is provided between the valve stem (31) and the rear guide sleeve (35) and the bushing (36).

6. The axial flow regulating valve with a balance observation hole according to claim 5, characterized in that, The sealing assembly includes a first seal (362), a second seal (363), and a third seal (364) arranged axially along the central cavity of the rear guide sleeve (35). The first seal (362) is embedded in the inner wall of the rear guide sleeve (35), and the inner wall of the rear guide sleeve (35) is provided with an annular step (353). The bushing (36) extends axially on the side away from the rear guide sleeve (35) to form a protruding extension section (361). The second seal (363) is located between the rear guide sleeve (35) and the extension section (361). The third seal (364) is embedded in the inner wall of the bushing (36).

7. The axial flow regulating valve with a balance observation hole according to claim 6, characterized in that, A stop sleeve (41) and a locking thread ring (42) are provided at the connection between the inlet of the valve body (1) and the sleeve (32). The stop sleeve (41) abuts against the sleeve (32) and the valve core (33). The locking thread ring (42) abuts against the stop sleeve (41) and the outer circumference of the locking thread ring (42) is threadedly connected to the inner circumference of the valve body (1).

8. The axial flow regulating valve with a balance observation hole according to claim 7, characterized in that, The separator (2) is sealed with a valve seat ring (22) on the side of the outlet, and one end of the guide sleeve (34) extends into the valve seat ring (22).

9. The axial flow regulating valve with a balance observation hole according to claim 8, characterized in that, Sealing rings are provided between the outer wall of the front guide sleeve (34) and the partition (2), between the front guide sleeve (34) and the rear guide sleeve (35), between the sleeve (32) and the valve core (33), between the valve seat ring (22) and the partition (2), between the stop sleeve (41) and the valve body (1), and between the sleeve (32) and the valve core (33) and the stop sleeve (41).

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