A pilot operated control valve

Abstract

The present application belongs to the technical field of regulating valve, and provides a pilot regulating valve. The present application comprises a valve body, a sleeve, a valve plug, a pressure disc and a connecting disc, and the valve body, the sleeve, the valve plug, the pressure disc and the connecting disc are formed with a first cavity, wherein the side wall of the sleeve is provided with a throttling hole; the valve plug is provided with a first medium channel communicated with the throttling hole; the pressure disc is connected to the valve plug and is provided with a second medium channel communicated with the first cavity; the connecting disc is located between the pressure disc and the valve plug to form an accommodating cavity and is connected with a driving member, and is in contact with or separated from the pressure disc under the action of the driving member, and when the connecting disc is separated from the pressure disc, a third medium channel is formed, and the medium enters the first cavity through the first medium channel, the third medium channel and the second medium channel in sequence. The present application solves the problem that the medium in the first cavity cannot quickly form back pressure on the valve plug, and has simple structure and low modification cost.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and in particular to a pilot-operated control valve. Background Technology

[0002] Control valves have a wide range of applications, widely used in petroleum, chemical, power, metallurgy, and steel industries. In existing control valve structures, before the valve opens, the medium enters the cavity above the valve plug through the gap between the sleeve and the valve plug. Because the gap is very small, it takes a long time for the medium to create back pressure on the valve plug to provide auxiliary sealing. Increasing the gap between the sleeve and the valve plug would prevent the medium in the cavity from releasing pressure quickly after the valve opens, causing valve oscillation and affecting the accuracy of flow regulation. Therefore, a new technical solution is needed to address these problems. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a pilot-operated regulating valve to solve the problem that the medium entering the cavity above the valve plug cannot quickly form back pressure on the valve plug in the prior art.

[0004] To achieve the above and other related objectives, the present invention provides a pilot-operated regulating valve, specifically configured as follows: It includes a valve body, a sleeve disposed within the valve body, and a valve plug, a pressure plate, and a connecting plate disposed within the sleeve. The valve body, sleeve, valve plug, pressure plate, and connecting plate form a first cavity. The valve body has a medium inlet and a medium outlet. A throttling orifice is provided on the side wall of the sleeve, through which the medium enters the sleeve from the medium inlet of the valve body. The valve plug has a first medium channel communicating with the throttling orifice. The pressure plate is connected to the valve plug, and a receiving cavity is formed between the pressure plate and the valve plug. The pressure plate has a second medium channel communicating with the first cavity. The connecting plate is located within the receiving cavity and connected to a driving member, and under the action of the driving member, it is either in contact with or separates from the pressure plate. When the connecting plate separates from the pressure plate, a third medium channel is formed, which communicates with both the first and second medium channels. The medium enters the first cavity sequentially through the first, third, and second medium channels.

[0005] Optionally, the valve plug is further provided with a fourth medium channel, the inner wall of the fourth medium channel is provided with a first step and a second step, the second step is provided below the first step, the connecting plate is embedded in the first step, and the pressure plate is pressed on the first step.

[0006] Optionally, the pressure plate is provided with an anti-rotation component, and the pressure plate and the connecting plate are connected through the anti-rotation component. The connecting plate moves along the axis of the anti-rotation component to fit or separate from the pressure plate.

[0007] Optionally, a notch is provided on the circumferential sidewall of the connecting plate near the pressure plate, and the notch forms a passage with the first medium channel before the connecting plate and the pressure plate are closed.

[0008] Optionally, it also includes a valve core, with the connecting disc sleeved on the valve core, and the connecting disc moving synchronously with the valve core.

[0009] Optionally, the rear end of the valve core passes through the second medium channel and the first cavity and is connected to the driving member. The driving member drives the front end of the valve core to close or separate from the fourth medium channel. When the front end of the valve core separates from the fourth medium channel, the medium flows out of the valve body from the medium outlet of the valve body through the fourth medium channel.

[0010] Optionally, the connecting plate is provided with a fifth medium channel, which communicates with the second stepped section. An elastic element is provided in the second stepped section, and the elastic element is sleeved on the front end of the valve core.

[0011] Optionally, the valve plug is provided with a first sealing chamfer at the end opposite to the pressure plate, and the inner wall of the sleeve is provided with a second sealing chamfer that cooperates with the first sealing chamfer; when the first sealing chamfer and the second sealing chamfer are separated, the medium flows out of the valve body from the medium outlet of the valve body through the gap between the first sealing chamfer and the second sealing chamfer.

[0012] Optionally, the outer wall of the valve plug is provided with a first groove along its circumference, and the first groove corresponds to the throttling orifice.

[0013] Optionally, a second groove is provided on the outer wall of the valve plug near the pressure plate, and a metal sealing ring is provided in the second groove.

[0014] As described above, the pilot-operated regulating valve of the present invention has the following beneficial effects:

[0015] By setting a throttling orifice on the sleeve, a first medium channel on the valve plug, a second medium channel on the pressure plate, and a third medium channel formed by separating the connecting plate from the pressure plate, the throttling orifice, the first medium channel, the second medium channel, and the third medium channel are interconnected. This allows the medium to enter the first cavity rapidly through the throttling orifice, the first medium channel, the third medium channel, and the second medium channel in sequence, solving the problem that the medium in the first cavity cannot quickly generate back pressure on the valve plug. Furthermore, the structure is simple and the modification cost is low. Attached Figure Description

[0016] Figure 1 The diagram shows a schematic of the pilot-operated regulating valve in the closed state according to an embodiment of the present invention.

[0017] Figure 2 The diagram shows a schematic of the pilot-operated regulating valve in the open state according to an embodiment of the present invention.

[0018] Figure 3 Displayed as Figure 1 Enlarged diagram of A in the middle;

[0019] Figure 4 The diagram shown is a structural schematic of the valve plug according to an embodiment of the present invention.

[0020] Figure 5 The diagram shown is a structural schematic of the valve core according to an embodiment of the present invention.

[0021] Part Number Explanation

[0022] 1-Valve body; 11-Medium inlet; 12-Medium outlet;

[0023] 2-Sleeve; 21-Throttle orifice; 22-Second sealing chamfer;

[0024] 3-Valve plug; 31-First medium passage; 32-First groove; 33-Second groove; 34-Metal sealing ring; 35-First sealing chamfer; 36-Fourth medium passage; 37-First stepped section; 38-Second stepped section;

[0025] 4-Pressure plate; 41-Second medium channel; 42-Third medium channel; 43-Anti-rotation component;

[0026] 5-Connecting plate; 51-Fifth media channel; 52-Notch;

[0027] 6-First cavity;

[0028] 7-Valve core;

[0029] 8-Second cavity;

[0030] 9-Elastic element. Detailed Implementation

[0031] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0032] Please see Figures 1 to 5It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of the present invention. Therefore, the illustrations only show components relevant to the present invention and are not drawn according to the actual number, shape, and size of components in implementation. In actual implementation, the shape, quantity, and proportion of each component can be arbitrarily changed, and the component layout may be more complex. The structures, proportions, and sizes shown in the accompanying drawings are only for illustrative purposes to aid those skilled in the art and are not intended to limit the implementation conditions of the present invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effects and objectives of the present invention, should still fall within the scope of the technical content disclosed in the present invention. Furthermore, terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are only for clarity of description and are not intended to limit the scope of the present invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the present invention.

[0033] Figure 1 This is a schematic diagram of the pilot-operated control valve in the closed state, according to some embodiments of this application. Figure 2 This is a schematic diagram of the pilot-operated control valve in the open state, according to some embodiments of this application. Figure 1 , Figure 2 As shown, some embodiments of this application provide a pilot-operated regulating valve, including a valve body 1, a sleeve 2, a valve plug 3, a pressure plate 4, and a connecting plate 5. The sleeve 2 is disposed within the valve body 1, and the valve plug 3, pressure plate 4, and connecting plate 5 are disposed within the sleeve 2. The valve body 1, sleeve 2, valve plug 3, pressure plate 4, and connecting plate 5 form a first cavity 6. The valve body 1 has a medium inlet 11 and a medium outlet 12.

[0034] It should be noted that the first cavity 6 is a hollow cavity located above the valve plug 3, consisting of the valve body 1, sleeve 2, valve plug 3, pressure plate 4, and connecting plate 5, and is used to contain the medium.

[0035] Figure 3 As shown in some embodiments of this application Figure 1 An enlarged schematic diagram of the structure of A in the middle. (See attached diagram.) Figure 3As can be seen, in some embodiments, a throttling orifice 21 is provided on the side wall of the sleeve 2, through which the medium enters the sleeve 2 from the medium inlet 11 of the valve body 1. The valve plug 3 is located inside the sleeve 2 and is provided with a first medium channel 31, which communicates with the throttling orifice 21. The pressure plate 4 is connected to the valve plug 3 by screws, and a receiving cavity is formed between the pressure plate 4 and the valve plug 3. A second medium channel 41 is provided in the middle of the pressure plate 4. The connecting plate 5 is located in the receiving cavity and is connected to the driving member. The driving member drives the connecting plate 5 to fit or separate from the pressure plate 4. When the connecting plate 5 separates from the pressure plate 4, a third medium channel 42 is formed, through which the first medium channel 31 and the second medium channel 41 communicate.

[0036] This configuration allows the medium to enter the first chamber 6 sequentially through the throttle orifice 21, the first medium channel 31, the third medium channel 42, and the second medium channel 41. At this time, the valve core 7 is in the closed state, and the medium entering the first chamber 6 cannot flow out from the medium outlet 12 of the valve body 1. This causes the pressure in the first chamber 6 to increase rapidly, generating a downward thrust on the valve plug 3, thus solving the problem that the medium in the first chamber 6 cannot quickly form back pressure on the valve plug 3.

[0037] For example, in order to enable the medium entering the first cavity 6 to quickly form back pressure on the valve plug 3, one or more throttling orifices 21 are evenly distributed along the axial direction of the sleeve 2, such as 1, 2, 3, etc., and one or more throttling orifices 21 are evenly distributed along the circumference of the sleeve 2, such as 1, 2, 3, etc.

[0038] For example, in order to enable the medium entering the first cavity 6 to quickly form back pressure on the valve plug 3, one or more first medium channels 31 are provided, such as 1, 2, 3, etc., and the first medium channels 31 are evenly distributed along the circumference of the valve plug 3.

[0039] Figure 4 This is a schematic structural diagram of a valve plug according to some embodiments of this application. For example... Figure 4 As can be seen, in some embodiments, the outer wall of the valve plug 3 is provided with a first groove 32 along its circumference, the first groove 32 corresponding to the throttling orifice 21, so that the medium enters the first groove 32 through the throttling orifice 21.

[0040] It should be noted that a second cavity 8 is formed between the first groove 32 and the sleeve 2.

[0041] In some embodiments, the first medium passage 31 of the valve plug 3 is located within the first groove 32. When the valve core 7 is in the closed state, the medium entering the second chamber 8 quickly enters the first chamber 6 through the first medium passage 31. The medium rapidly generates back pressure on the valve plug 3, exerting a downward thrust on the valve plug 3. Secondly, the medium in the first chamber 6 also exerts a downward thrust on the valve core 7, and the auxiliary drive keeps the valve core 7 in the closed state, ensuring that the control valve of this application achieves Class V or Class VI leakage when the valve is closed. Simultaneously, the back pressure generated by the medium on the valve plug 3 reduces the configuration of the drive, thus reducing the cost of the control valve of this application.

[0042] In some embodiments, a gap is provided between the valve plug 3 and the sleeve 2, which reduces the contact area between the valve plug 3 and the sleeve 2 and solves the problem that the valve plug 3 and the sleeve 2 do not match due to inconsistent thermal deformation under high temperature steam conditions, which causes the regulating valve of this application to jam.

[0043] In some embodiments, a second groove 33 is provided on the outer wall of the valve plug 3 near the pressure plate 4, and a metal sealing ring 34 is provided in the second groove 33. The metal sealing ring 34 and the sleeve 2 cannot be completely without gap, so that the medium can enter the first cavity 6 through the gap between the metal sealing ring 34 and the sleeve 2, so that the medium in the first cavity 6 generates back pressure on the valve plug 3.

[0044] In some embodiments, the valve plug 3 is provided with a first sealing chamfer 35 at one end away from the pressure plate 4, and the sleeve 2 is provided with a second sealing chamfer 22 that cooperates with the first sealing chamfer 35.

[0045] Specifically, the medium entering the first cavity 6 generates back pressure on the valve plug 3, applying a downward thrust to the valve plug 3. This causes the first sealing chamfer 35 and the second sealing chamfer 22 to fit tightly together, preventing the medium from flowing out of the valve body 1 from the medium outlet 12 through the gap between the first sealing chamfer 35 and the second sealing chamfer 22. This arrangement facilitates auxiliary sealing of the regulating valve, reduces the need for drive components, and lowers costs.

[0046] When the driving component drives the valve core 7 to move the valve plug 3 upward, the first sealing chamfer 35 and the second sealing chamfer 22 separate. The medium flows out of the valve body 1 from the medium outlet 12 through the gap between the first sealing chamfer 35 and the second sealing chamfer 22. At this time, only a small amount of medium enters the first cavity 6 through the gap between the metal sealing ring 34 and the sleeve 2, which is conducive to the rapid depressurization of the first cavity 6 and avoids the valve core 7 from oscillating during the opening process, thus affecting the valve's precise regulation of the medium flow.

[0047] In some embodiments, a fourth medium channel 36 is provided in the middle of the valve plug 3, and a first step section 37 and a second step section 38 are provided on the inner wall of the fourth medium channel 36. The second step section 38 is located below the first step section 37, wherein the receiving cavity is located inside the first step section 37.

[0048] In some embodiments, the connecting plate 5 is embedded in the first step section 37, and the pressure plate 4 is pressed onto the first step section 37.

[0049] For example, the connecting plate 5 moves up and down in the first step 37 under the drive of the driving component, and is attached to or separated from the pressure plate 4.

[0050] In some embodiments, the pressure plate 4 is provided with an anti-rotation component 43, the pressure plate 4 and the connecting plate 5 are connected by the anti-rotation component 43, and the connecting plate 5 moves up and down along the axis of the anti-rotation component 43, fitting or separating from the pressure plate 4.

[0051] In some embodiments, the connecting disk 5 is provided with a fifth medium channel 51, which communicates with the second step section 38, and an elastic element 9 is provided in the second step section 38.

[0052] Specifically, when the valve core 7 is in the closed state, the medium enters the second step section 38 through the fifth medium channel 51, which increases the pressure in the second step section 38 and applies pressure to the elastic element 9. The reaction force generated after the elastic element 9 is compressed applies a downward thrust to the valve plug 3, thereby making the first sealing chamfer 35 and the second sealing chamfer 22 fit tightly together, providing auxiliary sealing for the regulating valve. This helps to reduce the configuration of driving components and lower costs.

[0053] It should be noted that the elastic element 9 is sleeved at the front end of the valve core 7.

[0054] For example, the elastic element 9 can be a disc spring.

[0055] In some embodiments, a notch 52 is provided on the circumferential sidewall of the end of the connecting plate 5 near the pressure plate 4, and the notch 52 is connected to the end face of the connecting plate 5 near the pressure plate 4. During the process of the connecting plate 5 and the pressure plate 4 separating and fitting together, the notch 52 always forms a passage with the first medium channel 31, ensuring that medium always enters the first cavity 6 through the first medium channel 31 before the connecting plate 5 and the pressure plate 4 are fitted together, so as to meet the requirement that the regulating valve of this application has enough medium for flow regulation during the flow regulation process.

[0056] Figure 5 This is a schematic structural diagram of a valve core according to some embodiments of this application. For example... Figure 5As can be seen, in some embodiments, the connecting disc 5 is sleeved on the valve core 7, and the connecting disc 5 and the valve core 7 are fastened together by screws and then connected as one piece by welding, so that the connecting disc 5 moves synchronously with the valve core 7.

[0057] In some embodiments, the rear end of the valve core 7 passes through the second medium channel 41 and the first cavity 6 and is connected to a driving member. The driving member drives the front end of the valve core 7 to close or separate from the fourth medium channel 36 of the valve plug 3. When the front end of the valve core 7 separates from the fourth medium channel 36, the medium flows out of the valve body 1 from the medium outlet 12 through the fourth medium channel 38.

[0058] For example, when the valve core 7 is completely separated from the fourth medium channel 38, the connecting plate 5 and the pressure plate 4 are tightly fitted. At this time, the medium in the first cavity 6 flows out of the valve body 1 from the medium outlet 12 through the fourth medium channel 36, realizing rapid pressure relief of the first cavity 6, so that the valve core 7 will not oscillate during the opening process, thus affecting the valve's precise regulation of the medium flow.

[0059] When the driving component drives the valve core 7 to continue moving upward, the connecting plate 5 drives the pressure plate 4 to move upward. Since the pressure plate 4 and the valve plug 3 are connected by screws, the pressure plate 4 drives the valve plug 3 to move upward, causing the first sealing chamfer 35 to separate from the second sealing chamfer 22. This results in the diversion hole 21 communicating with the medium outlet 12 of the valve body 1. The medium flows out of the valve body 1 from the medium outlet 12 of the valve body 1 through the gap between the first sealing chamfer 35 and the second sealing chamfer 22 from the diversion hole 21.

[0060] By adjusting the upward position of the valve core 7, the number of flow dividers 21 connected to the medium outlet 12 is changed, thereby adjusting the flow rate at the large opening.

[0061] In summary, the pilot-operated regulating valve provided by this invention features a throttling orifice on the sleeve, a first medium channel on the valve plug, a second medium channel on the pressure plate, and a third medium channel formed by a connecting plate separated from the pressure plate. The throttling orifice, the first medium channel, the second medium channel, and the third medium channel are interconnected, allowing the medium to flow sequentially through the throttling orifice, the first medium channel, the third medium channel, and the second medium channel into the first cavity quickly. This solves the problem that the medium in the first cavity cannot quickly generate back pressure on the valve plug. The structure is simple and the modification cost is low.

[0062] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A pilot-operated control valve, characterized in that: The valve includes a valve body, a sleeve disposed within the valve body, and a valve plug, a pressure plate, and a connecting plate disposed within the sleeve. The valve body, sleeve, valve plug, pressure plate, and connecting plate form a first cavity. The valve body has a medium inlet and a medium outlet. The sleeve is provided with a throttling orifice on its side wall, through which the medium enters the sleeve from the medium inlet of the valve body; The valve plug is provided with a first medium channel communicating with the throttling orifice; The pressure plate is connected to the valve plug, and a receiving cavity is formed between the pressure plate and the valve plug. The pressure plate is provided with a second medium channel communicating with the first cavity. The connecting plate is located within the accommodating cavity and connected to the driving component, and is either in contact with or separates from the pressure plate under the action of the driving component; when the connecting plate separates from the pressure plate, a third medium channel is formed, which is connected to the first medium channel and the second medium channel respectively, and the medium enters the first cavity sequentially through the first medium channel, the third medium channel and the second medium channel; a notch is provided on the circumferential side wall of the connecting plate near the pressure plate, and the notch forms a passage with the first medium channel before the connecting plate and the pressure plate are closed.

2. The pilot-operated regulating valve according to claim 1, characterized in that: The valve plug is also provided with a fourth medium channel. The inner wall of the fourth medium channel is provided with a first step and a second step. The second step is located below the first step. The connecting plate is embedded in the first step, and the pressure plate is pressed on the first step.

3. The pilot-operated regulating valve according to claim 1 or 2, characterized in that: The pressure plate is provided with an anti-rotation component, and the pressure plate and the connecting plate are connected through the anti-rotation component. The connecting plate moves along the axis of the anti-rotation component to fit or separate from the pressure plate.

4. The pilot-operated regulating valve according to claim 2, characterized in that: It also includes a valve core, and the connecting disc is sleeved on the valve core, and the connecting disc moves synchronously with the valve core.

5. The pilot-operated regulating valve according to claim 4, characterized in that: The rear end of the valve core passes through the second medium channel and the first cavity and is connected to the driving member. The driving member drives the front end of the valve core to close or separate from the fourth medium channel. When the front end of the valve core separates from the fourth medium channel, the medium flows out of the valve body from the medium outlet of the valve body through the fourth medium channel.

6. The pilot-operated regulating valve according to claim 4, characterized in that: The connecting plate is provided with a fifth medium channel, which is connected to the second step section. An elastic element is provided in the second step section, and the elastic element is sleeved on the front end of the valve core.

7. The pilot-operated regulating valve according to claim 1, characterized in that: The valve plug has a first sealing chamfer at the end opposite to the pressure plate, and the inner wall of the sleeve has a second sealing chamfer that mates with the first sealing chamfer. When the first sealing chamfer and the second sealing chamfer are separated, the medium flows out of the valve body from the medium outlet through the gap between the first sealing chamfer and the second sealing chamfer.

8. The pilot-operated regulating valve according to claim 1, characterized in that: The outer wall of the valve plug is provided with a first groove along its circumference, and the first groove corresponds to the throttling orifice.

9. The pilot-operated regulating valve according to claim 1, characterized in that: A second groove is provided on the outer wall of the valve plug near the pressure plate, and a metal sealing ring is provided in the second groove.

Images