Self-operated regulating valve and differential pressure control system

Abstract

The application discloses a self-operated regulating valve and a differential pressure control system. The self-operated regulating valve comprises a regulating valve shell, a valve core assembly and a pipeline piece. The inner cavity of the regulating valve shell is provided with a low-pressure fluid chamber and a high-pressure fluid chamber. The peripheral side of the regulating valve shell is provided with a low-pressure fluid inlet corresponding to the low-pressure fluid chamber. The end side of the regulating valve shell is provided with a feedback regulating inlet corresponding to the low-pressure fluid chamber. The peripheral side of the regulating valve shell is provided with a high-pressure fluid inlet and a high-pressure fluid outlet corresponding to the high-pressure fluid chamber. The valve core assembly comprises a valve core body and an elastic compression piece. The stem part of the valve core body is arranged in the low-pressure fluid chamber and the high-pressure fluid chamber. The end cover part of the valve core body is arranged at the end of the stem part arranged in the low-pressure fluid chamber. The elastic compression piece is sleeved on the stem part and elastically compressed in the low-pressure fluid chamber. The pipeline piece is used for connecting the high-pressure fluid outlet and the feedback regulating inlet. The self-operated regulating valve realizes the control of the pressure difference through a mechanical structure and has higher reliability.

Description

Technical Field

[0001] This invention belongs to the field of process control equipment technology, specifically relating to a self-regulating valve and a differential pressure control system. Background Technology

[0002] Differential pressure control is a common control objective in process control. For example, the discharge pressure of the compressor lubricating oil should be 0.1–0.2 MPa higher than the pressure inside the crankcase for the compressor to operate normally; the circulating coolant pressure of the axial flow pump motor needs to be 1.2–1.6 MPa higher than the pump outlet pressure to ensure that the pumped medium does not enter the motor rotor cavity. To maintain a constant pressure difference between the two fluids, pressure sensors are needed to detect the pressure values ​​of the two fluids in real time and transmit the measured values ​​to the controller. The controller compares the given pressure difference with the real-time pressure difference and drives the motor to adjust the opening of the fluid valve, changing the fluid flow rate and thus regulating the fluid pressure to achieve a constant pressure difference between the two fluids. This electrical control scheme requires the installation of a large number of electronic sensors, controllers, and power supplies, resulting in a complex control system structure and a high susceptibility to failure due to the numerous instruments and equipment used. Furthermore, since most of the equipment used is electronic, the power supply and signal transmission processes are easily affected by external interference, leading to poor system robustness. Summary of the Invention

[0003] To address the aforementioned defects or shortcomings, this invention provides a self-operated regulating valve and differential pressure control system, aiming to solve the technical problems of existing regulating valves relying on electronic components for control, being easily affected by interference, and having a high equipment failure rate.

[0004] To achieve the above objectives, the present invention provides a self-operated regulating valve, wherein the self-operated regulating valve includes a regulating valve body, a valve core assembly, and a pipeline component; the inner cavity of the regulating valve body is provided with a low-pressure fluid chamber and a high-pressure fluid chamber in sequence along a straight line, a low-pressure fluid inlet is opened on the periphery of the regulating valve body corresponding to the low-pressure fluid chamber, a feedback regulating inlet is opened on the end side of the regulating valve body corresponding to the low-pressure fluid chamber, and a high-pressure fluid inlet and a high-pressure fluid outlet are spaced apart on the periphery of the regulating valve body corresponding to the high-pressure fluid chamber; the valve core assembly includes a valve core body and an elastic compression component, the valve core body includes an end cap and a stem body, the two ends of the stem body are respectively located in the low-pressure fluid chamber and the high-pressure fluid chamber, the end cap is located at the end of the stem body located in the low-pressure fluid chamber, and the elastic compression component is sleeved on the stem body and elastically compressed in the low-pressure fluid chamber; the pipeline component is used to connect the high-pressure fluid outlet and the feedback regulating inlet.

[0005] In this embodiment of the invention, the self-regulating valve further includes a valve seat assembly, which includes a valve core centering sleeve and a valve seat body. The valve core centering sleeve and the valve seat body are disposed in a high-pressure fluid chamber and are arranged sequentially along the direction from the low-pressure fluid chamber toward the high-pressure fluid chamber. The valve core centering sleeve forms a rod-through channel, through which the rod body can be movably inserted and sealed close to the low-pressure fluid chamber. At the end of the valve core centering sleeve away from the low-pressure fluid chamber, a first inlet channel is formed that communicates with the rod-through channel. The high-pressure fluid inlet is connected to the first inlet channel. The valve seat body has a second inlet channel for the rod body to extend into. The high-pressure fluid outlet is provided and connected to the end of the second inlet channel away from the valve core centering sleeve.

[0006] In this embodiment of the invention, the rod body includes a main body section and a necked section. The main body section and the necked section are arranged sequentially along the direction from the low-pressure fluid chamber to the high-pressure fluid chamber. The radial cross-sectional dimension of the main body section is larger than that of the necked section, and the main body section can be sealed and assembled with the valve seat body.

[0007] In this embodiment of the invention, the rod-through channel includes a first rod-through section and a second rod-through section. The first rod-through section and the second rod-through section are arranged sequentially along the direction from the low-pressure fluid chamber toward the high-pressure fluid chamber. The radial cross-sectional dimension of the second rod-through section is larger than that of the first rod-through section. The first liquid inlet channel is connected to the second rod-through section.

[0008] In this embodiment of the invention, the valve core straightening sleeve includes a first straightening section, a second straightening section and a third straightening section arranged in sequence. The first straightening section and the third straightening section abut against the side wall of the high-pressure fluid chamber. The second straightening section forms a first liquid inlet channel, and the second straightening section and the side wall of the high-pressure fluid chamber are spaced apart to form a first circumferential flow channel.

[0009] In this embodiment of the invention, the valve seat body includes a first seat and a second seat. The first seat and the second seat are arranged sequentially along the direction from the low-pressure fluid chamber toward the high-pressure fluid chamber, forming a second liquid inlet channel. The first seat abuts against the side wall of the high-pressure fluid chamber, and the second seat forms a second circumferential flow channel at a distance from the side wall of the high-pressure fluid chamber. The second circumferential flow channel communicates with the high-pressure fluid outlet, and a through hole is formed on the second seat that communicates with the second circumferential flow channel and the second liquid inlet channel.

[0010] In this embodiment of the invention, the valve seat assembly further includes a valve seat plug, which is disposed in the high-pressure fluid chamber and abuts against the valve seat body end-to-end. A protrusion is formed on the valve seat plug, which extends into the second liquid inlet channel.

[0011] In this embodiment of the invention, the valve seat assembly further includes a positioning sleeve, which is threadedly connected to the side wall of the high-pressure fluid chamber and is used to press the valve core centering sleeve onto the valve seat body.

[0012] In this embodiment of the invention, a limiting part is formed on the side wall of the low-pressure fluid chamber. The limiting part is located between the low-pressure fluid inlet and the end cap of the valve core and is used to limit the maximum movement distance of the valve core.

[0013] To achieve the above objectives, the present invention also provides a differential pressure control system, wherein the differential pressure control system includes the above-mentioned self-regulating valve.

[0014] Through the above technical solutions, the self-regulating valve and differential pressure control system provided in the embodiments of the present invention have the following beneficial effects:

[0015] When using the self-regulating valve described above, low-pressure fluid enters the low-pressure fluid chamber through the low-pressure fluid inlet, while high-pressure fluid flows through the high-pressure fluid chamber through the high-pressure fluid inlet and exits through the high-pressure fluid outlet. A portion of the high-pressure fluid enters the feedback regulating inlet through the piping components, applying a pressure towards the high-pressure fluid chamber to the end cap of the valve core. Under normal operating conditions, the pressure of the high-pressure fluid on the end cap is equal to the sum of the pressures of the low-pressure fluid and the elastic compression component on the end cap. The pressure difference between the high-pressure and low-pressure fluids remains at a preset value. When the pressure difference between the high-pressure and low-pressure fluids increases, the pressure of the high-pressure fluid on the end cap becomes greater than the pressure of the low-pressure fluid and the elastic compression component. The combined pressure of the compression components on the end cap causes the high-pressure fluid to push the valve core to move, reducing the fluid area between the high-pressure fluid inlet and outlet and increasing resistance. Since the pressure at the high-pressure fluid inlet remains constant, the pressure at the high-pressure fluid outlet gradually decreases until the pressure on both sides of the end cap is balanced, restoring the pressure difference between the high-pressure and low-pressure fluids to a preset value. If the pressure difference between the high-pressure and low-pressure fluids decreases, the valve core moves in the opposite direction until the pressure difference returns to the preset value. Thus, this self-operated regulating valve achieves control of the pressure difference between the two fluids through a mechanical structure, offering higher reliability compared to existing electrically controlled valve assemblies.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to illustrate the invention and form part of the specification. They are used together with the following detailed description to explain the invention, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the overall structure of a self-operated regulating valve according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the liquid inlet channel of a high-pressure fluid chamber according to an embodiment of the present invention;

[0020] Figure 3This is a schematic diagram of the internal structure of a high-pressure fluid chamber according to an embodiment of the present invention;

[0021] Figure 4 This is another structural schematic diagram of a self-regulating valve according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures

[0023] 1. Control valve body; 11. Low-pressure fluid chamber

[0024] 12 High-pressure fluid chamber 13 Feedback regulation inlet

[0025] 14 High-pressure fluid inlet 15 High-pressure fluid outlet

[0026] 16 Low-pressure fluid inlet 17 Limiting part

[0027] 21 Valve core body 211 End cap portion

[0028] 212 Shaft section 213 Neck section

[0029] 214 Main body section 3 Valve seat assembly

[0030] 31 Valve core straightening sleeve 311 First straightening section

[0031] 312 Second Correction Section 313 Third Correction Section

[0032] 315 Second through-rod section 316 First circumferential flow channel

[0033] 317 First inlet channel 32 Valve seat body

[0034] 321 First seat body 322 Second seat body

[0035] 323 Second inlet channel; 324 Second circumferential flow channel

[0036] 325 through hole 33 valve seat plug

[0037] 331 Protrusion 34 Positioning sleeve

[0038] 4 Connecting plug 51 First sealing ring

[0039] 52 Second sealing ring 53 Third sealing ring

[0040] 54 Fourth sealing ring 55 Fifth sealing ring

[0041] 56 Sixth sealing ring 57 Seventh sealing ring Detailed Implementation

[0042] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0043] The self-regulating valve of the present invention will now be described with reference to the accompanying drawings.

[0044] like Figures 1 to 4 As shown, the present invention provides a self-regulating valve, wherein the self-regulating valve includes:

[0045] The regulating valve housing 1 has a low-pressure fluid chamber 11 and a high-pressure fluid chamber 12 arranged sequentially along a straight line in its inner cavity. A low-pressure fluid inlet 16 is provided on the periphery of the regulating valve housing 1 corresponding to the low-pressure fluid chamber 11, and a feedback regulation inlet 13 is provided on the end side of the regulating valve housing 1 corresponding to the low-pressure fluid chamber 11. A high-pressure fluid inlet 14 and a high-pressure fluid outlet 15 are provided at intervals on the periphery of the regulating valve housing 1 corresponding to the high-pressure fluid chamber 12.

[0046] The valve core assembly includes a valve core body 21 and an elastic compression member. The valve core body 21 includes an end cap portion 211 and a rod portion 212. The two ends of the rod portion 212 are respectively disposed in a low-pressure fluid chamber 11 and a high-pressure fluid chamber 12. The end cap portion 211 is disposed on the end of the rod portion 212 and is placed at the end of the low-pressure fluid chamber 11. The elastic compression member is sleeved on the rod portion 212 and elastically compressed in the low-pressure fluid chamber 11.

[0047] Piping fittings for connecting the high-pressure fluid outlet 15 and the feedback regulation inlet 13.

[0048] When using the self-regulating valve described above, low-pressure fluid enters the low-pressure fluid chamber 11 from the low-pressure fluid inlet 16, and high-pressure fluid flows from the high-pressure fluid inlet 14 through the high-pressure fluid chamber 12 and then out from the high-pressure fluid outlet 15. A portion of the high-pressure fluid enters the feedback regulating inlet 13 through the piping components, applying a pressure to the end cap 211 of the valve core 21, moving towards the high-pressure fluid chamber 12. Under normal operating conditions, the pressure of the high-pressure fluid on the end cap 211 is equal to the sum of the pressures of the low-pressure fluid and the elastic compression component on the end cap 211. The pressure difference between the high-pressure fluid and the low-pressure fluid is maintained at a preset value. When the pressure difference between the high-pressure fluid and the low-pressure fluid increases, the pressure of the high-pressure fluid on the end cap 211 becomes greater than that of the low-pressure fluid. The combined pressure of the high-pressure fluid and the elastic compression member on the end cap 211 causes the high-pressure fluid to push the valve core 21 to move, reducing the fluid area between the high-pressure fluid inlet 14 and the high-pressure fluid outlet 15 and increasing the resistance. Since the pressure at the high-pressure fluid inlet 14 remains constant, the pressure at the high-pressure fluid outlet 15 gradually decreases until the pressure on both sides of the end cap 211 is balanced, restoring the pressure difference between the high-pressure fluid and the low-pressure fluid to a preset value. If the pressure difference between the high-pressure fluid and the low-pressure fluid decreases, the valve core 21 moves in the opposite direction until the pressure difference returns to the preset value. Thus, this self-operated regulating valve achieves control of the pressure difference between the two fluids through a mechanical structure, which has higher reliability compared to existing electrically controlled valve assemblies.

[0049] It is understandable that when the pressure of the low-pressure fluid increases or decreases, the valve core 21 will also move, so that the pressure of the high-pressure fluid outlet 15 increases or decreases. The specific adjustment process is the same as the adjustment process for the change of high-pressure fluid, and will not be described again here.

[0050] In this embodiment of the invention, the self-regulating valve further includes a valve seat assembly 3, which includes a valve core straightening sleeve 31 and a valve seat body 32. The valve core straightening sleeve 31 and the valve seat body 32 are disposed in the high-pressure fluid chamber 12 and are arranged sequentially along the direction from the low-pressure fluid chamber 11 toward the high-pressure fluid chamber 12. The valve core straightening sleeve 31 forms a rod passage, through which the rod body 212 can be movably inserted and sealed close to the part near the low-pressure fluid chamber 11. At the end of the valve core straightening sleeve 31 away from the low-pressure fluid chamber 11, a first liquid inlet channel 317 is formed that communicates with the rod passage. The high-pressure fluid inlet 14 is connected to the first liquid inlet channel 317. The valve seat body 32 has a second liquid inlet channel 323 for the rod body 212 to extend into. The high-pressure fluid outlet 15 is disposed and connected to the end of the second liquid inlet channel 323 away from the valve core straightening sleeve 31.

[0051] The valve seat assembly 3 is used to construct a flow channel in the high-pressure fluid chamber 12. Compared with the scheme of directly constructing the flow channel through the regulating valve body 1, the valve seat assembly 3 can be disassembled and replaced, which is convenient for maintenance. Moreover, the valve seat assembly 3 can be designed separately according to different usage environments, while using the same regulating valve body 1, thereby reducing production costs. The valve core straightening sleeve 31 is used to support the end of the rod body 212 away from the end cap 211, ensuring the stability of the movement of the valve core body 21. The high-pressure fluid inlet 14 and the high-pressure fluid outlet 15 are offset from the valve seat body 32. By moving the valve core body 21, the fluid area from the first inlet channel 317 to the second inlet channel 323 can be adjusted, thereby realizing feedback regulation of the pressure of the high-pressure fluid outlet 15.

[0052] Specifically, the high-pressure fluid flows sequentially through the high-pressure fluid inlet 14, the first inlet channel 317, the rod channel, the second inlet channel 323, and the high-pressure fluid outlet 15. When the pressure difference between the high-pressure fluid and the low-pressure fluid increases, the valve core 21 moves toward the side where the high-pressure fluid chamber 12 is located, and the rod 212 extends into the second inlet channel 323. The fluid area from the first inlet channel 317 to the second inlet channel 323 decreases, and the pressure at the high-pressure fluid outlet 15 gradually decreases until the pressure difference returns to the preset value. When the pressure difference between the high-pressure fluid and the low-pressure fluid decreases, the valve core 21 moves toward the side where the low-pressure fluid chamber 11 is located, and the rod 212 extends into the second inlet channel 323. The fluid area from the first inlet channel 317 to the second inlet channel 323 increases, and the pressure at the high-pressure fluid outlet 15 gradually increases until the pressure difference returns to the preset value.

[0053] In this embodiment of the invention, the rod body 212 includes a main body section 214 and a constricted section 213. The main body section 214 and the constricted section 213 are arranged sequentially along the direction from the low-pressure fluid chamber 11 toward the high-pressure fluid chamber 12. The radial cross-sectional dimension of the main body section 214 is larger than that of the constricted section 213, and the main body section 214 can be sealed and assembled with the valve seat body 32. By setting the main body section 214 and the constricted section 213, the inlet channel can be completely closed to cut off the high-pressure fluid. Thus, when the pressure at the high-pressure fluid outlet 15 is high, the pressure difference between the high-pressure fluid and the low-pressure fluid can be quickly restored to a preset value.

[0054] Specifically, the radius of the main body section 214 is larger than the radius of the constricted section 213. Therefore, a stepped surface is formed between the main body section 214 and the constricted section 213. The stepped surface faces the valve seat body 32 and forms liquid inlets at intervals. The first liquid inlet channel 317 and the second liquid inlet channel 323 are connected through the liquid inlets. When the valve core 21 moves and the stepped surface moves closer to the valve seat body 32, the area of ​​the liquid inlet decreases and the resistance of the high-pressure fluid increases. When the valve core 21 moves and the stepped surface moves away from the valve seat body 32, the area of ​​the liquid inlet increases and the resistance of the high-pressure fluid decreases.

[0055] Furthermore, the inclined step surface can avoid stress concentration on the one hand; on the other hand, the step surface can guide the rod body 212 as it extends into the second liquid inlet channel 323, so that the main body 214 can smoothly enter the second liquid inlet channel 323, avoiding the main body 214 from directly colliding with the valve seat body 32 due to the inclination of the valve core 21.

[0056] In this embodiment of the invention, the rod-through channel includes a first rod-through section and a second rod-through section 315. The first rod-through section and the second rod-through section 315 are arranged sequentially along the direction from the low-pressure fluid chamber 11 toward the high-pressure fluid chamber 12. The radial cross-sectional dimension of the second rod-through section 315 is larger than that of the first rod-through section. The first liquid inlet channel 317 is connected to the second rod-through section 315. The side wall of the first rod-through section directly abuts against the main body section 214 of the valve core 21 to achieve a seal on the high-pressure fluid chamber 12, preventing high-pressure fluid from entering the low-pressure fluid chamber 11 through the rod-through channel and ensuring the normal operation of the self-regulating valve. The side wall of the second rod-through section 315 and the rod body 212 are spaced apart to form an annular flow channel so that the staggered first liquid inlet channel 317 and the second liquid inlet channel 323 can be connected.

[0057] In this embodiment of the invention, the valve core straightening sleeve 31 includes a first straightening section 311, a second straightening section 312, and a third straightening section 313 arranged sequentially. The first straightening section 311 and the third straightening section 313 abut against the side wall of the high-pressure fluid chamber 12. The second straightening section 312 forms a first liquid inlet channel 317, and a first circumferential flow channel 316 is formed between the second straightening section 312 and the side wall of the high-pressure fluid chamber 12. The first straightening section 311 and the third straightening section 313 abut against the side wall of the high-pressure fluid chamber 12 to form a support point and a sealing structure. The second straightening section 312 is used to construct the first circumferential flow channel 316. The high-pressure fluid first enters the first circumferential flow channel 316 from the high-pressure fluid inlet 14, and then enters the first liquid inlet channel 317. It is understandable that the self-operated regulating valve requires the valve seat assembly 3 and the regulating valve housing 1 to be assembled. The main body of the valve seat assembly 3 and the regulating valve housing 1 generally adopts a cylindrical structure. The inner cavity of the regulating valve housing 1 is a closed environment. Therefore, during the assembly process, it is difficult to ensure that the first liquid inlet channel 317 can be aligned with the high-pressure fluid inlet 14. The first circumferential flow channel 316 can ensure that the first liquid inlet channel 317 is always in communication with the high-pressure fluid inlet 14, reducing the assembly difficulty.

[0058] In this embodiment of the invention, the valve seat body 32 includes a first seat 321 and a second seat 322. The first seat 321 and the second seat 322 are arranged sequentially along the direction from the low-pressure fluid chamber 11 toward the high-pressure fluid chamber 12, forming a second inlet channel 323. The first seat 321 abuts against the side wall of the high-pressure fluid chamber 12, and the second seat 322 forms a second circumferential flow channel 324 at a distance from the side wall of the high-pressure fluid chamber 12. The second circumferential flow channel 324 connects to the high-pressure fluid outlet 15. A through hole 325 is formed on the second seat 322, connecting the second circumferential flow channel 324 and the second inlet channel 323. The first seat 321 abuts against the side wall of the high-pressure fluid chamber 12 to form a support point and a sealing structure; the second seat 322 is used to construct the second circumferential flow channel 324. The high-pressure fluid in the second inlet channel 323 enters the second circumferential flow channel 324 through the through hole 325 and then flows out from the high-pressure fluid outlet 15. The second circumferential flow channel 324 can ensure that the second liquid inlet channel 323 is always connected to the high-pressure fluid outlet 15, which can also reduce the difficulty of assembly.

[0059] In this embodiment of the invention, the valve seat assembly 3 further includes a valve seat plug 33, which is disposed within the high-pressure fluid chamber 12 and abuts against the valve seat body 32 at one end. A protrusion 331 is formed on the valve seat plug 33, extending into the second inlet channel 323. The valve seat plug 33 is used to seal the high-pressure fluid chamber 12, and the protrusion 331 on the valve seat plug 33 can adjust the resistance. See also... Figure 2 The protrusion 331 extends into the second liquid inlet channel 323, which serves a positioning function during assembly. On the other hand, the protrusion 331 reduces the radial cross-sectional area of ​​the second liquid inlet channel 323 on the side near the through hole 325, increasing the resistance to the high-pressure fluid. By setting the size of the protrusion 331, the resistance to the high-pressure fluid can be adjusted. In actual use, different models of valve seat plugs 33 can be selected according to the required pressure of the high-pressure fluid outlet 15 to set the outlet pressure. Each model of valve assembly plug has a main body of the same size and a protrusion 331 of different sizes.

[0060] Specifically, the valve seat plug 33 has a mounting hole on the side facing away from the valve seat body 32. The mounting hole is used to cooperate with the corresponding installation tool. For example, the valve seat plug 33 is threaded to the regulating valve body 1, the mounting hole is an internal hexagonal hole, and the installation tool is a hexagonal wrench.

[0061] In this embodiment of the invention, the valve seat assembly 3 further includes a positioning sleeve 34, which is threadedly connected to the side wall of the high-pressure fluid chamber 12 and is used to press the valve core centering sleeve 31 onto the valve seat body 32. By screwing the positioning sleeve 34, the pressure on the valve core centering sleeve 31 can be adjusted; and since the position of the positioning sleeve 34 is adjustable, it can compensate for manufacturing errors in the axial direction of the valve seat assembly 3 and the regulating valve housing 1 itself.

[0062] In this embodiment of the invention, a limiting part 17 is formed on the side wall of the low-pressure fluid chamber 11. The limiting part 17 is located between the low-pressure fluid inlet 16 and the end cap 211 of the valve core 21, and is used to limit the maximum movement distance of the valve core 21 to prevent the displacement of the valve core 21 from being too large, causing the valve core 21 to collide with the valve seat end cap.

[0063] In this embodiment of the invention, a connecting plug 4 is provided in the feedback adjustment inlet 13. The connecting plug 4 is used to connect the pipeline components and restrict the movement of the valve core 21 to prevent the valve core 21 from coming out of the low-pressure fluid chamber 11.

[0064] like Figure 4 As shown, in this embodiment of the invention, the self-regulating valve also includes a sealing ring assembly, which includes seven sealing rings; the first sealing ring 51 on the valve seat plug 33 is used to prevent high-pressure fluid leakage; the second sealing ring 52 on the valve seat body 32 is used to prevent high-pressure fluid from entering the second circumferential flow channel 324 when the main body section 214 extends into the second inlet channel 323; the third sealing ring 53 on the valve core straightening sleeve 31 is used to prevent high-pressure fluid from entering the low-pressure fluid chamber 11; the fourth sealing ring 54 and the fifth sealing ring 55 on the main body section 214 of the valve core body 21 are redundantly designed to prevent high-pressure fluid from entering the low-pressure fluid chamber 11; the sixth sealing ring 56 on the end cap 211 of the valve core body 21 is used to prevent low-pressure fluid from entering the feedback regulation inlet 13; and the seventh sealing ring 57 on the connecting plug 4 is used to prevent high-pressure fluid from overflowing the feedback regulation inlet 13.

[0065] To achieve the above objectives, the present invention also provides a differential pressure control system, wherein the differential pressure control system includes the above-mentioned self-regulating valve. Since the differential pressure control system adopts all the technical solutions of the above embodiments, it has at least the above-mentioned beneficial effects. The differential pressure control system adopts a purely mechanical regulating valve, which has reliable structure, low failure rate, and no electronic equipment installed on the process pipeline in the field, thus eliminating the need for explosion-proof design. It is particularly suitable for flammable and explosive process industries, such as oil refineries and chemical plants.

[0066] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0067] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0068] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-operated regulating valve, characterized in that, The self-operated regulating valve includes: The regulating valve housing (1) has a low-pressure fluid chamber (11) and a high-pressure fluid chamber (12) arranged sequentially along a straight line in its inner cavity. A low-pressure fluid inlet (16) is opened on the periphery of the regulating valve housing (1) corresponding to the low-pressure fluid chamber (11). A feedback regulation inlet (13) is opened on the end side of the regulating valve housing (1) corresponding to the low-pressure fluid chamber (11). A high-pressure fluid inlet (14) and a high-pressure fluid outlet (15) are opened at intervals on the periphery of the regulating valve housing (1) corresponding to the high-pressure fluid chamber (12). The valve core assembly includes a valve core body (21) and an elastic compression member. The valve core body (21) includes an end cap (211) and a rod body (212). The two ends of the rod body (212) are respectively disposed in the low-pressure fluid chamber (11) and the high-pressure fluid chamber (12). The end cap (211) is disposed at the end of the rod body (212) placed in the low-pressure fluid chamber (11). The elastic compression member is sleeved on the rod body (212) and elastically compressed in the low-pressure fluid chamber (11). Piping fittings for connecting the high-pressure fluid outlet (15) and the feedback regulation inlet (13). The self-regulating valve also includes a valve seat assembly (3), which includes a valve core straightening sleeve (31) and a valve seat body (32). The valve core straightening sleeve (31) and the valve seat body (32) are disposed in the high-pressure fluid chamber (12) and arranged sequentially along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12). The valve core straightening sleeve (31) forms a rod passage, which allows the rod body (212) to be movably inserted and close to the low-pressure fluid chamber (11). The valve core centering sleeve (31) is partially sealed and fitted. The end of the valve core centering sleeve (31) away from the low-pressure fluid chamber (11) forms a first liquid inlet channel (317) that communicates with the rod passage. The high-pressure fluid inlet (14) is connected to the first liquid inlet channel (317). The valve seat body (32) is provided with a second liquid inlet channel (323) for the rod body (212) to extend into. The high-pressure fluid outlet (15) is provided and connected to the end of the second liquid inlet channel (323) away from the valve core centering sleeve (31). The valve core straightening sleeve (31) includes a first straightening section (311), a second straightening section (312) and a third straightening section (313) arranged in sequence. The first straightening section (311) and the third straightening section (313) abut against the side wall of the high-pressure fluid chamber (12). The second straightening section (312) forms the first liquid inlet channel (317), and the second straightening section (312) and the side wall of the high-pressure fluid chamber (12) are spaced apart to form a first circumferential flow channel (316).

2. The self-operated regulating valve according to claim 1, characterized in that, The rod body (212) includes a main body section (214) and a constricted section (213). The main body section (214) and the constricted section (213) are arranged sequentially along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12). The radial cross-sectional dimension of the main body section (214) is larger than that of the constricted section (213), and the main body section (214) can be sealed and assembled with the valve seat body (32).

3. The self-operated regulating valve according to claim 1, characterized in that, The rod-through channel includes a first rod-through section and a second rod-through section (315). The first rod-through section and the second rod-through section (315) are arranged sequentially along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12). The radial cross-sectional dimension of the second rod-through section (315) is larger than that of the first rod-through section. The first liquid inlet channel (317) is connected to the second rod-through section (315).

4. The self-operated regulating valve according to claim 1, characterized in that, The valve seat body (32) includes a first seat (321) and a second seat (322). The first seat (321) and the second seat (322) are arranged sequentially along the direction from the low-pressure fluid chamber (11) toward the high-pressure fluid chamber (12) and form a second liquid inlet channel (323). The first seat (321) abuts against the side wall of the high-pressure fluid chamber (12). The second seat (322) and the side wall of the high-pressure fluid chamber (12) are spaced apart to form a second circumferential flow channel (324). The second circumferential flow channel (324) is connected to the high-pressure fluid outlet (15). A through hole (325) is formed on the second seat (322) to connect the second circumferential flow channel (324) and the second liquid inlet channel (323).

5. The self-operated regulating valve according to claim 1, characterized in that, The valve seat assembly (3) further includes a valve seat plug (33), which is located in the high-pressure fluid chamber (12) and abuts against the valve seat body (32) end-to-end. A protrusion (331) is formed on the valve seat plug (33), which extends into the second liquid inlet channel (323).

6. The self-operated regulating valve according to claim 1, characterized in that, The valve seat assembly (3) further includes a positioning sleeve (34), which is threaded to the side wall of the high-pressure fluid chamber (12) and is used to press the valve core straightening sleeve (31) onto the valve seat body (32).

7. The self-operated regulating valve according to any one of claims 1 to 6, characterized in that, A limiting part (17) is formed on the side wall of the low-pressure fluid chamber (11). The limiting part (17) is located between the low-pressure fluid inlet (16) and the end cap (211) of the valve core (21) and is used to limit the maximum movement distance of the valve core (21).

8. A differential pressure control system, characterized in that, The differential pressure control system includes a self-regulating valve according to any one of claims 1 to 7.

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