Opening control valve with blow-off protection and emergency shut-off

Abstract

The present application relates to valve body technical field, propose a kind of opening degree regulating valve with leakage protection and emergency shutdown, including main valve body, drive unit and valve core assembly, main valve body includes the valve cavity with water inlet end and water outlet end, valve core assembly is arranged in valve cavity, also include check valve core, valve core assembly and check valve core are sequentially arranged in valve cavity, intermediate cavity between valve core assembly and check valve core, valve core assembly is connected with drive unit, drive unit controls valve core assembly, check valve core is unidirectionally opened along the direction of water inlet end to water outlet end, valve core assembly includes valve rod, valve plug and pressure lock pin unit, valve plug is lockable with valve rod, valve plug and valve rod have vertical direction movement freedom when unlocking state, also include anti-backflow reversing valve and leakage protection valve, anti-backflow reversing valve makes valve plug and valve rod lock or unlock according to the pressure of water inlet end and water outlet end. Solve the problem that opening degree regulating valve in the prior art anti-backflow response is not timely and reliability is difficult to maintain long-term.

Description

Technical Field

[0001] This invention relates to the field of valve body technology, specifically to an opening regulating valve with leakage protection and emergency shut-off. Background Technology

[0002] The opening control valve can keep the inlet and outlet of the valve body stable by adjusting the valve opening.

[0003] Despite significant advancements in control valve technology, several challenges remain in practical applications. For instance, traditional control valves often fail to close promptly when responding to large-scale downstream leaks, leading to substantial water waste. Furthermore, they lack reliable backflow prevention when downstream pressure rises, particularly in cases of potential downstream contamination. While some valves incorporate emergency shut-off features, their reliability diminishes with use due to deteriorating sealing. Therefore, a valve body capable of addressing these issues is urgently needed. Summary of the Invention

[0004] This invention proposes an opening regulating valve with leakage protection and emergency shutdown, which solves the problems of untimely anti-backflow response and difficulty in maintaining long-term reliability of the opening regulating valve in the prior art.

[0005] The technical solution of the present invention is as follows:

[0006] A regulating valve with leakage protection and emergency shut-off includes a main valve body, a drive unit, and a valve core assembly. The main valve body includes a valve cavity with an inlet and an outlet. The valve core assembly is disposed within the valve cavity. The regulating valve also includes a check valve core. The valve core assembly and the check valve core are sequentially disposed within the valve cavity, with an intermediate cavity between them. The valve core assembly is connected to the drive unit, which controls the valve core assembly to open or close. The valve chamber is described above. The check valve core opens unidirectionally from the inlet end to the outlet end. The valve core assembly includes a valve stem, a valve plug, and a pressure locking pin unit. The valve plug is lockably connected to the valve stem by means of the pressure locking pin unit. When the valve plug is unlocked from the valve stem, it has a degree of freedom to move vertically. The opening regulating valve also includes an anti-backflow reversing valve and a leakage protection valve. The anti-backflow reversing valve selectively locks or unlocks the valve plug from the valve stem according to the pressure at the inlet end and the outlet end.

[0007] When the valve plug is locked to the valve stem, the opening regulating valve is in the opening regulating state; when the valve plug is unlocked from the valve stem, the opening regulating valve is in the emergency shut-off state.

[0008] When the opening regulating valve is in the emergency shut-off state, the leakage protection valve selectively puts the intermediate chamber into a differential pressure protection state or a leakage protection state according to the pressure difference between the intermediate chamber and the inlet end.

[0009] The anti-backflow reversing valve includes an anti-backflow port one, an anti-backflow port two, an anti-backflow port three, and a vent port. The anti-backflow port one is connected to the water inlet, and the anti-backflow port three is connected to the water outlet. A first channel is provided inside the valve stem, and a second channel is provided on the main valve body. The pressure sensing end of the pressure locking pin unit is located in the first channel. When the pressure value of the anti-backflow port one is greater than that of the anti-backflow port three, the first channel, the second channel, the anti-backflow port two, and the vent port are connected in sequence, so that the pressure locking pin unit is in a locked state. When the pressure value of the anti-backflow port one is less than that of the anti-backflow port three, the first channel, the second channel, the anti-backflow port two, the anti-backflow port three, and the water outlet are connected in sequence, so that the pressure locking pin unit is in an unlocked state.

[0010] The pressure locking pin unit includes a first locking pin, a first spring, a second locking pin, and a second spring. The first locking pin is disposed on the valve stem, and the first spring is sleeved on the first locking pin. The first spring causes the first locking pin to tend to move toward the first channel. The second locking pin is disposed on the valve plug, and the second spring is sleeved on the second locking pin. The second spring causes the second locking pin to tend to move toward the first locking pin.

[0011] The drain protection valve includes a connection port one, a connection port two, a connection port three, and a drain port. The drain protection valve includes a drain valve body, a drain valve core, and a drain spring. The connection port one is connected to the water inlet end. The connection ports two and three are both connected to the intermediate cavity. The connection ports one and three act on the two ends of the drain valve core, respectively. The drain spring is located at the end of the drain valve core near the connection port two. The drain valve core can move according to the pressure difference between the two ends to selectively connect the connection port two and the drain port.

[0012] The relief protection valve also includes an adjusting bolt, which is disposed on the relief valve housing, and the portion of the adjusting bolt located inside the relief valve housing abuts against the relief spring.

[0013] The check valve core includes a check bracket, a check spring, a check rod, and a check plate. The check bracket is disposed within the valve cavity. The check rod is movably disposed on the check bracket. The check plate is disposed on the check rod near the outlet end. The check spring is sleeved on the check rod, and the check spring causes the check rod to tend to move towards the outlet end. The movement of the check rod causes the check plate to open or close the valve cavity.

[0014] The anti-backflow reversing valve includes a reversing valve body, a reversing spring, and a reversing valve core. The reversing spring is located on the side of the reversing valve core near the first anti-backflow port. The reversing spring causes the reversing valve core to tend to move toward the third anti-backflow port. The reversing valve core moves within the reversing valve body to switch the connection state.

[0015] The working principle and beneficial effects of this invention are as follows:

[0016] This invention discloses an opening regulating valve with leakage protection and emergency shutdown. By installing an anti-backflow reversing valve and an overflow protection valve on the main valve body, the opening regulating valve, after opening, can adjust the connection state of each component to keep the entire valve body in an opening regulating state. Adjusting the opening controls the inlet and outlet water ends to the required operating state. When the outlet water pressure suddenly increases, possibly accompanied by water contamination, the check valve core closes in reverse, and the connection state of each component is adjusted, causing the valve core assembly to close urgently. At this time, the reliability of the anti-backflow design is improved through two anti-backflow mechanisms. Furthermore, considering the weakening of the check valve core's sealing performance, the intermediate cavity also has the function of leakage protection valve to allow leakage in the intermediate cavity. Therefore, even if the check valve core's sealing performance weakens, the intermediate cavity can still leak, providing further anti-backflow protection. Based on the above solution, the problems of untimely anti-backflow response and difficulty in maintaining long-term reliability in existing opening regulating valves can be solved. Attached Figure Description

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of the opening regulating valve in the present invention in its initial state when it is a shut-off valve embodiment;

[0019] Figure 2 This is a schematic diagram of the structure of the valve in the present invention when the valve is a shut-off valve and is in a pressure-reducing dynamic adjustment state;

[0020] Figure 3 This is a schematic diagram of the structure of the valve in the present invention when it is in the closed and venting state as a shut-off valve embodiment;

[0021] Figure 4This is a schematic diagram of the structure of an embodiment of the opening regulating valve in this invention when it is a gate valve;

[0022] In the diagram: 1. Main valve body, 2. Drive unit, 3. Inlet, 4. Outlet, 5. Valve chamber, 6. Check valve core, 7. Intermediate chamber, 8. Valve stem, 9. Valve plug, 10. Anti-backflow directional valve, 11. Drainage protection valve, 12. Anti-backflow port one, 13. Anti-backflow port two, 14. Anti-backflow port three, 15. Vent port, 16. First channel, 17. Second channel, 18. First locking pin, 19. 20. Second locking pin, 21. Second spring, 22. Connection port one, 23. Connection port two, 24. Connection port three, 25. Drain port, 26. Drain valve body, 27. Drain valve core, 28. Drain spring, 29. Adjusting bolt, 30. Check bracket, 31. Check spring, 32. Check rod, 33. Check plate, 34. Reversing valve body, 35. Reversing spring, 36. Reversing valve core. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] like Figures 1-4 As shown in the figure, this embodiment proposes an opening regulating valve with leakage protection and emergency shutdown. The opening regulating valve includes a main valve body 1, a drive unit 2, and a valve core assembly. The main valve body 1 includes a valve cavity 5 with an inlet end 3 and an outlet end 4. The valve core assembly is disposed in the valve cavity 5. The opening regulating valve also includes a check valve core 6. The valve core assembly and the check valve core 6 are sequentially disposed in the valve cavity 5, with an intermediate cavity 7 between the valve core assembly and the check valve core 6. The valve core assembly is connected to the drive unit 2, and the drive unit 2 controls the valve core assembly to open or close. When the valve chamber 5 is closed, the check valve core 6 opens unidirectionally from the inlet end 3 to the outlet end 4. The valve core assembly includes a valve stem 8, a valve plug 9, and a pressure locking pin unit. The valve plug 9 is lockably connected to the valve stem 8 by means of the pressure locking pin unit. When the valve plug 9 is unlocked from the valve stem 8, it has the freedom to move vertically. The opening adjustment valve also includes an anti-backflow reversing valve 10 and a leakage protection valve 11. The anti-backflow reversing valve 10 selectively locks or unlocks the valve plug 9 from the valve stem 8 according to the pressure of the inlet end 3 and the outlet end 4.

[0025] When the valve plug 9 is locked to the valve stem 8, the opening regulating valve is in the opening regulating state; when the valve plug 9 is unlocked from the valve stem 8, the opening regulating valve is in the emergency shut-off state.

[0026] When the opening regulating valve is in the emergency shut-off state, the leakage protection valve 11 selectively puts the intermediate chamber 7 into a differential pressure protection state or a leakage protection state according to the pressure difference between the intermediate chamber 7 and the water inlet 3.

[0027] In this embodiment, the proposed opening regulating valve with leakage protection and emergency shut-off has a structure consisting of a main valve body 1 with a valve cavity 5. The main valve body 1 has an inlet end 3 and an outlet end 4. A drive unit 2 is installed on the main valve body 1 to drive the valve core assembly located in the valve cavity 5. The valve plug 9 is connected to the valve stem 8 via a pressure locking pin unit. The anti-backflow reversing valve 10 can reverse the flow according to the pressure at the inlet end 3 and the outlet end 4, thereby allowing the pressure locking pin unit to lock or unlock the valve plug 9 and the valve stem 8 by sensing changes in pressure. When the pressure at the inlet end 3 is greater than the water pressure at the outlet end 4, the anti-backflow reversing valve 10 locks the pressure locking pin unit. At this time, the drive unit 2 can drive the valve stem 8 to move, thereby adjusting the opening of the valve plug 9. When the water pressure at the inlet end 3 is less than the water pressure at the outlet end 4, the pressure locking pin unit unlocks. At this time, the valve plug 9 can move vertically on the valve stem 8 under its own weight. At this time, the pressure at the outlet 4 increases, so the valve plug 9 will close instantly, thus achieving emergency shut-off. At the same time, the check valve core 6 also closes, thus sealing and isolating the intermediate cavity 7. Considering the decay of sealing reliability, if the check valve core 6 leaks, causing the pressure in the intermediate cavity 7 to rise, the intermediate cavity 7 will be protected by the relief protection valve 11. According to the pressure difference between the intermediate cavity 7 and the inlet 3, if the pressure difference between the intermediate cavity 7 and the inlet 3 reaches a certain threshold, the intermediate cavity 7 will directly vent. If the threshold is not reached, the pressure value of the intermediate cavity 7 will always be less than the pressure value of the inlet 3, that is, the medium in the intermediate cavity 7 will not flow back to the inlet 3 side. The above can achieve backflow prevention protection.

[0028] It should be noted that the opening regulating valve based on the technical concept of this application can be a gate valve or a stop valve, but this is not a limitation; setting multiple auxiliary valves to achieve the functions of opening regulation, emergency shutdown and backflow prevention, that is, adjusting the connection status of each auxiliary valve according to the pressure change at the inlet end 3 and the outlet end 4, if it is just a simple change in the valve body structure, quantity and connection method, should fall within the protection scope of this application.

[0029] The anti-backflow reversing valve 10 includes an anti-backflow port 12, an anti-backflow port 23, an anti-backflow port 34, and a vent port 15. The anti-backflow port 12 is connected to the inlet end 3, and the anti-backflow port 34 is connected to the outlet end 4. A first channel 16 is provided inside the valve stem 8, and a second channel 17 is provided on the main valve body 1. The pressure sensing end of the pressure locking pin unit is located in the first channel 16. When the pressure value of the anti-backflow port 12 is greater than that of the anti-backflow port 34, the first channel 16, the second channel 17, the anti-backflow port 23, and the vent port 15 are connected in sequence, so that the pressure locking pin unit is in a locked state. When the pressure value of the anti-backflow port 12 is less than that of the anti-backflow port 34, the first channel 16, the second channel 17, the anti-backflow port 23, the anti-backflow port 34, and the outlet end 4 are connected in sequence, so that the pressure locking pin unit is in an unlocked state.

[0030] In this embodiment, based on the technical concept of the above embodiment, specifically, the anti-backflow reversing valve 10 senses the pressure of the inlet end 3 through the anti-backflow port 12 and senses the pressure of the outlet end 4 through the anti-backflow port 34. The pressure at both ends causes a reversal, thereby changing the connection state. When the pressure at the inlet end 3 is higher than that at the outlet end 4, the vent port 15 of the anti-backflow reversing valve 10 connects to the anti-backflow port 23, which in turn connects to the second channel 17 on the main valve body 1 and the first channel 16 on the valve stem 8. Since the pressure sensing end of the pressure locking pin unit is vented, there is no pressure, and the pressure locking pin unit locks the valve plug 9 and the valve stem 8. At this time, the drive unit 2 can drive the valve stem 8 to control the opening of the valve plug 9. When the pressure at the outlet end 4 is higher, the anti-backflow reversing valve 10 changes position, so that the outlet end 4 connects to the second channel 17 and the first channel 16 through the anti-backflow port 34 and the anti-backflow port 23, and acts on the pressure locking pin unit to unlock it. At this time, the valve plug 9 falls and closes, realizing emergency shutdown.

[0031] It should be noted that a water distribution sleeve can be installed on the main valve body 1. The water distribution sleeve is located inside the main valve body 1, and its outer surface has grooves that form an outer annular channel with the main valve body 1. Multiple guiding channels are provided on the side wall, and the inner side also has an inner annular channel. The water distribution sleeve has a certain height, and when the valve stem 8 is adjusted up and down, the medium pressure in the second channel 17 can be connected to the first channel 16 through the outer annular channel, the guiding channels, and the inner annular channel. The drive unit 2 can be manual or electric, such as a handwheel or actuator.

[0032] The pressure locking pin unit includes a first locking pin 18, a first spring 19, a second locking pin 20, and a second spring 21. The first locking pin 18 is disposed on the valve stem 8, and the first spring 19 is sleeved on the first locking pin 18. The first spring 19 causes the first locking pin 18 to tend to move towards the first channel 16. The second locking pin 20 is disposed on the valve plug 9, and the second spring 21 is sleeved on the second locking pin 20. The second spring 21 causes the second locking pin 20 to tend to move towards the first locking pin 18.

[0033] In this embodiment, multiple pressure locking pin units can be set up and distributed circumferentially around the valve stem 8. Taking one set as an example, it is divided into two parts: a first spring 19 is sleeved on the first locking pin 18, and a second spring 21 is sleeved on the second locking pin 20. The first locking pin 18 and the second locking pin 20 are in corresponding positions, and under the action of the first spring 19 and the second spring 21, they both tend to move towards the center of the valve stem 8, i.e., the first channel 16. The direction of movement is radial to the valve stem 8. When there is no pressure in the first channel 16, the first spring 19 acts on the first locking pin 18 to make it move into the first channel 16. At this time, because the first locking pin 18 retracts, the second spring 21 acts on the second locking pin 20 to insert into the mounting hole of the first locking pin 18, that is, to lock the valve plug 9 on the valve stem 8. The valve plug 9 cannot rotate or displace relative to the valve stem 8.

[0034] The drain protection valve 11 includes a first connection port 22, a second connection port 23, a third connection port 24, and a drain port 25. The drain protection valve 11 includes a drain valve body 26, a drain valve core 27, and a drain spring 28. The first connection port 22 is connected to the water inlet 3. The second connection port 23 and the third connection port 24 are both connected to the intermediate cavity 7. The first connection port 22 and the third connection port 24 act on both ends of the drain valve core 27. The drain spring 28 is disposed at the end of the drain valve core 27 near the second connection port 23. The drain valve core 27 can move according to the pressure difference between the two ends to selectively connect the second connection port 23 and the drain port 25.

[0035] In this embodiment, the relief protection valve 11 provides pressure protection and relief protection for the intermediate cavity 7 by sensing the medium pressure at the inlet end 3 and the intermediate cavity 7. Specifically, the relief protection valve 11 senses the medium pressure at the inlet end 3 through connection port 1 22 and senses the medium pressure in the intermediate cavity 7 through connection port 3 24. The two ends of the relief valve core 27 sense the medium pressure at the inlet end 3 and the intermediate cavity 7, respectively. A relief spring 28 is also provided on the side near connection port 3 24. Therefore, the relief valve core 27 will only move when the medium pressure in the intermediate cavity 7 and the elastic force of the relief spring 28 are greater than the medium pressure at the inlet end 3. After the relief valve core 27 moves, the connection port 23 and the relief port 25 will then open. When the anti-backflow emergency shut-off port of the opening regulating valve is closed, the intermediate chamber 7 is sealed by the valve core assembly and the check valve core 6. When the combined force of the medium pressure in the intermediate chamber 7 and the elastic force of the relief spring 28 is still less than the medium pressure at the inlet end 3, the relief protection valve 11 keeps the pressure value in the intermediate chamber 7 at a lower protection value to prevent backflow to the inlet end 3 due to the decay of the sealing reliability of the valve core assembly. When the combined force of the medium pressure in the intermediate chamber 7 and the elastic force of the relief spring 28 is greater than the medium pressure at the inlet end 3, the relief valve core 27 moves, connecting the second connection port 23 and the relief port 25, and the intermediate chamber 7 leaks and reduces pressure until the relief valve core 27 moves back to its original position, and the second connection port 23 and the relief port 25 are disconnected, thereby protecting the intermediate chamber 7 from leakage.

[0036] The relief protection valve 11 also includes an adjusting bolt 29, which is disposed on the relief valve housing 26. The portion of the adjusting bolt 29 located inside the relief valve housing 26 abuts against the relief spring 28.

[0037] In this embodiment, an adjusting bolt 29 is provided on the relief protection valve 11. The compression of the relief spring 28 is adjusted by rotating the adjusting bolt 29 to the depth of screwing into the relief valve housing 26, thereby adjusting the operating pressure difference between the intermediate chamber 7 and the water inlet 3. The so-called operating pressure difference means that when it exceeds the operating pressure difference, the relief valve core 27 will perform a switching action.

[0038] The check valve core 6 includes a check bracket 30, a check spring 31, a check rod 32, and a check plate 33. The check bracket 30 is disposed inside the valve cavity 5. The check rod 32 is movably disposed on the check bracket 30. The check plate 33 is disposed on the check rod 32 near the outlet end 4. The check spring 31 is sleeved on the check rod 32. The check spring 31 causes the check rod 32 to tend to move towards the outlet end 4. The movement of the check rod 32 causes the check plate 33 to open or close the valve cavity 5.

[0039] In this embodiment, a check bracket 30 is provided in the valve cavity 5, and a check rod 32 passes through the middle of the check bracket 30. A check spring 31 is sleeved on the part of the check rod 32 that passes through the check bracket 30. When the check spring 31 is compressed, its elastic force causes the check rod 32 to tend to move towards the side closer to the water inlet end 3. The check plate 33 on the check rod 32 is on the side closer to the water outlet end 4. When the pressure changes from high to low along the direction from the water inlet end 3 to the water outlet end 4, the pressure of the medium acting on the check plate 33 overcomes the elastic force of the check spring 31, thus conducting. When the pressure at the water outlet end 4 increases, the check plate 33 closes under the action of the check spring 31, thus closing the valve cavity 5.

[0040] The anti-backflow reversing valve 10 includes a reversing valve housing 34, a reversing spring 35, and a reversing valve core 36. The reversing spring 35 is located on the side of the reversing valve core 36 near the anti-backflow port 12. The reversing spring 35 causes the reversing valve core 36 to tend to move toward the anti-backflow port 14. The reversing valve core 36 moves within the reversing valve housing 34 to switch the connection state.

[0041] In this embodiment, the anti-backflow reversing valve 10 adopts a structure in which a reversing spring 35 and a reversing valve core 36 are installed inside the reversing valve housing 34. The reversing spring 35 causes the reversing valve core 36 to initially approach the side of the anti-backflow port 314. It should be noted that the reversing valve core 36 can be moved by the medium pressure, spring force or external pressing force to adjust the connection state and realize different working states of the opening regulating valve.

[0042] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An open position control valve having a blow-off protection and an emergency shut-off, characterized in that The opening regulating valve includes a main valve body (1), a drive unit (2), and a valve core assembly. The main valve body (1) includes a valve cavity (5) with an inlet end (3) and an outlet end (4). The valve core assembly is disposed in the valve cavity (5). The opening regulating valve also includes a check valve core (6). The valve core assembly and the check valve core (6) are sequentially disposed in the valve cavity (5). An intermediate cavity (7) is formed between the valve core assembly and the check valve core (6). The valve core assembly is connected to the drive unit (2). The drive unit (2) controls the valve core assembly to open or close the valve cavity (5). The check valve core (6) The valve core assembly is unidirectionally open from the inlet end (3) to the outlet end (4). The valve core assembly includes a valve stem (8), a valve plug (9), and a pressure locking pin unit. The valve plug (9) is locked to the valve stem (8) by means of the pressure locking pin unit. When the valve plug (9) and the valve stem (8) are unlocked, the valve plug (9) has a degree of freedom to move in the vertical direction. The opening adjustment valve also includes an anti-backflow reversing valve (10) and a leakage protection valve (11). The anti-backflow reversing valve (10) selectively locks or unlocks the valve plug (9) and the valve stem (8) according to the pressure of the inlet end (3) and the outlet end (4). When the valve plug (9) is locked to the valve stem (8), the opening regulating valve is in the opening regulating state; when the valve plug (9) is unlocked to the valve stem (8), the opening regulating valve is in the emergency shut-off state. When the opening regulating valve is in the emergency shut-off state, the leakage protection valve (11) selectively puts the intermediate cavity (7) into the differential pressure protection state or the leakage protection state according to the pressure difference between the intermediate cavity (7) and the inlet end (3); The drain protection valve (11) includes a first connection port (22), a second connection port (23), a third connection port (24), and a drain port (25). The drain protection valve (11) includes a drain valve body (26), a drain valve core (27), and a drain spring (28). The first connection port (22) is connected to the inlet end (3). The second connection port (23) and the third connection port (24) are both connected to the intermediate cavity (7). The first connection port (22) and the third connection port (24) act on the two ends of the drain valve core (27). The drain spring (28) is located at the end of the drain valve core (27) near the second connection port (23). The drain valve core (27) can move according to the pressure difference between the two ends so that the second connection port (23) and the drain port (25) can be selectively connected.

2. The open positioner valve with blowdown protection and emergency shutdown of claim 1, wherein, The anti-backflow reversing valve (10) includes an anti-backflow port one (12), an anti-backflow port two (13), an anti-backflow port three (14), and a vent port (15). The anti-backflow port one (12) is connected to the inlet end (3), and the anti-backflow port three (14) is connected to the outlet end (4). A first channel (16) is provided inside the valve stem (8), and a second channel (17) is provided on the main valve body (1). The pressure sensing end of the pressure locking pin unit is located inside the first channel (16). The anti-backflow port one (12) is larger than the anti-backflow port three (14). When the pressure value of the backflow port three (14) is less than the pressure value of the backflow port three (14), the first channel (16), the second channel (17), the backflow prevention port two (13), and the vent port (15) are connected in sequence, so that the pressure lock pin unit is in a locked state; when the pressure value of the backflow prevention port one (12) is less than the pressure value of the backflow prevention port three (14), the first channel (16), the second channel (17), the backflow prevention port two (13), the backflow prevention port three (14), and the outlet end (4) are connected in sequence, so that the pressure lock pin unit is in an unlocked state.

3. The open positioner valve with blowdown protection and emergency shutdown of claim 2, wherein, The pressure locking pin unit includes a first locking pin (18), a first spring (19), a second locking pin (20), and a second spring (21). The first locking pin (18) is disposed on the valve stem (8), and the first spring (19) is sleeved on the first locking pin (18). The first spring (19) causes the first locking pin (18) to tend to move toward the first channel (16). The second locking pin (20) is disposed on the valve plug (9), and the second spring (21) is sleeved on the second locking pin (20). The second spring (21) causes the second locking pin (20) to tend to move toward the first locking pin (18).

4. The open positioner valve with blowdown protection and emergency shutdown of claim 3, wherein, The relief protection valve (11) also includes an adjusting bolt (29), which is disposed on the relief valve housing (26), and the portion of the adjusting bolt (29) located inside the relief valve housing (26) abuts against the relief spring (28).

5. The open positioner valve with blowdown protection and emergency shutdown of claim 4, wherein, The check valve core (6) includes a check bracket (30), a check spring (31), a check rod (32), and a check plate (33). The check bracket (30) is disposed in the valve cavity (5). The check rod (32) is movably disposed on the check bracket (30). The check plate (33) is disposed on the check rod (32) on the side near the outlet end (4). The check spring (31) is sleeved on the check rod (32). The check spring (31) causes the check rod (32) to have a tendency to move towards the outlet end (4). The movement of the check rod (32) causes the check plate (33) to open or close the valve cavity (5).

6. The open positioner valve with blowdown protection and emergency shutdown of claim 5, wherein, The anti-backflow reversing valve (10) includes a reversing valve housing (34), a reversing spring (35), and a reversing valve core (36). The reversing spring (35) is located on the side of the reversing valve core (36) close to the anti-backflow port one (12). The reversing spring (35) causes the reversing valve core (36) to tend to move toward the anti-backflow port three (14). The reversing valve core (36) moves within the reversing valve housing (34) to switch the connection state.

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