Fault closing type stop type pressure regulating valve

Abstract

The utility model belongs to the technical field of pressure regulating valves, and discloses a fault closing type cut-off pressure regulating valve which is characterized in that a valve seat is mounted in a valve body, a sealing gasket is circumferentially arranged at the top of the valve seat, a valve cover is circumferentially connected to the top of the valve body, a valve core is slidably inserted into an inner cavity of the valve cover, and the valve core slides up and down along the axis of the valve body to circumferentially abut against the sealing gasket or be separated from the sealing gasket. A balance hole is formed in a balance plate in the valve element, the balance plate divides the interior of the valve element into an upper cavity and a lower cavity, a first section formed by the balance plate and the upper cavity in a matched mode is the same as a second section formed by the lower end face of the balance plate and the lower cavity in a matched mode, one end of the valve rod penetrates through the valve deck and is connected to the balance plate, and the elastic piece is arranged on the valve rod in a sleeved mode and abuts against the position between the valve deck and the balance plate. The driving assembly drives the valve rod to drive the valve element to move upwards, when the valve is closed, pressure in the air inlet cavity enters the upper cavity through the balance hole, medium pressure acts on the first section and the second section at the same time, stress at the two ends of the valve element is balanced, the driving force requirement at the opening moment of the valve is lowered, and the control precision of the valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure regulating valves, in particular to a fail-close type cut-off pressure regulating valve. Background Art

[0002] A pressure regulating valve is a device used to control the pressure of a fluid (gas or liquid). It is very common in various industrial applications, such as oil and gas processing, chemical production, and home heating systems. The main function of a pressure regulating valve is to adjust the pressure of the input fluid to a predetermined output value and maintain this value.

[0003] At present, most pressure-regulating valves adopt a cut-off structure, in which the valve stem drives the valve core to move to open and close the valve. When the valve is closed, the valve core is under pressure due to the pressure of the medium in the valve, forming an unbalanced structure. The driving device needs to overcome the force of the medium on the valve core before it can drive the valve core to move, which increases the driving force requirements of the driving device. At the same time, the pressure fluctuation of the medium in the valve directly affects the force on the valve core, seriously affecting the control accuracy of the valve. Utility Model Content

[0004] The purpose of the utility model is to provide a fail-close type cut-off pressure regulating valve, which reduces the driving force requirement at the moment of valve opening and improves the control accuracy of the valve.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A fail-close type stop-type pressure regulating valve comprises a valve body, a valve seat, a valve core, a valve cover, a valve stem, an elastic member and a drive assembly, wherein an air inlet cavity and an air outlet cavity are respectively provided on both sides of the valve body, an installation cavity is provided on the upper part of the valve body, the cavity bottom of the installation cavity is connected to the air inlet cavity, and the side of the installation cavity is connected to the air outlet cavity, the valve seat is circumferentially connected to the cavity bottom of the installation cavity, a sealing gasket is circumferentially provided on the top of the valve seat, the valve cover is circumferentially connected to the cavity wall of the installation cavity, the bottom of the valve cover is spaced from the sealing gasket, the valve core is slidably inserted in the inner cavity of the valve cover, and the outer wall of the valve core is circumferentially abutted against the valve cover, the valve core The slidable valve body is slided up and down along the axis of the valve body to circumferentially abut against the sealing gasket or detach from the sealing gasket, a balancing plate is provided inside the valve core, a balancing hole is provided on the balancing plate, the balancing plate divides the interior of the valve core into an upper chamber and a lower chamber, a first cross-section formed by the cooperation of the balancing plate and the upper chamber is the same as a second cross-section formed by the cooperation of the balancing plate and the lower chamber, one end of the valve stem passes through the valve cover and is connected to the balancing plate, the elastic member is sleeved on the valve stem and abuts between the valve cover and the balancing plate, the driving assembly is configured to drive the valve stem to drive the valve core to move upward, connecting the air inlet chamber and the air outlet chamber.

[0007] Preferably, the drive assembly includes a cover body, which is connected to the valve cover. A non-connected drive chamber and a feedback chamber are provided inside the cover body. The other end of the valve stem is slidably provided in the drive chamber. When the pressure in the drive chamber reaches a preset value, the valve stem is driven to drive the valve core to move upward along the axis of the valve body, connecting the air inlet chamber and the air outlet chamber.

[0008] Preferably, the drive assembly also includes a diaphragm, the cover body includes an upper cover and a lower cover, the upper cover is buckled on the lower cover to form a cavity, the lower cover is connected to the valve cover, the outer ring of the diaphragm is circumferentially clamped between the upper cover and the lower cover, and the diaphragm separates the cavity into the drive cavity and the feedback cavity.

[0009] Preferably, the bottom of the lower cover is provided with a through hole connected to the drive chamber, the through hole is circumferentially connected to an annular ring, the annular ring extends away from the through hole, and its outer wall is circumferentially connected to the valve cover, and the other end of the valve stem extends into the drive chamber through the through hole.

[0010] Preferably, the diaphragm is in a circular ring shape, and the drive assembly further comprises an upper chuck and a lower chuck connected to each other, and the inner ring of the diaphragm is clamped between the upper chuck and the lower chuck.

[0011] Preferably, the drive assembly also includes a connecting unit, which includes a fixing member and a connecting member, one end of the fixing member is fixedly connected to the inner wall of the upper cover, the connecting member passes through and is connected to the upper chuck and the lower chuck, a sliding cavity is provided on the top of the connecting member, at least part of the fixing member is circumferentially inserted in the sliding cavity, the other end of the valve stem is connected to the bottom of the connecting member, and when the pressure in the drive cavity reaches a preset value, the connecting member is driven to move upward along the axis of the fixing member, driving the valve stem and the valve core to move upward, and the axis of the fixing member coincides with the axis of the valve body.

[0012] Preferably, the upper cover is provided with a feedback hole, the feedback hole is connected to the feedback chamber, the air outlet chamber is connected to the downstream pipeline, the downstream pipeline is connected to the feedback hole, the pressure in the feedback chamber gradually increases, and the valve core drives the valve stem to gradually move downward along the axis of the valve body under the action of the feedback chamber and the elastic member. When the pressure in the feedback chamber reaches a preset value, the bottom of the valve core circumferentially abuts against the sealing gasket.

[0013] Preferably, a commander assembly is further included, wherein a pressure-taking hole is provided on one side of the valve cover, the pressure-taking hole is connected to the inlet of the commander assembly, a drive hole is provided on the lower cover, the drive hole is connected to the drive cavity, and the outlet of the commander assembly is connected to the drive hole, and the commander assembly is configured to stabilize the medium pressure and deliver the preset value of the medium pressure to the drive hole.

[0014] Preferably, a filter assembly is further included, wherein the filter assembly is arranged between the valve cover and the commander assembly, the pressure taking hole is connected to the filter assembly, and the filter assembly filters impurities.

[0015] Preferably, a heater is further included, which is arranged between the filter assembly and the commander assembly. The gas from which impurities have been removed is heated by the heater and then passes into the air inlet of the commander assembly.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a fault-closed stop-type pressure-regulating valve, wherein an air inlet cavity and an air outlet cavity are respectively provided on both sides of the valve body, an installation cavity is provided on the upper part of the valve body, the cavity bottom of the installation cavity is connected to the air inlet cavity, and the side of the installation cavity is connected to the air outlet cavity, the valve seat is circumferentially connected to the cavity bottom of the installation cavity, a sealing gasket is circumferentially provided on the top of the valve seat, the valve cover is circumferentially connected to the cavity wall of the installation cavity, the bottom of the valve cover is spaced from the sealing gasket, the valve core is slidably inserted in the inner cavity of the valve cover, and the outer wall of the valve core circumferentially abuts the valve cover, the valve core slides up and down along the axis of the valve body to circumferentially abut the sealing gasket or separate from the sealing gasket, a balancing plate is provided inside the valve core, and a balancing hole is provided on the balancing plate. The balancing plate divides the interior of the valve core into an upper cavity and a lower cavity, and the upper end surface of the balancing plate and the upper cavity are matched. The first cross-section formed by the combination is the same as the second cross-section formed by the lower end surface of the balance plate and the lower cavity. One end of the valve stem passes through the valve cover and is connected to the balance plate. The elastic member is sleeved on the valve stem and abuts between the valve cover and the balance plate. The drive assembly is configured to drive the valve stem to drive the valve core to move upward, connecting the air inlet chamber and the air outlet chamber; when the valve is closed, the medium pressure in the air inlet chamber enters the upper cavity of the valve core through the balance hole and is blocked by the valve cover. The medium pressure acts on the first cross-section and the second cross-section at the same time. The forces at both ends of the valve core are balanced, and the whole is in a balanced state, which reduces the driving force requirements of the drive assembly at the moment of valve opening, and at the same time avoids the influence of the pressure fluctuation of the medium in the valve on the force of the valve core, thereby improving the control accuracy of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a cross-sectional view of a fail-close type cut-off pressure regulating valve provided by an embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional view of a partial structure of a fail-close type stop-type pressure regulating valve provided by an embodiment of the present utility model;

[0020] Figure 3 This is a cross-sectional view of the valve cover provided by an embodiment of the present utility model;

[0021] Figure 4 This is a cross-sectional view of the valve core provided by an embodiment of the present utility model;

[0022] Figure 5It is a cross-sectional view of a drive assembly provided in an embodiment of the present utility model.

[0023] In the picture:

[0024] 1. Valve body; 11. Air inlet chamber; 12. Air outlet chamber; 13. Installation chamber; 2. Valve seat; 3. Sealing gasket; 4. Valve core; 41. Balance plate; 411. Balance hole; 42. Upper chamber; 43. Lower chamber; 5. Valve cover; 51. Body; 52. First annular member; 53. Second annular member; 50. Pressure hole; 6. Valve stem; 7. Elastic member; 8. Drive assembly; 81. Cover; 811. Upper cover; 8111. Feedback hole; 812. Lower cover; 8121. Drive hole; 813. Annular ring; 82. Diaphragm; 83. Upper chuck; 84. Lower chuck; 85. Fixing member; 86. Connecting member; 801. Drive chamber; 802. Feedback chamber; 9. Commander assembly; a. Filter assembly; b. Heater. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0026] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0027] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0028] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0029] This embodiment provides a fail-safe shut-off pressure-regulating valve. When the valve is closed, the valve core is in a balanced state, which reduces the driving force requirement of the drive component at the moment the valve is opened. At the same time, it avoids the influence of pressure fluctuations of the medium in the valve on the force on the valve core, thereby improving the control accuracy of the valve.

[0030] See also Figure 1-Figure 5 A fail-close type stop-type pressure regulating valve includes a valve body 1, a valve seat 2, a valve core 4, a valve cover 5, a valve stem 6, an elastic member 7 and a drive assembly 8, wherein the valve body 1, the valve cover 5 and the drive assembly 8 cooperate to form an external contour, and the valve seat 2, the valve core 4, the valve stem 6 and the elastic member 7 are arranged inside. Specifically, the valve stem 6 is connected to the valve core 4. Under the action of the elastic member 7, the valve core 4 drives the valve stem 6 to be pressed down, and the valve is in a closed state. The drive assembly 8 is connected to the valve stem 6, and the drive assembly 8 outputs a driving force, driving the valve stem 6 to drive the valve core 4 to overcome the force of the elastic member 7 and move upward to open the valve.

[0031] See also Figure 2 An air inlet cavity 11 and an air outlet cavity 12 are respectively provided on both sides of the valve body 1. A mounting cavity 13 is provided on the upper portion of the valve body 1. The bottom of the mounting cavity 13 communicates with the air inlet cavity 11, and the side of the mounting cavity 13 communicates with the air outlet cavity 12. Furthermore, a valve seat 2 is mounted inside the valve body 1, and the bottom of the valve seat 2 is circumferentially connected to the bottom of the mounting cavity 13. Preferably, the valve seat 2 is bolted to the valve body 1.

[0032] Through the above-mentioned arrangement, the valve core 4 is arranged in the installation cavity 13. When the valve is closed, the bottom of the valve core 4 circumferentially abuts against the valve seat 2, and the side wall of the valve core 4 separates the installation cavity 13 and the air outlet cavity 12, thereby cutting off the communication between the air inlet cavity 11 and the air outlet cavity 12. When the valve is open, the bottom of the valve core 4 is separated from the valve seat 2, and the installation cavity 13 is connected to the air outlet cavity 12 through the gap, thereby connecting the air inlet cavity 11 and the air outlet cavity 12.

[0033] Preferably, a sealing gasket 3 is circumferentially provided on the top of the valve seat 2, and the bottom of the valve core 4 is circumferentially in contact with the sealing gasket 3 when the valve is closed, thereby improving the sealing performance and preventing air leakage.

[0034] Furthermore, the valve cover 5 is mounted on the top of the valve body 1. For details, please refer to Figure 3The valve cover 5 includes a main body 51 and a first annular member 52 and a second annular member 53 respectively provided at the bottom and top of the main body 51. The first annular member 52 extends into the installation cavity 13 and is circumferentially connected to the cavity wall of the installation cavity 13. Preferably, the first annular member 52 is bolted to the cavity wall of the installation cavity 13 of the valve body 1.

[0035] Furthermore, the valve core 4 is slidably inserted in the inner cavity of the valve cover 5, that is, the valve core 4 is slidably inserted in the inner cavity of the first ring-shaped member 52, and the outer wall of the valve core 4 circumferentially abuts against the inner cavity of the first ring-shaped member 52 to prevent leakage of the medium in the valve body 1. The valve core 4 can slide up and down along the axis of the valve body 1 to circumferentially abut against the sealing gasket 3 or detach from the sealing gasket 3. It should be noted that the bottom of the valve cover 5, that is, the bottom of the first ring-shaped member 52, is separated from the sealing gasket 3 to ensure that the valve cover 5 will not affect the circulation of the medium in the valve body 1 during the process of the valve sliding upward along the inner cavity of the first ring-shaped member 52.

[0036] Please refer to Figure 4. The valve core 4 has a cylindrical structure, and a balancing plate 41 is provided inside the valve core 4. The balancing plate 41 divides the interior of the valve core 4 into an upper chamber 42 and a lower chamber 43. When the valve is closed, the upper chamber 42 can communicate with the outside, and the lower chamber 43 communicates with the air inlet chamber 11. Furthermore, the upper end surface of the balancing plate 41 cooperates with the upper chamber 42 to form a first cross-section, and the lower end surface of the balancing plate 41 cooperates with the lower chamber 43 to form a second cross-section. The first cross-section and the second cross-section have the same shape and size. Furthermore, a balancing hole 411 is provided on the balancing plate 41, and the upper chamber 42 and the lower chamber 43 are connected through the balancing hole 411.

[0037] The valve core 4 structure provided in this embodiment is provided with a balance plate 41, a balance hole 411, and a first cross-section and a second cross-section of the same shape. When the valve is closed, the medium pressure in the air inlet chamber 11 enters the upper chamber 42 of the valve core 4 through the balance hole 411 and is blocked by the valve cover 5. The medium pressure acts on the first cross-section and the second cross-section at the same time. Since the first cross-section is the same as the second cross-section, the forces at both ends of the valve core 4 are balanced, there is no pressure difference, and the whole is in a balanced state, which reduces the driving force requirement for the drive component 8 at the moment of valve opening, and at the same time avoids the influence of the pressure fluctuation of the medium in the valve on the force of the valve core 4, thereby improving the control accuracy of the valve.

[0038] Specifically, one end of the valve stem 6 passes through the valve cover 5 and is fastened to the balance plate 41. The elastic member 7 is sleeved on the valve stem 6. When the valve is fully closed, the elastic member 7 is always in a compressed state to abut between the balance plate 41 and the valve cover 5, applying downward pressure to the balance plate 41 to ensure that the bottom of the valve core 4 is circumferentially abutted against the sealing gasket 3.

[0039] The above is a specific structure for realizing valve closing of a fault-closed stop-type pressure-regulating valve provided in this embodiment. When the valve is closed, the medium pressure in the air inlet chamber 11 enters the upper chamber 42 of the valve core 4 through the balancing hole 411 and is blocked by the valve cover 5. The medium pressure acts on the first section and the second section at the same time. The forces at both ends of the valve core 4 are balanced, and the whole is in a balanced state, which reduces the driving force requirement of the driving component 8 at the moment of valve opening, and avoids the influence of the pressure fluctuation of the medium in the valve on the force of the valve core 4, thereby improving the control accuracy of the valve.

[0040] The present embodiment provides a fail-closed stop-type pressure regulating valve that applies force to the valve stem 6 through the driving assembly 8 to drive the valve core 4 to move upward, thereby opening the valve.

[0041] Specifically, see Figure 1 、 Figure 4 and Figure 5 The drive assembly 8 includes a cover body 81, which includes an upper cover 811 and a lower cover 812 that snap together. The upper cover 811 and the lower cover 812 cooperate to form a cavity, and the lower cover 812 is connected to the valve cover 5. For example, a through hole is provided at the bottom of the lower cover 812, and an annular ring 813 is circumferentially connected to the through hole. The annular ring 813 extends outward away from the through hole, and the outer wall of the annular ring 813 is circumferentially connected to the inner wall of the valve cover 5. In other words, the outer wall of the annular ring 813 is circumferentially connected to the inner wall of the second annular member 53. Preferably, the upper cover 811 is bolted to the lower cover 812, which provides strong connection strength and a strong seal.

[0042] See also Figure 5 The drive assembly 8 also includes a diaphragm 82, an upper chuck 83 and a lower chuck 84. The upper chuck 83 is superimposed on the lower chuck 84 and is bolted to the lower chuck 84. The diaphragm 82 is annular, and the outer ring of the diaphragm 82 is circumferentially clamped between the upper cover 811 and the lower cover 812. The inner ring of the diaphragm 82 is clamped between the upper chuck 83 and the lower chuck 84, thereby dividing the cavity into a non-connected drive cavity 801 and a feedback cavity 802. It should be noted that the drive cavity 801 is formed by the diaphragm 82, the lower chuck 84 and the lower cover 812. The above-mentioned through hole connects the drive cavity 801, and the feedback cavity 802 is formed by the diaphragm 82, the upper chuck 83 and the upper cover 811.

[0043] See also Figure 1 and Figure 5 In this embodiment, the other end of the valve stem 6 extends into the drive chamber 801 through the through hole and can slide up and down along the axis of the valve body 1. When the pressure in the drive chamber 801 reaches a preset value, it can overcome the force of the elastic member 7, drive the valve stem 6 to drive the valve core 4 to move upward along the axis of the valve body 1, and then connect the air inlet chamber 11 and the air outlet chamber 12, switching to the valve open state.

[0044] This embodiment provides a structure for stabilizing the upper chuck 83 and the lower chuck 84 and enabling the valve stem 6 to move upward along the axis of the valve body 1 .

[0045] For example, the driving assembly 8 further includes a connecting unit, see Figure 1 and Figure 5 The connecting unit includes a fixing member 85 and a connecting member 86, wherein one end of the fixing member 85 is fixed to the inner wall of the upper cover 811, the axis of the fixing member 85 coincides with the axis of the valve body 1, the connecting member 86 passes through the upper chuck 83 and the lower chuck 84, and is connected to at least one of the upper chuck 83 and the lower chuck 84, a sliding cavity is provided at the top of the connecting member 86, the other end of the valve stem 6 is connected to the bottom of the connecting member 86, under the support of the valve stem 6, the lower chuck 84 is spaced from the lower cover 812, and at least part of the other end of the fixing member 85 is always circumferentially inserted in the sliding cavity.

[0046] Through the above-mentioned structural setting, when the pressure in the driving chamber 801 reaches the preset value, the pressure acting on the lower chuck 84 and the diaphragm 82 overcomes the force of the elastic member 7, pushing the lower chuck 84 upward, and the connecting member 86 moves upward along the axis of the fixing member 85. The part of the other end of the fixing member 85 inserted into the sliding chamber gradually expands, driving the valve and the valve core 4 to move upward.

[0047] Furthermore, the pressure of the driving chamber 801 comes from the interior of the valve core 4. For details, please refer to Figure 1 、 Figure 3 and Figure 5 A pressure-taking hole 50 is opened on one side of the valve cover 5 , and a driving hole 8121 is opened on the lower cover 812 . The driving hole 8121 is connected to the driving chamber 801 , and pressure is delivered to the driving chamber 801 through the pressure-taking hole 50 .

[0048] See also Figure 1 In order to ensure pressure stability, this embodiment is further provided with a pilot assembly 9. The pilot assembly 9 includes two pilots connected in series. The pressure-taking hole 50 is connected to the inlet of one of the pilots. After the medium pressure is stabilized, the medium is transported to the other pilot and further output to the drive chamber 801 through the drive hole 8121. The drive assembly 8 converts the stable medium pressure into a driving force, providing sufficient power for the valve to open even in a low-pressure environment.

[0049] Please continue reading Figure 1 In this embodiment, a filter assembly a is further provided. The filter assembly a is provided between the valve cover 5 and the controller assembly 9. The pressure taking hole 50 is connected to the filter assembly a, and the filter assembly a filters impurities. The filter assembly a includes two filters, and the two filters serve as backup for each other to provide redundant protection for medium cleaning.

[0050] Please continue reading Figure 1In this embodiment, a heater b is further provided, which is provided between the filter assembly a and the controller assembly 9. The medium after impurities are removed is heated by the heater b and then passed into the inlet of the controller assembly 9, ensuring that the medium temperature is higher than the dew point temperature to prevent the medium from freezing and forming ice blockage.

[0051] The fail-closed stop-type pressure regulating valve provided in this embodiment can also autonomously adjust the opening of the valve core 4 according to the pressure fluctuation in the downstream pipeline, thereby ensuring that the pressure in the downstream pipeline remains stable.

[0052] Specifically, the upper cover 811 defines a feedback hole 8111, which communicates with the feedback chamber 802. The outlet chamber 12 communicates with the downstream pipeline, which in turn communicates with the feedback hole 8111. When the valve is open, the medium flows into the downstream pipeline through the outlet chamber 12, gradually increasing the pressure in the downstream pipeline. The downstream pipeline pressure enters the feedback chamber 802 through the feedback hole 8111. The downstream pipeline pressure creates a force in the feedback chamber 802 that offsets the force in the drive chamber 801, preventing the force in the drive chamber 801 from completely overcoming the force of the elastic member 7. Under the force of the elastic member 7, the valve core 4 drives the valve stem 6 to gradually move downward along the axis of the valve body 1. The valve core 4 gradually moves downward, gradually reducing the valve opening. As the valve gradually closes, the force of the elastic member 7 plus the force of the feedback chamber 802 eventually balances the driving force of the drive chamber 801. In this balanced state, the valve core 4 moves slightly in response to fluctuations in the downstream pipeline pressure, controlling the valve opening and ensuring continuous and stable pressure in the downstream pipeline.

[0053] The fail-closed stop-type pressure regulating valve provided in this embodiment has the following advantages:

[0054] 1. Reduce the driving force requirement at the moment the valve is opened. Specifically, when the valve is closed, the medium pressure in the air inlet chamber 11 enters the upper chamber 42 of the valve core 4 through the balancing hole 411 and is blocked by the valve cover 5. The medium pressure acts on the first and second sections simultaneously, and the forces at both ends of the valve core 4 are balanced, resulting in an overall balanced state. The driving component 8 no longer needs to overcome the force of the medium pressure on the valve core 4, thereby reducing the driving force requirement at the moment the valve is opened.

[0055] 2. Improve control accuracy. Specifically, the forces on both ends of the valve core 4 are balanced, and the medium pressure fluctuation in the valve has no effect on the force on the valve core 4. The output force required by the drive component to drive the valve core to open is stable, thereby improving the control accuracy of the valve;

[0056] 3. The valve opening is adjustable. Specifically, when the valve is open, the medium flows into the downstream pipeline through the air outlet cavity 12, and the downstream pipeline pressure gradually increases. The downstream pipeline pressure enters the feedback cavity 802 through the feedback hole 8111. The force of the elastic member 7 plus the force of the feedback cavity 802 can form a balance with the driving force of the driving cavity 801. In this balanced state, the valve core 4 moves slightly with the fluctuation of the downstream pipeline pressure, thereby controlling the valve opening and ensuring that the pressure of the downstream pipeline is continuously stable.

[0057] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A fail-closed stop-type pressure regulating valve, characterized in that: The invention comprises a valve body (1), a valve seat (2), a valve core (4), a valve cover (5), a valve stem (6), an elastic member (7) and a drive assembly (8), wherein an air inlet cavity (11) and an air outlet cavity (12) are respectively provided on both sides of the valve body (1), an installation cavity (13) is provided on the upper part of the valve body (1), the bottom of the installation cavity (13) is connected to the air inlet cavity (11), and the side of the installation cavity (13) is connected to the air outlet cavity (12), and the valve The seat (2) is circumferentially connected to the bottom of the installation cavity (13), a sealing gasket (3) is circumferentially arranged on the top of the valve seat (2), the valve cover (5) is circumferentially connected to the cavity wall of the installation cavity (13), the bottom of the valve cover (5) is spaced from the sealing gasket (3), the valve core (4) is slidably inserted into the inner cavity of the valve cover (5), and the outer wall of the valve core (4) is circumferentially abutted against the valve cover (5), and the valve core (4) is arranged along the valve body ( The axis of the valve stem (6) slides up and down to circumferentially abut against the sealing gasket (3) or detach from the sealing gasket (3); a balancing plate (41) is provided inside the valve core (4); the balancing plate (41) is provided with a balancing hole (411); the balancing plate (41) divides the interior of the valve core (4) into an upper chamber (42) and a lower chamber (43); a first cross-section formed by the balancing plate (41) and the upper chamber (42) is the same as a second cross-section formed by the balancing plate (41) and the lower chamber (43); one end of the valve stem (6) passes through the valve cover (5) and is connected to the balancing plate (41); the elastic member (7) is sleeved on the valve stem (6) and abuts between the valve cover (5) and the balancing plate (41); the driving assembly (8) is configured to drive the valve stem (6) to drive the valve core (4) to move upward, thereby connecting the air inlet chamber (11) and the air outlet chamber (12).

2. A fail-closed stop-type pressure regulating valve according to claim 1, characterized in that: The driving assembly (8) includes a cover body (81), the cover body (81) is connected to the valve cover (5), and a non-connected driving chamber (801) and a feedback chamber (802) are provided inside the cover body (81). The other end of the valve stem (6) is slidably provided in the driving chamber (801). When the pressure of the driving chamber (801) reaches a preset value, the valve stem (6) is driven to drive the valve core (4) to move upward along the axis of the valve body (1), thereby connecting the air inlet chamber (11) and the air outlet chamber (12).

3. A fail-closed stop-type pressure regulating valve according to claim 2, characterized in that: The drive assembly (8) further includes a diaphragm (82), the cover body (81) includes an upper cover (811) and a lower cover (812), the upper cover (811) is fastened to the lower cover (812) to form a cavity, the lower cover (812) is connected to the valve cover (5), the outer ring of the diaphragm (82) is circumferentially clamped between the upper cover (811) and the lower cover (812), and the diaphragm (82) separates the cavity into the drive cavity (801) and the feedback cavity (802).

4. A fail-closed stop-type pressure regulating valve according to claim 3, characterized in that: The bottom of the lower cover (812) is provided with a through hole connected to the drive chamber (801), and the through hole is circumferentially connected to an annular ring (813), the annular ring (813) extends away from the through hole, and its outer wall is circumferentially connected to the valve cover (5), and the other end of the valve stem (6) extends into the drive chamber (801) through the through hole.

5. The fail-closed stop-type pressure regulating valve according to claim 3, characterized in that: The diaphragm (82) is annular, and the drive assembly (8) further comprises an upper chuck (83) and a lower chuck (84) connected thereto, wherein the inner ring of the diaphragm (82) is clamped between the upper chuck (83) and the lower chuck (84).

6. The fail-closed stop-type pressure regulating valve according to claim 5, characterized in that: The driving assembly (8) also includes a connecting unit, which includes a fixing member (85) and a connecting member (86). One end of the fixing member (85) is fixed to the inner wall of the upper cover (811), and the connecting member (86) passes through and is connected to the upper chuck (83) and the lower chuck (84). A sliding cavity is provided on the top of the connecting member (86), and at least part of the fixing member (85) is circumferentially inserted in the sliding cavity. The other end of the valve stem (6) is connected to the bottom of the connecting member (86). When the pressure of the driving cavity (801) reaches a preset value, the connecting member (86) is driven to move upward along the axis of the fixing member (85), driving the valve stem (6) and the valve core (4) to move upward. The axis of the fixing member (85) coincides with the axis of the valve body (1).

7. The fail-closed stop-type pressure regulating valve according to claim 3, characterized in that: The upper cover (811) is provided with a feedback hole (8111), the feedback hole (8111) is connected to the feedback chamber (802), the air outlet chamber (12) is connected to a downstream pipeline, and the downstream pipeline is connected to the feedback hole (8111). The pressure of the feedback chamber (802) gradually increases, and the valve core (4) drives the valve stem (6) to gradually move downward along the axis of the valve body (1) under the action of the feedback chamber (802) and the elastic member (7). When the pressure of the feedback chamber (802) reaches a preset value, the bottom of the valve core (4) circumferentially abuts against the sealing gasket (3).

8. The fail-closed stop-type pressure regulating valve according to claim 3, characterized in that: The invention also includes a controller assembly (9), a pressure-taking hole (50) is provided on one side of the valve cover (5), the pressure-taking hole (50) is connected to the inlet of the controller assembly (9), the lower cover (812) is provided with a drive hole (8121), the drive hole (8121) is connected to the drive chamber (801), the outlet of the controller assembly (9) is connected to the drive hole (8121), and the controller assembly (9) is configured to stabilize the medium pressure and deliver the medium pressure of the preset value to the drive hole (8121).

9. The fail-closed stop-type pressure regulating valve according to claim 8, characterized in that: It also includes a filter assembly (a), which is arranged between the valve cover (5) and the commander assembly (9), and the pressure-taking hole (50) is connected to the filter assembly (a), and the filter assembly (a) filters impurities.

10. The fail-closed stop-type pressure regulating valve according to claim 9, characterized in that: The invention also includes a heater (b), which is arranged between the filter assembly (a) and the controller assembly (9). The gas from which impurities have been removed is heated by the heater (b) and then passes into the air inlet of the controller assembly (9).

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